Motorola V80 - Troubleshooting Chart

6809471A72-O April 14, 2004 37
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 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 connectors open or
misaligned.
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.
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. If
the fault has not been cleared then proceed to d.
d) keyboard assembly failure. Replace the keyboard assembly. Temporarily
connect a +3.6 Vdc supply to the battery
connectors. Depress the PWR button. If unit turns
on and stays on, disconnect the dc power source
and reassemble with the new keyboard assembly.
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 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.
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.
a) Transceiver board connections
faulty.
Remove rear housing 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.
b) Blade assembly defective. Temporarily replace the blade assembly with a
known good assembly. If fault has been cleared,
reassemble with the new blade assembly. If fault
not cleared, proceed to c.
c) 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.
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.