Motorola L2, Service Manual

Page: 39 / 54

6809495A75-O October 14, 2005 39
Level 1 and 2 Service Manual Troubleshooting
Troubleshooting Chart
Table 4. 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 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.
b) Battery terminals open or
misaligned. 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.
c) Transceiver board defective. Remove the transceiver board assembly.
Substitute a known good transceiver board and
temporarily reassemble the phone. Press the
Power/End key; if phone 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.
2. Telephone exhibits poor reception or
erratic operation such as calls frequently
dropping or weak or distorted audio. a) Antenna defective. 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.
b) Transceiver board defective. Replace the transceiver board (refer to 1c).
Verify that the fault has been cleared and
reassemble the phone with the new transceiver
board.
3. Display is erratic. a) Display module defective Temporarily replace the display module with a
known good display module. Verify that the fault
is cleared and reassemble the phone with the
new display module. If the fault is still present,
proceed to b.
b) Transceiver board defective. Replace the transceiver board (refer to 1c).
Verify that the fault has been cleared and
reassemble the phone with the new transceiver
board.
4. Incoming call alert transducer audio is
distorted. a) Alert transducer defective Temporarily replace the alert transducer with a
known good alert transducer. Verify that the fault
is cleared and reassemble the phone with the
new alert transducer. If the fault is still present,
proceed to b.
b) Faulty transceiver board. Replace the transceiver board (refer to 1c).
Verify that the fault has been cleared and
reassemble the phone with the new alert
transducer.
5. Telephone transmit audio is weak.
(usually indicated by called parties
complaining of difficulty in hearing voice). a) Microphone obstructed by user
while holding the phone. Verify transmit audio quality. If transmit audio
quality is still weak and microphone is not
obstructed, proceed to b.
b) Microphone defective. Replace the microphone as described in the
procedures. If fault is not cleared, proceed to c.
c) Transceiver board defective. Replace the transceiver board (refer to 1c).
Verify that the fault has been cleared and
reassemble the phone with the new transceiver
board.