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5-8
SGH-Q200 Flow Chart of Troubleshooting and Circuit Diagrams
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 Q601~3 pin 3
is “Low”
Replace Q601/Q602/Q603
N
Y
Check the voltage of
Ring indicator Anode is
around 3.7 V
Resolder or change LED
END
Check the connection between
CN203 and Keypad PCB