DOWNLOAD Sony KV-AW21M50 (serv.man3) Service Manual ↓ Size: 10.33 MB | Pages: 84 in PDF or view online for FREE

Model
KV-AW21M50 (serv.man3)
Pages
84
Size
10.33 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / SUPPLEMENT-1
File
kv-aw21m50-sm3.pdf
Date

Sony KV-AW21M50 (serv.man3) Service Manual ▷ View online

– 7 –
KV-AW21M50/M81/P50
RM-GA002
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
The controls and switch should be set as follows unless
otherwise noted:
Picture control ......................................................... NORMAL
Brightness control ................................................... NORMAL
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. G2 (SCREEN)
5. White Balance
Note: Test Equipment Required
1. Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
SECTION 2
SET-UP ADJUSTMENTS
Preparation :
• Feed in the white pattern signal.
• Before starting, degauss the entire screen with the
degausser.
• In order to reduce the geomagnetism on the set's
picture tube, face it east or west.
2-1. BEAM LANDING ADJUSTMENT
1. Input a raster signal with the pattern generator.
2. Loosen the deflection yoke mounting screw, and set the
purity control to the center as shown below.
3. Set the raster signal of the pattern generator to green.
4. Move the deflection yoke (DY) backward and adjust the
purity control so that green is in the center and blue and
red are at the sides evenly.
5. Then move the DY forward and adjust so that the entire
screen becomes green.
6. Now switch over raster signal to red then blue and
confirm the condition.
...................................................................................................................................................................................................................... ...........
5. Oscilloscope
6. Landing Checker
7. XCV Adjuster
Purity control
Red
Blue
Green
7. When the position of the DY is determined, tighten it
with the DY mounting screw.
8. If the beam does not land correctly in all corners of the
screen, use magnet disc to correct it.
2-2. CONVERGENCE ADJUSTMENT
Preparation :
• Before starting, perform FOCUS adjustment.
• Picture mode STANDARD.
• Receive dot/cross hatch pattern.
a) Vertical Static Convergence
a
b
b
c
c
d
d
a
Purity control
corrects this area.
Disc magnets or rotatable
disc magnets correct these
areas (a-d).
Deflection yoke positioning
corrects these areas.
4 pole magnet
RV705
H. STAT
RV1800
G2 (SCREEN) 
Center dot
R     G     B
G
R
B
– 8 –
KV-AW21M50/M81/P50
RM-GA002
1. (Moving vertically), adjust the 4 pole magnet to converge
red, green and blue dots in the center of the screen.
2. Tilt the 4 pole magnet and adjust static convergence to
open or close the 4 pole magnet.
3. When the 4 pole magnet is moved in the direction of
arrow A and B, the red, green and blue dots moves as
shown below:
Moved RV750 (H.STAT)
b) Horizontal Static Convergence
If the blue dots does not converge with the red and green
dots, use the 6 pole magnet to adjust in the manner
described below.
R
R
G
G
B
B
A
B
B
A
R G
B
R
G
B
R
G B
R
B
R
G
G
G
B
R
B
6 Pole Magnet
4 pole Magnet
DY pocket
Purity
6 Pole
Magnet
4 Pole
Magnet
c) Convergence Rough Adjustment
Preparation :
• Before starting this adjustment, adjust the horizontal
and vertical static convergence.
Input cross hatch pattern.
i)
TLH
Adjust the horizontal convergence of red and blue dots
by inserting TLH Correction Plate to the DY pocket (left
or right).
ii) YCH
Adjust YCH to balance Y axis.
iii) TLV
Adjust the vertical convergence of red and blue dots.
iv) XCV
Adjust XCV to balance X-axis.
d) Screen Corner Convergence
Affix a Piece A (90), Convergence Correct/Permaloy Assy
Correction to the misconverged areas.
TLV
R B
YCH
R
B
XCV
B
R
TLH
B
R
(VR1)
TLV1 (no need to adjust)
DY pocket
DY pocket
TLH Plate
(VR3)
TLV2
(XCV)
(VR2)
YCH
ON DY:
b
a
c
d
a-d : screen-corner
        misconvergence
a1
b1
c1
d1
a1~d1: Piece A (90), Convergence Correct
or
Permaloy Assy Correction
B
R
G
G
R
B
– 9 –
KV-AW21M50/M81/P50
RM-GA002
2-3. FOCUS ADJUSTMENT
FOCUS adjustment should be completed before W/B
adjustment.
1. Receive digital monoscope pattern.
2. Set Picture Mode to "DYNAMIC".
3. Adjust focus VR to obtain a just focus at the center of
the screen.
4. Change the receiving signal to white pattern and blue
back.
5. Confirm magenta ring is not noticeable. In case magenta
ring is obvious, then adjust FOCUS VR to balance
magenta ring and FOCUS.
2-4. G2 (SCREEN) ADJUSTMENT
1. Set the following condition:
– Picture and Brightness to "STANDARD".
– TV to Video mode.
– WHBL 016 "RGBB" to 01
2. Connect R, G, B of the C/CV board cathode to
oscilloscope.
3. Adjust Brightness to obtain the cathode value to the
value stated below.
4. Adjust SCREEN VR on the FBT until the scanning line
disappears.
5. Finally set WHBL 16 "RGBB" back to 00.
165 
± 2VDC
2-5. WHITE BALANCE ADJUSTMENT
1. Set to Service Mode.
2. Input white raster signal using signal generator.
3. Set the following condition:
Picture "DYNAMIC", PICT 006 "WTS" to 00.
4. At Highlight condition, select WHBL 03 "GDRV" and 04
"BDRV" with 1 and 4 button of the remote
commander then adjust the data with 3 and 6 button.
5. At Cutoff, select WHBL 000 "BKOR" and 001 "BKOG"
and adjust the data.
6. Perform adjustment at Highlight and Cutoff condition
until it reaches its target.
7. Write data into memory by pressing [MUTING] t -.
8. Finally set PICT 006 "WTS" back to its original data.
VIVID : 45000K+SMPCD
Center data:
X : 0.2444
Y : 0.2446
– 10 –
KV-AW21M50/M81/P50
RM-GA002
SECTION 3
CIRCUIT ADJUSTMENTS
3-1. ADJUSTMENTS WITH COMMANDER
Service adjustments to this model can be performed using the supplied remote commander RM-GA002.
a. ENTERING SERVICE MODE
With the unit on standby
This operation sequence puts the unit into service mode.
This screen display is:
b. METHOD OF CANCELLATION FROM SERVICE MODE
Set the standby condition (Press [POWER] button on the commander), then press [POWER] button again, hereupon it becomes
TV mode.
c. METHOD OF WRITE INTO MEMORY
1. Set to Service Mode.
2. Press 1 (UP) and 4 (DOWN), to select the adjustment item.
3. Change item by pressing 3, 6.
4. Press [MUTING] button to indicate WRITE on the screen.
5. Press - button to write into memory.
d. MEMORY WRITE CONFIRMATION METHOD
1. After adjustment, pull out the plug from AC outlet, and then plug into AC outlet again.
2. Turn the power switch ON and set to Service Mode.
3. Call the adjusted items again to confirm adjustments were made.
  t [DISPLAY] t 5 t [VOL $+% ] t [POWER]
item no.
service data
NVM
field
channel no./
category
in decimal
item name
in decimal
NG
service command
frequency
video input name
GEOM
006
HSIZ
031
x
SERVICE
60
S VIDEO 1
software
service data
reserved
power on time
release ID
version
in binary
for factory
color system
(decimal)
SUS01
0.69U
0001 1111
FF FF
NTSC3
65535
Status Byte
Status Byte
Flash DCXO
#1 SSD
#2 SSD
111 11 11 1 7 11
FG
xy 111
000000
000000
VDSP_C Flag
CO_LOCKED
VDSP
Detected Stereo Type (Direct Value from CZ_ Stereo_Mode)
S : for Sony
A : Aiwa
U S
: US/Latin/Taiwan
E U
: Europe
G A
: General Area
J P
: Japan
0 1 : serial no. of the M/P release
for each destination
111
Needed for Nicam DCXO aligment Purpose
xy
Value of x = 0 - Unknown, 1 - BTSC, 2 - A2, 3 - NICAM,
4 - KOREAN, 5 - Japan, 6 - AV Stereo
Value of y = 0 - Mono, 1 - Stereo, 2 - Bilingual, 4 - SAP/Single
1
, 4
Select the adjustment item.
r
3
, 6
Raise/lower the data value.
r
[MUTING]
Writes.
r
-
Executes the writing.
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