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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
to save into the memory.
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 RON 1
1: ON
0: OFF
6. Connect an oscilloscope probe to CN301 pin
(R OUT) and ground.
7. Select RDRV with
and
.
8. Adjust with
and
for 1.70 ± 0.05 Vp-p
Black
White
1.70 ± 0.05 Vp-p
9. Reset the item DCOL to 1.
10. Press
then
to save into the memory.
11. Return the following back to normal after adjustment.
PICTURE:
MAX
COLOR:
CENTER
BRIGHT:
CENTER
R ON:
ON (1)
G ON:
OFF (0)
B ON:
OFF (0)
Display Position Adjustment (DISP)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select DISP with
and
.
4. Adjust with
and
to adjust characters to the center.
5. Press
then
to save into the memory.
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. Set to Service Adjustment Mode.
3. Set the PICTURE and BRIGHTNESS to minimum.
4. Select the SBRT item with
and
.
5. Adjust with
and
to obtain a faintly visible crosshatch.
6. Press
then
to save into the memory.
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
and
.
6. Adjust with
and
for the V1 = V4 ± 0.2 Vp-p
(SCOL) and V2 = V3 ± 0.2 Vp-p (SHUE).
V1
V2
V3
V4
7. Reset the DCOL level to 1.
8. Press
then
to save into the memory.