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6-3
V20 Chassis Technical Training
and Troubleshooting Guide
The Doubler circuit sync pulse outputs are directed to
the VCJ, IC2V00. Both Horizontal and Vertical Drive
Generators are in the VCJ. Horizontal drive is output at
pin 40, and vertical drive is output at pins 52 and 53.
The signals are directed to their respective output cir-
cuitry on the PCB-MAIN.
The Sub Picture Sync Signal Path is also shown in
Figure 1.
It is basically the same as the Main Sync
Signal Path, and is comprised of IC2LA0, IC2LA1,
IC2S00, IC2P00 and part of IC2P01. The sub sync
signals are used only in the Doubler circuitry for POP/
PIP signal processing.
Horizontal Deflection
Figure 2
illustrates the Horizontal Deflection Drive
and Output circuitry. Horizontal drive signal from
the VCJ is amplified by Horizontal Drive circuitry
comprised of transistors Q2V40, Q5A40, Q5A33,
Q5A39 and Q5A32.
The output from Q5A32 is directed to Q5A31, the
Horizontal Output transistor. The output from Q5A31
takes three paths:
1) To the horizontal windings in the Deflection
Yokes
2) Through C5A34 and Q5A37 to the HV
Drive circuitry.
3) Through T5A31, providing the source for
the CRT filament supply.
H-Deflection DC Supply Circuitry
The DC supplies for Q5A32 and Q5A31 are derived
from H-Deflection DC Supply circuitry. The 31K
line from the Control µPC control the DC voltage
for Q5A31 controlled by . Q5A31 supply voltage is
approximately 3 volts higher for the 33.75 kHz scan
format (1080i), than that for the 31.5 kHz scan
(480p),
The H-Deflection DC Supply circuitry is also used
to:
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