-900 X X X Series
-1200 X X X Series
Composite type model (M-C9004N M-C12004N, M-C9001N, M-C12001N, M-C12009N)
1 No Character No contrast
1
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Check signal level at
connector pin #8
Normal
Check CRT display
Check base voltage and
signal level of 010
Normal
Check collector voltage
of 010, 011 and bothend's
voltage of D13
Normal
'
Check emitter voltage of
012
Normal
Check DC voltage and
signal level of CRT cothode
Normal
Check DC voltage of CRT G1
Confirm the voltage when turn
the sub-bright VR (normal 3V
~
-30V)
Normal
Check CRT and hi-voltage circuit
Refer to No raster
Zero or
low
Abnormal
Abnormal
Abnormal
Abnormal
Abnormal
-29-
Trouble in logic
1
Trouble in VR 11
1
Trouble in 010, 011, D13 1
Check of Trouble
012
Readjust of VR12
Trouble in 014 or
video +B line
Trouble in brightness
.s::ircuit or +40V line
Replace 012