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V8088
4. Incoming calls alert transducer
audio distorted or volume is too
low.
5. Personal telephone transmit
audio is weak, (usually indicated by
called parties complaining of
difficulty in hearing voice from
personal phone).
6. Personal telephone receive audio
is weak and/or distorted. (From
speaker)
7. Personal telephone will not
recognize/accept SIM card
SYMPTOM
8. Phone does not sense when flip is
Opened or closed (usually indicated
by inability to answer incoming
calls by opening the flip, or
inability to make outgoing calls).
Defective.
a) Faulty alert Transducer / Main
RF / Logic PCB defective
a) Microphone connections to
The main RF / Logic board are
defective.
b) Microphone defective
c) Logic/RF Board Assembly
defective.
a) Connections to/from
Logic/RF
Circuit board defective.
b) Earpiece Speaker defective.
c) Antenna assembly is
defective.
d) Logic/RF Board Assembly
Defective.
a) SIM card defective
PROBABLE CAUSE
b) Logic/RF Board Assembly
Defective.
a) Magnet in flip defective
b) Reed Switch defective
Verify that the fault has been cleared and
Re-assemble the unit with the new PCB.
Replace Logic/RF Board Assembly (refer to
symptom 1c). Verify that the fault has been cleared
and re-assemble the unit with the new PCB.
Gain access to the Microphone as described in the
DISASSEMBLY instructions in this manual. . Check
connections. If connector is faulty proceed to c if the
connector is OK, proceed to b.
Gain access to microphone .Disconnect
and substitute a known good Microphone. Place a
call and verify improvement in portable transmit
signal as heard by called party. If good, re-assemble
portable with new Microphone. If Microphone is not
at fault, re-install original Microphone and proceed
to c.
Replace Logic/RF Board Assembly (refer to
symptom 1c). Verify that the fault has been cleared
and re-assemble the unit with the new PCB.
Gain access to Logic/RF board as described in the
DISASSEMBLY instructions in this manual. Check
connection and the flexistrip from the earpiece to the
Logic/RF circuit board. If flex is at fault then replace
front / flip Assy. If Zif connector is at fault proceed
to d. If connection is not at fault, Proceed to b.
Remove RF / Logic PCB from housing and insert
into known good housing with flip, ensure good flex
connection. Place a call and verify improvement in
earpiece audio. If better, reassemble the phone with
the good Hsng. If it was no better then re-install into
the original housings and proceed to c.
Attempt a re-phasing of the unit and recheck the
symptom. If symptom is the same but unit re-phases
correctly, check to make sure the two antenna
Connector is correctly soldered to the main board
and that the antenna is fitted correctly. If ok,
substitute a known good antenna assembly. If this
does not cure the fault, re-install the original
assembly then proceed to d.
d) Replace Logic/RF Assembly (refer to symptom
1c). Verify that the fault has been cleared and
Re-assemble the unit with the new PCB.
Initially check that the contacts on the card are not
dirty. Clean if necessary, and check if fault has been
eliminated. If the contacts are clean, insert a
Known good SIM card into the portable telephone.
Power up the unit and confirm whether or not the
card has been accepted. If the fault no longer
Exists, the defective SIM card should be replaced. If
the SIM card is not at fault, proceed to b.
VERIFICATION AND REMEDY
Replace Logic/RF Board Assembly (refer to
symptom 1c). Verify that the fault has been cleared
and re-assemble the unit with the new PCB.
Replace Front / flip assembly with known good one
refer to the DISASSEMBLY instructions in this
manual. Place call to portable phone and verify
ability to answer by opening flip. If faulty rebuild
phone with new front / flip Assy. If fault is still
present, replace original flip assembly and proceed to
b.
Gain access to Keypad board as described in the
DISASSEMBLY instructions in this manual.
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