A Board Adjustments - Sony TRINITRON KV-29FS100 Service Manual

4-6. A BOARD ADJUSTMENTS

4-6-1. H. FREQUENCY (FREE RUN) CHECK
1. Input a TV mode (RF) with no signal.
2. Connect a frequency counter to base of Q501
(TP-25 H. DRIVE) on the A Board.
3. Check H. Frequency for 15734 ± 400/-200 Hz.
4-6-2. 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-27 (V OUT) or CN501 pin 6
(V DY+) and ground on the A Board .
4. Check that V. Frequency shows 60 ± 5 Hz.
4-6-3. SUBCONTRAST ADJUSTMENT
(RDRV)
1. Input a color-bar signal and set the level to 75%.
2. Set in Standard mode.
3. Activate the Service Adjustment Mode. Set color min, pic max.
4. Set GON and BON items. Using 3 and 6 set each to the following
values. Leave RON set to "1".
Mode Category
service video
Signal
Type
ntsc
vchp
00000000 00000000
R ON: ON (1)
G ON: OFF (0)
B ON: OFF (0)
5. Connect an oscilloscope probe to C Board, CN705 pin 3 (Red Out)
(TP35).
6. Select SCON with 1 and 4 .
7. Adjust the value of SCON with 3 and 6 for 1.90 ± 0.05Vpp for the
27", 29", and 34" models, and 1.95 ± 0.05Vpp for the 38" model.
8. After adjusting SCON, if still out of spec, use RDRV resistor as a fine
adjustment.
9. Reset GON and BON values to "1".
R ON: ON (1)
G ON: ON (1)
B ON: ON (1)
10. Press MUTING then ENTER to save into the memory.
Item
Display
Data
Item
rdrv
26
4-6-4. 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.
Mode Category
service micro
Signal
Type
ntsc
vchp
4-6-5. 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.
— 25 —
KV-29FS100/29FV300/34FS100/
Display Item
Item Data
disp 48
00000000 00000000
34FV250/38FV250