Motorola T193 Service Manual page 36

Troubleshooting
Table 3. PF B95 and C21 Telephone: Level III Troubleshooting Chart (Continued)
SYMPTOM
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. 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. a) Headset plug not pushed fully
32
PROBABLE CAUSE
Faulty transceiver board assembly.
a) Microphone defective.
b) Transceiver board assembly
defective.
a) Connections to or from transceiver
board assembly defective.
b) Earpiece speaker defective.
c) Transceiver board assembly
defective.
a) SIM card defective.
b) Transceiver board assembly
defective.
a) Vibrator defective.
b) Transceiver board assembly
defective.
Faulty charger circuit on transceiver
board assembly.
home.
b) Faulty jack on transceiver board
assembly.
July 27, 2001
Product Family C21
VERIFICATION AND REMEDY
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.
Replace the microphone as described in the
procedures. If fault is not cleared, proceed to b.
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.
Check connection from the earpiece to the
transceiver board assembly. If connection is not
at fault, proceed to b.
Temporarily replace the LCD speaker assembly
with a known good assembly. Ensure good
connection. Place a call and verify improvement
in earpiece audio. If fault is cleared, reassemble
the phone with the good assembly. If fault is not
cleared, proceed to c.
Replace the transceiver board assembly (refer
to 1c). Verify that the fault has been cleared and
reassemble with the new transceiver board
assembly.
Check the SIM card contacts for dirt. Clean if
necessary, and check if fault has been cleared.
If the contacts are clean, insert a known good
SIM card into the telephone. Power up the unit
and confirm that the card has been accepted. If
the fault no longer exists, replace the defective
SIM card. If the SIM card is not at fault, proceed
to b.
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.
Replace vibrator as described in the
procedures. If the fault has not been cleared,
proceed to b.
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.
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 assembly (refer
to 1c). Verify that the fault has been cleared and
reassemble the unit with the new transceiver
board assembly.
6881038B70