Display Position Adjustment; Mb Board Adjustments - Sony KV-13FM13 Service Manual

4-4. 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
(TP500 H. DRIVE).
3. Check H. Frequency for 15735 ± 200 Hz for NTSC.
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 TP508
(V OUT) or CN501 pin 6 (V DY+) and ground.
4. Check that V. Frequency shows 60 ± 4 Hz for NTSC.
DRIVE (RDRV)
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".
SERVICE RON 1
R ON: ON (1)
G ON: OFF (0)
B ON: OFF (0)
5. Select the DCOL item and set it to "0".
6. Connect an oscilloscope probe to CB board, J701 pin 11,
KR (RED OUT).
7. Select RDRV with 1 and 4 .
8. Adjust the value of RDRV with 3 and 6 for 70 ± 3 VDC.
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 and Color to normal values:
PICTURE: MAX
COLOR: CENTER
12. Press MUTING, then ENTER to save into the memory.
1: ON
0: OFF

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. Write to memory by pressing MUTING, then ENTER.
6. Check to see if the text is displayed on the screen.
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. Press MUTING then ENTER to save into the memory.
SUB HUE, SUB COLOR ADJUSTMENT
(SHUE, SCOL)
1. Input a color-bar signal.
2. Activate the Service Adjustment Mode.
3. Select the DCOL item and set the value to "0".
4. Connect an oscilloscope probe to CB board, CN705
Pin 4 (Blue Out).
5. Select the SHUE and SCOL item 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 < 0.1 Vp-p).
7. While showing the SCOL item, adjust the waveform with 3
6
and until the Þ rst and fourth bars show the same level
(V1 = V4 < 0.1 Vp-p).
8. Select the DCOL item and reset to 1.
9. Press MUTING and ENTER to save into the memory.
V. SIZE ADJUSTMENT (VSIZ)
1. Input a crosshatch signal.
2. Activate the Service Adjustment Mode.
3. Select the VSIZ item with 1 and 4 .
4. Adjust value of VPOS with 3 and 6 for the best vertical
center.
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KV-13FM13 / 13FM14
SERVICE DISP 15
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