8 Troubleshooting
SAM4S NR-500 SERIES
8-5
End
Key Board Problem
Key Input
Failure ?
Y
N
1. Check & Change Key Board Assy
2. Check the KBD Connector on PBA
3. Check the Key Scan Part 74LVC138(U26,U27)
4. Check the Key Return part 74LVC541(U28)
5. Check the related Circuit and Pattern
Specific Key
Failure?
1. Check the affected Key
2. Check the Matrix Bus & Data Bus
3. Check the Diodes(BAT43WS)
4. Check the Key Board Assy
N
Y
8-5 Key Board Problem
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Summary of Contents for NR-500 Series
Page 74: ...8 Troubleshooting 8 8 SAM4S NR 500 SERIES MEMO All manuals and user guides at all guides com...
Page 80: ...10 Wiring Diagram 10 4 SAM4S NR 500 SERIES MEMO All manuals and user guides at all guides com...
Page 101: ...All manuals and user guides at all guides com a l l g u i d e s c o m...
