Motorola V2288 Service Manual page 36

V2282
SYMPTOM
4. Incoming call 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
9. Internal Charger not working
10. No / Weak audio when using
29 of 50
PROBABLE CAUSE
a) Faulty alert Transducer
b)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.
Dirty Contacts / Misalignment
of contacts or faulty speaker.
c) Antenna assembly is
defective.
d) Logic/RF Board Assembly
Defective.
a) SIM card defective
c) Logic/RF Board Assembly
Defective.
PROBABLE CAUSE
a) Batteries faulty
a) Faulty charger circuit on main
board defective
a) Headset not fully pushed
GSM Global Service Support
VERIFICATION AND REMEDY
Replace Alert Transducer from rear housing refer to
disassembly procedure.If not Alert then proceed to b)
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 as heard by called party. If good, re-
assemble unit 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.
Ensure pads on PCB are clean and that speaker
contacs are sat almost vertical to each other. If Ok
replace with known good speaker and check for call
quality. If still poor 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 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 antenna 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 unit. 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.
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.
VERIFICATION AND REMEDY
Replace suspect batteries with known good items.
Insert charger and ensure battrey charging icon
flashes if OK, replace batteries if batteries still do not
charge proceed to b)
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.
Fully ensure the 'click' is felt on the jack socket. If