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NO RASTER
Does the RASTER
appear at maximum
BRIGHT/CONTRAST ?
No
Is the high voltage of
ANODE 27KV~28KV ?
No
Is collector voltages
of Q401 DC114V and
Q402 DC27V ?
No
Is the waveform at base
of Q401 normal ?
No
Is the waveform at pin
46 of IC101 normal ?
No
Check IC101 and associated circuit.
TROUBLESHOOTING GUIDE
Yes
Is the voltage of pin 4 of
CP803 DC184V ?
Check the 180V line.
Yes
Is the heater voltage at
pin 10 of J801 AC6.4V ?
Check the HEATER circuit.
Yes
Yes
Yes
E-2
Yes
No
Yes
No
Check the output circuit and
associated circuit.
Contact defects of CRT or CRT
Socket.
Check FB401 and associated circuit.
Check Q402 and associated circuit.
Check the circuit from pin 46 of
IC101 to Q402.
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