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SAMSUNG Proprietary-Contents may change without notice
6-4
Troubleshooting
6-1-4 Abnormal Key Data input
Check initial status
Scanning signals
output from U104, pins 5C, 48,
5D, 4A, 6C, 5A, 6D?
Check U104 pins
5C, 48, 5D, 4A, 6C, 5A, 6D
Check U104 pins 2A, 4C, and 3B
Check CON102-24.
Normal key data input?
Replace the keypad assembly
END
Yes
Yes
Yes
Yes
No
No
Summary of Contents for SCH 620
Page 75: ...9 Block Diagrams SAMSUNG Proprietary Contents may change without notice 9 1 9 1 Main Diagram ...
Page 77: ...SAMSUNG Proprietary Contents may change without notice 9 3 MEMO MEMO ...
Page 79: ...PCB diagrams Samsung Electronics 10 2 10 2 Main PCB Bottom Diagram ...
Page 80: ...PCB diagrams Samsung Electronics 10 3 10 3 CLC PCB Top Diagram 10 4 CLC PCB Bottom Diagram ...
Page 81: ...PCB diagrams Samsung Electronics 10 4 10 5 Hands free Kit PCB Top Diagram ...
Page 84: ...Samsung Electronics 11 3 Circuit diagrams 11 3 CLC Circuit Diagram ...
Page 85: ... Samsung Electronics Co Ltd APRIL 2000 Printed in Korea Code No GH68 00669A BASIC ELECTRONICS ...