Troubleshooting; Troubleshooting Chart - Motorola U9 Service Manual

Troubleshooting

Troubleshooting

Troubleshooting Chart

Table 3. : 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).
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PROBABLE CAUSE
a) Battery either discharged or
defective.
b) Battery connectors open or
misaligned.
c) Transceiver board assembly
defective.
a) Antenna assembly defective.
b) Transceiver board assembly
defective.
a) Transceiver board connections
faulty.
b) Flip assembly defective.
c) Transceiver board assembly
defective.
a) Faulty Loudspeaker
b) Faulty transceiver board assembly. Replace the transceiver board assembly (refer
a) microphone obstructed by user
while holding the phone
b) Microphone defective.
c) Microphone Hole obstructed
April 01, 2008
VERIFICATION AND REMEDY
Measure battery voltage across a 50 ohm (>1
Watt) load. If the battery voltage is <3.4 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 connectors 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 connectors
are not at fault, proceed to c.
Forward to an authorized level 3 service center.
Check to make sure that the antenna pin is
properly connected to the transceiver board
assembly. If connected properly, substitute a
known good antenna. If the fault is still present,
proceed to b.
Forward to an authorized level 3 service center.
Remove rear chassis assembly from unit, check
general condition of flexible printed cable (flex).
If the flex is good, check that the flex connector
is fully pressed down. If not, check connector to
transceiver board connections. If faulty
connector, replace the transceiver board
assembly. If connector is not at fault, proceed to
b.
Temporarily replace the flip assembly with a
known good assembly. If fault has been cleared,
reassemble with the new flip assembly. If fault
not cleared, proceed to c.
Forward to an authorized level 3 service center.
Replace back housing assembly. Verify that the
fault has been cleared and reassemble the unit.
If fault not cleared, proceed to b.
to 1c). Verify that the fault has been cleared and
reassemble the unit with the new transceiver
board assembly.
Verify transmit audio quality. If transmit audio
quality is still weak and microphone is not
obstructed, proceed to b.
Replace by reworking the microphone.
If fault is not cleared, proceed to d.
Remove the Transceiver board, remove the
obstruction from the keypad and/or the PCB
Microphone holes.
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