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4. TROUBLE SHOOTING
4.12 Key Sense Troubleshooting
Key Sense sequence of U830 is :
Default condition ROW(1-4) is 2.6V → Press the key → Corresponding row(x) go to 0V → Key
sensing
Start
Check the side key
FPCB and Connector
Work well?
Check the Key PCB
ROW(0-4) is 2.6V?
Change the Main board
side key FPCB and Connector
Yes
NO
NO
Change the EL Sheet or
Change the Main PCB
YES
NO
Check RA400
YES
- 110 -
End
ROW 1
RA400
ROW 2
ROW 3
ROW 4
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Table of Contents
Troubleshooting
