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H.OSC Interna! type model (M-12021PB, M-12021NB, M-12041NB)
1-- � -
----�
No character (Vid
1
:::::]
raster OK
'-------
1
Check signal level at connector
Pin #8
Normal
Check CRT Display
Check Base voltage level of 014
Yes
Check DC voltage level of
CRT Cathode.
Abnormal
Trouble in Video
Amp.
Zerö or
low
No
Normal
Zero
Trouble in Video
+B
line
-32-
M-900 >< X x Series
M-1200 X X XSeries
Trouble in logic or contrast
control.
Check Contrast V R (V R 11)
Check DC voltage level of CRT Gl
Confirm the voltage when turn the
~
sub-bright VR (normal 3V
No
VR
Check Brightness circuit
+40V
or
line
-30V)
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