Sony KV-21M5D Service Manual ▷ View online
17
a-d: screen-corner
convergence defect
convergence defect
a
b
c
d
c
a
d
b
Fit the permalloy assembly to the rear
of the CRT to correct the area at fault.
of the CRT to correct the area at fault.
Permalloy
FOCUS
(4)
Screen corner convergence.
•
If you are unable to adjust the corner convergence properly,
this can be corrected by the use of permalloy assemblies.
this can be corrected by the use of permalloy assemblies.
3-3. Screen [G2], White balance
G2 Setting
1.
Input a dot signal from the pattern generator.
2.
Set the Picture, Brightness and Colour to minimum.
3.
Apply 170Vdc from an external power supply to the
R, G and B cathodes of the CRT.
R, G and B cathodes of the CRT.
4.
Whilst watching the picture, adjust the G2 control [RV
SCREEN] located on the FBT to the point just before the fly-
back return lines disappear.
SCREEN] located on the FBT to the point just before the fly-
back return lines disappear.
White balance adjustment
1.
Input a ‘PAL’ all-white signal from the pattern generator.
2.
Enter into the Service Mode.
3.
Enter into the ‘Picture’ service menu.
4.
Select the ‘Green drive’ and adjust so that the White Balance
becomes optimum.
becomes optimum.
5.
Select the ‘Blue drive’ and adjust so that the White Balance
becomes optimum.
becomes optimum.
6.
Set the Picture to MIN.
7.
Set the ‘R-cut-off’ to 07.
8.
Adjust the ‘G-cut-off’, and the ‘B-cut-off’ so that the White
Balance becomes optimum.
Balance becomes optimum.
10.
Press the
button to return to TV operation.
3-4. FOCUS
1.
Input a Phillips colour pattern
2.
Set the picture settings to normal.
3.
Adjust the focus control located on the Flyback transformer to
bring the centre of the screen into focus.
bring the centre of the screen into focus.
Note :Bring only the centre area of the screen into focus, switch to an
all-white pattern and confirm that the magenta ring is hardly
noticed. To obtain optimum focus balance the focus setting
between optimum screen centre focus and a reduced magenta
ring level.
noticed. To obtain optimum focus balance the focus setting
between optimum screen centre focus and a reduced magenta
ring level.
PICTURE
R - Drive
Adj
G - Drive
Adj
B - Drive
Adj
R - cut - off
Adj
G - cut - off
Adj
B - cut - off
Adj
ID - start
02
ID - stop
01
ID - level
01
Bellfo
Adj
Sub Colour
Adj
Sub Brightness
Adj
SCREEN
18
SECTION 4
CIRCUIT ADJUSTMENTS
(ON SCREEN
DISPLAY)
DISPLAY)
5
(DIGIT 5)
+
(VOLUME +)
(TV)
i
+
4-1. ELECTRICAL ADJUSTMENTS
Service adjustments to this model can be performed
using the supplied Remote Commander RM-883.
using the supplied Remote Commander RM-883.
HOW TO ENTER INTO SERVICE MODE
1.
Turn on the main power switch and enter into the stand-by
mode.
mode.
2.
Press the following sequence of buttons on the Remote
Commander.
Commander.
•
‘TT--’ will appear in the upper right corner of the
screen.
Other status information will also be displayed.
screen.
Other status information will also be displayed.
3.
Press ‘MENU’ on the remote commander to obtain the
following menu on the screen.
following menu on the screen.
4.
Move to the corresponding adjustment item using the ‘Green’
[up] or ‘Blue’ [down] buttons on the Remote Commander.
[up] or ‘Blue’ [down] buttons on the Remote Commander.
5.
Press the ‘Yellow’ button to enter into the required menu item.
6.
Press the ‘Menu’ button on the Remote Commander to quit the
Service Mode when all adjustments have been completed.
Service Mode when all adjustments have been completed.
Note :The data shown in the ‘TV STATUS’ table is dependant on
destination and country.
TEST MENU
> Picture
Geometry
Sound
TV Status
AGC Adjust
Technical
PICTURE
R - Drive
Adj
G - Drive
Adj
B - Drive
Adj
R - cut - off
Adj
G - cut - off
Adj
B - cut - off
Adj
ID - start
02
ID - stop
01
ID - level
01
Bell-f0
Adj
Sub Colour
Adj
Sub Brightness
Adj
GEOMETRY
V centre
Adj
V size
Adj
V Lin
Adj
S Corr
Adj
H Cent
Adj
H Size
Adj
Pin Amp
Adj
Corner Pin
Adj
Pin Phase
Adj
V Bow
Adj
V Angle
Adj
Upper V Lin
Adj
Lower V Lin
Adj
Left HBLK
07
Right HBLK
07
CD Mode (AV)
01
SOUND
Nicam Error Lower
20
Nicam Error Upper
80
Nicam Error Rate
xx
[Status only]
AGC Gain Level
xx
[Status only]
TV STATUS
Destination
A/L/E/U/D/B/K/R
Text Language
East/West
19
Same Level
B-Out Waveform
JW130
11
TUNER
17
L103
IC101
RV101
A
A Board component side
25" 2.21V +/- 0.01V
29" 2.52V +/- 0.01V
29" 2.52V +/- 0.01V
R - out Waveform
SUB BRIGHTNESS ADJUSTMENT
1.
Input a Phillips colour pattern.
2.
Press ‘TEST’ ‘TEST’ 13 on the Remote Commander.
3.
Adjust the ‘Sub-Brightness’ data so that there is barely a
difference between the 0 IRE and 10 IRE signal levels.
difference between the 0 IRE and 10 IRE signal levels.
SUB CONTRAST ADJUSTMENT
1.
Input a video signal that contains a small 100% white area on a
black background
black background
2.
Set the picture control to maximum. [‘TT01’]
3.
Connect an oscilloscope to Pin 1 of CN504 [A Board].
4.
Enter into the ‘Picture’ service menu.
5.
Adjust the ‘R - Drive’ data to obtain the following waveform.
SUB COLOUR ADJUSTMENT
1.
Receive a PAL colour bar signal.
2.
Connect an oscilloscope to Pin 3 of CN504 [A Board].
3.
Enter into the ‘Picture’ service menu.
4.
Adjust the ‘Sub Colour’ data so that the Cyan, Magenta and
Blue colour bars are of equal levels as indicated below.
Blue colour bars are of equal levels as indicated below.
Note: Ensure that no signal is applied to the Antenna socket while
carrying out the following IF adjustments.
SYSTEM B/G, D/K, I & L I.F ADJUSTMENT
1.
Input a 38.9Mhz carrier signal at 100dBuV to Pin 11 [IF
output] of the tuner [TU101].
output] of the tuner [TU101].
2.
Measure the voltage at Pin 17 of [IC101].
3.
Adjust L103 [A Board] to obtain a voltage of 2.5V +/- 0.3V.
SYSTEM L BAND 1 I.F ADJUSTMENT
1.
Input a 34.0MHz carrier signal at 100dBuV to Pin 11 [IF
output] of the tuner [TU101].
output] of the tuner [TU101].
2.
Select ‘system L’ + C00 [channel 00].
3.
Measure the voltage at Pin 17 [IC101].
4.
Adjust RV101 [A Board] to obtain a voltage of 2.5V +/- 0.3V.
TUNER AGC ADJUSTMENT
1.
Receive a signal of 65dBuV / 75 ohm terminated, via the tuner
antenna socket.
antenna socket.
2.
Connect a voltmeter to JW130 [A Board].
3.
Enter into the ‘Test Menu’.
4.
Select the ‘AGC Adjust’ menu item.
5.
Adjust the data using the Yellow and Green buttons on the
Remote Commander to obtain a voltage of 3.0V +/- 0.2V.
Remote Commander to obtain a voltage of 3.0V +/- 0.2V.
TECHNICAL
GD - Secam
30
BD - Secam
31
RC - Secam
11
GC - Secam
19
BC - Secam
10
GD - Sports
30
BD - Sports
36
RC - Sports
14
GC - Sports
15
BC - Sports
17
Y - Delay (AV)
07
20
V SIZE
V LIN
S CORRECTION
V CENTRE
H CENTRE
H SIZE
PIN AMP
PIN PHASE
CORNER PIN
V ANGLE
Before adjustment
After adjustment
BELL FILTER ADJUSTMENT (
Secam models only
).
Note : Ensure that the TV set has been powered up for at least
1 minute to allow for drift before carrying out the following
adjustment.
adjustment.
1.
Input a video SECAM Colour Bar signal via AV1.
2.
Connect an oscilloscope to pin 1 of CN504 [R-OUT] on the
A board.
A board.
3.
Enter into the ‘Picture’ menu and select ‘Bell-f0’.
4.
Decrease the register of ‘Bell-f0’ until the following waveform
change between RED and BLUE is obtained.
change between RED and BLUE is obtained.
5.
When the correct waveform has been obtained add an
additional 7 steps to the register.
additional 7 steps to the register.
DEFLECTION SYSTEM ADJUSTMENT
1.
Enter into the ‘Geometry’ service menu.
2.
Select and adjust each item in order to obtain the optimum
image.
image.
GEOMETRY
V centre
Adj
V size
Adj
V Lin
Adj
S Corr
Adj
H Cent
Adj
H Size
Adj
Pin Amp
Adj
Corner Pin
Adj
Pin Phase
Adj
V Bow
Adj
V Angle
Adj
Upper V Lin
Adj
Lower V Lin
Adj
Left HBLK
07
Right HBLK
07
CD Mode (AV)
01
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