TROUBLESHOOTING GUIDE
Is the heater voltage at
pin 4 of J801 AC6.4V ?
Is the high voltage of
ANODE 27KV~28KV ?
No
NO RASTER
Does the RASTER
appear at maximum
BRIGHT/CONTRAST ?
Yes
No
Is the voltage of pin 4 of
CP803 DC180V ?
Yes
No
Check the output circuit and
associated circuit.
Check the 180V line.
Yes
Yes
No
Contact defects of CRT or CRT
Socket.
Check the HEATER circuit.
Yes
No
Is collector voltages
of Q402 DC130V and
Q401 DC127V ?
Check FB401 and associated circuit.
No
Yes
Is the waveform at base
of Q402 normal ?
No
Yes
Is the waveform at pin
44 of IC102 normal ?
Check the circuit from pin 44 of
IC102 to Q401.
Check IC102 and associated circuit.
E-2
Broken wire at pin 6 of T401.
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