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2. No Raster
Trouble in
power supply
circuit
Trouble in power
supply circuit
Trouble in G1
line
Trouble in FBT or its
pin4 ambient circuit
High Voltage
trouble in FBT
Trouble in 100Vdc
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
Yes
No
No
No
No
Yes
No
Yes
Yes
Yes
Yes
No
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
-60V?
Is 100Vdc
line normal?
Does
the Brightness control
make screen
bright?
Is CRT
G2 (screen) voltage
about 730V?
Trouble in
CRT
Raster OK
Yes
Yes