Samsung SCH-3500 series Service Manual page 36

8-1-4 Abnormal Key Data Input
Check initial status.
Scanning signals
outputted from P901
pins 33~42?
Normal Key data input?
END
NO
YES
NO
YES
SAMSUNG Proprietary-Contents may change without notice
Resolder P901 pins 33~42
Replace the Keypad assembly.
8-4
Trouble Shooting