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Level 3 Repair
8-14
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8-3-4. Sim Part
SIM300 pin 1(C305)
≒
2.85V
or C304 > 2.84V ?
Phone can't access SIM Card
Resolder C304, C305, R319
insert SIM card & access it,
then must be sim pin1 or C304 > 2.84V
Check the SIM Card
(look over if it get damaged.)
END
No
Yes
Yes
Yes
No
Resolder or Replace SIM300 connector.
(Because of not soldering well)
After Power ON,
Check SIM_CLK Signal on
pin3(C307) of SIM300 in a few
second
s.
(method : wiring pin 3 and
checking its waveform using an
oscilloscope)
Yes
No
Confirm an another PBA
After SIM card insert,
SIM300 pin 2(C306, SIM_RST)
≒
2.85V?
(method : wiring pin 3 and check
its waveform using an
oscilloscope)
Yes
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