Motorola C331 Service Manual page 38

Troubleshooting
Table 3. C331 Telephone: Level 1 and 2 Troubleshooting Chart (Continued)
Symptom
3. Display is erratic, or provides partial or
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.
7. Vibrator feature not functioning.
8. Internal Charger not working.
9. No or weak audio when using headset. a) Headset plug not pushed in fully.
34
Probable Cause
a) Mating connections to or from
transceiver board faulty.
b) Transceiver board defective.
Faulty transceiver board.
a) Microphone defective.
b) Transceiver board defective.
a) Connections to or from transceiver
board defective.
b) Earpiece speaker defective.
c) Transceiver board defective.
a) Vibrator defective.
b) Transceiver board defective.
Faulty charger circuit on transceiver
board.
b) Faulty jack on transceiver board.
July 19, 2002
Verification and Remedy
Check general condition of flex and flex
connector. If the flex and connector are good,
check that the display assembly mounting tabs
are fully engaged. If connector is not at fault,
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.
Replace the transceiver board (refer to 1c).
Verify that the fault has been cleared and
reassemble the unit with the new transceiver
board.
Replace the microphone as described in the
procedures. If fault is not cleared, 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.
Check connection from the earpiece to the
transceiver board. If connection is not at fault,
proceed to b.
Temporarily replace the speaker with a known
good speaker. Ensure good connection. Place a
call and verify improvement in earpiece audio. If
fault is cleared, reassemble the phone with the
good transceiver board. 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.
Replace vibrator as described in the
procedures. If the fault has not been cleared,
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.
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 the transceiver board (refer to 1c).
Verify that the fault has been cleared and
reassemble the unit with the new transceiver
board.
6881040B85