A Board Adjustments - Sony TRINITRON KV-20M42 Service Manual

KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C

5-4. A BOARD ADJUSTMENTS

H. Frequency Adjustment
1. Input a monoscope signal.
2. Set to Service Adjustment Mode.
3. Connect a frequency counter to base of Q501
(TP-500 H. DRIVE).
4. Select the item of AFC, set to 3 level (free run).
5. Check H. Frequency for the 15735 ± 200 Hz.
6. Select the AFC item again and adjust level to 0.
7. Press then
V. Frequency Adustment
1. Select video 1 with no signal input.
2. Set the conditions for a standard setting.
3. Connect the frequency counter across TP-508 or CN501
VDY (+) pin connector and ground.
4. Check that V. Frequency shows 60 ± 2 Hz.
Sub Contrast Adjustment (RDRV)
1. Input a color-bar signal.
2. Set the red color.
3. Set to Service Adjustment Mode.
4. Select the item DCOL level to 0.
5. Set the conditions as follows:
PICTURE: MAX
COLOR: MIN
BRIGHT: CENTER
R ON: ON (1)
G ON: OFF (0)
B ON: OFF (0)
SERVICE
6. Connect an oscilloscope probe to CN301 pin
(R OUT) and ground.
7. Select RDRV with
8. Adjust with and
9. Reset the item DCOL to 1.
10. Press then
to save into the memory.
RON 1
1: ON
0: OFF
and .
for 1.70 ± 0.05 Vp-p
White
1.70 ± 0.05 Vp-p
Black
to save into the memory.
11. Return the following back to normal after adjustment.
PICTURE:
COLOR:
BRIGHT:
R ON:
G ON:
B ON:
Display Position Adjustment (DISP)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select DISP with
4. Adjust with and
5. Press then
6. Check to see if the text is displayed on the screen.
SERVICE
Sub Bright Adjustment (SBRT)
1. Input a crosshatch signal.
2. Set to Service Adjustment Mode.
3. Set the PICTURE and BRIGHTNESS to minimum.
4. Select the SBRT item with
5. Adjust with and
6. Press then
Sub Hue, Sub Color Adjustment (SHUE, SCOL)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select the DCOL item and set the value to 0.
4. Connect an oscilloscope probe to CN301 Pin
(BLUE OUT) and ground.
5. Select SHUE and SCOL with
6. Adjust with and
(SCOL) and V2 = V3 ± 0.2 Vp-p (SHUE).
7. Reset the DCOL level to 1.
8. Press then
— 22 —
MAX
CENTER
CENTER
ON (1)
OFF (0)
OFF (0)
and .
to adjust characters to the center.
to save into the memory.
DISP 15
and .
to obtain a faintly visible crosshatch.
to save into the memory.
and .
for the V1 = V4 ± 0.2 Vp-p
V1 V4
V2 V3
to save into the memory.