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Model
KV-AR21M83
Pages
97
Size
5.65 MB
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PDF
Document
Service Manual
Brand
Device
TV
File
kv-ar21m83.pdf
Date

Sony KV-AR21M83 Service Manual ▷ View online

– 8 –
KV-AR21M83
   RM-W101
• The following adjustments should be made when a
complete realignment is required or a new picture
tube is installed.
Set the controls as follows unless otherwise noted:
VIDEO model .....................................................  Standard
PICTURE control ..................................................  normal
BRIGHTNESS control ..........................................  normal
Perform the adjustments in the following order :
1. Beam Landing
2. Convergence
3. Focus
4. Screen(G2)
5. White Balance
Note : Test Equipment Required.
1. Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
5. Oscilloscope
SECTION 2
SET-UP ADJUSTMENTS
Fig. 2-1
Fig. 2-4
Fig. 2-3
Fig. 2-2
Purity control
Red
Blue
Green
Purity control
corrects this area.
Disk magnets or rotatable
disk magnets correct these
areas (a-d).
Deflection yoke positioning
corrects these areas.
a
b
b
c
c
d
d
a
Preparation :
• In order to reduce the influence of geomagnetism on
the set's picture tube, face it east or west.
• Switch on the set's power and degauss with the
degausser.
2-1. BEAM LANDING
Picture Mode: DYNAMIC
1. Input a white signal with the pattern generator.
Contrast
Brightness
2. Set the pattern generator raster signal to a green
raster.
3. Move the deflection yoke to the rear and adjust with
purity control so that the green is at the center and
the blue and the red take up equally sized areas on
each side. (See Figures 2-1 through 2-4.)
4. Move the deflection yoke forward and adjust so that
the entire screen is green. (See Figure 2-1.)
5. Switch the raster signal to blue then to red and verify
the condition.
6. When the position of the deflection yoke has been
decided fasten the deflection yoke with the screws
and DY spacers.
7. If the beam does not land correctly in all the corners,
use a magnet to adjust it. (See Figure 2-4.)
}
......................................................................................................................................................................................................................
normal
– 9 –
KV-AR21M83
   RM-W101
R G
B
R
G
B
R
G B
R
B
R
G
G
G
B
R
B
2-2. CONVERGENCE
• Before starting this adjustment, adjust the focus,
horizontal size and vertical size.
• Receive dot/hatch signal.
• Pic mode: Soft.
(1) Horizontal and Vertical Static Convergence
1. (Moving vertically), adjust the V.STAT magnet so that
the red, green and blue dots are on top of each other
at the center of the screen.
2. (Moving horizontally), adjust the H.STAT control so
that the red, green and blue dots are on top of each
other at the center of the screen.
3. If the H.STAT variable resistor cannot bring the red,
green and blue dots together at the center of the
screen, adjust the horizontal convergence with the
H.STAT variable resistor and the V.STAT magnet in
the manner given below.
(In this case, the H.STAT variable resistor and the
V.STAT magnet influence each other, so be sure to
perform adjustments while tracking.)
Center dot
R    G    B
R
G
B
H. STAT VR
V. STAT
Magnet
RV750
H. STAT
CV Board
BMC (Hexapole)
V.STAT
DY pocket
Purity
V.STAT
BMC
Purity
Operation of V.STAT magnet
If the V.Stat magnet is moved in the “A” and “B” arrows,
the red, green and blue dots moves as shown below.
Moved RV750 H.STAT.
the red, green and blue dots move as shown below.
4. BMC (Hexapole) Magnet.
If the red, green and blue dots are not balanced or
aligned, then use the BMC magnet to adjust in the
manner described below.
R
R
G
G
B
B
A
B
B
A
R
R
G
G
B
B
A
B
– 10 –
KV-AR21M83
   RM-W101
(2) Convergence Rough Adjustment
Preparation:
• Before starting this adjustment, adjust the horizontal
static convergence and the vertical static
convergence
TLV
R B
YCH
R
B
XCV
B
R
TLH
B
R
Piece A (90), conv. correct
a
b
c
d
TLH
Insert
TLH
Correction Plate to DY Pocket
(Left or Right)
YCH
Insert
YCH
VOL on DY
TLV
Rotate TLV
VOL on DY
XCV
Rotate XCV
Adj core on DY
(3) Screen corner Convergence
1. Affix a Piece A (90), conv. correct corresponding to
the misconverged areas.
b
a
c
d
a-d : screen-corner
        misconvergence
ON DY:
TLV
TLV
XCV
YCH
DY pocket
DY pocket
TLH Plate
XCV
– 11 –
KV-AR21M83
   RM-W101
2-5. WHITE BALANCE ADJUSTMENT
1. Set to Service Mode (Refer Section 3-1:
ADJUSTMENTS WITH COMMANDER)
2. Input white raster signal.
3. Set Picture to <DYNAMIC mode>
4. Select RDRV (02) with 
1
 and 
4
 and fixed the value
to 25 with 
3
 and 
6
.
5. Adjust WHBL GDRV (03) and BDRV (04) with 
1
 and
4
 and adjust the data with 
3
 and 
6
 for best white
balance in Highlight condition.
6. Write into the memory by pressing [MUTING] then 
-
.
7. Adjust WHBL BKOR (00) and BKOG (01) with 
1
 and
4
 and adjust the level with 
3
 and 
6
 for best white
balance cut-off condition.
8. Write into memory by pressing [MUTING] then 
-
.
9. US model need to apply only for colour temperature
in Neutral.
2-6. SUB BRIGHT ADJUSTMENT
1. Set to service mode.
2. Brightness set to 50%, Picture....Minimum
3. Select WHBL SBRT (10) with 
1
 and 
4
 and adjust
SBRT (10) data with 
3
 and 
6
 so that the third stripe
from right dimly lit.
4. Write into the memory by pressing [MUTING] then 
-
.
5. GA models C/O: 20 IRE
S/G: 30 IRE
165 
± 2VDC
2-3. FOCUS ADJUSTMENT
FOCUS adjustment should be completed before the W/B
adjustment:
1. Receive digital monoscope pattern.
2. Set picture mode: DYNAMIC.
3. Adjust focus VR to obtain a just focus at the center of
the screen.
4. Change receiving signal to white pattern and blue
back.
5. Confirm MAGENTA RING is not noticeable. Incase
magenta ring is obvious, then adjust FOCUS VR to
balance magenta ring and FOCUS.
2-4. G2 (SCREEN) Adjustment
1. Set the PICTURE & BRIGHTNESS to STANDARD.
2. Put the Video input mode signal.
3. Connect R,G,B of the CV board cathode to
oscilloscope.
4. Adjust Brightness to obtain the cathode value to
value below.
5. Adjust G2 (screen) on the FBT until picture shows
the point before cut off.
FLYBACK TRANSFORMER  (T802-14")
FLYBACK TRANSFORMER  (T801-21")
SCREEN
FOCUS
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