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2. No Raster
No Raster
Is
Heater Voltage
(CRT PWB)
about
6V?
Is
CRT heater
red-hot?
No
Trouble in
CRT
Refer to trouble in
power supply unit.
Turn the Brightness
& Contrast control
fully Maxium
Trouble in
power supply
circuit
Trouble in
video
circuit
whole screen
bright?
Check
G1 voltage about
-55V?
Trouble in G1
line of Main
PWB
Is CRT
G2 (screen) voltage
about 500V?
No
Trouble in FBT
Is
80Vdc line
normal?
Refer to trouble
in P.S.U
Trouble in 80Vdc
line of power
supply unit
Does
turning the Brightness
contro! counterclockwise
make screen
bright?
No High Voltage
trouble in FBT
Raster OK
10
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