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3. A Missing Color
One color is
Is input signal
0.7Vpp
output of pre-amp
(IC801, KA2500)
pin 21, 24, 26 all
Cathode (Rk, Gk, Bk)
Each grid (G1, G2)
voltage normal?
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missing
No
normal?
Yes
Is the
No
normal?
Yes
CRT
No
is normal?
RK, GK, BK
About 40V p-p
Yes
Yes
No
17
Check video signal
cable or video card.
Trouble in IC801 or its
ambient circuit
Is video
No
output IC803 waveform
normal?
Yes
Trouble in 80Vdc line
Trouble in 80Vdc line
Trouble in
video output
circuit, IC803
or ambient
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