Sony TRINITRON KV-M1400K Service Manual page 16

4-1. ABOARD ADJUSTMENTS
RVO001
co)
CT332
[REF OSC]
| 1C331 |
eee EI L331
cH)
RV801 seecs © mee
[H-SIZE [AGC]
V505 | V-SIZE
A 5 0 6 [V.SIZE]
RV501
A-BOARD
— Component side —
TU AGC Adjustment (RV503)
2.
3.
1. Tunein an off air signal.
2. Adjust AGC VR (RV503) so that snow-noise and cross-modulation
just disappear from the picture.
RV504 H.CENT (HORIZONTAL CENTER)
(CC j-L-L)
RV801 H.SIZE (HORIZONTAL SIZE)
pees) Calla
RV501 V.CENT (VERTICAL CENTER)
LJI-LI-1
RV505 V.SIZE (VERTICAL SIZE)
L HOA
[BELL
aT © [BY] avsos
[F-CENT]
( (28) @® RV502
[F-FEQ)
SECTION 4
CIRCUIT ADJUSTMENTS
[M1400D/M1401D/M1400B ]
—_
N
ow Mot
f0: too low
H.FREQ Adjustment (RV502)
Input a PAL COLOR BAR signal, then connect an electrolytic
capacitor (1001/16 V) between pin (8) and GND of IC502.
Adjust RV502 (H.FREQ) to stop scrolling of the picture in the
horizontal direction.
After adjustment, remove the electrolytic capacitor.
fO: suitable
f0: 15.625+50Hz
REF OSC 8.8 MHz Adjustment (CT332)
f0: too high
Input a PAL COLOR BAR pattern.
Short circuit between pin 7) yof IC331 and ground.
Adjust CT332 to obtain color synchronization.
Remove the jumper wire from IC331.
BELL FILTER Adjustment (LV301) |
Input a SECAM COLOR BAR pattern.
Connect an oscilloscope to the Q302 emitter.
Adjust LV301 so that waveform becomes flat.
==
Before Adjustment After Adjustment
SECAM DISCRI Adjustment (RV331 R-Y L331 B-Y)
ba del al
wie
47
Input a SECAM COLOR BAR pattern.
Connect an oscilloscope to pin Ga) of IC301.
Adjust RV331 (R-Y) so that white and black parts of the waveform
of pin (1) becomes 0 level.
Connect an oscilloscope to pin (3) of IC301.
Adjust L331 (B-Y) so that white and black parts of the waveform
of pin (3) becomes 0 level.
(white part) (black part) (white and black levels
Lip. should become 0 level)
{Before Adjustment)
(After Adjustment)
CIRCUIT ADJUSTMENTS
[ M1400K/M1401K ]
4-2. ABOARD ADJUSTMENTS
RV001
@
CT332
[REF O56]
Q302 =}... LV301
RV331 8} 1331
[RY] ® [B-Y | Rvs04
soi] [CENT]
® 1 mt
2
RV801 RV503 ;© 5 C50
[H-SIZE | [H-SIZE | [AGC | [le @ RV502
RV505 ( V-SIZE H-FEQ
@ ©
RV501
A-BOARD
— Component side —
TU AGC Adjustment (RV503)
1. Tune in an off air signal.
2. Adjust AGC VR (RV503)so thatsnow-noise nae modulation
just disappear from the picture.
RV504 H.CENT (HORIZONTAL CENTER)
(C |-LJ-
RV801 H.SIZE (HORIZONTAL SIZE)
P-E-10)
RV501 V.CENT (VERTICAL CENTER)
LIAL 1
RV505 V.SIZE (VERTICAL SIZE)
REF OSC 7.16 MHz Adjustment (CT 331)
Input an NTSC COLOR BAR pattern.
Short circuit between pin :28: of IC 331 and ground.
Adjust CT 331 to obtain color synchronization.
Remove the jumper wire from IC 331.
eS
H.FREQ Adjustment (RV502)
1. Input 2 PAL COLOR BAR signal, then connect an electrolytic
capacitor (100/16 V) between pin (8) and GND of IC502.
2. Adjust RV502 (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
REF OSC 8.8 MHz Adjustment (CT332)
f0: too Icw
f0: too high
Input a PAL COLOR BAR pattern.
Short circuit between pin (a7) of 1C331 and ground.
Adjust CT332 to obtain color synchronization.
Remove the jumper wire from IC331.
PON ae
BELL FILTER Adjustment (LV301)
1. Inputa SECAM COLOR BAR pattern.
5 Connect an oscilloscope to the Q302 emitter.
Adjust LV301 so that waveform becomes flat.
HA =
Before Adjustment After Adjustment
SE(CAM DISCRI Adjustment (RV331 R-Y L331 B-Y)
1. Inputa SECAM COLOR BAR pattern.
2. Connect an oscilloscope to pin @) of IC301.
3. AdjustRV331 (R-Y)so that white and black parts of the waveform
of pin (1) becomes 0 level.
4. Connect an oscilloscope to pin (3) of IC301.
5. Adjust L331 (B-Y) so that white and black parts of the waveform
of pin (3 ) becomes 0 level.
0 level
(white and black levels
white part) (black part
( pans pan) should become 0 level)
(Before Adjustment) (After Adjustment)
— 18 —
4-3. A BOARD
TU AGC Adjc
|. Tune in an off air :
2. Adjust AGC VR(R
just disappear fron
RV504 H.CENT (HOR
ig
RV8OI H.SIZE (HORI
EI
RV501 V.CENT (VER
LJ
RVS505 V.SIZE (VERT
| HI