Troubleshooting Chart - Motorola C25 Series Service Manual

Level 1 and 2 Service Manual

Troubleshooting Chart

Table 5. PF C25 Telephones: Level 1 and 2 Troubleshooting Chart
SYMPTOM
1. Telephone will not turn on or stay on.
2. Telephone exhibits poor reception or
erratic operation such as calls frequently
dropping or weak or distorted audio.
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.
6881041B25
PROBABLE CAUSE
a) Battery either discharged or
defective.
b) Battery terminals open or
misaligned.
c) Transceiver board assembly
defective.
a) Antenna assembly defective.
b) Transceiver board assembly
defective.
Transceiver board assembly defective. Replace the transceiver board assembly
a) Defective alert transducer.
b) Faulty transceiver board assembly. Replace the transceiver board assembly
a) Microphone misaligned or
defective.
b) Transceiver board assembly
defective.
a) Earpiece speaker defective.
October 14, 2002
VERIFICATION AND REMEDY
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.
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.
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.
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.
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.
(refer to 1c). Verify that the fault has been
cleared and reassemble the unit with the new
transceiver board assembly.
Replace alert transducer according to the
procedures. If fault still present, proceed to b.
(refer to 1c). Verify that the fault has been
cleared and reassemble the unit with the new
transceiver board assembly.
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.
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.
Temporarily replace the earpiece 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.
Troubleshooting
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