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5. Horizontal Output Circuit
MODE
B+ Voltage
VGA
73.2V dc
54KHz
117.4V dc
68KHz
148.9V dc
14.5Vp-p
11V p-p
4V p-p
Trouble in Horizontal
output circuit
(No Raster)
Is
B+ line voltage
normal?
Yes
Is
Q505 base
waveform
normal?
No
Is
Q504 Gate
waveform
normal?
No
Is
IC501 pin8
H.DRV waveform
normal?
No
Is
IC501 pin10
voltage about
12V?
Yes
Is
the input H.sync
correct?
No
Trouble in H.sync line
19
No
Trouble in power
supply circuit
Yes
Trouble in FBT
Yes
Trouble in Q501, T501
If the holddown circuit stops the
horizontal oscillator during the check,
turn off the power then turn on again
about 10 seconds later
Yes
Q501 and its
ambient circuit
No
Check the circuit of
P. S. U
Yes
Trouble in IC501
Refer to trouble
in power supply
unit
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