Mb Board Adjustments - Sony TRINITRON KV-20FS12 Service Manual
Sony trinitron color tv service manual
Hide thumbs
Also See for TRINITRON KV-20FS12:
- Specifications (1 page) ,
- Dimensions (1 page) ,
- Training manual (53 pages)
Table of Contents
Advertisement
KV-20FS12/20FV12/21FE12/A/C/21FM12/21FV12/C
5-4. 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
(TP-500 H. DRIVE).
3. Check H. Frequency for 15735 ± 200 Hz, and 15650 ± 200
Hz for PAL-N (KV-21FE12A ONLY.)
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
4. Check that V. Frequency shows 60 ± 4 Hz
for NTSC, 50 ± 4 Hz for PAL-N (KV-21FE12A ONLY).
Drive (RDRV) Adjustments
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
set each to the following values. Leave RON set to "1".
SERVICE
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 C board, J701 pin 12
(KR) (RED OUT).
7. Select RDRV with
8. Adjust the value of RDRV with
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 (1)
G ON:
ON (1)
B ON:
ON (1)
(V DY+) and ground.
and
;
RON
1
1: ON
0: OFF
and
.
and
for
11. Reset Picture and Color to normal values:
PICTURE: MAX
COLOR:
CENTER
12. Press
then
Display Position Adjustment (DISP)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select DISP with
4. Adjust values of DISP with
to the center.
5. Write to memory by pressing
6. Check to see if the text is displayed on the screen.
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
5. Adjust the values of SBRT with
faintly visible crosshatch.
6. Press
then
Sub Hue, Sub Color Adjustment (SHUE, SCOL)
1. Input a 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 C Board, CN1752
Pin
.
5. Select the SHUE and SCOL item with
6. While showing the SHUE item, adjust the waveform with
and
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
and
until the first and fourth bars show the same level
(V1 = V4 ± 0.2 Vp-p).
8. Input RF PAL-M and PAL-N color-bar and repeat steps 1-
7 for each. (KV-21FC12A ONLY).
— 24 —
to save into the memory.
and
.
and
to adjust characters
then
DISP
15
and
.
and
to obtain a
to save into the memory.
and
.
V1
V2 V3
V4
.
Hide quick links:
Advertisement
Table of Contents
