Motorola V70, Service Manual, Page: 41 / 59

6881039B25 January 08, 2002 37
Level III Service Manual Troubleshooting
Troubleshooting Chart
Table 4.V70 Telephone: 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 terminals open or
misaligned. 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 battery connector
replacement. If battery terminals 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.
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 assembly. If the connection is
OK, 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) Mating connections to or from
transceiver board faulty. Check general condition of flex and flex
connector. If the flex and connector is good,
check that the display assembly mounting tabs
are fully engaged. If connector is not at fault,
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.
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.
5. Telephone transmit audio is weak.
(usually indicated by called parties
complaining of difficulty in hearing voice). a) Microphone defective. Replace the microphone as described in the
procedures. If fault is not cleared, 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.
6. Receive audio from earpiece speaker is
weak or distorted. a) Connections to or from transceiver
board assembly defective. Check connection from the earpiece to the
transceiver board assembly. If connection is not
at fault, proceed to b.