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5-7
Flow Chart of Troubleshooting and Circuit Diagram
5-7 SGH-A300 Key Data Input
Check initial operation
Y
Y
N
Y
Check the
pin 1, 3, 4, of CN602 is
“High”
Check the M46(U201)
N
Y
When one of the keys is
pushed, one of pin [5:12] of
CN602 is “High”
Replace the key PCB
END
Check the connection between
CN602 and Keypad.