Flow Chart of Troubleshooting
3-7
3-1-3. Sim Part
Phone can't access
SIM card
①
Check the pin 1 of
SIM300
Voltage = 3V
NO
Check the circuit related to
UCP300
YES
Check the SIM
connector's
(SIM300)
connector's to SIM
card
②
resolder or change
SIM300
NO
③
YES
Check the circuit around SIM30 0
input circuitry
NO
Check the related circuit of
SIM300
④
YES
NO
Check the related circuit of
UCP300
Check the circuit around
UCP300 output
and voltage supply circuitry
YES
END