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Troubleshooting
Table 4. Product Family 0C45 Telephone: Level 1 and 2 Troubleshooting Chart (Continued)
SYMPTOM
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).
6. Receive audio from earpiece speaker is
weak or distorted.
7. Telephone will not recognize or accept
SIM card.
38
PROBABLE CAUSE
b) Touch screen display assembly
defective.
c) Main board assembly defective.
Faulty alert transducer or main board
assembly.
a) Microphone connections to the
main board assembly defective.
b) Microphone defective.
c) Main board assembly defective.
a) Connections to or from main board
assembly defective.
b) Earpiece speaker defective.
c) Antenna assembly defective.
d) Main board assembly defective.
a) SIM card defective.
March 21, 2003
Product Family 0C81
VERIFICATION AND REMEDY
Remove the touch screen display assembly as
described in the procedures. Temporarily
reassemble unit with a known good touch
screen display assembly and verify proper
operation. If fault is cleared, reassemble unit
with the new assembly. If fault not cleared,
proceed to c.
Replace the main board assembly (refer to 1c).
Verify that the fault has been cleared and
reassemble the unit with the new main board
assembly.
Replace the main board assembly (refer to 1c).
Verify that the fault has been cleared and
reassemble the unit with the new main board
assembly.
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.
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.
Replace the main board assembly (refer to 1c).
Verify that the fault has been cleared and
reassemble the unit with the new main board
assembly.
Gain access to the main board assembly as
described in the procedures. Check the speaker
leads and connector from the flip assembly to
the main board assembly. If speaker leads are at
fault, replace the flip assembly. If connector is at
fault, proceed to d. If connection is not at fault,
proceed to b.
Replace the flip assembly as described in the
procedures. Temporarily reassemble unit and
verify proper operation. If fault has not been
cleared, replace original flip assembly and
proceed to proceed to c.
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 d.
Replace the main board assembly (refer to 1c).
Verify that the fault has been cleared and
reassemble with the new main board assembly.
Check the SIM card contacts for dirt. Clean if
necessary and check if fault has been cleared. If
the contacts are clean, insert a known good SIM
card into the telephone. Power up the unit and
confirm that the card has been accepted. If the
fault no longer exists, replace the defective SIM
card. If the SIM card is not at fault, proceed to b.
6809462A54
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Troubleshooting
