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6
Troubleshooting
6-1 No Raster
Short Circuit
Check DC B+ line,
Q402, Q404
0 V
N o
at load?
Yes
Check I801,
Q803, R814,
R813, ZD807,
ZD801, R811,
R861, D825
No Raster
M easure
voltage of B+ at
T402 pin 2 on
PW B -M A IN
Normal
(137 V, 91kHz)
Check voltage of
cathode, heater, Grid
1, Grid 2, etc.
Check
A C I/P on
N o
C808
Yes
D801,T801,
R804, T804,
(175 V or more)
Check
F801
H igh
Check I401
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