Ring Indicator - Samsung SGH-A288 Service Manual

5-9 Ring Indicator

Ring Indicator LED does not
CN503 pin 3 = "L"?
5-15
work
Q101 pin 2 = "H"?
Yes
Q101 pin 3 = "L"?
Yes
Yes
Key PCB is OK?
Yes
END
No
GPO2 by Test S/W
No
Replace Q101
No
Resolder CN503, LED
No
Replace the Key PCB
Flow chart of trouble shooting and Circuit Diagram