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ELECTRICAL TROUBLESHOOTING GUIDE
2. SYSTEM PART
Power on.
"HELLO"
Display on FLD
OK?
YES
When turn
the volume, count is
change?
YES
FRONT board OK.
CN101
NO
cable connection
OK?
CN101
pin11, 22, 25,power
OK?
CN101
pin5, 6, 7 data signal
OK?
F+/- & VH voltage OK?
Check
NO
CN101 pin3, 4 I2C data
OK?
Check MAIN board.
3-28
NO
YES
NO
YES
NO
YES
NO
NO
YES
Check FFC cable.
Check SMPS board.
Check MAIN board.
Replace VFD301.
Check FFC cable.
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