
42
May 15, 2001
6881038B20
Troubleshooting
Product Family B89
d) Display board defective.
Remove display board as described in the
procedures and replace with a known good
display board. Temporarily reassemble unit and
verify proper operation. If fault is cleared,
reassemble unit with the new display board. If
fault not cleared, proceed to e.
e) 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.
a) Faulty alert transducer.
Replace alert transducer. Temporarily
reassemble the unit with the known good
transducer and verify the fault has been cleared.
If the transducer is not at fault, proceed to b.
b) 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 connections to the
transceiver board assembly defective.
Gain access to the microphone as described in
the procedures. Check connections. If connector
is faulty proceed to c; if the connector is not at
fault, proceed to b.
b) Microphone defective.
Gain access to microphone. Disconnect and
substitute a known good microphone. Place a
call and verify improvement in transmit signal as
heard by called party. If good, reassemble with
new microphone. If microphone is not at fault,
reinstall original microphone and 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.
6. Receive audio from earpiece speaker is
weak or distorted.
a) Connections to or from transceiver
board assembly defective.
Gain access to the transceiver board assembly
as described in the procedures. Check flex and
the flex connector from the display board to the
transceiver board assembly. If flex is at fault,
replace front housing assembly. If flex connector
is at fault, proceed to d. If connection is not at
fault, proceed to b.
b) Connection to speaker faulty.
Remove the lens assembly as described in the
procedures. Inspect the mating contacts on the
speaker and on the display board. Repair
contacts or replace lens assembly and/or
display board as necessary. If speaker
connection not at fault, proceed to c.
c) Earpiece speaker defective.
Replace the lens assembly as described in the
procedures. Temporarily reassemble unit and
verify proper operation. If fault has not been
cleared, replace original lens assembly and
proceed to proceed to d.
d) Antenna assembly defective.
Check to make sure the antenna is installed
correctly. If the antenna is installed correctly,
substitute a known good antenna assembly. If
this does not clear the fault, reinstall the original
antenna assembly and proceed to e.
Table 3. PF A28 Telephone: Level 2 Troubleshooting Chart (Continued)
SYMPTOM
PROBABLE CAUSE
VERIFICATION AND REMEDY
Содержание B89
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