
36
August 01, 2001
6881039B15
Troubleshooting
Product Family C25 and C43
PRELIMINARY
Troubleshooting Chart
Table 3. PF C25 and C43 Telephones: Level 1 and 2 Troubleshooting Chart
SYMPTOM
PROBABLE CAUSE
VERIFICATION AND REMEDY
1. Telephone will not turn on or stay on.
a) Battery either discharged or
defective.
Measure battery voltage across a 50 ohm (>1
Watt) load. If the battery voltage is <3.25 Vdc,
recharge the battery using the appropriate
battery charger. If the battery will not recharge,
replace the battery. If battery is not at fault,
proceed to b.
b) Battery terminals open or
misaligned.
Visually inspect the battery terminals on both
the battery and the telephone. Realign and, if
necessary, either replace the battery or refer to
a Level 3 Service Center for the battery
connector replacement. If battery terminals are
not at fault, proceed to c.
c) Transceiver board assembly
defective.
Remove the transceiver board assembly.
Substitute a known good assembly and
temporarily reassemble the unit. Depress the
PWR button; if unit turns on and stays on,
disconnect the dc power source and reassemble
the telephone with the new transceiver board
assembly. Verify that the fault has been cleared.
2. Telephone exhibits poor reception or
erratic operation such as calls frequently
dropping or weak or distorted audio.
a) Antenna assembly defective.
Check to make sure that the antenna terminal
makes proper contact with the transceiver board
assembly. If connected properly, substitute a
known good antenna. If the fault is still present,
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.
3. Display is erratic, or provides partial or
no display.
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.
4. Incoming call alert transducer audio
distorted or volume is too low.
a) Defective alert transducer.
Replace alert transducer according to the
procedures. If fault still present, proceed to b.
b) 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 misaligned or
defective.
Ensure microphone is correctly positioned in
socket. If fault still present, 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) 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 b.
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