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TROUBLESHOOTING HINTS
1. No Character
Brightness Controls
Cathode (Rk, Gk, Bk)
output signal of the
(pin 21, 24, 26) pre-amp
(IC801, KA2500)
pulse (pin 18 of IC801)
Trouble in IC801 and
its ambient circuit
All manuals and user guides at all-guides.com
No Character
Are the
No
Contrast &
maximum
Yes
Is whole
No
screen bright?
Yes
Is CRT
Yes
signal level
Rk, Gk, Bk
normal?
About 45Vpp
No
Is the
Yes
normal?
No
No
Is 12Vdc line
normal?
Yes
Is clamping
No
normal?
Yes
No
Is input signal
normal?
Yes
15
Change the Contrast &
Brightness control to
maximum
Refer to
No Raster
No Raster
Check the peripheral circuit
of CRT Board
Check the video output
circuit and IC802 (pin 1, 3, 5)
and their ambient circuit
Trouble in 12Vdc line
of the Main PWB
Check the clamping pulse
circuit
Check the signal cable
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