dokumen.tips_neptune-service-manual.pdf

NEPTUNE
ELECTRONIC VENTILATOR
TECHNICAL MANUAL
2nd
edition
January 2006
MEDEC BENELUX NV

All rights reserved. No part of this publication may be reproduced, stored in a
retrieval system or transmitted, in any form or by any means, electronically,
mechanically, by photocopying, recording or otherwise, without the prior written
permission of Medec Benelux NV.
Medec Benelux NV reserves the right to change specifications without prior
notification. Careful attention has been paid to the compilation of this publication.
Medec Benelux NV
Lion D’Orweg 19
9300 Aalst
Belgium
Telephone: (32) 53 / 70.35.44
Fax : (32) 53 / 70.35.33
Website : www.medecbenelux.be
E-mail : sales@medecbenelux.be
2nd
edition
January 2006

User responsibility
The equipment described in this manual has been built to confirm with the
specifications and instructions stated in this manual. To ensure proper and safe
operation of the equipment, it must be checked and serviced at least according to the
minimum standards laid out in this manual.
The equipment must be repaired and serviced only in accordance with written
instructions issued by Medec Benelux N.V. and must not be altered or modified in
any way without written approval of Medec Benelux N.V. The user of this equipment
shall have the responsibility for any malfunction which results from improper use,
maintenance, repair, damage or alteration by anyone other than Medec Benelux N.V.
or its appointed agents.
The Neptune anaesthesia combination has been specially developed for anaesthetic
applications.
The system is built around the so-called bag in bottle principle. This system has for
many years proved to be a reliable and safe system. One important aspect in this
connection is that the gas exchange of the patient is completely separated from the
machine by use of the bag mentioned.
Another important aspect is that the Neptune anaesthesia system, whatever
catastrophe might occur (compressed air, mains voltage failure or technical
problems), always goes into the spontaneous / manual respiration mode. This way, the
(manual) respiration of the patient is always guaranteed as long as the fresh gas
supply is assured.
The Neptune anaesthesia system may only be used in anaesthetic rooms which are
conducting and are provided with proper ventilation and electrical wiring.
The Neptune anaesthesia system may only be used in anaesthetic rooms conform with
EN60601-1-2 level. RS232 output (optional) may only be used with devices conform
with EN60601-1-2 level.

Table of Contents
1. Electronic system
1.1 Electronic system overview 1
1.2 Power supply
1.2.1 Replacing the AC mains fuses 5
1.2.2 Block diagram 5
1.2.3 Schematic diagram 8
1.2.4 Power supply board layout 11
1.3 Backplane board
1.3.3 Backplane board layout 16
1.4 MMI board
1.4.3 MMI board layout 25
1.4.4 Build-in test software 27
1.4.5 Graphics display 53
1.5 O2 measurement
1.5.1 General 54
1.5.2 Operation 54
1.5.3 O2 measurement specifications 55
1.6 Master board
1.6.3 Build-in test software 61
1.6.4 Master board layout 69
1.7 Pneumatic board
1.7.3 Built-in test software 77
1.7.4 Pneumatic board layout 85
2. Pneumatic system
2.1 Pneumatic diagram 86
2.2 Manual/Spontaneous mode (MAN) 88
2.3 Controlled mandatory ventilation (CMV) 90
2.4 Pressure controlled ventilation (PCV) 92
2.5 Peep 94
2.6 Flush safety 94
2.7 Mechanical construction
2.7.1 Patient breathing unit 95
2.7.2 Bottle 99
2.7.3 Supply tank 101
2.7.4 Solenoid valves 102

3. Maintenance and calibration
3.1 Visual inspection 103
3.2 Battery backup 104
3.3 The calibration menu 105
3.4 The pressure transducers 108
3.5 The pressure regulators 113
3.6 The flow regulators 116
3.7 O2 flush 118
3.8 The input pressure switches 119
3.9 The bottle safety valve 124
3.10 Peep valve calibration 125
3.11 Valve test 127
3.12 Performing a leaktest
3.12.1 Entering the leaktest menu 130
3.12.2 Performing the leaktest 132
3.12.3 Leaving the leaktest menu 135
3.13 Maintenance instructions 136
3.14 Parts list 141
4. Classification and discard
4.1 Classification 142
4.2 Discard 143
5. Inspection
5.1 Visual inspection 144
5.2 Other inspections 145
6. Troubleshooting 148
A. Checklist Neptune 165
B. List replaced parts 166

Neptune ventilator Technical manual
1
1. ELECTRONIC SYSTEM
1.1 ELECTRONIC SYSTEM OVERVIEW
The Neptune contains several electronic printed circuit boards, which are located on
different locations in the machine.
Electronic system overview

2
• Mains AC input
The AC inlet at the back of the ventilator contains a fuse holder and power switch.
The AC mains voltage is connected to the AC/DC converter board.
• AC/DC converter board
The AC/DC converter board converts the AC mains voltage to +24V DC voltage.
The +24V DC is fully isolated from the AC mains voltage to ensure safe working
conditions.
• DC/DC power supply
The DC/DC power supply board generates different DC voltages and controls the
battery charging current. A special battery controller device will charge the battery
as safe as possible and under the best conditions to have a long battery lifetime.
The DC/DC power supply output voltages are:
o +5V DC
o +12V DC
o +24V DC
o +12V DC
• Extendable system set
The extendable system set consists of 4 different boards that are connected by
means of 2 elevated multiple pins connectors:
o MMI board
o Backplane board
o Master board
o Pneumatic board
The 4 different boards have their own specific tasks. The MMI board, master
board and the pneumatic board have one or more microprocessors and other
electronic devices on board. The backplane board only contains connectors and
has no microprocessor. The extendable system set is built so that further
expansion of the electronics is possible by means of the elevated multiple pins
connectors.
• Backplane board
The backplane board contains buzzer, O2 sensor, power switch and power supply
connectors. The power connector is connected to the DC/DC power supply. The
board is distributing the different DC voltages through the extendable system set.

3
• MMI board
The MMI board contains only one microprocessor. It’s reprogrammable so it can
be upgraded if necessary. The microprocessor controls all the graphical display
functions and is communicating - by means of the master board - with the
pneumatic board. The microprocessor is also controlling the keyboard board, the
control knob and the speaker.
• Master board
The master board contains one microprocessor and is also reprogrammable if
necessary. The master board looks after the communication between the MMI
board and pneumatic board.
The master board microprocessor checks the proper working of the MMI and
pneumatic board microprocessors. Otherwise, the MMI board microprocessor
checks the proper working of the master and pneumatic board microprocessor and
the pneumatic board microprocessor checks the MMI and master board
microprocessors. Each microprocessor is checking the other microprocessors for
errors or malfunctions, which makes the ventilator a very safe system. Once an
error is found, the electronics stop working and a continuous beep is audible.
Note: The ventilator automatically switches over to manual mode after an error
or malfunction is detected.
• Pneumatic board
The pneumatic board contains one microprocessor. This microprocessor is
reprogrammable for upgrades if necessary. The pneumatic board of course
controls the pneumatic functions of the ventilator. There are six pressure
transducers mounted on the board for measuring all kinds of parameters. The
pneumatic board also drives the electrical valves on the manifold and bottle. The
microprocessor receives settings from the MMI board and processes the values.
The pneumatic board microprocessor sends information back to the MMI board
like e.g.: actual airway pressure, alarms, patient status values, etc.
• Keyboard board
The keyboard board contains several switches and leds for interaction between the
operator and the electronic system. The keyboard board is connected to the MMI
board and processed by the microprocessor on the MMI board.

4
• Graphical display
The graphical display shows all kind of information. It consists of menus, settings,
parameters, graphs, etc. The display is also responsible for interaction between the
operator and the ventilator electronics.
Along with the keyboard switches and leds, they form the operator’s interface.

5
1.2 POWER SUPPLY
The AC mains inlet at the back of the ventilator is equipped with a power switch and a
fuse holder block. The fuse holder contains two fuses type 2A slow.
The AC mains voltage must be in the range from 100V AC to 240V AC. The AC
mains frequency must be in the range from 50 Hz to 60 Hz. These are the absolute
maximum ratings for the AC mains supply.
1.2.1 Replacing the AC mains fuses
Replace the AC mains fuses by mean of the following instructions:
- Turn off the Neptune and disconnect the power cord from the mains
inlet.
- Insert a screwdriver in the small AC receptacle and pull out the fuse
holder block.
- Replace the blown fuses and place the fuse holder block back into the
AC receptacle.
- Connect the power cord back to the AC mains inlet.
Note: Always replace the blown fuses with the same type and ratings.
1.2.2 Block diagram
The power supply block diagram is represented on the next page.

6
Block diagram power supply

7
The battery-charging unit charges the battery to maintain a maximum battery capacity
and life.
If the AC mains supply voltage is present, the battery is charged with a maximum
current of approximately 0,9 Ampere. After a while, the charging current decreases
and a minimum trickle current of 0.09 Ampere flows through the battery. To
guarantee full recharge of an exhausted battery, connect the ventilator to the mains
supply for at least a couple of hours.
Note: The switch at the back of the ventilator must be turned ON to activate the
battery charging.
Note: The ventilator uses high voltages, capable of causing personal injury.
Do not touch the AC mains voltage electronics during operation.
If an AC mains power failure occurs, the power supply automatically switches over to
battery supply. You can work approximately 1 hour on battery supply. The battery-
charging unit monitors the battery voltage and checks for a battery voltage lower than
10,5 Volt. If the battery voltage is getting lower than 10,5 Volt, the power supply
electronics is disconnected from the battery to prevent a totally exhausted battery. A
totally exhausted battery will shrink the battery lifetime enormously.
An audible alarm is activated during 20 seconds after the ventilator shuts off because
of an empty battery.
The power supply board is equipped with 5 fuses:
- battery fuse F1: 3,15A slow
- +5V DC fuse F2: 3,15A slow
The green LEDs indicate if a voltage is present:
- LED D19 indicates the +24V DC input voltage from AC/DC converter
- LED D14 indicates the +5V DC output voltage
The +24 Volt DC output voltage is not available when working on battery. This
means that LED D19 and D17 aren’t lit in this situation.
You can rapidly determine a blown fuse by taking a look at the LED indicators. There
is no LED indicator provided on the battery input voltage to prevent a waste of battery
power.

8
The power supply board is provided with four connectors:
• Connector P3:
Pin number Description
1 +24V DC input voltage
2 +24V DC input voltage
3 GND
4 GND
5 Battery + input voltage
6 Battery – input voltage
• Connector P1:
1 +5V DC output voltage
2 GND
4 GND
6 GND
• Connector P2:
3 GND
4 GND
• Connector P4:
1 AC mains LED indicator voltage
2 Ventilator ON/OFF switch input
3 Ventilator ON/OFF switch input
1.2.3 Schematic diagram
The schematic diagram of the power supply is represented on the following pages.

9
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A
B
C
D
4
3
2
1
D
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B
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Title
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IN+
3
IN+
14
IN-
2
IN-
15
IN+ OP1
5
IN+ OP2
12
IN- OP1
6
IN- OP2
11
OUT
1
OUT 16
OUT
7
OUT 10
FB
8 CATHOD 9
V+
4
V-
13
U1 LM61
GND
R1
93K1
R2
13k
R3
1k2
D1 MBR36
D2 MBR36
D3 MBR36
Q1
BS17
GND
R4
100K
R5
1M
C1
1µF/25
C2
1µF/25
GND
D11
1n414
GND
R6
18k
R7
R243
2
1
3
Q5
BS25
C3
10µF/25
GND
c/s-
2
c/l-
4
c/s+
3
v.in
5
c/s
1
o.c.t.
8
gnd
6
p.i.
7 o.ch.ind 9
st.lev.con 10
trik.bia 11
char.en.
12
vol.sens 13
comp.
14
d.so.
15
d.si.
16
U2 UC390
Q8
BD242
R8
R0.2
R9
107K
R10
R787
R11
23k
R12
R470
D4
MBR36
R13
294K
C4
100N
GND
GND
GND
R14
1k
D13
BZ
X7
9C
20
GND GND
R16
100K
R19
47
0K
Q2
BS17
GND
Q6
BS25
R17
100K
GND GND
B1
BUZZE
C6
2200µF/25
GND
R20
R330
D12
1N414
+12V
+12V
+12V
+12V
+24v
+VBA
GND
2
1
3
Q9
RFP30P0
Q7
BS25
Q3
BS17
1
2
3
14
7
U3A
CD409
5
6
4
14
7
U3B
CD409
8
9
10
14
7
U3C
CD409
12 13
11
14 7
U3D
CD409
GND
GND
GND
GND
+12V
+12V
+12V
+12V
GND
+12V
GND
F1
3.15A/
GND
GND
GND
+12V
+12V
GND
+12V
+12V
S
6
CLK
3
D
5
R
4
Q
1
Q
2
VCC
14
GND
7
U4A CD4013
S
8
CLK
11
D
9
R
10
Q
13
Q
12
VCC
14
GND
7
U4B CD4013
D5 MBR36
R21
22K
C5
100N
C7
100N/40
GND
GND
R18
100
+12V
C9
10µF/25
GND
POWER SUPPLY
1 2
JP - KDP
PSU042000V1
R22
680K
1
2
3
P4
GND
+24v
1
2
3
4
5
6
P3
+24v
GND
+24V
DC INPUT
+24V
+24V
GND
GND
BAT+
BAT-
KEYBOAR
D6 MBR36
D7 MBR36
+24V
+24V
+24V
SW5V
SW12
+12Vou
SW16
+16Vou
SW_ON_OFF
SW_ON_OFF
POWER
regulators.sc
SW5V
SW12
+12Vou
SW16
+16Vou
SW_ON_OFF
SW_ON_OFF
R23
100R
+24V
C8
100N/40
GND
+24V
+16Vou
SW16
+12Vou
SW12
SW5V
SW_ON_OFF
SW_ON_OFF
GND
D19
GREE
R36
10K

10
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4
3
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FB
4
ON/OFF
5
GND
3
IN
1
OUT
2
U5 MIC4576BT
FB
4
ON/OFF
5
GND
3
IN
1
OUT
2
U6 MIC4576BT
+ C10
470µF/63V
+ C11
470µF/63V
GND
GND
L1
68µH
L2
68µH
D8
MBR360
D9
MBR360
GND
GND
C13
1000µF/50V
C14
1000µF/50V
GND
GND
R24
13K
R25
1K5
R27
R4530
R26
1K5
GND
GND
F2
3.15A/T
F3
3.15A/T
D14
GREEN
R15
1K
GND
GND
D15
GREEN
R28
2K7
GND
GND
C16
3.3N/63V
C17
3.3N/63V
POWER SUPPLY - REGULATORS
2 2
JP - KDP
PSU042000V1
SW5V
SW12V
+12Vout
SW16V
+16Vout
SW_ON_OFF1
SW_ON_OFF2
POWER SUPPLY
SW5V
SW12V
+12Vout
SW16V
+16Vout
SW_ON_OFF1
SW_ON_OFF2
1
2
3
4
5
6
P1
GND
GND
GND
GND
+24V
GND
+12V
GND
+5V
+ C12
470µF/63V
GND
D10
MBR745
L3
68µH
R30
9090
R31
1500
GND
C15
1000µF/50V
GND
C19
10N
DC OUTPUT CONNECTOR 1
F5
3.15A/T
GND
D16
GREEN
R29
2K7
+24v
GND
D17
GREEN
R32
10K
1
2
3
4
P2
GND
DC OUTPUT CONNECTOR 2
+16V
GND
GND
+16V
F4
3.15A/T
+16Vout
SW16V
+12Vout
SW12V
SW5V
SW_ON_OFF1
D18
20V
GND
Vin
5
Vsw
4
GND
3
Vc
2
FB
1
U7 LT1074CT
GND
GND
R33
2K7
GND
Q4
BS170
GND
2
1
3
Q10
RFP30P05
R34
100K
R35
100K
SW_ON_OFF2

11
1.2.4 Power supply board layout
Note: Fan drive output voltage indicated by D16 = 12 Volt

12
1.3 BACKPLANE BOARD
1.3.1 Block diagram
The block diagram of the backplane board is represented on the next page.
The DC voltages coming from the power supply are distributed on the backplane
board. Connector P1 is the connection to the power board.
Connector P2 and P3 are supplying the extendable system set of electrical power.
Connector P5 is the power on/off connection to the power supply (P4).
Connector P4 connects to the MMI board through a flatcable.
Connector P6 is used to connect the buzzer and the O2 sensor.

13
Block diagram backplane board

14
The schematic diagram of the backplane board is represented on the next page.

15

16
1.3.3 Backplane board layout

17
1.4 MMI BOARD
1.4.1 Block diagram
The block diagram of the MMI board is represented on the following page.
There is only one microprocessor provided on the MMI board. This main
microprocessor controls the control knob, the keyboard, the speaker sound, LCD and
the communication. It is reprogrammable by means of the programming interface
connector P1.
All the graphical data is stored in the flash memory. This flash memory is also
reprogrammable with the use of connector P1.
The RAM memory is used as video memory. The video memory is copied through the
LCD data bus to the on-board LCD controller.
The LED indicators are located on the top of the MMI board and consist of four
LEDs: one green LED and three red LEDs. They give you helpful information when
an error occurs. More about errors and malfunctions of the ventilator is described later
in this manual.
The main microprocessor is communicating with the master board by means of
connector P2. The MMI board sends to and receives information from the master
board. The master board can transmit to and receive data from the pneumatic board.
In this way the MMI board is communication with the pneumatic board.

18
Block diagram MMI board

19
The schematic diagram of the MMI board is represented on the following pages.

20
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4
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OC
1
C
11
1D
2
2D
3
3D
4
4D
5
5D
6
6D
7
7D
8
8D
9
1Q
19
2Q
18
3Q
17
4Q
16
5Q
15
6Q
14
7Q
13
8Q
12
U1
74VHC573
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
ALE
GND
A0
A1
A2
A3
A4
A5
A6
A7
MEMORY
MEMORY
MMI_MEMORY.sch
MEMORY
A8
A9
A10
A11
A12
A13
A14
A15
7SEG - LED
7 SEG-LED BAR
MMI_LED.sch
7SEG - LED
RD
WR
SPI
RS485 DRIVER
MMI_SPI.sch
SPI
LP
ADC_CS
ADC_SCK
7SEG_CS
LEDBAR_CS
DATA
CLOCK
XSCL
CONTRAST_CS
PE0
PE1
KEY_Y3
KEY_Y1
KEY_Y2
PB4
MISO
MOSI
SS
BUZ_CS
BUZ_ON_OFF
PB1
GND GND
VCC
PB7
MMI board
HDH
GND
PF7
PF6
PF5
VCC
PF4
PB7
VCC
PB4
PB5
PB6
PB6
PB5
C1
12P. C2
12P.
GND
R1
100K
R2
100K
R3
100K
R4
100K
1
2
3
4
5
10
9
8
7
6
SW1
DS-05 APEM
R5
1K5
R6
1K5
R7
1K5
R8
1K5
GND
VCC
C3
100N
C4
100N
C5
100N
GND
VCC
PF4
PF5
PF6
PF7
X1
16MHz
1 5
MMI 092003v1 v1.0
ENC_B
ENC_A
ADC_DATA
VCC
1
Vref
2
Vin
3
GND
4
/CS
5
SDO
6
SCK
7
Fo
8
U2
LTC2400CS8
VCC
1
Vout
2
GND
3
U3
MAX6120EUR
R12
4K7
+ C22
2,2µ
/
10V
Tant.
C6
100N C23
1N
AGND AGND AGND
AGND
AGND
VCC VCC
VCC
1,2V
ADC_DATA
ADC_SCK
ADC_CS
+
-
DIN
2
SCLK
1
CS
3
VCC
14
GND
5
H
11
W
12
L
13
OUT
7
SHDN
4
IN-
8
IN+
9
VSS
6
VDD
10
U4
MAX5437EUD
R13
18K
+12V
+12V
GND
GND
VCC
CLOCK
DATA
BUZ_CS
BUZZER
BUZ_ON_OFF
KB_INT
LCD
LCD
MMI_LCD.sch
LCD
PA0(AD0)
51
PA1(AD1)
50
PA2(AD2)
49
PA3(AD3)
48
PA4(AD4)
47
PA5(AD5)
46
PA6(AD6)
45
PA7(AD7)
44
PC0(A8)
35
PC1(A9)
36
PC2(A10)
37
PC3(A11)
38
PC4(A12)
39
PC5(A13)
40
PC6(A14)
41
PC7(A15)
42
PD0(INT0)
25
PD1(INT1)
26
PD2(INT2)
27
PD3(INT3)
28
PD4(IC1)
29
PD5
30
PD6(T1)
31
PD7(T2)
32
PB0(ss)
10
PB1(SCK)
11
PB2(MOSI)
12
PB3(MISO)
13
PB4(OC0/PWM0)
14
PB5(OC1A/PWM1A)
15
PB6(OC1B/PWM1B)
16
PB7(OC2/PWM2)
17
PE0(PDI/RXD)
2
PE1(PDO/TXD)
3
PE2(AC+)
4
PE3(AC-)
5
PE4(INTR4)
6
PE5(INTR5)
7
PE6(INTR6)
8
PE7(INTR7)
9
PF0(ADC0)
61
PF1(ADC1)
60
PF2(ADC2)
59
PF3(ADC3)
58
PF4(ADC4)
57
PF5(ADC5)
56
PF6(ADC6)
55
PF7(ADC7)
54
RD
34
WR
33
XTAL1
24
XTAL2
23
ALE
43
TOSC1
19
TOSC2
18
RESET
20
AREF
62
AGND
63
AVCC
64
PEN
1
VCC
52
GND
22
GND
53
VCC
21
ATmega103L
U6
ATMEGA128-16AI
D1 D2 D3 D4
OC
1
CLK
11
1D
2
2D
3
3D
4
4D
5
5D
6
6D
7
7D
8
8D
9
1Q
19
2Q
18
3Q
17
4Q
16
5Q
15
6Q
14
7Q
13
8Q
12
U7
74VHC574
GND
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
1 2
U8A
74VHC14
1
2
3
U9A
74VHC32
4
5
6
U9B
74VHC32
3 4
U8B
74VHC14
8
9
10
U9C
74VHC32
11
12
13
U9D
74VHC32
1
2
3
U10A
74VHC32
5 6
U8C
74VHC14
A15
A14
CS_LCD
A15
A14
WR
F_A15
F_A16
F_A17
F_A18
R_A15
R_A16
4
5
6
U10B
74VHC32
8
9
10
U10C
74VHC32
11
12
13
U10D
74VHC32
RST
KEY_Y1
KEY_Y2
KEY_Y3 ENC_SW
KB_INT
CS_F
CS_R
GND
1
2
Pspare
HEADER 2X1
O2

21
1 2 3 4 5 6
A
B
C
D
6
5
4
3
2
1
D
C
B
A
Title
Number Revision
Size
B
File: C:G..MMI_MEMORY.sch Drawn By:
Checked
MEMORY
MMI MEMORY
C7
100N
C8
100N
VCC
HDH
2 5
MMI 092003v1 v1.0
A0
12
A1
11
A2
10
A3
9
A4
8
A5
7
A6
6
A7
5
A8
27
A9
26
A10
23
A11
25
A12
4
A13
28
A14
29
A15
3
A16
2
A17
30
A18
1
WR
31
OE
24
CE
22
I/O0
13
I/O1
14
I/O2
15
I/O3
17
I/O4
18
I/O5
19
I/O6
20
I/O7
21
U11
AM29F040B_90EC
4 Mbit FLASH MEMORY 1 Mbit SRAM
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
F_A15
F_A16
F_A17
F_A18
WR
RD
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
R_A15
R_A16
WR
RD
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
CS_F
CS_R
VCC
A0
1
A1
2
A2
3
A3
4
A4
13
A5
14
A6
15
A7
16
A8
17
A9
18
A10
19
A11
20
A12
21
A13
29
A14
30
A15
31
A16
32
WR
12
OE
28
CE
5
I/O1
6
I/O2
7
I/O3
10
I/O4
11
I/O5
22
I/O6
23
I/O7
26
I/O8
27
U12
HY628100B LLT1-70

22
1 2 3 4 5 6
A
B
C
D
6
5
4
3
2
1
D
C
B
A
Title
Number Revision
Size
B
File: C:G..MMI_LED.sch Drawn By:
Checked
7 SEGMENT DISPLAY - LED BAR
HDH
3 5
MMI 092003v1 v1.0
a
16
b
15
c
3
d
2
e
1
f
18
g
17
DP
4
DIG1
14
DIG2
13
a
11
b
10
c
8
d
6
e
5
f
12
g
7
DP
9
D5
a
16
b
15
c
3
d
2
e
1
f
18
g
17
DP
4
DIG1
14
DIG2
13
a
11
b
10
c
8
d
6
e
5
f
12
g
7
DP
9
D6
C-562G
PARALIGHT
a
16
b
15
c
3
d
2
e
1
f
18
g
17
DP
4
DIG1
14
DIG2
13
a
11
b
10
c
8
d
6
e
5
f
12
g
7
DP
9
D7
C-562G
PARALIGHT
a
16
b
15
c
3
d
2
e
1
f
18
g
17
DP
4
DIG1
14
DIG2
13
a
11
b
10
c
8
d
6
e
5
f
12
g
7
DP
9
D8
C-562G
PARALIGHT
a
16
b
15
c
3
d
2
e
1
f
18
g
17
DP
4
DIG1
14
DIG2
13
a
11
b
10
c
8
d
6
e
5
f
12
g
7
DP
9
D9
C-562G
PARALIGHT
a
16
b
15
c
3
d
2
e
1
f
18
g
17
DP
4
DIG1
14
DIG2
13
a
11
b
10
c
8
d
6
e
5
f
12
g
7
DP
9
D10
C-562G
PARALIGHT
a
16
b
15
c
3
d
2
e
1
f
18
g
17
DP
4
DIG1
14
DIG2
13
a
11
b
10
c
8
d
6
e
5
f
12
g
7
DP
9
D11
C-562G
PARALIGHT
Aa
1
Ab
21
20
11
12
13
14
15
16
17
18
19
Ba
2
Bb
22
Ca
3
Cb
23
Da
4
Db
24
Ea
5
Eb
25
Fa
6
Fb
26
Ga
7
Gb
27
Ha
8
Hb
28
Ia
9
Ib
29
Ja
10
Jb
30
D14
MV59164
Aa
1
Ab
21
20
11
12
13
14
15
16
17
18
19
Ba
2
Bb
22
Ca
3
Cb
23
Da
4
Db
24
Ea
5
Eb
25
Fa
6
Fb
26
Ga
7
Gb
27
Ha
8
Hb
28
Ia
9
Ib
29
Ja
10
Jb
30
D15
MV59164
Aa
1
Ab
21
20
11
12
13
14
15
16
17
18
19
Ba
2
Bb
22
Ca
3
Cb
23
Da
4
Db
24
Ea
5
Eb
25
Fa
6
Fb
26
Ga
7
Gb
27
Ha
8
Hb
28
Ia
9
Ib
29
Ja
10
Jb
30
D16
MV59164
Aa
1
Ab
21
20
11
12
13
14
15
16
17
18
19
Ba
2
Bb
22
Ca
3
Cb
23
Da
4
Db
24
Ea
5
Eb
25
Fa
6
Fb
26
Ga
7
Gb
27
Ha
8
Hb
28
Ia
9
Ib
29
Ja
10
Jb
30
D17
MV59164
Aa
1
Ab
21
20
11
12
13
14
15
16
17
18
19
Ba
2
Bb
22
Ca
3
Cb
23
Da
4
Db
24
Ea
5
Eb
25
Fa
6
Fb
26
Ga
7
Gb
27
Ha
8
Hb
28
Ia
9
Ib
29
Ja
10
Jb
30
D13
MV59164
Aa
1
Ab
21
20
11
12
13
14
15
16
17
18
19
Ba
2
Bb
22
Ca
3
Cb
23
Da
4
Db
24
Ea
5
Eb
25
Fa
6
Fb
26
Ga
7
Gb
27
Ha
8
Hb
28
Ia
9
Ib
29
Ja
10
Jb
30
D12
MV59164
SEG
A
14
SEG
B
16
SEG
C
20
SEG
D
23
SEG
E
21
SEG
F
15
SEG
G
17
SEG
DP
22
DIG
0
2
DIG
1
11
DIG
2
6
DIG
3
7
DIG
4
3
DIG
5
10
DIG
6
5
DIG
7
8
DIN
1
CLK
13
LOAD(CS)
12
GND
4
GND
9
V+
19
Iset
18
Dout
24
U13
MAX7221CWG
SEG
A
14
SEG
B
16
SEG
C
20
SEG
D
23
SEG
E
21
SEG
F
15
SEG
G
17
SEG
DP
22
DIG
0
2
DIG
1
11
DIG
2
6
DIG
3
7
DIG
4
3
DIG
5
10
DIG
6
5
DIG
7
8
DIN
1
CLK
13
LOAD(CS)
12
GND
4
GND
9
V+
19
Iset
18
Dout
24
U14
MAX7221CWG
GNDGND GNDGND GNDGND GNDGND
DATA
CLOCK
7SEG_CS
R14
12K
R15
12K
R16
12K
R17
12K
VCC VCC VCC VCC
DATA
1_SEGA
1_SEGB
1_SEGC
1_SEGD
1_SEGE
1_SEGF
1_SEGG
1_SEGDP
1_DIG0
1_DIG1
1_DIG2
1_DIG3
1_DIG4
1_DIG5
1_DIG6
1_DIG7
2_SEGA
2_SEGB
2_SEGC
2_SEGD
2_SEGE
2_SEGF
2_SEGG
2_SEGDP
2_DIG0
2_DIG1
2_DIG2
2_DIG3
2_DIG4
2_DIG5
2_DIG6
2_DIG7
3_SEGA
3_SEGB
3_SEGC
3_SEGD
3_SEGE
3_SEGF
3_SEGG
3_SEGDP
3_DIG0
3_DIG1
3_DIG2
3_DIG3
3_DIG4
3_DIG5
3_DIG6
3_DIG7
4_SEGA
4_SEGB
4_SEGC
4_SEGD
4_SEGE
4_SEGF
4_SEGG
4_SEGDP
4_DIG0
4_DIG1
4_DIG2
4_DIG3
4_DIG4
4_DIG5
4_DIG6
4_DIG7
LEDBAR_CS
1_SEGA
1_SEGB
1_SEGC
1_SEGD
1_SEGE
1_SEGF
1_SEGG
1_SEGDP
1_SEGA
1_SEGB
1_SEGC
1_SEGD
1_SEGE
1_SEGF
1_SEGG
1_SEGDP
1_SEGA
1_SEGB
1_SEGC
1_SEGD
1_SEGE
1_SEGF
1_SEGG
1_SEGDP
1_SEGA
1_SEGB
1_SEGC
1_SEGD
1_SEGE
1_SEGF
1_SEGG
1_SEGDP
2_SEGA
2_SEGB
2_SEGC
2_SEGD
2_SEGE
2_SEGF
2_SEGG
2_SEGDP
2_SEGA
2_SEGB
2_SEGC
2_SEGD
2_SEGE
2_SEGF
2_SEGG
2_SEGDP
2_SEGA
2_SEGB
2_SEGC
2_SEGD
2_SEGE
2_SEGF
2_SEGG
2_SEGDP
2_SEGA
2_SEGB
2_SEGC
2_SEGD
2_SEGE
2_SEGF
2_SEGG
2_SEGDP
2_SEGA
2_SEGB
2_SEGC
2_SEGD
2_SEGE
2_SEGF
2_SEGG
2_SEGDP
2_SEGA
2_SEGB
2_SEGC
2_SEGD
2_SEGE
2_SEGF
2_SEGG
2_SEGDP
2_SEGA
2_SEGB
2_SEGC
2_SEGD
2_SEGE
2_SEGF
2_SEGG
2_SEGDP
2_SEGA
2_SEGB
2_SEGC
2_SEGD
2_SEGE
2_SEGF
2_SEGG
2_SEGDP
1_SEGA
1_SEGB
1_SEGC
1_SEGD
1_SEGE
1_SEGF
1_SEGG
1_SEGDP
1_SEGA
1_SEGB
1_SEGC
1_SEGD
1_SEGE
1_SEGF
1_SEGG
1_SEGDP
1_DIG0
1_DIG1
1_DIG2
1_DIG3
2_DIG0
2_DIG1
2_DIG2
2_DIG3
2_DIG4
2_DIG5
2_DIG6
2_DIG7
1_DIG4
1_DIG5
TIDAL VOLUME
MINUTE VOLUME
PEAK PLATEAU MEAN PEEP O2
3_DIG0
3_DIG1
3_DIG2
3_DIG3
3_DIG4
3_DIG5
3_DIG6
3_DIG7
4_DIG0
4_DIG1
4_DIG2
4_DIG3
4_DIG4
4_DIG5
4_DIG6
3_SEGA
3_SEGB
3_SEGC
3_SEGD
3_SEGE
3_SEGF
3_SEGG
3_SEGDP
3_SEGA
3_SEGB
3_SEGC
3_SEGD
3_SEGE
3_SEGF
3_SEGG
3_SEGDP
3_SEGA
3_SEGB
3_SEGC
3_SEGD
3_SEGE
3_SEGF
3_SEGG
3_SEGDP
3_SEGA
3_SEGB
3_SEGC
3_SEGD
3_SEGE
3_SEGF
3_SEGG
3_SEGDP
3_SEGA
3_SEGB
3_SEGC
3_SEGD
3_SEGE
3_SEGF
3_SEGG
3_SEGDP
3_SEGA
3_SEGB
3_SEGC
3_SEGD
3_SEGE
3_SEGF
3_SEGG
3_SEGDP
3_SEGA
3_SEGB
3_SEGC
3_SEGD
3_SEGE
3_SEGF
3_SEGG
3_SEGDP
3_SEGA
3_SEGB
3_SEGC
3_SEGD
3_SEGE
3_SEGF
3_SEGG
3_SEGDP
4_SEGA
4_SEGB
4_SEGC
4_SEGD
4_SEGE
4_SEGF
4_SEGG
4_SEGDP
4_SEGA
4_SEGB
4_SEGC
4_SEGD
4_SEGE
4_SEGF
4_SEGG
4_SEGDP
4_SEGA
4_SEGB
4_SEGC
4_SEGD
4_SEGE
4_SEGF
4_SEGG
4_SEGDP
4_SEGA
4_SEGB
4_SEGC
4_SEGD
4_SEGE
4_SEGF
4_SEGG
4_SEGDP
4_SEGA
4_SEGB
4_SEGC
4_SEGD
4_SEGE
4_SEGF
4_SEGG
4_SEGDP
4_SEGA
4_SEGB
4_SEGC
4_SEGD
4_SEGE
4_SEGF
4_SEGG
4_SEGDP
4_SEGA
4_SEGB
4_SEGC
4_SEGD
4_SEGE
4_SEGF
4_SEGG
4_SEGDP
7SEG - LED
C9
100N
C10
100N
C11
100N
GND
VCC
C12
100N
SEG
A
14
SEG
B
16
SEG
C
20
SEG
D
23
SEG
E
21
SEG
F
15
SEG
G
17
SEG
DP
22
DIG
0
2
DIG
1
11
DIG
2
6
DIG
3
7
DIG
4
3
DIG
5
10
DIG
6
5
DIG
7
8
DIN
1
CLK
13
LOAD(CS)
12
GND
4
GND
9
V+
19
Iset
18
Dout
24
U15
MAX7221CWG
SEG
A
14
SEG
B
16
SEG
C
20
SEG
D
23
SEG
E
21
SEG
F
15
SEG
G
17
SEG
DP
22
DIG
0
2
DIG
1
11
DIG
2
6
DIG
3
7
DIG
4
3
DIG
5
10
DIG
6
5
DIG
7
8
DIN
1
CLK
13
LOAD(CS)
12
GND
4
GND
9
V+
19
Iset
18
Dout
24
U16
MAX7221CWG
+ C100
10µ / 10V Tant.
+ C101
10µ / 10V Tant.
+ C102
10µ / 10V Tant.
+ C103
10µ / 10V Tant.

23
1 2 3 4 5 6
A
B
C
D
6
5
4
3
2
1
D
C
B
A
Title
Number Revision
Size
B
File: C:G..MMI_SPI.sch Drawn By:
Checked
DE1/RE1
1
DE2/RE2
4
DE3/RE3
5
DR1
2
DR2
3
DR3
6
RO4
7
DI4
8
DE4
9
RE4
10
GND
11
OB4
12
OA4
13
OB3
14
OA3
15
OB2
17
OA2
18
OB1
19
OA1
20
U17
DS36954
SS
SS
MISO
MISO
MOSI
SCK
MISOA
MISOB
MOSIA
MOSIB
SCKA
SCKB
SSSLV1A
SSSLV1B
SPI
GND
RST
PB1
PE1
PE0
PSCK
PMISO
PMOSI
SCK
KEY_X2
KEY_X1
GND
VCC
4
MR
3
RST
2
GND
1
U18
MAX811L
GND
VCC
1 2
3 4
5 6
7 8
9 10
P1
HEADER 5X2 HAAKS
VCC
GND
PSCK
PMISO
PMOSI
GND
RST
MMI SPI
C13
100N
C14
100N
C15
100N
GND
VCC
MOSIA
MISOA
SCKA
SSSLV1A
MOSIB
MISOB
SCKB
SSSLV1B
AGND
GND
R18
5K6
R19
5K6
R20
5K6
R21
5K6
MOSIA
MISOA
SCKA
SSSLV1A
MOSIB
MISOB
SCKB
SSSLV1B
+12V VCC
GND
C16
100N
+ C24
4µ7
/
16V
Tant.
+ C25
4µ7
/
16V
Tant.
C17
100N
GND
AX
12
AY
13
BX
2
BY
1
CX
5
CY
3
A
11
B
10
C
9
INH
6
O/IA
14
O/IB
15
O/IC
4
U19
74HC4053
HDH
4 5
MMI 092003v1 v1.0
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
P2
HEADER 10X2
BUZZER +24V
O2
GND
PS_ON_OFF
VCC
+12V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
P3
R22
1K8
GND
R24
3K3
D18
ZENER
20V
0,4W
+24V
PS_ON_OFF
1_SEGA
1_SEGB
1_SEGC
1_SEGD
1_SEGE
1_SEGF
1_SEGG
1_SEGDP
1_DIG6
1_DIG7
R9
1K5
R10
1K5
GND
GND
KEY_X1
KEY_X2
KEY_Y1
KEY_Y2
KEY_Y3
GND
CONNECT
TO
KEYBOARD
R25
3K3
R26
3K3
VCC
VCC
ENC_SW
ENC_A
ENC_B
Q1
MMBF170
R23
1K8
9 8
U8D
74AHC14
11
10
U8E
74VHC14
13 12
U8F
74VHC14
R11
1K5
GND
R27
3K3
VCC
GND
GND
CY1
CY2
CY3
GND GND
GND
VCC
1 2
3 4
5 6
7 8
9 10
P4
HEADER 5X2

24
1 2 3 4 5 6
A
B
C
D
6
5
4
3
2
1
D
C
B
A
Title
Number Revision
Size
B
File: C:G..MMI_LCD.sch Drawn By:
Checked
LCD INTERFACE
HDH
5 5
MMI 092003v1 v1.0
D0
59
D1
60
D2
1
D3
2
D4
3
D5
4
D6
5
D7
6
OSC1
54
OSC2
55
VA0
43
VA1
42
VA2
41
VA3
40
VA4
39
VA5
38
VA6
37
VA7
36
VA8
35
VA9
34
VA10
33
VA11
32
VA12
31
VA13
30
VA14
28
VA15
27
VD0
26
VD1
25
VD2
24
VD3
23
VD4
22
VD5
21
VD6
20
VD7
19
YSCL
18
YD
17
YDIS
16
WF
15
LP
14
XSCL
12
XECL
11
VRW
44
VCE
45
RES
47
RD
50
WR
51
SEL2
52
SEL1
53
CS
56
A0
57
XD0
10
XD1
9
XD2
8
XD3
7
NC
29
NC
46
NC
48
NC
49
U20
S1D13305F00A1
A0
10
A1
9
A2
8
A3
7
A4
6
A5
5
A6
4
A7
3
A8
25
A9
24
A10
21
A11
23
A12
2
A13
26
WR
27
CE
20
OE
22
A14
1
D0
11
D1
12
D2
13
D3
15
D4
16
D5
17
D6
18
D7
19
256
U21
BS62LV256SC-70
VA0
VA1
VA2
VA3
VA4
VA5
VA6
VA7
VA8
VA9
VA10
VA11
VA12
VA13
VA14
VD0
VD1
VD2
VD3
VD4
VD5
VD6
VD7
VA0
VA1
VA2
VA3
VA4
VA5
VA6
VA7
VA8
VA9
VA10
VA11
VA12
VA13
VA14
VD0
VD1
VD2
VD3
VD4
VD5
VD6
VD7
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
A0
GND
GND
RST
WR
RD
CS_LCD
X2
10
MHz
C26
10P.
C27
10P.
GND GND
XD0
XD1
XD2
XD3
YD
LP
XSCL
C18
100N
C19
100N
GND GND
VCC VCC
VA15
VA15
C20
100N
GND
VCC
VWR
VWR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
P5
XD0
XD1
XD2
XD3
VCC
GND
YD
LP
XSCL
CONNECT
TO
LCD
DISPLAY
POL
2
ISET
5
SHDN
1
VCC
8
LX
7
FB
4
REF
3
GND
6
U22
MAX629ESA
VCC
C21
100N
+
C28
10µ
/
35V
Tant.
Low
ESR
GND GND
L1
47µH
C30
2.2µF / 40V
D19
MBR0540T1
D20
MBR0540T1
+
C29
10µ / 35V Tant. Low ESR
R28
120K
R30
6k8
C31
100pF
/
40
V
C32
2.2µF / 10V
GND GND
GND
GND
-22V
+
-
DIN
2
SCLK
1
CS
3
VCC
14
GND
5
H
11
W
12
L
13
OUT
7
SHDN
4
IN-
8
IN+
9
VSS
6
VDD
10
U5
MAX5437EUD
VCC
GND
R31
270K
VCC
R29
68K
D0
D1
D3
D2
/DOFF
FLM
N.C.
CL1
CL2
VDD
VSS
Vo
VSS
VEE
Vo
1
2
P6
CONNECT TO LED BACKLIGHT
Vout
1
GND
2
GND
3
NC
4
NC
5
GND
6
GND
7
Vin
8
U23
LM78L05ACM
+12V
R32
82E
GND
R33
2E
DATA
CONTRAST_CS
CLOCK
1 2
STR1
VCC
1
2
STR2

25
1.4.3 MMI board layout

26

27
1.4.4 Built-in test software
• Start-up test
After turning the ventilator on, the MMI board will test the different functions.
During start-up the following tests are executed:
o Microprocessor internal functions tests:
ƒ test internal program memory
ƒ test internal SRAM memory
ƒ test the timers
ƒ test internal EEPROM memory
ƒ test Watchdog
o Microprocessor external functions tests:
ƒ test external SRAM memory
ƒ test external flash memory
ƒ test LCD driver with Medec logo
ƒ test keyboard for shorts
ƒ buzzer test

28
ƒ Visual test of the leds and the displays on the keyboard panel.
All segments and leds are on.
ƒ Visual test of the barograph
The green leds light up from left to right and the red leds from
right to left.
o Microprocessor communication test:
ƒ Tests the communication between MMI board and master
board.
When all these tests are executed successfully, the MMI board is ready to start
working. If an error occurred, the type of error is displayed on the LED indicators.
G R R R

29
After start-up, the LED indicators can show the following errors:
LED indicators Type error
G R R R
Device is working properly
G R R R
Microprocessor internal function error
G R R R
Microprocessor external function error
G R R R
Communication error
Note: During error free operation of the ventilator, the LED indicators might be
turned on and off by the software. This is quite normal and has nothing to
do with error codes.
To determine the exact error on the MMI board, you have to perform a specific test by
using the build-in test software.
Note: When executing a specific test on the MMI board, there will be no
communication between the master board and the MMI board. The master
board will interprete this as a communication error and a continuous beep
is audible. This can be very annoying. To prevent this error, put the master
board in internal test mode by setting dipswitch 1 high. For detailed
instructions, see the master board section later in this manual.

30
• Microprocessor internal function test
If a microprocessor internal error is detected, execute an internal function test as
follows:
o Turn the Neptune ventilator off
o Remove the upper cover plate at the back of the Neptune
o Change the dipswitch setting of the MMI board with a small
screwdriver to
1 2 3 4 5
o Turn the ventilator on
o The graphics display continuously shows the Medec logo
o Display changes from normal to inverted to flashing
o If no errors where found, all the red LEDs are off and the green LED is
blinking
o If an error is detected, the error is indicated on the red error LEDs and
the green LED is off. The possible errors are illustrated in the table on
the next page:

31
INTERNAL FUNCTION TEST ERROR CODES
Error LEDs Error code Description
G R R R
0 NO ERRORS detected, test loop is running
G R R R
1 Internal PROGRAM MEMORY error
G R R R
2 Internal SRAM error
G R R R
3 Internal TIMER error
G R R R
4 Internal EEPROM error
G R R R
5 Internal WATCHDOG error
G R R R
6 Reserved
G R R R
7 Reserved

32
# Resolve internal function test error code 4 - Internal EEPROM error
To fix error code 4 or internal EEPROM error, follow the next steps:
screwdriver to
1 2 3 4 5
o You will notice that all the LED indicators are blinking fast. This
means that the MMI board EEPROM settings are restored to the
factory settings. You need to check the values in the setup menu
afterwards
o Turn the ventilator off
o Repeat the microprocessor internal functions test described on the
previous page. If the EEPROM error still remains, contact an
authorized service engineer
Note: Restoring the MMI EEPROM settings will not affect the pneumatic board
EEPROM settings. Calibration of the ventilator is not needed in this case.
Just check the power-on parameters and the speaker sound volume in the
setup menu.
Warning: Try to resolve internal function error code 4 (EEPROM error) with
the instructions described above. For all other internal function test
errors, contact an authorized service engineer.

33
• Microprocessor external function test
If a microprocessor external error is detected, execute an external function test as
follows:
screwdriver to
1 2 3 4 5
o The Medec logo changes from time to time from normal to inverted to
flashing
o If no errors where found, all the red LEDs are off and the green LED is
blinking. Some devices need to be visually checked for failures.
o Visual test for the barograph: check that all red leds light up from right
to left and the green leds from left to right.

34
o 7 segment displays:
all segments light up once. When a digit is done, the Dp segment is lit.
After this test, a counter from 0 to F is displayed on all digits.

35
o Leds on the keyboard panel: the test starts with all leds off. Each led is
lit up once.
Battery => Tidal volume => Minute volume => O2 High => O2 Low
=> CMV => PCV => Manual => Standby => High pressure Alarm
=> Low pressure alarm => Apnea alarm => Trigger => LCD led.
After this test, the leds light up in the following sequence:
1° Standby (1)
2° Standby (1), High pressure (2)
3° Standby (1), High pressure (2), Low pressure (3)
4° Standby (1), High pressure (2), Low pressure (3), Apnea alarm (4)
5° Standby (1), High pressure (2), Low pressure (3), Apnea alarm (4),
Trigger (5)
Trigger (5) and LCD led (6)
o LCD contrast
In the FiO2 display appears a counter from 1 to 5.
The contrast of the LCD changes with each value.
1
2
3
4
5
6

36
o Alarm buzzer volume
In the FiO2 display appears a counter from 1 to 5.
The audio volume of the buzzer changes with each value.
o O2 sensor
In the FiO2 display appears O2.
When no sensor attached, the value should be around 7FFFF
When shorted, the value should be around 000000
A good sensor, should have a value around 3F8000

37
o If an error is detected, the error is indicated on the red error LEDs and
the green LED is off. The possible errors are illustrated in the table
below.
EXTERNAL FUNCTION TEST ERROR CODES
Error LEDs Error code Description
G R R R
0 NO ERRORS detected, test running
G R R R
1 External FLASH/ROM error
G R R R
2 External SRAM error
G R R R
3 LCD DISPLAY DRIVER error
G R R R
4 Reserved
G R R R
5 Reserved
G R R R
6 Reserved
G R R R
7 Reserved
Note: The external function test is running continuously. When an error is
detected, the error is indicated on the LED indicators, and the external
function test is repeated. It’s not necessary to turn the ventilator on and off
to repeat the external function test.

38
# Resolve external function test error code 1 - External flash error
There is a problem with the external flash memory. The microprocessor is only
reading data from the flash memory for display on the graphics display.
Contact an authorized service engineer if the problem cannot be resolved.
# Resolve external function test error code 2 - External SRAM error
There is a problem with the external SRAM memory. The microprocessor is reading
data from and writing data to the external SRAM memory.
# Resolve external function test error code 3 - External display driver error
There is a problem with the external display driver. It’s not necessary to connect the
graphics display with the MMI board to perform an external display driver test. The
microprocessor is writing data to and reading data from the display driver.
# Resolve external function test error code 4 - Keyboard error
There is a problem with the keyboard.
To define which error is detected on the keyboard controller, you can perform a
specific keyboard controller test:
screwdriver to
1 2 3 4 5
o The graphics display shows the Medec logo and all leds are off

39
o Press the volume mode key (1).
The leds tidal volume (2) and minute volume (3) should come on.
Release the key. The leds should be off.
o Press the CMV key (5).
The led CMV (4) should be on.
o Press the PCV key (7).
The led PCV (6) should be on.
o Press the Manual key (9).
The led Manual (8) should be on.
o Press the Standby key (11).
The led Standby (10) should be on.
o Press the Silent key (13).
The led LCD (12) should be on.
o Press the rotary knob (14).
The led battery (15) should be on.
1
2
3
4
10
11
12
13
5
6
7
8
9
14
15

40
• Microprocessor communication test
To perform a microprocessor communication test, perform the following test:
screwdriver to
o Change the dipswitch setting of the master board with a small
screwdriver to
o Turn the ventilator on.
o If no errors found, the green LED is blinking. If an error is detected,
the error is indicated on the red error LED’s and the green LED is off.
The red LED’s indicating the numbers of error’s detected (binary
number between 1 and 7).
• LED indicator test
To test the error LED indicators, perform the following test:
screwdriver to
1 2 3 4 5
o The error LEDs are blinking one by one

41
• Showing a test pattern on the graphics display
To test the display driver and/or graphics display, you can show a test pattern on
the graphics display. Perform the following instructions:
screwdriver to
1 2 3 4 5
o The graphics display shows a test pattern

42
• Alarm buzzer test
To test the buzzer, perform the following test:
screwdriver to
1 2 3 4 5
o In the FiO2 display (1) appears a counter from 1 to 5
The audio volume of the buzzer changes with each value

43
• LCD contrast test
To test the buzzer, perform the following test:
screwdriver to
1 2 3 4 5
o In the FiO2 display (1) appears a counter from 1 to 5
The LCD contrast changes with each value

44
• Barograph test
To test the barograph, perform the following test:
screwdriver to
1 2 3 4 5
o First test: the green leds light up from left to right in the airway
pressure window.
o Second test: the red leds light up from left to right in the airway
pressure window.
o Third test: both green and red leds light up from left to right in the
airway pressure window.

45
• Keyboard test
To test the barograph, perform the following test:
screwdriver to
1 2 3 4 5
o Press the volume mode key (1).
The leds tidal volume (2) and minute volume (3) should come on.
o Press the CMV key (5).
The led CMV (4) should be on.
o Press the PCV key (7).
The led PCV (6) should be on.
1
2
3
4
10
11
12
13
5
6
7
8
9
14
15

46
o Press the Manual key (9).
The led Manual (8) should be on.
o Press the Standby key (11).
The led Standby (10) should be on.
o Press the Silent key (13).
The led LCD (12) should be on.
o Press the rotary knob (14).
The led battery (15) should be on.

47
• Keyboard leds test
To test the keyboard leds, perform the following test:
screwdriver to
1 2 3 4 5
o First test: the leds light up one by one

48
o Second test: the leds light up in the following way:
1° Standby (1)
2° Standby (1), High pressure (2)
3° Standby (1), High pressure (2), Low pressure (3)
4° Standby (1), High pressure (2), Low pressure (3), Apnea alarm (4)
Trigger (5)
Trigger (5) and LCD led (6)
1
2
3
4
5
6

49
• 7 segment display test
To test the 7 segment displays, perform the following test:
screwdriver to
1 2 3 4 5
o First test: each segment lights up once. When a digit is done, the
decimal point segment is on.

50
o Second test: on each display a counter from 0 to F is displayed

51
• O2 sensor test
To test the 7 segment displays, perform the following test:
screwdriver to
1 2 3 4 5
In the FiO2 display appears O2.
A good sensor, should have a value around 3F8000

52
• Encoder test
To test the encoder, perform the following test:
screwdriver to
1 2 3 4 5
o The displays are blank
Turn the knob to the right. In the peep display appears a number. This
number increments with each click of the encoder.
Turn the knob to the right. This number decrements with each click of
the encoder
Note: Make sure that in normal operating mode of the Neptune ventilator the
dipswitches of the MMI board, master board and pneumatic board are put
in the following position:
1 2 3 4 5

53
1.4.5 Graphics display
The LCD display is quarter-VGA display. It has a contrast adjustment.
The graphics display excels in a wide range of ambient lighting environments while
effectively eliminating the blooming.
The display consists of a cristal panel and control electronics.
Note: The display generates voltages capable of causing personal injury (high
voltage up to -24 VDC). Do not touch the display electronics during
operation.
The display is connected to connector P5 and P6 of the MMI board.
After switching the ventilator on, the display will respond after a few seconds.

54
1.5 O2 MEASUREMENT
1.5.1 General
The O2 measurement is integrated into the MMI board.
1.5.2 Operation
The oxygen measurement is done with an O2 fuel cell. The oxygen sensor function is
similar to a typical battery. The O2 fuel cell generates a small voltage that is linear
with the oxygen concentration. The output voltage of a new O2 fuel cell is about 15,0
± 2 mV at dry ambient air.
The voltage is converted to a digital value through the 24-bit ADC converter. U2
generates a reference voltage equal to 1,2V used by the ADC converter U1.
LED D1 is lit when the ADC converter is working properly.
• O2 sensor test
To test the O2 sensor, perform the following test:
screwdriver to
1 2 3 4 5
o The display fields plateau, mean and peep are showing a value
A good sensor should have a value around 3F8000

55
1.5.3 O2 Measurement specifications
• Ambient air calibration
Minimum sensor input voltage: ± 4,3 mV
Maximum sensor input voltage: ± 230 mV
• 100% O2 calibration
Minimum sensor input voltage: Ambient air cal. voltage x 4
Maximum sensor input voltage: 1200 mV
• Recommended calibration
Calibrate every 24 hours with ambient air and/or 100% O2.

56
1.6 MASTER BOARD
1.6.1 Block diagram
The block diagram of the master board is represented on the following page.
The master board looks after the communication between the MMI board and the
pneumatic board. The master board contains a reprogrammable microprocessor
(reprogrammable by means of connector P3).
The real time clock keeps up the actual time and date. It contains also timer
information like the total working time of the ventilator, service time, etc.
The audible safety circuit contains a buzzer. The buzzer is driven by the
microprocessor and the reset signal. If an error is detected, the buzzer generates an
audible sound.
The master board is also provided with a RS-232 interface.

57
microprocessor
Ram
memory
Programming
interface
(connector P3)
SPI communication with other boards
(connector P2)
LED indicators
Master board
Real time
clock
RS-232
interface
RS-232 interface
(connector P4)
audible safety
circuit
Block diagram master board

58
The schematic diagram of the master board is represented on the following pages.

59
1 2 3 4
A
B
C
D
4
3
2
1
D
C
B
A
Title
Number Revision
Size
A4
File: C:DOCUMENT..master.sch Drawn By:
PA0(AD0)
51
PA1(AD1)
50
PA2(AD2)
49
PA3(AD3)
48
PA4(AD4)
47
PA5(AD5)
46
PA6(AD6)
45
PA7(AD7)
44
PC0(A8)
35
PC1(A9)
36
PC2(A10)
37
PC3(A11)
38
PC4(A12)
39
PC5(A13)
40
PC6(A14)
41
PC7(A15)
42
PD0(INT0)
25
PD1(INT1)
26
PD2(INT2)
27
PD3(INT3)
28
PD4(IC1)
29
PD5
30
PD6(T1)
31
PD7(T2)
32
PB0(ss)
10
PB1(SCK)
11
PB2(MOSI)
12
PB3(MISO)
13
PB4(OC0/PWM0)
14
PB5(OC1A/PWM1A)
15
PB6(OC1B/PWM1B)
16
PB7(OC2/PWM2)
17
PE0(PDI/RXD)
2
PE1(PDO/TXD)
3
PE2(AC+)
4
PE3(AC-)
5
PE4(INTR4)
6
PE5(INTR5)
7
PE6(INTR6)
8
PE7(INTR7)
9
PF0(ADC0)
61
PF1(ADC1)
60
PF2(ADC2)
59
PF3(ADC3)
58
PF4(ADC4)
57
PF5(ADC5)
56
PF6(ADC6)
55
PF7(ADC7)
54
RD
34
WR
33
XTAL1
24
XTAL2
23
ALE
43
TOSC1
19
TOSC2
18
RESET
20
AREF
62
AGND
63
AVCC
64
PEN
1
VCC
52
GND
22
GND
53
VCC
21
ATmega103L
U1
103L
OC
1
C
11
1D
2
2D
3
3D
4
4D
5
5D
6
6D
7
7D
8
8D
9
1Q
19
2Q
18
3Q
17
4Q
16
5Q
15
6Q
14
7Q
13
8Q
12
U2
74HC573
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
ALE
GND
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
SPI BUS
SPIBUS.sch
RD
WR
A
1
B
2
C
3
E1
4
E2
5
E3
6
Y0
15
Y1
14
Y2
13
Y3
12
Y4
11
Y5
10
Y6
9
Y7
7
U3
74HC138
A15
CS0
CS1
CS2
CS3
CS4
CS5
CS6
CS7
A
1
B
2
C
3
E1
4
E2
5
E3
6
Y0
15
Y1
14
Y2
13
Y3
12
Y4
11
Y5
10
Y6
9
Y7
7
U4
74HC138
SS0
SS1
SS2
SS3
SS4
SS5
SS6
SS7
SS
SS
MOSI
MISO
PB1
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
GND
GND
PF0
PF1
PF2
PF3
PF4
PF5
PF6
PF7
A0
10
A1
9
A2
8
A3
7
A4
6
A5
5
A6
4
A7
3
A8
25
A9
24
A10
21
A11
23
A12
2
A13
26
WR
27
CE
20
OE
22
A14
1
D0
11
D1
12
D2
13
D3
15
D4
16
D5
17
D6
18
D7
19
256
U6
RAM/ROM/FLASH
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A0
10
A1
9
A2
8
A3
7
A4
6
A5
5
A6
4
A7
3
A8
25
A9
24
A10
21
A11
23
A12
2
A13
26
WR
27
CE
20
OE
22
A14
1
D0
11
D1
12
D2
13
D3
15
D4
16
D5
17
D6
18
D7
19
256
U7
RAM/ROM/FLASH
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
0
1 S1
0
1 S2
0
1 S3
0
1 S4
A14
WR A14
WR
CS0
RD RD
CS1
0
1 S5
0
1 S6
X1 4MHZ
GND GND
VCC
PWR
1
X1
2
X2
3
AD0
4
AD1
5
AD2
6
AD3
7
AD4
8
AD5
9
AD6
10
AD7
11
GND
12
CS
13
ALE
14
WR
15
GND
16
RD
17
KS
18
IRQ
19
Vbat
20
RCLR
21
Vbaux
22
SQW
23
VCC
24
U8
DS1685
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
BAT1
LITHIUM 3V
D1
HLMP-1790
R1
1K5
PB7
VCC
MASTER
JP-KDP
R5
100K
R6
100K
R7
100K
R8
100K
VCC
PF7
PF6
PF5
R9
100K
R14
3K9
GND
R10
100K
R15
10K
GND
+12V
+
C3
10µF
GND
+24V
+
C4
10µF
GND
PF0
PF1
GND
+
C5
10µF
C6
100nF
GND
VCC
GND
PB7
VCC
D2
HLMP-1700
R2
1K5
VCC
D3
HLMP-1700
R3
1K5
VCC
D4
HLMP-1700
R4
1K5
VCC
PB4
PB5
PB6
PB4
PB5
PB6
PF4 1
2
3
4
5
10
9
8
7
6
SW1
DS-05 APEM
A
1
B
2
C
3
E1
4
E2
5
E3
6
Y0
15
Y1
14
Y2
13
Y3
12
Y4
11
Y5
10
Y6
9
Y7
7
U5
74HC138
A15
A14
A12
A8
A9
A10
CS8
CS9
CS10
CS11
CS12
CS13
CS14
CS15
CS8
RD
WR
ALE
GND
R11
100K
VCC
VCC
R12
100K
VCC
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
RST
PD0
PD1
PD2
PD3
PD4
PD5
PE4
X2
32.768KHz
GND
C1
33pF
C2
33pF
MASTER012000v1
1 2
v1.0
VCC
1
Vout
2
GND
3
U14
MAX6045AEUR-T
VCC
C20
10nF

60
1 2 3 4
A
B
C
D
4
3
2
1
D
C
B
A
Title
Number Revision
Size
A4
File: C:DOCUMENT..SPIBUS.sch Drawn By:
DE1/RE1
1
DE2/RE2
4
DE3/RE3
5
DR1
2
DR2
3
DR3
6
RO4
7
DI4
8
DE4
9
RE4
10
GND
11
OB4
12
OA4
13
OB3
14
OA3
15
OB2
17
OA2
18
OB1
19
OA1
20
U9
SP495
SS0
MISO
MOSI
SCK
MISOA
MISOB
MOSIA
MOSIB
SCKA
SCKB
SSSLV0A
SSSLV0B
AX
12
AY
13
BX
2
BY
1
CX
5
CY
3
A
11
B
10
C
9
INH
6
O/IA
14
O/IB
15
O/IC
4
U11
74HC4053
RST
PB1
PE1
PE0
PSCK
PMISO
PMOSI
SCK
TPE1
RPE0
GND
VCC
4
MR
3
RST
2
GND
1
U12
max811L
GND
VCC
1 2
3 4
5 6
7 8
9 10
P3
HEADER 5X2
VCC
GND
PSCK
PMISO
PMOSI
C7
100nF
DE1/RE1
1
DE2/RE2
4
DE3/RE3
5
DR1
2
DR2
3
DR3
6
RO4
7
DI4
8
DE4
9
RE4
10
GND
11
OB4
12
OA4
13
OB3
14
OA3
15
OB2
17
OA2
18
OB1
19
OA1
20
U10
SP495
SSSLV1A
SSSLV1B
SSSLV2B
SSSLV3B
SSSLV4B
SSSLV4A
SSSLV3A
SSSLV2A
SS1
SS2
SS3
SS4
VCC
GND
GND
GND
SPIBUS
JP-KDP
R13
100K
VCC
+ C8
0.1µF 16V
+
C9
0.1µF 16V
R1 IN
13
R2 IN
8
T1 IN
11
T2 IN
10
V+
2
V-
6
R1 OUT
12
R2 OUT
9
T1 OUT
14
T2 OUT
7
C1+
1
C1 -
3
C2+
4
C2 -
5
U13
MAX202ECWE
+
C10
0.1µF 16V
VCC
+
C11
0.1µF 16V
GND
TPE1
RPE0
GND GND
MOSIA
MISOA
SCKA
SSSLV0A
SSSLV2A
SSSLV3A
SSSLV4A
MOSIB
MISOB
SCKB
SSSLV0B
SSSLV1B
SSSLV3B
SSSLV2B
SSSLV4B
GND GND
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
P2
HEADER 18X2
R17
5k6
R18
5k6
R19
5K6
R20
5k6
MOSIA
MISOA
SCKA
MOSIB
MISOB
SCKB
R21
5k6
R22
5k6
R23
5k6
SSSLV1A
SSSLV2A
SSSLV3A
SSSLV4A
SSSLV2B
SSSLV3B
SSSLV4B
SSSLV1B
C12
100N
C13
100N
C14
100N
C15
100N
VCC
1 2
3 4
5 6
7 8
9 10
P4
HEADER 5X2
GND
VCC
GND
GND
RST
PE2
PE3
C16
100N
C17
100N
VCC
GND
+12V
GND
GND
VCC
+24V
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
P1
HEADER 18X2
GND
C18
100N
+ C21
22µF
+ C22
22µF C19
100N
GND GND
VCC
GND
+12V
GND
C24
100N
C25
100N
VCC
GND
C26
100N
C27
100N
VCC
GND
SSSLV1A
MAS012000v1 v1.0
2 2
R24
5k6
SSSLV0A SSSLV0B
BUZ1
GND
Q1
BS170M
Q2
BS170M
Q3
BS170M
+12V
R25
10K
C28
100N
GND GND
RST
R27
1K
GND GND GND
C29
100N
R26
100K
PD7
D6
1N4148
VCC
D7
1N4148

Neptune ventilator - 61 - Technical manual
1.6.3 Build-in test software
After turning the ventilator on, the master board will test all his different functions.
During start-up the following tests are executed:
ƒ test the timers
ƒ test EEPROM memory
ƒ test Watchdog
o Microprocessor external functions test
ƒ test external RS-232
ƒ test external real time clock
o Microprocessor communication test
ƒ test the communication between master board and display
board
ƒ test the communication between master board and pneumatic
board
When all these tests are executed successfully, the master board is ready to start
G R R R
After start-up the LED indicators can show the following errors:
G R R R
G R R R
G R R R
G R R R
Communication error

To determine the exact error on the master board, you have to perform a specific test
by using the build-in test software.
Note: During executing a specific test on the master board there will be no
communication between the master board and the display board. The
MMI board will interpret this as a communication error and a
communication error code is displayed and also an alarm sound is
audible. This can be very annoying. To prevent this error put the MMI
board in internal test mode by setting dipswitch 1 high. See the MMI
board section in this manual for detailed instructions.
Note: The pneumatic board will also detect a communication error during a
executing a specific test on the master board. Don’t pay any attention
to it in this situation.
follow:
o Remove the upper cover plate at the back of the Neptune.
screwdriver to
1 2 3 4 5
o If no errors where found, all the red LED’s are off and the green LED
is blinking.
o If an error is detected, the error is indicated on the red error LED’s and
the next page:

Error LED’s Error code Description
G R R R
G R R R
1 internal PROGRAM MEMORY error
G R R R
G R R R
G R R R
G R R R
G R R R
6 Reserved
G R R R
7 Reserved

# Resolve internal function test error code 4 – Internal EEPROM error
To fix error code 4 or internal EEPROM error follow the next steps:
o Turn the Neptune ventilator off.
screwdriver to
1 2 3 4 5
means that the master board EEPROM settings are restored to the
factory settings.
o Turn the ventilator off
previous page. If the EEPROM error still remains contact an
authorized service engineer.
Note: Restoring the master EEPROM settings will not affect the pneumatic
board EEPROM settings. Calibration of the ventilator is not needed in
this case.
Warning: Try to resolve internal function error code 4 (EEPROM error)
with the instructions described above. For all other internal
function test errors contact an authorized service engineer.

follow:
screwdriver to
1 2 3 4 5
is blinking.
the next page:

G R R R
G R R R
1 reserved
G R R R
2 reserved
G R R R
3 reserved
G R R R
4 External REAL TIME CLOCK error
G R R R
5 reserved
G R R R
6 reserved
G R R R
7 reserved
function test is repeated. It’s not necessary to turn the ventilator on and
off to repeat the external function test.

# Resolve external function test error code 4 – External real time clock error
There is a problem with the real time clock. Device U8 contains the actual time and
date and timer information. The microprocessor can send data or read data from
device U8. Device U8 is equipped with a very accurate crystal and a backup battery.
If the test is running correctly the buzzer is set on and off every second.
Communication test between master board and MMI board
To test the communication between the master board and the MMI board perform the
following test:
screwdriver to
1 2 3 4 5
screwdriver to
1 2 3 4 5

Communication test between master board and pneumatic board
To test the communication between the master board and the pneumatic board
perform the following test:
screwdriver to
1 2 3 4 5
o Change the dipswitch setting of the pneumatic board with a small
screwdriver to
1 2 3 4 5
o Turn the ventilator on.
• LED indicator test
To test the error LED indicators perform the following test:
screwdriver to
1 2 3 4 5
o The error LED’s are blinking one by one.

1.6.4 Master board layout

1.7 PNEUMATIC BOARD
1.7.1 Block diagram
The block diagram of the pneumatic board is represented on the following page.
The pneumatic board is provided with one microprocessor. The microprocessor is re-
programmable by means of connector P3.
The A/D converter converts the signal of the pressure transducer, the +12V valves
voltage and the +12V voltage to a digital value.
There are two valve driver IC’s that can drive each 8 valves. Each output is provided
with a green LED. You can see the valve state directly on the LED’s. Connectors P4
and P5 connecting the valve driver IC’s with the valves.
The pneumatic microprocessor receives settings from the MMI board. On the basis of
these settings and the signals from the transducers the microprocessor is calculating
all the parameters needed to drive the pneumatic valves.
The microprocessor must trigger the 12V safety circuit in a certain time. During a
microprocessor failure the +12V safety circuit will not be triggered and the +12V
voltage on the valves shuts off. The ventilator switches automatically over to MAN.
mode in this situation (because no valves are driven).

microprocessor
RAM
memory
A/D converter
PTR1
Patient
pressure
Programming
interface
(connector P3)
SPI communication with master board
(connector P2)
LED indicators
Pneumatic board
PTR2
Peep valve
exp.pressure
PTR3
Patient flow
PTR4
freshgas
PTR5
Tank pressure
PTR6
Peep valve
insp. pressure
Valve driver 2
Valve driver 1
12V
SAFTY
CIRCUIT
Connector P4 Connector P5
LED Indicators
LED Indicators
12v valve 12v
Connector P6
Input switches
Block diagram pneumatic board

The schematic diagram of the pneumatic board is represented on the following pages.

1 2 3 4
A
B
C
D
4
3
2
1
D
C
B
A
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PA0(AD0)
51
PA1(AD1)
50
PA2(AD2)
49
PA3(AD3)
48
PA4(AD4)
47
PA5(AD5)
46
PA6(AD6)
45
PA7(AD7)
44
PC0(A8)
35
PC1(A9)
36
PC2(A10)
37
PC3(A11)
38
PC4(A12)
39
PC5(A13)
40
PC6(A14)
41
PC7(A15)
42
PD0(INT0)
25
PD1(INT1)
26
PD2(INT2)
27
PD3(INT3)
28
PD4(IC1)
29
PD5
30
PD6(T1)
31
PD7(T2)
32
PB0(ss)
10
PB1(SCK)
11
PB2(MOSI)
12
PB3(MISO)
13
PB4(OC0/PWM0)
14
PB5(OC1A/PWM1A)
15
PB6(OC1B/PWM1B)
16
PB7(OC2/PWM2)
17
PE0(PDI/RXD)
2
PE1(PDO/TXD)
3
PE2(AC+)
4
PE3(AC-)
5
PE4(INTR4)
6
PE5(INTR5)
7
PE6(INTR6)
8
PE7(INTR7)
9
PF0(ADC0)
61
PF1(ADC1)
60
PF2(ADC2)
59
PF3(ADC3)
58
PF4(ADC4)
57
PF5(ADC5)
56
PF6(ADC6)
55
PF7(ADC7)
54
RD
34
WR
33
XTAL1
24
XTAL2
23
ALE
43
TOSC1
19
TOSC2
18
RESET
20
AREF
62
AGND
63
AVCC
64
PEN
1
VCC
52
GND
22
GND
53
VCC
21
ATmega103L
U1
ATMEGA103
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
VALVES
VALVES.sch
A8
A9
A10
A11
A12
A13
A14
A15
SENSORS
SENSORS.sch
RD
WR
RS485 DRIVER
PNEUSPI.sch
OC
1
C
11
1D
2
2D
3
3D
4
4D
5
5D
6
6D
7
7D
8
8D
9
1Q
19
2Q
18
3Q
17
4Q
16
5Q
15
6Q
14
7Q
13
8Q
12
U2
74HC573
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
GND
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A7
A13
A14
A
1
B
2
C
3
E1
4
E2
5
E3
6
Y0
15
Y1
14
Y2
13
Y3
12
Y4
11
Y5
10
Y6
9
Y7
7
U3
74HC138
A4
$100*
$107*
A5
A6
A15
A12
1
2
8
9
U4A
74HC4075
3
4
5
6
U4B
74HC4075
11
12
13
10
U4C
74HC4075
CS0
CS1
CS2
CS3
CS4
CS5
CS6
CS7
A0
10
A1
9
A2
8
A3
7
A4
6
A5
5
A6
4
A7
3
A8
25
A9
24
A10
21
A11
23
A12
2
A13
26
WR
27
CE
20
OE
22
A14
1
D0
11
D1
12
D2
13
D3
15
D4
16
D5
17
D6
18
D7
19
256
U5
RAM/ROM/FLASH
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
0
1 S1
0
1 S2
A14
WR
RD
0
1 S3
0
1 S4
A15
A14
WR
1
2
3
U6A
74HC02
4
5
6
U6B
74HC02
8
9
10
U6C
74HC02
WR
WR
CS0
CS1
VALSEL1
VALSEL2
PF0
PF1
PF2
PF3
PF4
PF5
PF6
PF7
RST
PE1
PE0
MISO
MOSI
PB1
SS
VAL.CL
12V ON/OFF
PD3
PD4
PD5
PD6
PD7
VAL.EN.
GND GND
PNEUMATIC
JP-KDP
R1
100K
R2
100K
R3
100K
R4
100K
PF7
PF6
PF5
VCC
D4
HLMP-1700
R5
1K5
PB4
D3
HLMP-1700
R6
1K5
D2
HLMP-1700
R7
1K5
D1
HLMP-1790
R8
1K5
PB7
PB6
PB5
GND
PF4
VCC
GND
GND
VCC
PB4
PB5
PB6
PB7
VCC
R16
100R
GND
ADINT
X1 6MHz
1
2
3
4
5
10
9
8
7
6
SW1
DS-05 APEM
C3
100N
C1
33pF
C2
33pF
PNEU012000v1 v1.0
1 4

1 2 3 4
A
B
C
D
4
3
2
1
D
C
B
A
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A4
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AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
P4
HEADER 10X2
V1
V2
V3
V4
V5
V6
V7
V8
D5 D6 D7 D8 D9 D10 D11 D12
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
R17
8*4K7
VCC
GND
VAL.CL
VALSEL1
VAL.EN.
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
P5
HEADER 10X2
V9
V10
V11
V12
V13
V14
V15
V16
D13 D14 D15 D16 D17 D18 D19 D20
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
R18
8*4K7
VCC
GND
VAL.CL
VALSEL2
VAL.EN.
D1
2
D2
3
D3
4
D4
5
D5
6
D6
7
D7
8
D8
9
Q1
18
Q2
17
Q3
16
Q4
15
Q5
14
Q6
13
Q7
12
Q8
11
E1
1
E2
19
U7
74HC541
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
R19
8*100K
VCC
GND
RD
Q1
RFP30P05
+12v
Q2
BS170M
GND
12V
ON/OFF
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
VCC
GND
CS2
VALVES
JP-KDP
A
1
B
2
CLR
3
Q
4
Q
13
Cext
14
RCext
15
U8A
74HC123
RST
GND
VCC
12v val.
C21
100nF
C22
100nF
C23
100nF
C24
100nF
R20
100K
A
9
B
10
CLR
11
Q
12
Q
5
Cext
6
RCext
7
U8B
74HC123
GND
COM
12
OUT8
13
OUT7
14
OUT6
15
OUT5
16
OUT4
17
OUT3
18
OUT2
19
OUT1
20
VDD
21
OE
22
CLEAR
1
IN1
3
STROBE
2
INT2
4
INT3
5
INT4
6
INT5
7
INT6
8
INT7
9
INT8
10
GND
11
MIC5801BN
U9
MIC5801BN
COM
12
OUT8
13
OUT7
14
OUT6
15
OUT5
16
OUT4
17
OUT3
18
OUT2
19
OUT1
20
VDD
21
OE
22
CLEAR
1
IN1
3
STROBE
2
INT2
4
INT3
5
INT4
6
INT5
7
INT6
8
INT7
9
INT8
10
GND
11
MIC5801BN
U10
MIC5801BN
D21 R29
4K7
GND
1 2
3 4
5 6
7 8
9 10
P6
HEADER 5X2
PNEU012000v1 v1.0
R30
22K
R9
10K
C20
330N
2 4

1 2 3 4
A
B
C
D
4
3
2
1
D
C
B
A
Title
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Size
A4
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AGND
15
CH0
16
CH1
17
CH2
18
CH3
19
CH4
20
CH5
21
CH6
22
CH7
23
INT
24
REFADJ
25
REF
26
VDD
27
DGND
28
CLK
1
CS
2
WR
3
RD
4
HBEN
5
SHDN
6
D7
7
D6
8
D5
9
D4
10
D3/D11
11
D2/D10
12
D1/D9
13
D0/D8
14
MAX197
U11
MAX197
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
C26
100pF
AGND
WR
RD
A0
CS3
VCC
ADINT
AGND
C27
0.01µF
AGND
AGND
SENSORS
JP-KDP
Vref COM
12
Vref BG
13
Vref 2.5
14
Vref 5
15
Vref 10
16
Vref Out
4
V+in
6
RG
9
RG
8
V-in
7
v-
3
v+
1
sleep
2
Vo
10
SENSE
11
IAref
5
U12 INA125
VO-
1
-Vexc
2
VO+
3
+Vexc
4 PTR1
SM5652-015-G-3-L
3
2
6
7
4
U18
OPA237
R10
RES1
AGND
AGND
Vref COM
12
Vref BG
13
Vref 2.5
14
Vref 5
15
Vref 10
16
Vref Out
4
V+in
6
RG
9
RG
8
V-in
7
v-
3
v+
1
sleep
2
Vo
10
SENSE
11
IAref
5
U13 INA125
VO-
1
-Vexc
2
VO+
3
+Vexc
4 PTR2
SM5652-015-G-3-L
3
2
6
7
4
U19
OPA237
R11
RES1
AGND
AGND
Vref COM
12
Vref BG
13
Vref 2.5
14
Vref 5
15
Vref 10
16
Vref Out
4
V+in
6
RG
9
RG
8
V-in
7
v-
3
v+
1
sleep
2
Vo
10
SENSE
11
IAref
5
U14 INA125
VO-
1
-Vexc
2
VO+
3
+Vexc
4 PTR3
SM5652-003-D-3-L
3
2
6
7
4
U20
OPA237
R12
RES1
AGND
AGND
Vref COM
12
Vref BG
13
Vref 2.5
14
Vref 5
15
Vref 10
16
Vref Out
4
V+in
6
RG
9
RG
8
V-in
7
v-
3
v+
1
sleep
2
Vo
10
SENSE
11
IAref
5
U15 INA125
VO-
1
-Vexc
2
VO+
3
+Vexc
4
PTR4
SM5652-003-D-3-L
3
2
6
7
4
U21
OPA237
R13
RES1
AGND
AGND
Vref COM
12
Vref BG
13
Vref 2.5
14
Vref 5
15
Vref 10
16
Vref Out
4
V+in
6
RG
9
RG
8
V-in
7
v-
3
v+
1
sleep
2
Vo
10
SENSE
11
IAref
5
U16 INA125
VO-
1
-Vexc
2
VO+
3
+Vexc
4 PTR5
SM5612-030-G-3-L
3
2
6
7
4
U22
OPA237
R14
RES1
AGND
AGND
+12v SENSORS
CH0
CH1
CH2
CH3
CH4
PATIENT PRESSURE PATIENT FLOW
PEEP VALVE EXP. PRESSURE FRESH GAS FLOW TANK PRESSURE
Vref COM
12
Vref BG
13
Vref 2.5
14
Vref 5
15
Vref 10
16
Vref Out
4
V+in
6
RG
9
RG
8
V-in
7
v-
3
v+
1
sleep
2
Vo
10
SENSE
11
IAref
5
U17 INA125
VO-
1
-Vexc
2
VO+
3
+Vexc
4 PTR6
SM5652-015-G-3-L
3
2
6
7
4
U23
OPA237
R15
RES1
AGND
AGND
+12v SENSORS
CH5
PEEP VALVE INSP. PRESSURE
R21
100K
R23
10K
AGND
+12v
CH6
AGND
AGND
R22
100K
R24
10K
AGND
CH7
12v
val.
+
C28
22µF/35v
+
C29
47µF
+
C30
47µF
C4
100N
C5
100N
C6
100N
C7
100N
C8
100N
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
VCC
PNEU012000v1
3 4
v1.0
C34
100N
C35
100N
C36
100N
C37
100N
C40
100N
C43
100N
C46
100N
C38
100N
C39
100N
C41
100N
C42
100N
C44
100N
C45
100N
C47
100N
C48
100N
C49
100N
C11
100N
C33
100N
L1
22µH
C19
100N
AGND
+12v SENSORS +12v
R31 10
C18
100N
AGND

1 2 3 4
A
B
C
D
4
3
2
1
D
C
B
A
Title
Number Revision
Size
A4
File: C:DOCUMENT..PNEUSPI.sch Drawn By:
DE1/RE1
1
DE2/RE2
4
DE3/RE3
5
DR1
2
DR2
3
DR3
6
RO4
7
DI4
8
DE4
9
RE4
10
GND
11
OB4
12
OA4
13
OB3
14
OA3
15
OB2
17
OA2
18
OB1
19
OA1
20
U24
SP495
SS
SS
MISO
MISO
MOSI
SCK
MISOA
MISOB
MOSIA
MOSIB
SCKA
SCKB
SSSLV0A
SSSLV0B
GND
AX
12
AY
13
BX
2
BY
1
CX
5
CY
3
A
11
B
10
C
9
INH
6
O/IA
14
O/IB
15
O/IC
4
U25
74HC4053
RST
PB1
PE1
PE0
PSCK
PMOSI
SCK
PMISO
GND
VCC
4
MR
3
RST
2
GND
1
U26
max811L
GND
VCC
1 2
3 4
5 6
7 8
9 10
P3
HEADER 5X2
VCC
GND
PSCK
PMISO
PMOSI
GND
RST
PNEUMATIC SPI
JP-KDP
1
2
3
U27A
74HC00
GND
C25
100nF
+12V
GND
GND
VCC
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
P1
HEADER 18X2
GND
C9
100N
+ C31
22µF
+ C32
22µF/35v
C10
100N
GND GND
VCC
GND
+12V
GND
MOSIA
MISOA
SCKA
SSSLV0A
MOSIB
MISOB
SCKB
SSSLV0B
GND GND
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
P2
HEADER 18X2
R25
5K6
R26
5K6
R27
5K6
R28
5K6
MOSIA
MISOA
SCKA
MOSIB
MISOB
SCKB
SSSLV0A SSSLV0B
4
5
6
U27B
74HC00
9
10
8
U27C
74HC00
12
13
11
U27D
74HC00
GND GND GND
C12
100N
C13
100N
C14
100N
C15
100N
C16
100N
C17
100N
VCC
GND
PNEU012000v1
4 4
v1.0

77
1.7.3 Build-in test software
• Start-up test
After turning the ventilator on, the pneumatic board will test all his different
functions. During start-up the following tests are executed:
ƒ test the timers
ƒ test EEPROM memory
ƒ test Watchdog
o Microprocessor external functions test
ƒ test external 12V safety valve
ƒ test external A/D converter
o Microprocessor communication test
ƒ test the communication between pneumatic board and master
board
When all these tests are executed successfully, the MMI board is ready to start
G R R R
After start-up the LED indicators can show the following errors:
G R R R
G R R R
G R R R
G R R R
Communication error

78
To determine the exact error on the pneumatic board, you have to perform a specific
test by using the build-in test software.
Note: During executing a specific test on the pneumatic board there will be
no communication between the master board and the pneumatic board.
The master board will interpret this as a communication error and a
continuous beep is audible. This can be very annoying. To prevent this
error put the master board in internal test mode by setting dipswitch 1
high. See the master board section later in this manual for detailed
instructions.
Note: The MMI board will also detect a communication error during a
executing a specific test on the pneumatic board. To prevent this error
put the MMI board in internal test mode by setting dipswitch 1 high.
See the MMI board section in this manual for detailed instructions.
follow:
screwdriver to
1 2 3 4 5
is blinking.
the next page:

79
G R R R
G R R R
1 internal PROGRAM MEMORY error
G R R R
G R R R
G R R R
G R R R
G R R R
6 Reserved
G R R R
7 Reserved

80
# Resolve internal function test error code 4 – Internal EEPROM error
To fix error code 4 or internal EEPROM error follow the next steps:
screwdriver to
1 2 3 4 5
means that the pneumatic board EEPROM settings are reset.
Turn the ventilator off
previous page. If the EEPROM error still remains contact an
authorized service engineer.
Warning: Reset from the pneumatic board EEPROM settings will AFFECT
the calibration parameters. Recalibration of the ventilator is
necessary in this case. Refer to the maintenance and calibration
procedure described later in this manual!

81
follow:
screwdriver to
1 2 3 4 5
is blinking.
the next page:

82
G R R R
G R R R
1 reserved
G R R R
2 External SRAM error
G R R R
3 reserved
G R R R
4 reserved
G R R R
5 reserved
G R R R
6 reserved
G R R R
7 reserved
function test is repeated. It’s not necessary to turn the ventilator on and
off to repeat the external function test.

83
# Resolve external function test error code 2 – External SRAM error
There is a problem with the external SRAM memory. The external SRAM memory is
located on socket U5 on the pneumatic board. The microprocessor is reading data
from and writing data to the external SRAM memory.
• Pneumatic function test
You can test all the pneumatic functions of the pneumatic board as follow:
screwdriver to
1 2 3 4 5
is blinking. Each valve of each valve driver is driven one by one.
the next page:

84
PNEUMATIC FUNCTION TEST ERROR CODES
G R R R
G R R R
1 Not able to start A/D converter
G R R R
2 A/D converter busy
G R R R
3 All A/D converter readings = $FFF
G R R R
4 All A/D converter readings = $000
G R R R
5 Not able to switch 12V safety circuit
OFF within 20 ms
G R R R
6 Not able to switch 12V safety circuit
ON within 20 ms
G R R R
7 No +12V input or +12V input too low

85
1.7.4 Pneumatic board layout

86
2. PNEUMATIC SYSTEM
2.1 PNEUMATIC DIAGRAM
The pneumatic diagram of the Neptune ventilator is represented on the next page.

87

88
2.2 MANUAL / SPONTANEOUS MODE (MAN)
If the Neptune is set to Man/Spont mode, the hand balloon is connected through the
patient breathing circuit and absorber to the patient. Squeezing the manual bag will
initiate an inspiration phase. The CO2 is removed by the soda lime in the canister.
Mixed gas from hand balloon and fresh gas flow goes directly to the patient. During
this phase, with the ventilator switched to Man/Spont mode, the patient pressure is
monitored and shown on the display.
If the patient pressure exceeds the upper limit pressure setting, an audible and visual
alarm is set. In this mode, the safety valve on the manual bag will guarantee the
maximum pressure level that can be set.
Man/Spont INSPIRATION

89
Releasing the hand balloon will initiate an expiration phase. The patient can breath
out. At the end of the expiration, parameters like PEEP, frequency, PIP and tidal
volume are calculated and shown on the display.
Man/Spont EXPIRATION

90
2.3 CONTROLLED MANDATORY VENTILATION (CMV)
The system is built around the so-called "bag in bottle principle". The figure on the
next page represents the inspiration and expiration phase in CMV mode.
Tank T is filled with an initial pressure calculated by the pneumatic microprocessor.
The initial pressure is calculated on the basis of an algorithm comprising the
following parameters:
o Fresh gas flow
o Total circuit resistance
o Patient compliance
o Hose system compliance
o Frequency
o I/E ratio
o Tidal volume
o PEEP
o Leakage
The contents of tank T flows into the bottle during inspiration, so that a pressure rise
will occur in it, and this will compress the bag.
The gas flows via the MAN/CMV valve, flow sensor and absorber to the patient.
During inspiration, the gas is routed through the soda lime.
The patient pressure is shown on the barograph or on the graphic.
During inspiration, the PEEP/upper limit pressure valve will contain the set upper
limit pressure. As soon as the patient pressure exceeds this limit, gas will be
evacuated from the patient circuit.
CMV INSPIRATION

91
During expiration, the patient breathes out into the bag via the soda lime in the
absorber, the flow sensor and the MAN/CMV valve. The bottle venting valve is open,
causing the pressure in the bottle to become equal to atmospheric pressure.
If the fresh gas flow is higher than the consumption by the patient or leakage, as
appropriate, the system would become overfilled. This is prevented by the evacuation
of the surplus gas via the PEEP/upper limit valve (X6).
CMV EXPIRATION

92
2.4 PRESSURE CONTROLLED VENTILATION (PCV)
In PCV mode the ventilator has to deliver the set peak pressure.
At the start of inspiration the tank who is filled during last expiration is connected with
bottle. This gives a decelerating flow, high at the start that comes to zero when the peak
level is reached.
V7 and V8 are used to give extra flow to keep the pressure at same level.
For a smooth regulation activation from this valves is done in ‘PWM’ pulse wide
modulation .
V1,V2,V14,V15&V16 are used to open the bottle and keep the pressure at peak level.
During the inspiration time ,the electronics will measure the patient pressure. If the
pressure is not within limits a calculation is done to adjust the tank pressure setting for
the next inspiration.. If the patient pressure becomes higher than the set peak pressure
+5hPa/+5mbar, valve V13 will be set in expiration position, the amount of pressure that
is too much can escape via the evacuation. When the patient pressure is within limits,
valve V13 will be set in inspiration position.
Each time valve V13 switches during inspiration the pressure in reservoir upper limit
becomes lower.” The start pressure is 100hPa/100mbar”.
During the expiration the exhaled patient flow is measured and tidal volume is
calculated.
If the PEEP (positive end expiration pressure) is higher than the set PEEP +
20hPa/+20mbar, the ventilator goes in Man/Spont mode and an error message is shown
on display.

93
PCV EXPIRATION
PCV INSPIRATION

94
2.5 PEEP
During expiration and a PEEP is set, a certain pressure is set behind the PEEP
valve X6. This pressure is derived from the X6 back pressure during inspiration.
At the start op expiration valve V13 is set to expiration mode.
With a PEEP set, valve V9 is always on. Valve 10 is off for a certain time, during this
time the back pressure from valve X6 can escape rapidly, to create the best expiration
situation. Valve V10 is switched on after a certain time to load the PEEP reservoir with
pressure.
The time that valve V10 is switched on is calculated at the end of expiration, this time
will be shorter for higher PEEP level and longer for lower PEEP level.
PEEP regulation is the same for CMV and PCV mode.
2.6 Flush safety
There is a detection when an oxygen flush is generated to prevent high pressure if the
upper limit was set too high.
The Max pressure allowed during an O2 flush is last peak pressure +20hPa / +20mbar,
If the volume was stable and when this level (last pip +20 is below upper limit setting).
When the upper limit alarm is lower ,the upper limit alarm level is used.
The min level is 30hPa / 30mbar if upper limit is higher.
When the upper limit alarm level is lower then the calculated safety, the upper limit
alarm level has priority.

95
2.7 MECHANICAL CONSTRUCTION
2.7.1 Patient breathing unit
There are four main parts in the patient unit that need to be distinguished:
o PEEP and upper limit pressure valve
o MAN/CMV switching valve
o Flow sensor
o Latex free autoclavable bag
PEEP and upper limit
pressure valve
MAN/CMV
switching valve
Flow sensor

96
● PEEP and upper limit pressure valve
Regulation of the PEEP and upper limit pressure is provided by the mushroom valve (C)
which operates a plastic valve (D).
During inspiration, the value set for the upper limit pressure is applied to the mushroom
valve causing this to expand and thus exert the same pressure on the plastic valve.
When a pressure higher than the upper limit pressure is built up on the underside, the
valve will be lifted and gas is able to escape via the evacuation. The plastic valve
ensures that the pressure is uniformly distributed so that the noise made by the escaping
air is attenuated.
During expiration, the value set for the PEEP is applied to the mushroom valve. The
exhalation curve thus approaches the PEEP gradually. There are no sudden transitions,
which results in a “smoothed shape”.
The upper limit pressure thus ensures that the patient is not exposed to too high
pressures during inspiration, while the PEEP ensures - when expiration occurs - that
sufficient pressure remains in the lung. This is only applicable in CMV and PCV mode.
Latex free autoclavable bag
C
D

97
● MAN/CMV switching valve
The changeover valve is always in the unpowered state in the Man/Spont mode. The
valve (G) is in fact pressed up by a spring so that the absorber is connected directly to
the hand balloon. If the ventilator mode is changed to CMV or PCV, pressure reaches
the switching diaphragm via connection E. The valve is thereby pressed down and the
hand balloon shut off. When this occurs, the connection to the bag (F) is opened so that
the absorber is now connected to the bag.
G
E
F

98
● Flow sensor
The flow sensor is a derivative, developed by Medec Benelux NV, of the well- known
Fleisch principle. To ensure laminar flow, special perforated rings are fitted. The flow
sensor can measure flow up to 96 l/min.
Differential pressure (∆P) is measured across the restriction by means of connections A
and B, which are connected to transducer TRX3.
● Latex free autoclavable bag
The bag is connected to the connection F intended for this purpose. It should be clearly
understood that in the unpowered state (i.e. in the Man/Spont mode), the bag is not used.
The bag is a special balloon and therefore cannot be replaced with a different type of
balloon.
Warning: Medec Benelux NV can only guarantee correct ventilator operation
with the same type of balloon.

99
2.7.2 Bottle
The feed-through plate of the bottle is provided with five connections. This plate ensures
a gas-tight connection between the bottle and the patient breathing unit. This makes the
patient breathing unit easy to remove and to clean.
A. MAN/CMV switching valve.
B. PEEP and upper limit pressure valve.
C. Outlet for gas evacuation from the mushroom valve.
D. Measurement point, flow sensor positive.
E. Measurement point, flow sensor negative and patient pressure.
The bag is inserted in the bottle after which the patient breathing unit is attached to the
bottle by means of the whale clip.
The bottle is manufactured from aluminum. On the back of the bottle, there are two
valves:
o The bottle safety valve located on the top is adjusted to
120hPa/120mbar. So the pressure in the bottle (and thus also in the
patients lung) never exceeds this value.
o The bottle venting valve located on the bottom ensures that during
inspiration, the bottle is shut off from the outside air so that the bag can
be compressed. During expiration, this valve ensures that the bottle is
vented, so that the bag can be filled again with the expired gas from the
patient.
A
B
C
D
E

100
bottle safety valve
bottle venting valve
V12
V13
V1
V2
V14
V15
V16
V9
V10
V11
V3
X3
V7
V9
V6
V5
V8
X2

101
2.7.3 Supply tank
The supply tank T (contents = 1,2 liter) provides the inspiration stroke volume.
The tank is located around the bottle.
The tank can be filled with the use of two low flow valves or one high flow valve.
There’s another valve provided to connect the tank with the bottle.
The supply tank T
Bottle

102
2.7.4 Solenoid valves
The solenoid valves are special maintenance-free low-power valves. Because of the
special design, in which there is no sliding core but a corrosion-resistant metal
diaphragm, the valve processes a number of unique properties.
The ring which connects the coil and the valve housing may be unscrewed one turn in
order to attend to the electrical connections. Never unscrew the ring entirely, to prevent
vital parts being lost or damaged.
Note: Never change the order of diaphragm and spacer ring, since these are
specially calibrated.

103
3. MAINTENANCE AND CALIBRATION
The aim of the maintenance and calibration procedure is to ensure proper and safe
working of the Neptune ventilator. It must be performed by a qualified service engineer
every 6 months. Always recalibrate the ventilator and execute a leaktest after replacing a
component.
3.1 VISUAL INSPECTION
Remove the cover plate of the Neptune ventilator.
• Electronic system
1 Ensure that all the boards of the extendable system set are mounted
correctly.
1 Check that all electrical connectors are latched.
1 Check all keyboard board switches for proper working
1 Check control knob switch and rotation for proper working
• Pneumatic
1 Make sure that all tubes are properly connected and none are kinked or
pinched.
1 Check the clear tubing for signs of water. If any is detected, replace the
tubing or blow out the water by means of compressed air.
1 Check the air input water trap. Any presence of water must be
removed by pressing the bottom pin of the water trap. Make sure that
no water is flowing away into the ventilator.
1 Check the patient breathing system, the absorber and all external
tubing.

104
3.2 BATTERY BACKUP
The ventilator can work for at least 1 hour on battery when fully charged. Connect the
ventilator for a couple of hours to the AC mains supply to assure a fully charged battery.
Check the ventilator battery backup by means of the following instructions:
o Connect the power cord to the AC mains inlet
o Turn the AC mains switch at the back of the ventilator ON
o Turn the ventilator ON
o There is a mains plug drawn at the top of the display which means that
the ventilator is working on AC mains supply
o Set the ventilator to CMV mode
o Check the battery backup by pulling the mains plug
o There is a battery drawn at the top of the display which means that the
ventilator is working on battery
If the ventilator shuts off in less than 1 hour, replace the battery by a new one. We
recommend replacing the battery every 3 years. Always replace the battery with the
same type and ratings.
Note: The battery does not require maintenance under normal
circumstances. Always replace with same type every three years.

105
3.3 THE CALIBRATION MENU
Enter the calibration menu as follows:
o Turn the ventilator ON
o Go to the Info menu
o Press the buttons in the exact order as represented:
1
2
3
4
5

106
The calibration menu looks as follows:
1. Control buttons: with these buttons you can change the calibration settings,
drive the +12 voltage of the valves, set valves on and off, etc.
2. Exit button: you can leave the calibration menu by pressing the exit button. The
changes made in the calibration menu are stored to the EEPROM memory of the
pneumatic board.
3. Input indicators: the input pressure switches, connected to connector P6 on the
pneumatic board, are indicated over here. INPUT1 is connected to the air input
pressure switch, INPUT2 is connected to the O2 input pressure switch and
INPUT6 is connected to the N2O input pressure switch.
INPUT3, INPUT4, INPUT5, INPUT7 and INPUT8 are not used.
4. Valve ON/OFF: you can set each valve individually ON and OFF.
5. +12V VALVES: you can turn the +12V voltage of the valves ON and OFF.
Make sure that you set the +12V VALVES voltage on when you are testing each
valve individually. The ADC reading value is the value that the analog / digital
converter (ADC), located on the pneumatic board, indicates during converting
the +12V VALVES voltage to a digital value.
6. +12V SUPPLY: over here you can see a read-out of the digital value of the
+12V supply generated by the ADC converter. The +12V supply must always be
present after turning the ventilator on.
7. Selection beam: you can scroll the selection beam through the calibration menu
by rotating the control knob. The function of the control buttons at the left is
depending on the position of the selection beam.
8. Pressure transducers: each pressure transducer (TRX) can be calibrated
individually. TRX1 measures the airway pressure, TRX2 measures the PEEP
pressure, TRX3 measures the patient flow located in the patient breathing unit,
1
2 3
4
5
7
8
9
6

107
TRX4 measures the fresh gas flow, TRX5 measures the tank pressure and TRX6
measures the upper limit pressure.
9. Service time: the service time is used to check the time between the last
maintenance and now. The service engineer has the possibility to zero this
service time after the maintenance and calibration procedure is executed. The
service timer is always running when the ventilator is on, regardless of standby
mode, manual mode, PCV or CMV mode.

108
3.4 THE PRESSURE TRANSDUCERS
Zeroing the pressure transducer TRX1, TRX2, TRX5 and TRX6
o Disconnect patient breathing unit.
o Close fresh gas.
o Activate valve V5 to discharge the tank.
o Move the selection beam to transducer TRX1.
o Press the zero button.
o Transducer TRX1 is now zeroed.
o Repeat the 3 previous instructions for zeroing transducer TRX2, TRX5
and TRX6.
Zeroing the pressure transducer TRX3 and TRX4
Warning: A zero and/or max. calibration of transducer TRX3 and/or TRX4
will erase the previous GAIN setting of the transducer. Make a note
of these GAIN setting (they can be used later) before starting any
zero or Max calibration transducer TRX3 and TRX4.
The pressure transducer TRX3 and TRX4 are used to measure flow. They measure the
differential pressure across the flow sensor. The pneumatic microprocessor uses a look-
up table of the sensor to convert differential pressure to flow (liter/minute). There can be
a very small deviation between the look-up table and the flow sensor. You can eliminate
this deviation by adjusting the GAIN of the selected pressure transducer (only applicable
TRX1
TRX2
TRX3
TRX4
TRX5
TRX6
1
2
3
4
5
6
+
+
- -

109
on TRX3 and TRX4). You need a calibrated flow meter to compare the adjusted flow in
the calibration menu with the reference flow measured.
Warning: A zero and/or max. calibration of transducer TRX3 and/or TRX4
will erase the previous GAIN setting of the transducer. Adjustment
of the GAIN is necessary to eliminate the deviation again.
o Be sure that the fresh gas is closed.
NOTE: It is not necessary to open the ventilator to do the zeroing TRX3.
Be sure that patient breathing unit is disconnected.
NOTE: Set back the factory setting from TRX3 where you have made a note
from when only a zeroing from TRX3 is necessary.
When also a Max calibration will be done, restore of factory gain you
have to do after the Max calibration.
NOTE: It is not necessary to open the ventilator to do the zeroing TRX4.
Be sure that patient breathing unit is disconnected.
o Set a fresh flow of 0,3 liters/min.
o Close the fresh gas flow.
NOTE: Set back the factory setting from TRX4 where you have made a note
from when only a zeroing from TRX4 is necessary.
When also a Max calibration will be done, restore of factory gain you
have to do after the Max calibration.

dokumen.tips_neptune-service-manual.pdf

dokumen.tips_neptune-service-manual.pdf

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