Mitsubishi V19-V21, Tehnical Manual

Page: 55 / 71

8-3
Deflection and HV Circuitry
Figure 8-2 illustrates the Deflection and High Volt-
age circuitry. Horizontal and Vertical Sync signals
from the VCJ are routed from the PCB-SIGNAL,
through PCB-POWER and PCB-MAIN to the De-
flection Jungle IC on PCB-JUNGLE.
Vertical sync is applied directly to pin 2 of IC4A01.
Horizontal sync triggers a MMV in IC4A03. The
clean output pulse from the MMV is applied to pin
32 of IC4A01. The horizontal and vertical Deflec-
tion Drive signals from IC4A01 are directed to the
Deflection circuitry on PCB-MAIN.
Vertical Drive is applied to IC4B01, the Vertical
Output IC, amplified and directed to the Vertical Yoke
Coils through the DY connector.
Horizontal Drive is amplified by Q5A33 and Q5A32
and applied to the base of Q5A31, the Horizontal
Output transistor. The output of Q5A31 takes three
paths.
1) To Horizontal Deflection Yoke coils.
2) Through T5A31 to generate the CRT fila-
ment supply.
3) Through C5A34 to the HV circuitry.
Q5A01 regulates the DC supply for Q5A31 and also
is the source for horizontal pincushion correction.
The HV Drive passes through Q5A37, the HV Regu-
lation IC (IC5A00), and Q5A51 to drive the Flyback
Transformer. Note that the DC Supply for IC5A00
is denoted as HV 12V. This supply is generated spe-
cifically for the HV Drive circuitry.