Troubleshooting Chart - Motorola C331 Service Manual

Level 2 Service Manual
Table 2. Manual Test Mode Commands (Continued)
Key Sequence
5*0*14 Set audio level 14
5*0*15 Set audio level 15
6*2*2*0*0 Set Audio Path. Int Mic, IntSpk, RX unmute, TX unmute
6*4*6*0*0 Set Audio Path. Boom Mic, Boom Spk, RX unmute, TX unmute
18*0 Initialize non-volatile memory (Master Reset)
18*1 Initialize Non-volatile memory (Master Clear)
55*2*001 Test Display. All pixels ON
55*2*000 Test Display. All pixels OFF
55*2*002 Test Display. Checkerboard pattern A
55*2*003 Test Display. Checkerboard pattern B
55*2*004 Test Display. Border pixels ON
*#9999# Display Phone Information
Phone Set up --> Flex Version / Technology / S-W Version / Readiness Status
Phone Status -->
Other
Information

Troubleshooting Chart

Table 3. C331 Telephone: 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.
6881040B85
Test Function/Name
Probable Cause
a) Battery either discharged or
defective.
b) Battery terminals open or
misaligned.
c) Transceiver board defective.
a) Antenna defective.
b) Transceiver board defective.
July 19, 2002
Troubleshooting
Remarks
No test mode required
No test mode required
Verification and Remedy
Measure battery voltage across a 50 ohm
(>1 Watt) load. If battery voltage is <3.25 Vdc,
recharge the battery using the appropriate
battery charger. If battery will not recharge,
replace the battery. If battery is not at fault,
proceed to b.
Visually inspect 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 battery connector
replacement. If battery terminals are not at fault,
proceed to c.
Remove the transceiver board assembly.
Substitute a known good transceiver board and
temporarily reassemble the unit. Press the PWR
button; if unit turns on and stays on, disconnect
the dc power source and reassemble the phone
with the new transceiver board. Verify that the
fault has been cleared.
Check connection between the antenna and the
transceiver board. If the connection is OK,
substitute a known good antenna. If the fault is
still present, proceed to b.
Replace the transceiver board (refer to 1c).
Verify that the fault has been cleared and
reassemble the unit with the new transceiver
board.
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