3-1-3. Sim Part
Phone can't access
SIM card
Check the pin 1 of
SIM301
Voltage = 3V
YES
Check the SIM
connector's
(SIM301)
connector's to SIM
card
YES
Check the circuit around SIM301
input circuitry
YES
Check the circuit around
U300 output
and voltage supply circuitry
YES
END
NO
NO
NO
NO
3-7
Flow Chart of Troubleshooting
①
Check the circuit related to
U300
②
resolder or change
SIM301
③
Check the related circuit of
SIM301
④
Check the related circuit of
U300