Read Sony KV-27S42 Service Manual online
— 21 —
KV-27S42/27S46/27S66/29AL42/29AL42C/29AL66/
29AL66C/29SL42/29SL42C/29SL46/29XL42M
5-4. A BOARD ADJUSTMENTS
H. Frequency (Free Run) Check
1. Input a TV mode (RF) with no signal.
2. Connect a frequency counter to base of Q501
(TP-500 H. DRIVE).
3. Check H. Frequency for 15735 ± 200 Hz.
V. Frequency (Free Run) Check
1. Select video 1 with no signal input.
2. Set the conditions for a standard setting.
3. Connect the frequency counter on the A board to TP-508
(V OUT) or CN 501 pin
(V DY+) and ground.
4. Check that V. Frequency shows 60 ± 4 Hz.
Sub Contrast Adjustment (RDRV)
1. Input a color-bar signal and set the level to 75%.
2. In Standard mode, set PICTURE to maximum, COLOR to
minimum, and BRIGHTNESS to center.
3. Activate the Service Adjustment Mode.
4. Set both GON and BON items. Using
and
;
set each to the following values. Leave RON set to 1.
SERVICE RON 1
1: ON
0: OFF
0: OFF
R ON:
ON
(1)
G ON:
OFF (0)
B ON:
OFF (0)
5. Select the item DCOL item and set it to 0.
6. Connect an oscilloscope probe to CN301 pin
(RED
OUT).
7. Select RDRV with
and
.
8. Adjust the value of RDRV with
and
for
1.75 ± 0.05 Vp-p.
Black
White
1.75 ± 0.05 Vp-p
9. Reset the item DCOL to 1.
10. Reset GON and BON values to 1.
R ON:
ON
(1)
G ON:
ON
(1)
B ON:
ON
(1)
11. Reset Picture, Color, and Bright to normal values:
PICTURE:
MAX
COLOR:
CENTER
BRIGHT:
CENTER
12. Press
then
to save into the memory.
Display Position Adjustment (DISP)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select DISP with
and
.
4. Adjust values of DISP with
and
to adjust characters
to the center.
5. Write to memory by pressing
then
.
6. Check to see if the text is displayed on the screen.
SERVICE DISP 15
Sub Bright Adjustment (SBRT)
1. Input a crosshatch signal.
2. Activate the Service Adjustment Mode.
3. Set the PICTURE and BRIGHTNESS to minimum.
4. Select the SBRT item with
and
.
5. Adjust the values of SBRT with
and
to obtain a
faintly visible crosshatch.
6. Press
then
to save into the memory.
KV
-
D
est
in
at
io
n
ID
-0
ID
-1
ID
-2
ID
-3
ID
-4
ID
-5
ID
-6
ID
-7
1
27S42
US
25 145
15 235
11
3
0
64
2
27S42
CND
89 145
15 135
11
3
0
64
3
27S46
US
25 155
15 235
11
3
1
64
4
27S66
US
25 155
79 235
11
3
7
64
5
27S66
CND
89 155
79 155
11
3
7
64
6
29AL42
E
17 147 173 203 123
3
0
64
7
29AL42C
E
17 147 173 203 123
3
0
64
8
29AL66
E
17 151 237 203 123
3
7
64
9
29AL66C
E
17 151 237 203 123
3
7
64
10
29SL42
E
17 145 143 203 123
3
0
64
11
29SL42C
E
17 145 143 203 123
3
0
64
12
29SL46
E
17 155 143 203 123
3
1
64
13
29XL42M
MX
17 145 143 203 123
3
0
64
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