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Mb Board Adjustments - Sony KV-21FS105 Service Manual

Trinitron color television.
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4-6. MB 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, and 15650 ± 200 Hz for
PAL-N.
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 to TP-508 (V OUT) or CN501 pin 6
(V DY+) and ground on the A Board .
4. Check that V. Frequency shows 60 ± 4 Hz for NTSC,
50 ± 4 Hz for PAL-N.
Drive (RDRV) Adjustment
1. Input a color-bar signal and set the level to 75%.
2. In Standard mode, set PICTURE to maximum and COLOR to
minimum.
3. Activate the Service Adjustment Mode.
4. Set both GON and BON items. Using 3 and 6 set each to the
following values: (Leave RON set to "1".)
Mode
SERVICE
R ON: ON
G ON: OFF
B ON: OFF
5. Select DCOL item and set it to "0".
6. Connect an oscilloscope probe to C Board, J701 pin 12 (KR)
(Red Out).
7. Select RDRV with 1 and 4 .
8. Adjust the value of RDRV with 3 and 6 for 86.5 ± 2 VDC.
86.5 ± 2 VDC
9. Reset the item DCOL to "1"
10. Reset GON and BON values to "1".
R ON: ON
G ON: ON
B ON: ON
11. Reset PICTURE and COLOR to normal values.
12. To save into memory, press MUTING then ENTER .
KV-21FS105
Item
Display
Data
Item
RON
1
(1)
(0)
(0)
(1)
(1)
(1)
Display Position Adjustment (DISP)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select DISP with 1 and 4 .
4. Adjust values of DISP with 3 and 6 to adjust characters to the
center.
5. To save into memory, press MUTING then ENTER .
6. Check to see if the text is displayed on the screen.
Mode
SERVICE
Sub Bright Adjustment (SBRT)
1. Input a monoscope signal.
2. Activate the Service Adjustment Mode.
3. Set the PICTURE and BRIGHTNESS to minimum.
4. Select the SBRT item with 1 and 4 .
5. Adjust the values of SBRT with 3 and 6 to obtain a faintly visible
crosshatch.
6. To save into memory, press MUTING then ENTER .
Sub Hue, Sub Color Adjustment
(SHUE, SCOL)
1. Input color-bar signal and set level to 75%.
2. Activate the Service Adjustment Mode.
3. Select the DCOL item and set the value to "0".
4. Connect an oscilloscope probe to the C Board,
CN17152 Pin 4 .
5. Select SHUE and SCOL with 1 and 4 .
6. While showing the SHUE item, adjust the waveform with 3 and 6
until the second and third bars show the same level
(V2 = V3 ± 0.2 Vp-p).
7. While showing the SCOL item, adjust the waveform with 3 and 6
until the fi rst and fourth bars show the same level
(V1 = V4 ± 0.2 Vp-p).
NOTE: SCOL must be adjusted in all modes NTSC, PAL-M, and PAL-N.
V1 V2 V3 V4
9. Select the DCOL item and reset to "1".
10. To save into memory, press MUTING then ENTER .
KV-21FS105
Display
Item
Item
Data
DISP
15
20

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