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
(SIM301)
connector's to SIM
card
②
resolder or change
SIM301
NO
③
YES
Check the circuit around SIM300
input circuitry
NO
Check the related circuit of
SIM301
④
YES
NO
Check the related circuit of
U300
Check the circuit around
U300 output
and voltage supply circuitry
YES
END
Содержание SGH-U300
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