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Level 3 Repair
8-3-4. Sim1 Part
Phone can't access SIM Card
Yes
No
Resolder C506, C509
SIM500 pin1 (C506) ≒ 3.0V
insert SIM card & access it,
or C509 > 2.99V ?
then must be sim pin1 or C506 > 3.0V
Yes
After Power ON,
Check SIM_CLK Signal on
No
Resolder or Replace SIM500 connector.
pin3(C508) of SIM500 in a few
seconds.
(Because of not soldering well)
(method : wiring pin 3 and
checking its waveform using an
oscilloscope)
Yes
Check the SIM Card
(look over if it get damaged.)
Yes
END
8-12
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