Read Sony KV-29FS100 (serv.man3) Service Manual online
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KV-29FS100/29FV300/34FS100/
34FV250/38FV250
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
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
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.
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”.
service video rdrv
ntsc
vchp
Category
Display
Item
Mode
Item
Data
Signal
Type
00000000 00000000
26
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
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
R ON: ON
(1)
G ON: ON
(1)
B ON: ON
(1)
10. Press MUTING then ENTER to save into the memory.
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
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.
6. Check to see if the text is displayed on the screen.
service micro disp 48
ntsc
vchp
Category
Display
Item
Mode
Item
Data
Signal
Type
00000000 00000000
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
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.
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