TROUBLESHOOTING GUIDE
E-2
Is the heater voltage at
pin 10 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 DC184V ?
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 Q401 DC114V and
Q402 DC27V ?
Check FB401 and associated circuit.
No
Yes
Is the waveform at base
of Q401 normal ?
No
Yes
Is the waveform at pin
46 of IC101 normal ?
Check the circuit from pin 46 of
IC101 to Q402.
Check IC101 and associated circuit.
Check Q402 and associated circuit.
