Sony KV-28EW20B 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-887.
supplied remote Commander RM-887.
‘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 3 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 A Board]
or to the AGC pin of CN001 [mount side of A Board].
or to the AGC pin of CN001 [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 A board ]
Deflection System Adjustment
V SIZE
V LIN
S CORRECTION
V CENTRE
H CENTRE
H SIZE
PIN AMP
PIN PHASE
CORNER PIN
V ANGLE
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- 25 -
5-1. BLOCK DIAGRAMS (1)
LOWB
5
6
4
CN001
J401
(1/2)
(1/2)
77
63
5
7
4
3
2
1
5
4
RELAY
SWITCH
Q601
T603
SRT
16
15
17
18
18
16
1
2
15
8
11
12
IC602
ERROR AMP
1
2
PH601
ISOLATOR
+B
D638
RECT
AUDIO
VCC
+B
LOWB
3.3V REG
H-OUT
Q533
STBY
+3.3V
+3.3V
IC608
7
5
IC501
V OUTPUT
3
1
VD+
BOOST
REF
OUT
PIN OUT
Q532
6
5
4
3
2
1
T511
FBT
FV
ABL
12
3
4
1
5
6
13
8
9
11
10
7
V DY
V- DY+
DY ASSY
V- DY-
H DY
H- DY+
H- DY-
V- DY+
V- DY-
H- DY+
H- DY+
TO C BOARD
CN707
H1
200V
TO PICTURE
TUBE
2
3
6
5
+
-
+
-
1
7
IC531
PIN CORRECTION
EWD
HP
PROTECT
IN
VP
VD-
4
1
2
3
T531
HDT
IC609
STANDBY
POWER
HD
D
C
T602
D632
RECT
IC001
MICRO, VIDEO PROCESSOR,
ROM, AUDIO, VIDEO SWITCH
ROM, AUDIO, VIDEO SWITCH
CN606
CN510
VD
VG(H)
VS
+B
HV
CN508
XTAL OUT
RED
NVM WP
L AUDIO
TO SPEAKERS
A ( )
POWER SUPPLY, DEFLECTION,
SMALL SIGNAL BOARD,
AUDIO AMPLIFIER
IC601
D514
-15V RECT
L
1
2
1
3
DGC
DGC
DGC
DGC
CHECK
DGC CHECK
CN603
CN602
2
1
H- DY-
H- DY-
TO C BOARD
CN706
G2
IC604
DUAL DC REGULATOR
2
1
+8V
D608
RELAY
RY601
MAIN RECT
D601
1
3
4
6
7
9
CT
VSENSE
RT
TIMER
SS
OCP
12
VG(L)
Q606
Q607
6
5
4
7
3
LOWB
D624
D618
D619
VM VCC
QCP DETECT
Q602, 603, 604
1
4
CN1201
R AUDIO
64
XTAL IN
40
AUDIO MUTE
5
AUD OUT
78
+5V
STBY
6
5
2
3
+
-
+
-
7
1
+5V STBY
IC1201
AUDIO AMP
MUTE
1
IN/INL
10
3
/OUT W
H-DRIVE
Q535
68
IC401
AV LINK
+5V STBY
69
R0 56
A10
B10
1
2
3
6
G0 57
B0 58
IK 55
GREEN
BLUE
IK
EWD 17
VD- 18
VD+ 19
ABL 54
74
TO C BOARD
CN703
TO VM BOARD
CN1701
7
CN003
J401
(2/2)
(2/2)
NSC CORRECT
ROT COIL
AGC
SCL
SDA
VIDEO
IC004
SDA
6
SCL
5
7
WP
71 SCL
72 SDA
28
CVBS2/
CVBSY2
CVBSY2
3
AGC
53 B2/UIN
1
MODE1
80 MODE2
52 G2/YIN
51 R2/VIN
38 -/C4
50 INSSW2
32 CVBS1
37 -/CVBS4Y4
65 RESET
45 AUDIO 1
49 AUDIO 3
34 CVBS3
A8
A11
A7
B8
A15
A16
B20
B15
A20
A2
BLUE IN
MODE1
MODE2
GREEN IN
RED IN
C2 IN
BLK
V IN 1
Y/V IN 2
IC004
RESET
TU101
MUTE SW
Q212
AUDIO
AUDIO
STBY 70
2
FB
D513
+15V RECT
5
1
D625
14
OUT/L
12
/OUT R
6
/IN W
L OUT
L IN
R IN
R OUT
TO H2 BOARD
CN908
CN1200
1
CN1202
WOOFER
7
SDA
CS
SCL
AGC
3
IC201
MSP3410D-PP-B4
SC1 OUT R
37 SC1 OUT L
36
63
XTAL OUT
62
XTAL IN
47
SC3 IN R
46
SC3 IN L
31
DACM SUB
/C3 35
KEY
2
LED
6
SIRCS 67
CN405
7
6
4
LED
SIRCS
TO H8 BOARD
CN7150
A1
B1
A3
B3
SC1 OUT L
SC1 OUT R
SC2 OUT L
SC2 OUT R
SC2 OUT R
34 SC2 OUT L
33
R
AUDIO
J404
L
CVBS/Y
KEY
R
A19
VIDEO
CN406
TO H2 BOARD
CN906
1
4
6
8
9
6
5
3
2
C
CS
2
6
7
TO F6 BOARD
CN7601
TO D2 BOARD
CN8801
SW
SMART
CN512
2
6
DEF SW 75
+5V
STBY
8
CN501
+15V
-15V
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