Motorola T200 Service Manual page 34

T200 / T2688
Repair Chart
Table 2. GSM T200 Cellular Telephone: Troubleshooting and Repair Chart. (Assembly Replacement
Level).
SYMPTOM
Personal telephone will not turn on or
stay on
2. Personal telephone exhibits poor
reception and/or erratic operation
(such as calls frequently dropping,
Weak and/or distorted audio, etc.).
3. Display is erratic, or provides
Partial or no display.
4. Incoming call alert transducer audio
distorted or volume is too low.
5. Personal telephone transmit audio is
weak, (usually indicated by called parties
complaining of difficulty in hearing
voice from personal phone).
6. Personal telephone receive audio is
weak and/or distorted. (From speaker)
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PROBABLE CAUSE
a) Battery pack either
discharged or defective
b) Battery connectors open
or misaligned.
c) Logic/RF Board
Assembly
Defective.
a) Antenna is defective
b) Logic/RF Board
Assembly
Defective.
a) Logic/RF Board
Assembly
Defective.
a) Logic/RF Board
Assembly
Defective.
a) Logic/RF Board
Assembly
Defective.
a) Connections to/from
speaker and Logic/RF
Circuit board defective.
b) Earpiece Speaker
defective.
c) Antenna assembly is
defective.
d) Logic/RF Board
Assembly
Defective.
GSM Field Service Support
VERIFICATION AND
REMEDY
Measure battery. If the battery voltage is <3.6V dc,
recharge the battery using the appropriate battery
charger. If the battery will not recharge, replace the
battery.
If battery is not at fault, proceed to b.
Visually inspect the 4 battery connectors on both the
battery assembly and the portable telephone.
If necessary, replace the battery. If battery is not at
fault, proceed to c
Remove the Logic/RF Assembly. Substitute a known
good assembly and temporarily reassemble the unit.
Depress the PWR button; if unit turns on and stays
on, disconnect the dc power source replace the faulty
unit.(see personality transfer).
Check to make sure that the antenna pin is properly
connected into the Logic/ RF assembly. If OK,
substitute a known good antenna and test in a call. If
the fault is still present, proceed to b.
Replace Logic/RF Assembly (refer to symptom 1c).
Verify that fault has been cleared and replace faulty
unit.
Replace Logic/RF Assembly (refer to symptom 1c).
Verify that fault has been cleared and replace faulty
unit.
Replace Logic/RF Assembly (refer to symptom 1c).
Verify that fault has been cleared and replace faulty
unit.
Replace Logic/RF Assembly (refer to symptom 1c).
Verify that fault has been cleared and replace faulty
unit.
Gain access to Logic/RF board as described in the
DISASSEMBLY instructions in this manual. Check
contact springs on the Logic/RF circuit board. Clean
pads if necessary. If spring is at fault proceed to d. If
connection is not at fault, Proceed to b.
Remove speaker from front housing and insert
known good speaker. Place a call and verify
improvement in earpiece audio. If better, reassemble
the phone with the good speaker. If it was no better
then proceed to c.
Check to make sure that the antenna pin is properly
connected into the Logic/ RF assembly. If OK,
substitute a known good antenna and test in a call. If
the fault is still present, proceed to d.
Replace Logic/RF Assembly (refer to symptom 1c).
Verify that fault has been cleared and replace faulty
unit.