M-900 X X X Series
M-1200X X XSei-ies
-----TROUBLE SHOOTING HINTS-----
Separate type model (M-9004NA, M-9001NA, M-9009NA, M-9009A, M-K12001NB, M-12004NB,
M-K12004NB)
Check signal level at connector
Pin #8
Normal
Check CRT Display
Check CRT Heater red?
Yes
Check DC voltage level of
CRT Cathode.
Abnormal
Trouble in Video
Amp.
Zero
Trouble in Video
+B line
Zero or
low
No
Normal
-25-
Trouble in logic or contrast
control.
+B (12V) line or CRT Heater open
Check DC voltage level of CRT G1
Confirm the voltage when turn the
sub-bright VR (normal 3V
~
-30V)
No
Check Brightness circuit VR
or +40V line