The assembling process of DT T12 TWS earbuds-melinda200529

The Production Process of T12 TWS
- b y M e l i n d a
2 0 2 0 . 5 . 2 9

Shenzhen DUNTUO Electronics Co.,Ltd. www.szdotop.com Tel: +86 75585219767 Email:melinda@szdotop.com
Contents
01 SOP of T12 Earbuds
SOP of T12 Charging Box
Quality Control Process
Reliablity Testing Machines
02
04
03

Step1:Burning
software/program to PCBA
Tips:left and right earbuds
PCBA burning separately
Step2:Soldering paste
of the copper column
Tips:this is the
preparation of welding
the copper column
Step3:Welding the
copper column
Tips:the temperature
is 380°+-20°C
Step4:Adding UV glue to the
copper column/PCBA power
consumption testing
Tips:the purpose of UV glue is to
avoid short circuit between the two
welding point
100% testing,12pcs per
time,standard is within 0.009mA
and the red light in PCBA turns on
SOP of T12 Earbuds

Step5:Welding speaker cable
Tips:white cable is positive
pole,blue cable is negative
pole
Step6:Welding battery
cable
Tips:red cable is positive
pole,blue cable is
negative pole
Step7:Installing
PCBA foam
Tips:the purpose is
to shade the light on
the button
Step8:Dividing PCBA
SOP of T12 Earbuds

SOP of T12 Earbuds
Step9:installing silicone
mic&enlarge back case hole
Tips:the purpose of silicone mic is
to avoid echo when talking
the purpose of enlarge hole is to
install the case more perfectly
Step10:installing
magnet
Tips:use 203 glue
first,then put magnet,then
use PC glue to reinforce
Step11:pressing posion
column by safety
pressure fixture(夹定位柱）
Tips:the purpose is to
install the case more
perfectly without gap

SOP of T12 Earbuds
Step12:placing the PCBA
to the earbuds back case
Step13:welding battery
Tips:the soldering iron
temperature is 360°+-
20°C
Step14:welding speaker
Tips:the soldering iron
temperature is 360°+-20°C
Step15:adding glue to the
bottom cable hole
Tips: use 885 glue,the purpose is
to avoid dust and echo

SOP of T12 Earbuds
Step17:RF Testing
Tips:testing the bluetooth
transmission distance
and frequency
response(it's very
important to ensure the
transmission stability)

SOP of T12 Earbuds
Step18:adding 533ST
glue to speaker case
Step19:install the back case
and speaker case
Tips: If there is little gap,it needs
to use the safety pressure fixture
to press

SOP of T12 Earbuds
Step20:sound curving
testing
Tips:test the speaker and mic
1)speaker:test frequency range is
50-5KHz(bass:20-200Hz;alto:200-
2KHz;treble:2K-20KHz);the 2 middle
lines are testing data,the upper and
bottom lines are standards,test data
should be within these two lines.
2)sound distortion: test line should
be lower the standard(5%)
3)MIC: test line should be above the
standard line
(It's most important to ensure a
good quality sound earphone)

SOP of T12 Earbuds
Step21:adding 4606
glue to back case
Tips:add glue to seven
positions
Step22:installing the front
and back case&pressed by
the safety pressure fixture
Tips:add blush preventive
agent（防白剂）to avoid the
overflow of the glue,then
install by hand,then put it in
the machine to press about
20S
Step23:charging currency
test&factory reset
Tips: the currency standards is
30-70mA.
the purpose of rest is to erase all
the testing records

SOP of T12 Earbuds
Step24:clean and check the
appearance
Step25:pairing left and
right earbuds
Tips:power on first,then
double press the function
button,if one earbud light
turns on and another one
turns out,means pairing
successful

Step1:installing middle case
magnet 1
Tips: 3pcs in 3 position, add 203
glue first,then put the magnet,then
add PC glue to reinforce
Step2:installing middle
case magnet 2
Tips: 3pcs in 3 position,
add 203 glue first,then
put the magnet,then add
PC glue to reinforce
Step3:soldering FPC to
charging PCB board
Tips: 3pcs in 3 position,
add 203 glue first,then
put the magnet,then add
PC glue to reinforce

Step4:hot melting the charging
PCBA to the middle case
Tips: 3 melting points
Step5:welding charging
PCBA board
Step6:screwing PCBA
board
Tips: 2pcs

Step7:welding battery Step8:fixing the battery
Tips:add PC glue to
fix,then wrap masking
tape
Step9:currency and
voltage testing
Tips: charging currency
standard:250-600mA
battery voltage:3.8-4.2V
charging voltage:4.8-5.2V

Step10:installing light pipe&EVA
foam
Step11:installing
spindle to the upper
case
Tips:install 1pc by hand
Step12:installing upper case
Tips: install the upper case
groove(凹槽） and flat first,then
install the upper case with middle
case. After installation,must
check the upper light turns on
white,and the light on PCBA turns
on red

Step13:installing finished
charging box
Tips: install the upper case and
middle case first,then intall it with
the bottom case.
Step14:checking appearance
Tips:check the silk
print,color,scratch etc.

Quality Control Process
Incoming Quallity Inspection
(IQC)
Pre-production Inspection In-processing Quallity Inspection
(IPQC)
Finished Product Quallity Inspection
(FQC)
Outgoing Quallity Inspection
(QQC)
Supplier Warehouse Material Qualification
Incoming QC
In-processing
QC
Out of Box
Inspection
Out-going
Inspection
Finished Products QC
Reliablity Test
Failure Analysis Return Material Repiar

IQC
supplier warehouse(presently)
IQC inspection form
manager authorizewarehouse
production line
warehouse
production
bulk return
back
purchasing
filing
IQC
inspection
Tips
Checking main
materials type:
• PCBA
• speaker
• battery
• plastic
• hardware
• cable
• silicone
• package
Checking standard:
AQL 0.4(MA):1.0(MI)

FQC
fill in report sheet/mark
warehousing
abnormal quality sheet
improvement policy
policy confirmation
NG
OK
NG
finished
products
inspection
prepare
BOM,document,test
kits,sample etc.
check document/check
inspection sheet and
actual inspection products
FQC
inspection
fill in report sheet
return back
improvement&rework

Reliablity Test Machines
button life testing machine
alcohol&friction resistance
testing machine
USB plug testing machine
• test purpose: button life
• test time: 10000 times
• test speed: 30times/min
• test purpose:silk print adhension
• test time: 50-100 round-trip
• test speed: 20 round-trip/min
• test purpose: USB port life
• test time: 5000times
button life testing machine
alcohol&friction resistance
testing machine

button life testing machine for bluetooth speaker
• test purpose: button life
• test time: 5000-10000 times
aging testing shielded box
• test purpose: check the working
status of speaker and battery
during running
• test time: 24-48hours
• test condition: maximum
volume
salt spray testing machine
• test purpose: check the corrision resistance
of hardware component
• test time: 24-48hours
• test condition: 35°C temperature,5% brine
strength

tension testing machine
• test purpose: USB cable's
bearing tension force
• test time: 1min
• test condition: 5KG-force
• test purpose: dropping resistance
• test condition:
bare earbuds: 1.6m-1.7m height in 6 sides
bare charging box: 1m-1.1m height in 6 sides
gift box: 1m-1.1m height in 1 corner,3 edges,6 sides
carton: 1m-1.1m height in 1 corner,3 edges,6 sides
dropping testing machine temperature&hummidity chamber
• test purpose: working environment
• test condition:
high temperature:60°C,95% humidity, last 48hours
low temperature:-20°C,last 48hours
high temperature working:55°C/50°C,playing
music,last 12hours

simulation transport viration table
• test purpose: the reliablity of package during
transportation
• test condition: 0.3 amplitude(振幅),5-100Hz
frequency
static lifting machine
• test purpose: cable's bearing lifting
force
• test time: 1min
• test condition: 4-5kg for USB
cable,2kg for earphone cable,3kg
for neckband cable
signal frenquancy sweep
testing machine(信号扫频仪）
• test purpose: test speaker's signal
frequency

hardness testing machine
• test purpose: test the hardness of
silicone and plastic material
wire bending testing machine
• test purpose: USB cable's bearing
tension force
battery capacity testing machine
• test purpose:test battery's capacity
• test unit: 0.2C/0.5C
• test condition: 5 charge-discharge cycle

The assembling process of DT T12 TWS earbuds-melinda200529

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Similar to The assembling process of DT T12 TWS earbuds-melinda200529

Similar to The assembling process of DT T12 TWS earbuds-melinda200529 (20)

Recently uploaded

Recently uploaded (20)

The assembling process of DT T12 TWS earbuds-melinda200529