Motorola A920 Service Manual page 41

Level 1 and 2 Service Manual
Table 7. Level 1 and 2 Troubleshooting Chart (Continued)
Symptom
7. Telephone will not recognize or accept
SIM card.
8. Vibrator feature not functioning.
9. Internal Charger not working.
10. No or weak audio when using
headset.
6881024B40-A
Probable Cause
b) Earpiece speaker defective.
c) Transceiver board defective.
a) SIM card defective.
b) Transceiver board defective.
a) Vibrator defective.
b) Transceiver board defective.
Faulty charger circuit on transceiver
board.
a) Headset plug not pushed in fully.
b) Faulty jack on transceiver board.
October 27, 2003
Verification and Remedy
Temporarily replace speaker with a known
good speaker. Ensure good connection. Place
a call and verify improvement in earpiece
audio. If fault is cleared, reassemble phone
with good transceiver board. If fault is not
cleared, proceed to c.
Replace transceiver board (refer to 1c). Verify
that fault has been cleared and reassemble
phone with new transceiver board.
Check the SIM card contacts for dirt. Clean if
necessary, and check if fault has been
cleared. If contacts are clean, insert a known
good SIM card into phone. Power up phone
and confirm that card has been accepted. If
fault no longer exists, replace defective SIM
card. If SIM card is not at fault, proceed to b.
Replace transceiver board (refer to 1c). Verify
that fault has been cleared and reassemble
phone with new transceiver board.
Replace vibrator as described in the
procedures. If the fault has not been cleared,
proceed to b.
Replace transceiver board (refer to 1c). Verify
that fault has been cleared and reassemble
phone with new transceiver board.
Test a selection of batteries in the rear pocket
of the desktop charger. Check LED display for
the charging indications. If these are charging
properly, then the internal charger is at fault.
Replace the transceiver board assembly (refer
to 1c). Verify that the fault has been cleared
and reassemble the unit with the new
transceiver board assembly.
Ensure the headset plug is fully seated in the
jack.
Replace transceiver board (refer to 1c). Verify
that fault has been cleared and reassemble
phone with new transceiver board.
Troubleshooting
35