Service manual

27
10. High Voltage Circuit
Trouble in Q574 or FBT
Is Q574
base waveform
normal?
Yes
Yes
Trouble in Q572, Q573
12V Line
Is Q571
collector waveform
normal?
Yes
No
Trouble in Q571
Is Q501
emitter waveform
normal?
Yes
No
Trouble in Q501, Q502
Is IC501
pin 26 waveform
normal?
Yes
No
Trouble in power supply
Is IC501
pin 29 voltage
about 12V?
No
No
Trouble in IC501
ambient circuit.
Is the
input H.Sync
correct?
Yes
Yes
No
Trouble in H.V circuit
(No Raster)
Trouble in H.Sync
Trouble in power
supply circuit
Is
B+(45V) line
voltage normal?
No