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Flow Chart of Troubleshooting
9-15
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9-1-7. SIM Part
YES
NO
NO
After Power on,
Check SIM_CLK signal at
SIM400: pin #3 in a few
seconds (C440)
SIM400: pin1 is 'High'?
(R406)
Phone can not access a
SIM card
Check the U400
Check OSC400 (32KHz)
YES
END
YES
YES
After SIM card insert,
SIM_RST signal at SIM400:
pin #2 is 'High'(C438) ?
NO
Replace PBA
Check the SIM Card
YES