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MODE B+ Voltage
VGA 60Vdc
Super VGA
72Vdc
54KHz 110Vdc
24
9
. Abnormal Picture
9-1. Horizontal Size
Trouble in L503,
C520 or their ambient
circuit
Trouble in Horizontal
output circuit
Check the B+ and
anode voltage of CRT.
Trouble in H.OSC/
Deflection Circuit
Refer to Horizontal Output circuit
Is
the DC level
of the base of Q517
changeable?
No
Yes
Is
the DC level
of IC501 pin 11
changeable ?
Yes
Check IC501
pin 11
Is the
collector pulse
of Q505 correct?
Is the
cathode waveform
of D509
correct?
Abnormal
H.Size
=1100Vp-p
80-310Vpp
* Normally anode voltage
of CRT is approximately,
24.7KV
* Scan B+ are as follow :
No
Yes
Yes
No
*
At first, adjust controls in the OSD Menu