Sim Part - Samsung SGH-E840 Service Manual

3-1-3. Sim Part

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