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ELECTRICAL TROUBLESHOOTING GUIDE
4. DISPLAY ABNORMAL
Display abnormal
YES
Check IC301
YES
pin1 "VFD_CLK",
pin2 "VFD_DATA",
pin3 "VFD_STB"
signal.
NO
Check PN306
YES
pin13 "VFD_CLK",
pin14 "VFD_DATA",
pin12 "VFD_STB"
signal.
NO
Check PN306
cable connection.
YES
Check IC301
pin50 "VKK"
voltage=-28V±10%.
NO
YES
Check
PN306 pin5.
NO
Check SMPS part.
Check
R307, R308, R309.
3-9
Check VFD301
YES
pin1,2 "FF+" (+4.3V±10%)
pin41,42 "FF-"
(-4.3V ±10%)
NO
Check SMPS part.
Check FB303.
Normal.
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