32
July 27, 2001
6881038B70
Troubleshooting Product Family C21
4. Incoming call alert transducer audio
distorted or volume is too low.
Faulty 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.
5. Telephone transmit audio is weak.
(usually indicated by called parties
complaining of difficulty in hearing voice).
a) Microphone defective.
Replace the microphone as described in the
procedures. If fault is not cleared, proceed to b.
b) Transceiver board assembly
defective.
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.
6. Receive audio from earpiece speaker is
weak or distorted.
a) Connections to or from transceiver
board assembly defective.
Check connection from the earpiece to the
transceiver board assembly. If connection is not
at fault, proceed to b.
b) Earpiece speaker defective.
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.
c) Transceiver board assembly
defective.
Replace the transceiver board assembly (refer
to 1c). Verify that the fault has been cleared and
reassemble with the new transceiver board
assembly.
7. Telephone will not recognize or accept
SIM card.
a) SIM card defective.
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.
b) Transceiver board assembly
defective.
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.
8. Vibrator feature not functioning.
a) Vibrator defective.
Replace vibrator as described in the
procedures. If the fault has not been cleared,
proceed to b.
b) Transceiver board assembly
defective.
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.
9. Internal Charger not working.
Faulty charger circuit on 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.
10. No or weak audio when using headset. a) Headset plug not pushed fully
home.
Ensure the headset plug is fully seated in the
jack.
b) Faulty jack on 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.
Table 3. PF B95 and C21 Telephone: Level III Troubleshooting Chart (Continued)
SYMPTOM
PROBABLE CAUSE
VERIFICATION AND REMEDY
Summary of Contents for T193
Page 2: ......
Page 18: ...14 July 27 2001 6881038B70 General Operation Product Family C21 ...
Page 42: ...38 July 27 2001 6881038B70 Part Number Charts Product Family C21 ...
Page 45: ......
Page 47: ...T193 RF BACK END SCHEMATIC ...
Page 48: ...T193 RX FRONT END SCHEMATIC ...
Page 49: ...T193 AL SCHEMATICS ...
Page 50: ...T193 BOARD LAYOUT PAGE 1 2 ...
Page 51: ...T193 BOARD LAYOUT PAGE 2 2 ...
Page 52: ...T193 ANTENNA SWITCH SCHEMATIC ...
Page 53: ...T193 SWITCHING CONTROL SCHEMATIC ...
Page 54: ...T193 TRANSCEIVER SCHEMATIC ...
Page 55: ...T193 TRANSMIT AMPLIFIER SCHEMATIC ...
