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2. No Raster
Trouble in
power supply
circuit
Trouble in power
supply circuit
Trouble in G1
line of Main PWB
Trouble in FBT
High Voltage
trouble in FBT
Trouble in 80/
120V DC line of
power supply unit
Refer to trouble
in P,S,U
Refer to trouble in
power supply unit.
Is CRT
heater red-hot?
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Is Heater
Voltage (CRT PWB)
about 6V?
Turn the Brightness
& Contrast control
to set Maximum
No Raster
Is whole
screen bright?
Check
G1 voltage about
-40V?
Is 80V DC
line normal?
Does
turning the Brightness
control counterclockwise
make screen
bright?
Is CRT
G2 (screen) voltage
about 500V?
Trouble in
CRT
Trouble in FBT