Motorola Timeport 280 Service Manual page 44

Troubleshooting
Table 3. PF B58 Telephone: Level 1 and 2 Troubleshooting Chart (Continued)
SYMPTOM
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. Real Time Clock resetting when
standard battery is removed.
11. No or weak audio when using headset. a) Headset not fully pushed home.
40
PROBABLE CAUSE
c) Transceiver board assembly
defective.
a) Connections to or from transceiver
board assembly defective.
b) Earpiece speaker defective.
c) Antenna assembly defective.
d) Transceiver board assembly
defective.
a) SIM card defective.
b) Transceiver board assembly
defective.
a) Transceiver board assembly
defective.
a) Faulty charger circuit on transceiver
board assembly.
a) RTC battery in the transceiver
board.
b) Faulty jack socket on transceiver
board assembly.
May 14, 2001
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.
Gain access to the transceiver board assembly
as described in the procedures. Check
connection from the earpiece to the transceiver
board assembly. If connection is not at fault,
proceed to b.
Remove the transceiver board and insert into
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 speaker. If fault is not cleared,
proceed to c.
Check to make sure the antenna is installed
correctly. If the antenna is installed correctly,
substitute a known good antenna assembly. If
this does not clear the fault, reinstall the original
antenna assembly and proceed to d.
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 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.
Replace RTC battery according to the
procedures.
Ensure the headset plug is fully seated in the
jack socket.
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.
P280
6881038B15