Yaskawa i80M Maintenance Manual - Manual (Page 131)

4.3.11 9“ CRT SCREEN IS DARK
Cause of Trouble
Power voltage is too
low.
Escutcheon is dirty.
Brightness is not
properly adjusted.
Hardware failure
Table 4.40 9“ C R T S c r e e n i s D a r k
Check Method
it with CN13 on the model
board or CN28 on the model JANCD
board at rear side of 9“ CRT unit.
2
5 3
CN 13 (Model JANCD-FC900B board)
Solution
●
If the voltage drops at
power cable, replace the
cable.
●
If model or
output voltage
is also low, it may be
caused by failure of
model or
16F.
Contact your
Y A S K A W A
representative.
28 (Model board)
I
visually if the surface of escutcheon Clean up CRT display and
the section between escutcheon and CRT escutcheon.
1
{Trouble other than above)
[Do not perform setup
change of CRT as a rule. ]
Perform adjustment with
VR1 (BRIGHT) on model
JANCD-FC900B board.
Replace CRT unit or
model JANCD-FC900B
board. Contact your
YASKAWA
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