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2. No Raster
No Raster
Is CRT
heater red-hot?
Yes
Turn the Brightness
& Contrast control
to set Maximum
Yes
Is whole
screen bright?
Yes
Check
G1 voltage about
-40V?
Yes
Is CRT
G2 (screen) voltage
about 500V?
Yes
Is 100Vdc
line normal?
Yes
Does
the Brightness
control make screen
bright?
Yes
Trouble in FBT
Is Heater
No
Voltage (CRT PWB)
about 6V?
No
Trouble in
power supply
circuit
No
Trouble in power
supply circuit
No
Trouble in G1
line
No
Trouble in FBT or its
pin 4 ambient circuit
Trouble in 100Vdc
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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