Sony KD-28DX40U Service Manual ▷ View online
- 21 -
Sub Brightness Adjustment
1.
Input a Monoscope 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.
1.
Input a video signal that contains a small 100% white area on a
black background.
black background.
2.
Connect an digital voltmeter to Pin 10 of J701 [C Board].
3.
Adjust the Sub-Contrast [‘TT11’] to obtain a voltage of
105 +/- 5V.
105 +/- 5V.
Sub Contrast Adjustment
4-1. Electrical Adjustments
Service adjustments to this model can be performed using the
supplied remote Commander RM-932.
supplied remote Commander RM-932.
‘TT—’ will appear in the upper right corner of the screen.
Other status information will also be displayed.
Other status information will also be displayed.
3.
Press ‘MENU’ on the remote commander to obtain the following
menu on the screen.
menu on the screen.
4.
Move to the corresponding adjustment item using the
up or down arrow buttons on the Remote Commander.
up or down arrow buttons on the Remote Commander.
5.
Press the right arrow 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 :
•
Before performing any adjustments ensure that the correct model
has been selected in the ‘Model Setting’ menu.
has been selected in the ‘Model Setting’ menu.
•
After carrying out the service adjustments, to prevent the
customer
accessing the ‘Service Menu’ switch the TV set OFF and then
ON.
customer
accessing the ‘Service Menu’ switch the TV set OFF and then
ON.
i+
5
+
(ON SCREEN (DIGIT 5) (VOLUME +) (TV)
DISPLAY)
DISPLAY)
SECTION 4
CIRCUIT ADJUSTMENTS
How to enter into the Service Mode
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Turn on the main power switch and enter into the stand-by mode.
2.
Press the following sequence of buttons on the Remote
Commander.
Commander.
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- 22 -
Sub Colour Adjustment
1.
Receive a PAL colour bar signal.
2.
Connect an oscilloscope to Pin 5 of CN003 [A Board].
3.
Enter into the ‘Service’ 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.
Same Level
B-Out Waveform
Tuner AGC Adjustment
Note:
There should be no need to adjust the AGC as this is pre-
adjusted during manufacture of the FRONTEND. If the AGC
does need adjustment then follow steps 1. to 4. below.
adjusted during manufacture of the FRONTEND. If the AGC
does need adjustment then follow steps 1. to 4. below.
1.
Receive a signal of 62dBuV / 75 ohm terminated via the tuner
antenna socket.
antenna socket.
2.
Connect a voltmeter to pin1 of TU101 [print side of A1 Board]
or to the AGC pin of CN301 [mount side of A Board].
or to the AGC pin of CN301 [mount side of A Board].
3.
Confirm that the AGC voltage is 3.5volts +/- 0.3volts.
4.
If adjustment is required, then re-adjust the AGC variable
resistor (located at the top rear of the FRONTEND) to obtain
a voltage of 3.5V +/- 0.3V.
resistor (located at the top rear of the FRONTEND) to obtain
a voltage of 3.5V +/- 0.3V.
1.
Enter into the ‘Geometry’ service menu.
2.
Select and adjust each item in order to obtain the optimum image.
[ Print side of A1 board ]
Deflection System Adjustment
V SIZE
V LIN
S CORRECTION
V CENTRE
H CENTRE
H SIZE
PIN AMP
PIN PHASE
CORNER PIN
V ANGLE
TU101
Pin 1
Pin 1
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- 24 -
5-1. BLOCK DIAGRAMS (1)
9
VM AMP
Q1701
VM AMP
BUFFER
BUFFER
Q1704, 1705
VM OUT
Q1708, 1711
NECK ASSY
VM OUT
CN1718
Q.P.
VM
CN1702
8
TO
A BOARD
CN510
GND
VM
QP OUT
Q1841
1
2
3
4
Q.P.+
Q.P.-
7
2
IC1902
DF/DQP/TIMING
+
-
3
1
2
+
-
5
7
6
3
TO
A BOARD
CN503
+9V
IC1901
COMPARATOR
CN1809
1
TO
A BOARD
CN509
DF
15V PULSE
VM ( )
VELOCITY MODULATION,
DYNAMIC FOCUS AND DQP
DYNAMIC FOCUS AND DQP
6
IC1701
LOW B
V-PULSE
I
CN1701
TO F6 BOARD
CN7601
2
AC IN
CN3601
F3 ( )
AC INPUT, FUSE
1
AC IN
4
3
1
2
2
1
CN3603
AC OUT
AC OUT
TO A BOARD
CN606
T3603
TO A BOARD
CN406
TO A BOARD
CN1200
VIDEO
HEADPHONES
R
L
WOOFER MUTE
CN908
R IN
R OUT
L OUT
CN906
AUDIO L
AUDIO R
Y/CVBS
C
1
2
3
5
6
9
4
2
J900
1
2
4
3
Y/C
CN900
H2( )
AUDIO IN, Y/C IN,
HEADPHONE IN
J900
6
L IN
KEY 1
S900
S901
S902
AC OUT
1
2
POWER
S7601
CN7601
CN7602
1
2
F6 ( )
POWER SWITCH
AC OUT
AC IN
AC IN
TO F3 BOARD
CN3601
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