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3. A Missing Color
0.7Vpp
Cathode (Rk, Gk, Bk)
Each grid (G1, G2)
One color is
missing
Is input signal
normal?
Yes
Is the
output of pre-amp
(IC801, KA2500)
pin 21, 24, 26 all
normal?
Yes
CRT
is normal?
RK, GK, BK
About 40V p-p
Yes
voltage normal?
Yes
Replace CRT
No
Check video signal
cable or video card.
No
Trouble in IC801 or its
ambient circuit
Is video
No
output IC802 waveform
normal?
Yes
Trouble in 100Vdc line
No
Trouble in G1,G2 line
17
Trouble in
No
video output
circuit, IC802
or ambient
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