Sony TRINITRON KV-M2140B - Section 4 Circuit Adjustments; 4-1. A Board Adjustments

| KV-M2140B
RM-694
SECTION 4
CIRCUIT ADJUSTMENTS
4-1. A BORAD ADJUSTMENTS EVE REQ /Ajustinent( i 502)
. 1. Input a PAL COLOR BAR signal, then connect an
RV 001 electrolytic capacitor (100 4/16 V) between pin@®)
[CHR.POS|
[cams and GND of IC 502.
i 2. Adjust RV 502 (H.FREQ) to stop scrolling of the
ie picture in the horizontal direction.
301
BELL 3. After adjustment, remove the electrolytic capacitor.
RV 331 a _
a
fic 301 | 301 RV 504
te Dic = be [H-CENT|
®
een os mses =
4
—~, |
REF OSC 8.8 MHz Adjustment (CT 332
oe aN 1. Input a PAL COLOR BAR pattern.
aOnnD 2. Short circuit between pin@? of IC 331 and ground.
-Component side- 3. Adjust CT 332 to obtain color synchronizetion.
FU AGC Adjustment (RV 503) 4. Remove the jumper wire from IC 331.
1. Tune in air signal.
2. Adjust AGC VR (RV 503) so that snow-noise and
cross-modulation just disappear from the picture.
BELL FILTER Adjustment (LV 301
1. Input aSECAM COLOR BAR pattern.
2. Connect an oscilloscope to rhe Q 302 emitter.
3. Adhust LV 301 so that waveform becomes flat.
RV 504 H.CENT (HORIZONTAL CENTER)
a 7
Before Adjustment After Adjustment
RV 801 H.SIZE (HORIZONTAL SIZE) ISECAM DISCRI Adjustment (RV 331 R-Y L 331 B-Y)
1. Input aSECAM COLOR BAR pattern.
2. Connect an oscilloscope to pin @ of IC 301.
3. Adjust RV 331(R-Y) so that white and black parts
fth fe f pi b lecel.
RV 501 V.CENT cael CENTER) of the wavelorm of pin) Decomigs ace
4. Connect an oscilloscope to pin @ of IC 301.
5. Adjust L 331(B-Y) so that white and black parts of
the waveform of pin @ becomes 0 level.
RV
505
V.SIZE
(VERTICAL
SIZE)
sea
0
level
he
(white
part)
(black
part)
(white
and
black
jevels
should
become
0
level)
RV
802
PIN
AMP
(PINCUSHION
AMPLIFIER)
pp
Hy
=e
(Before
Adjustment)
(After
Adjustment)