The document summarizes the evolution of cellphones from 1983 to 2009, describing some of the earliest and most influential cellphone models. It also provides instructions on how to check common cellphone components like resistors, capacitors, diodes, transistors, coils, fuses, and integrated circuits using a multimeter. The steps include setting the multimeter to the appropriate range and measuring resistance readings between component terminals to identify opens, shorts, and proper functionality.

1.  Cellphone software and audio/video application

2. The evolution of cellphone
between 1983 & 2009
Motorola DynaTAC 8000X
Analog Motorola DynaTAC 8000X Advanced
Mobile Phone System mobile phone as of
1983.
1989
Motorola MicroTAC 9800X
The first truly portable phone. Up until its
release, most cellular phones were installed
as car phones due to the inability to fit them
into a jacket pocket.

3. 1992
Motorola International 3200
The first digital hand-size mobile telephone.
Nokia 1011
This was the first mass-produced GSM
phone. It was produced until 1994.

4. Nokia 1011
This was the first mass-produced GSM phone. It was
produced until 1994.
1993
BellSouth/IBM Simon Personal
Communicator
The IBM Simon was the first PDA/Phone
combo.

5. 1996
Motorola StarTAC
The first clamshell cellular phone. Also one of the first
display screens featured on a cell.
Nokia 8110
Alternately called the “banana phone”, this
phone was popularized in the first Matrix
movie.

6. Nokia 9000 Communicator
The first smartphone series, driven by an Intel 386
CPU.
1998
Nokia 9110i
This iteration of Nokia’s Communicator
series significantly reduced the weight of
this precursor to the smartphone.

7. Nokia 5110
This cell phone was the most popular consumer model
at the time of its release and for some time afterwards.
Nokia 8210
This phone was loved for its customizable design,
but hated for its screen fade.

8. Who is the first inventor of the
cellphones ?
 Martin "Marty" Cooper
(born December 26, 1928) is an American
engineer. He is a pioneer and visionary in
the wireless communications industry.
 He is considered the "father of the cell phone and
is also cited as the first person in history to make a
handheld cellular phone call in public.

10. Parts of the cellphones and its proper
checking
A resistor is good if its resistance is close
to the indicated value. Tolerance should
be considered with the ohmmeter
reading. While, no resistance reading at
all on the ohmmeter scale settings
means that the resistor is open. A zero
resistance reading on all ohmmeter scale
settings means that the resistor is
shorted.

11. How to Check Capacitors?
In most cases, a capacitor fails due to the
deterioration of the dielectric material
between its plate. Defective capacitors can
have an internal shorted terminals, excessive
leakage and degradation of capacitance
meter. For an electrolytic capacitor
(capacitors with polarity), short the terminal
capacitor to discharge it prior to testing.
To test a capacitor, set the multi-meter to
Rx10 or Rx1K scale. Connect the tester
negative probe to the capacitor positive
terminal and the positive probe to the
negative terminal.

12.  For ceramic, Mylar and other capacitor
with a capacitance with less than 1.0 uF,
the meter will not deflect at all. A
defective indication for an electrolytic
capacitor shows that the meter will rest
on zero and remain stationary at a point
which is an indication that the capacitor
is shorted.

13. How to Check Diodes?
Set the multi-meter knob to any of the
resistance position
(x1, x10, x1K or 10K ohm ).Connect the
positive probe to the anode and the negative
probe to the cathode. Then connect the
positive probe to the cathode and the
negative probe to the anode of the diode. A
good indication in the first procedure will
show the meter deflected very little or may
not deflect at all..

14. The second procedure, the meter will
deflect towards Zero. The actual
resistance reading is the forward
resistance of the diode.
A defective indication shows that the
meter won't deflect at all even when the
probes are reversed. Or the meter
deflects at the same time or almost the
same resistance reading for both steps.

15.  How to Check Transistors:
Bipolar transistors are usually checked out of a circuit by means of an
ohmmeter. When it is desired to check for the resistance across the
transistor emitter and collector, NPN or PNP, ohmmeter probes may be
connected either way. A good transistor will show above a reading above
1000 ohm.
How to determine if it is NPN or PNP transistor?
To determine the correct terminal of the transistors, set the range selector
to x 1 or 10 ohms. Connect the positive probe to the emitter and the
negative probe to the base of the transistor. Note the reading interchange
the connection of the probes to the leads of the transistor.

16. POSITIVE PROBE TO: -----NEGATIVE PROBE TO: -----RESISTANCE READING--
CONCLUSION:
Emitter------- -- Base---------- Less than 150 ohm ------Transistor is NPN
Base --------------Emitter --------Infinity ----------------Transistor is NPN

17. POSITIVE PROBE TO: NEGATIVE PROBE TO: RESISTANCE READING:
CONCLUSION:
-Emitter------------Base ---------Infinity ---------------- Transistor is PNP
Base --------------- Emitter --- - Less than 150 ohm ------- Transistor is PNP

18. NOTE : Some defective indications of transistors:
Resistance between any pair of the terminals is less than 10
ohms, means that the transistor is shorted. Resistance
between base and emitter or base collector for both the
forward and reverse application of ohmmeter probes is
infinity (meter needle don't deflect), means that the
transistor is open. Transistors overheats (except power
transistors) during normal operating condition means
that the transistor is shorted.

19.  How to Check a Coil?
Set the multi-meter to X1 a good and
working coil have a reading approximately
point to zero ohms, without any reading
means the coil is open or busted.

20.  How to Check a Fuse?
A blown SMD Fuse is not visible to our
naked eye, just set the multi-meter to x1
and put both test probe to both end side
of the fuse. A full reading here to zero
or continuity check is full. without any
reading means the fuse is already busted.

21. How to Check IC chips (Integrated Circuits)?
IC Chips is hard to determine faulty by using only a multi-
meter, some advance equipment like the one that the
manufacturer used during their productions. However; you
can determine a faulty chips by some few experiences when it
comes to troubleshooting, One techniques is that by
comparing two same components from one another. like for
example; if one chips is suspected to be faulty, then by
replacing it with a good and working same chips, you can
now determine it if the said chips got a problem. It is a trial
and error method at first; but as long as your experience and
knowledge skills increases, you can determine it more quickly
and accurately.