Vertical Parabola Generator - Tatung OMNISCAN SERIES Service Manual

VERTICAL PARABOLA SIGNAL GENERATOR
P70J
10 P40'l
MAIN BOARD
D702 R721
5.IV 820
r-W--.---+
1/4W
D703
9.1V
• 0704. C724
6.2.V
14l' U
25V
11726
lQI(
C721
4?U
::'5 V
Q707a
-wv--
R724
?501<.
3.50
HORIZONTAL PARABOLA SIGNAL
GENERATOR
'---1
C725
124·)
63V
(Refer to circuit diagram Fig-50)
The horizontal parabola is taking from horizontal
deflection current waveform C430 via pin 2 of P405,
the waveform being shaped, processed, amplified by
0704, 0705 and 0706 then fed to the focus electrode
via C709.
HORIZONTAL PARABOLA SIGNAL GENERATOR
TO NOS
~ ~
MAIN
BOARD
OF3
DF2
@
PTOl • I
f
Rnl
1130K
1I2W
R73"2
R730
t12~K
V.FOCUS
..,. I "K
I/,.W
CONT ROL
I ..
Q707b
qj
.-.JM---r--o SUTPtn
L.::.
1" /rio.
R7:~3 I
lP 1
" , 'l;.I
27f)K
I
c'
r.
7(:
I
2 _.
~
,1
I II2W
I ., .. -
.--..-----1
0708 1 '
R7'2?
C3G7~
Tn
IK
>R?34
.---'\\,r___-......
P?28
3.3K
i
'?;';::
6.8K
1.
The module supplies of
+
350V is provided (pin 1 of
P701) by C434 and fusible resistor R478. R483 and
R484 are discharge resistor of C434. The level of
horizontal parabola signal is controlled by C704-
R708-C710-R707 at the input to the amplifier.
The horizontal and vertical parabola signal are
summing at TP1.
Fig-50
350V
cp
OF I
C704
R714
C709
152
-0.01
2.2M
400V
1I2W
I.GKV H.FOCUS
.----+--io .. --+---Il-x-+
CONT ROL
R?O?
=
3-40
=
Cl07
~ Nb~
101 f'IIZW
0706
C3675
o
~~TPUT
R?;?
I
C708
I. 2K
1
-Z22P
1/4W