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5-8
SGH-Q100 Flow Chart of Troubleshooting and Circuit Diagram
5-8. Ring Indicator
Ring Indicator does not work
Y
Y
N
Y
Check the Q601 pin 2 is
“High”
Check U601
N
Y
Check the Q601 pin 3 is
“Low”
Replace Q601
N
Y
Check the voltage of
LED601 Anode is
around 3.7.
Resolder or change LED601
END
Check the connection between
CN201 and LCD-Keypad PCB