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5.7 Trouble Shooting Guide
Backlight can't be turned on
No raster?
Yes
LED Green?
Yes
Backlight can't be
turned on.
Yes
Is there 24Vdc
voltage on pin9 of
Yes
Is there high-level voltage on
pin4 of IC501?
Yes
Are connected rightly CN501,
CN502, CN503 and CN504?
Yes
Is there instantaneously pulse wave on pin1,
pin11, pin14 of IC501 at the moment of restart?
Yes
Is ok T501, T502?
Check feedback circuit LI1, LI2, OV1,
OV2
No
No
No
No
Yes
Check power
supply
Yes
Is Ok R502?
No
No
Is Ok IC501?
No
41
Check I/F board
R502 open
Connecting the
output connector
again
Yes
U501, U502 fail
IC501 fail
T501, T502 fail
END
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