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TROUBLESHOOTING HINTS
1. No Character
No Character
Are the
Contrast &
Brightness Controls
maximum ?
Change the Contrast &
Brightness control value
to maximum
whole screen
bright?
Refer to
No Raster
Yes
Check the peripheral
circuit of CRT
Rk, Gk, Bk
i
mw
About 45Vpp
Is CRT
Cathode (Rk, Gk, Bk)
signal level
normal?
Is the
output signal of the
(pin 18, 20, 23) pre-amp
(1C801, LM1281)
Check the Video output
circuit and IC802
(pin 3, 4, 10) and
their ambient circuit
Trouble in 12Vdc line
of the Main PWB
No
Check the clamping
pulse circuit
tae
clamping pulse
(pin 15 of 1C801)
ormal?
AN 12Vpp
Check the
input signal
d
signal cable
normal?
Trouble in {C801 and
its ambient circuit
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