Troubleshooting Chart - Motorola A1200 Service Manual

Troubleshooting

Troubleshooting Chart

Table 3. Level 1 and 2 Troubleshooting Chart
Symptom
1. Telephone will not turn on or stay on.
2. Telephone exhibits poor reception or
erratic operation such as calls frequently
dropping or weak or distorted audio.
3. No display.
4. Incoming call alert transducer audio
distorted or volume is too low.
5. Telephone transmit audio is weak.
(usually indicated by called parties
complaining of difficulty in hearing voice).
6. Receive audio from earpiece speaker is
weak or distorted.
45
Probable Cause
a) Battery either discharged or
defective.
b) Transceiver board defective.
a) Speaker/antenna assembly
defective
b) Transceiver board defective.
a) Connections between transceiver
and display faulty.
b) Display module defective.
a) Faulty antenna/speaker assembly. Replace the antenna/speaker assembly with a
b) Transceiver board defective
a) Microphone obstructed by user
while holding the phone.
b) Microphone defective.
c) Transceiver board defective.
a) Connector between transceiver
board and flip assembly faulty.
b) Transceiver board defective.
December 21, 2005
Verification And Remedy
Measure the voltage at TP_BATT+ with battery
attached. If voltage is below 3.0V, attach a
charger to the phone and ensure that the phone
is charging. If the phone does not charge,
change the battery and repeat the measurement
charging procedure. If the phone still does not
turn on, proceed to b).
Replace the faulty board with a known good
transceiver board. If the phone powers up after
replacement, reassemble the phone with a new
transceiver board. Verify that the fault is fixed.
Check connection between the speaker/antenna
assembly and the transceiver board. If the
contact is intermittent visually, replace with a
known good speaker/antenna assembly. If the
fault is still present, proceed to b.
Replace with a known good transceiver board
(refer to 1c). Verify that the fault has been
cleared with the new transceiver board and
reassemble the unit.
Check connections between transceiver board
and display. If display still does not come up,
proceed to b.
Replace with a known good display module.
Verify that the fault has been cleared with the
new display module and reassemble the unit.
known good antenna/speaker assembly. If the
problem goes away, replace with a new antenna/
speaker assembly. Else proceed to b.
Replace with a known good transceiver board
(refer to 1c). Verify that the fault has been
cleared with a new transceiver board.
Verify transmit audio quality. If transmit audio
quality is still weak and microphone is not
obstructed, proceed to b.
Replace the microphone as described in the
procedures. If fault is not cleared, proceed to c.
Replace the transceiver board (refer to 1c).
Verify that the fault has been cleared and
reassemble the phone with the new transceiver
board.
Check connections between transceiver board
and flip assembly. If the fault still exists, replace
the flip assembly with a known good one. if the
fault goes away, reassemble with a new flip
assembly. If the fault is still present, proceed to
b.
Replace the transceiver board (refer to 1c).
Verify that the fault has been cleared and
reassemble the unit with the new transceiver
board.
A1200
6809499A19-O