Sony TRINITRON KV-M2140B - Page 27

SECTION 4
|
KV-M2140K/M2141K
RM-694
CIRCUIT
ADJUSTMENTS
4-1.
A
BORAD
ADJUSTMENTS
RV 001
CHR.POS
Co)
CT 332
cee
CT 331
a re
ont :
ican
fics | 331
RV331 (L331
ky © BY
fic 301 | fic 301 | RV 504
oy
(I)
rc
on
[a
[H-CENT]
RV 801 RV 503
fs]
face)
©
Pv
ses
Visi)
RV501 ©
@RV 802
PIN AMP
ot. 502
© nFeQ]
A BOARD
-Component side-
TU AGC Adjustment (RV 503
1. Tune in air signal.
2.
Adjust
AGC
VR
(RV
503)
so
that
snow-noise
and
cross-modulation
just
disappear
from
the
picture.
RV
504
H.CENT
(HORIZONTAL
CENTER)
CHI
RV
801
H.SIZE
(HORIZONTAL
SIZE)
CHO
RV
501
V.CENT
(VERTICAL
CENTER)
AHO
RV
505
V.SIZE
(VERTICAL
SIZE)
LAOH
RV
802
PIN
AMP
(PINCUSHION
AMPLIFIER)
al
H.FREQ
Adjustment
(RV
502)|
1.
Input
a
PAL
COLOR
BAR
signal,
then
connect
an
electrolytic
capacitor
(100
u/16
V)
between
pin®
and
GND
of
IC
502.
2.
Adjust
RV
502
(H.FREQ)
to
stop
scrolling
of
the
picture
in
the
horizontal
direction.
3.
After
adjustment,
remove
the
electrolytic
capacitor.
f0: suitable
f0: 15.625+50Hz
f0: too low
f0:
too high
REF
OSC
7.16
MHz
Adjustment
(CT
331
1.
Input
an
NTSC
COLOR
BAR
pattern.
2.
Short
circuit
between
pin
@®
of
IC
331
and
ground.
3.
Adjust
CT
331
to
obtain
color
synchronizetion.
4.
Remove
the
jumper
wire
from
IC
331.
REF
OSC
8.8
MHz
Adjustment
(CT
332
1.
Input
a
PAL
COLOR
BAR
pattern.
2.
Short
circuit
between
pind)
of
IC
331
and
ground.
3.
Adjust
CT
332
to
obtain
color
synchronizetion.
4.
Remove
the
jumper
wire
from
IC
331,
BELL
FILTER
Adjustment
(LV
301)
1.
Input
a
SECAM COLOR
BAR
pattern.
2.
Connect
an
oscilloscope
to
rhe
Q
302
emitter.
3.
Adhust
LV
301
so
that
waveform
becomes
flat.
=
Before
Adjustment
After
Adjustment