Service manual

16
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