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2. No Raster
Turn the Brightness
& Contrast control
G2 (screen) voltage
turning the G2 VR in HVG
No Raster
Is CRT
No
heater red-hot?
Yes
fully Maximum
Yes
Is whole
screen bright?
Yes
Check
G1 voltage about
-35V?
Yes
Is CRT
about 490V?
Yes
Is 80Vdc
line normal?
Yes
Does
counterclockwise
make screen
bright?
Yes
Trouble in HVG
Is Heater
Voltage (CRT PCB)
about 6.3V?
No
Trouble in
power supply
circuit
No
Trouble in video
circuit
No
Trouble in G1
line of Main PCB
No
Trouble in HVG
Trouble in 80Vdc
No
line of power
supply unit
No
Trouble in G2
of HVG
17
Yes
Trouble in
CRT
Refer to trouble
in P.S.U
Refer to trouble
in P.S.U
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