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Similarly, when output voltage on pin 7 of 0351a is
low, this voltage will turn on 0304 via 0305, part of dc
current will flow into vertical deflection coil via R320
and 0304, the raster position will be moving down.
VERTICAL POSITION ADJUSTMENT
Fig-10
INPUT+!?244Yl-. . . -
. . . - - - - - - - -.... - - . ,
Q315.
11324
0305
74.1K
HZII.AI
R325
11329
IO<JI(
lOOK
R322
11320
4.1K
150
2V1
R310
TO V.OUTPIIT
CIRCUIT
V.
pas
ITI
O~ +~w.--4--II---w.----""'--r--+r
CONTROL INPIIT
C311
11326
0306
(fROM MICRO BO.ARO)
104J
101<
IN5231B
3.11 VERTICAL BLANKING CIRCUIT
(Refer to circuit diagram Fig-11)
Vertical blanking pulse is produced by clipping the
vertical pulse with. a18V zener diode from pin 1 of
0301 via R351 and network R361-0320-0324, it is
also combined with horizontal blanking signal via
network 0321-0321-R354-C341-R358. (BLANKING
CIRCUIT 1.)
(The vertical blanking pulse is produced from pin 13
of 0310 via R353 in some other model). (BLANKING
CIRCUIT 2.)
3.120PC (EASE-WEST CORRECTION) CIRCUIT
(Refer to circuit diagram Fig-12)
The East-West correction can be reached by modula-
tion the horizontal yoke with a parabola, the parabola
can be obtained directly from the coupling capacitor
C309 in the vertical output stage.
Network 0320a-0320b-R343-0310 is introduced to
generate the parabola signal, vertical saw-tooth
EAST-WEST CORRECTION CIRCUIT
Q620b
L0.\358
VERTICAL BLANKING CIRCUIT 1.
Fig-11A
0301
0320
lDA-1675
IN4148
'TO
0322
~~
P437K51
.---!It--'''BLANKING
C9·15
~
OU'TPUT
G
'¥r-....--f-J
0324
<:1 PCl] 11
~
~~~O ~~~I
~G)--l
~~~
VERTICAL BLANKING CIRCUIT 2.
Fig-11B
0320
IN4148
R351
47K
--A,,"h
-"TO
0301
TOAI675
R353
6.8K
BLANK
GENERATOR
AND
CR1
PRI)"fE.CT I ON
0322
BLANKING
OUTPUT
CIRWIT
(ramp) signal is fed to pin 2 of summing amplifier
0320a via R330-C321, a DC signal is fed to pin 3 of
0320a via R337-R336 to adjust the symmetry of the
parabola ("trapezoidal" or "keystone" correction).
R343 is used to set the amplitude of parabola signal.
The parabola signal is also controlled by network
0350-0351-0352 and relatives resistors.
Fig-12
>'-~--r--~--10 R602
TO
PINI P402
C636
471
50'/
CC35
563J
SOY
R656
3~1<
RS51
lOOK
0320.
0320b
R31 0
+-i-~I--~""'~~/r-7-""--:~~:"OJ ~:I
t.",
~
3.31<
R312
'~'---'-"W'r,--,
R330 C3Z I
lOOK
IOU
SOY
R331
4701<
3-10
=
R343
51<
OPC
AOJ.
C632
0.47U
50Y NP
C323
4.7U
SOY
16Y
P310 TO
PYlB·
1732
P310
USER
OPC
CONTRO~
CIRCUI'C
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