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CR1 chassis (E)
6
3.
D BOARD
3-1. DEFLECTION CIRCUIT PART
3-1-1. Horizontal deflection circuit system block diagram (extracted)
A block diagram of horizontal deflection circuit system is shown in <Fig. 1>.
BA9759F
+B CHOP
HSAW SW
HSHAPE
HSHAPE
S6
PWM OUT
PWM NFB
HD-IN
+15V
IC501
+B
N board
DA board
FET x 7
S501
C537
Q505
C508
D504
HCC : L509
H-DY
HOC : L510
HST : T504
HDT : L501
H DRIVE
HLC : L502
LCT : T503
H LIN BAL
CONTROL
+15V
FBP
<Fig. 1>
3-1-2. Horizontal deflection circuit
Horizontal deflection is made based on horizontal drive pulses outputted from the D/A board.The size control is made by IC501 based
on the H SHAPE signal outputted from the D/A board.
This chassis uses a tap switching system by "HCC" to control the raster horizontal position. This system can change raster position only
for three positions of S501.
For the linearity control of horizontal deflection, a variable type of HLC inductance is adopted using the "LCT:T503". The inductance
of "HLC:L502" as viewed from horizontal deflection system is parallel value with the "LCT:T503". Accordingly, the inductance of
"HLC:L502" can be changed equivalently by changing L value of "LCT:T503". Also, the linearity control by the S-shaped capacitor is
performed, and 127 different values can be set with arbitrary frequencies.
3-1-3. Vertical deflection circuit system block diagram (extracted)
A block diagram of vertical deflection circuit system is shown in <Fig. 2>.
STV9379A
VSAWN
DCC2
DCC2
V-DIF+
V-DIF–
V-DIF–
+15V
IC401
–15V
DA board
V-DY
<Fig. 2>
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