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Flow Chart of Troubleshooting
10-
6
10-1-3. Sim Part
Phone can't access
SIM card
①
Check the pin 1 of
SIM301
Voltage = 3V
NO
Check the circuit related to
UCP301
YES
Check the SIM
connector's
(SIM301)
connector's to SIM
card
②
resolder or change
SIM301
NO
③
YES
Check the circuit around SIM30 1
input circuitry
NO
Check the related circuit of
SIM301
④
YES
NO
Check the related circuit of
UCP301
Check the circuit around
UCP301 output
and voltage supply circuitry
YES
END