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2. No Raster
No Raster
Is CRT
heater red-hot?
Yes
Increase the Brightness
& Contrast control level
fully Maximum
Is whole
screen bright?
No
Check
G1 voltage about
-70V?
Yes
Is CRT
G2 (screen) voltage
about 540V?
Yes
Is 65Vdc
line normal?
Yes
Does
increasing of the
Brightness control level
make screen
bright?
Yes
Raster OK
Is Heater
No
Voltage (CRT PWB)
about 6V?
No
Trouble in
power supply
circuit
Trouble in
Yes
power supply
circuit
No
Trouble in G1
line of Main PWB
No
Trouble in FBT
Trouble in 65Vdc
No
line of power
supply unit
No
High Voltage
trouble in FBT
16
Yes
Trouble in
CRT
Refer to trouble in
power supply unit.
Refer to trouble
in P.S.U
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