A Board Adjustments - Sony TRINITRON KV-34FV310 Service Manual

4-6. A 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-25 H. DRIVE) on the A Board.
3. Check H. Frequency for 15734 ± 400/-200 Hz.
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 ± 4 Hz.
SUBCONTRAST ADJUSTMENT (RDRV)
1. Input a color-bar signal and set the level to 75%.
2. Set in Pro mode.
3. Activate the Service Adjustment Mode.
4. Set GON and BON items. Using 3 and 6 set each to the following
values. Leave RON set to "1".
Display
Mode Category
service video rdrv
Signal
Type
ntsc
vchp
00000000 00000000
R ON: ON (1)
G ON: OFF (0)
B ON: OFF (0)
5. Select SCON with 1 and 4 .
6. Connect an oscilloscope probe to C Board, CN705 Pin 3 Blue Out.
7. Adjust the value of SCON with 3 and 6 for
1.90 ± 0.01Vpp.
8. Reset GON and BON values to "1".
R ON: ON (1)
G ON: ON (1)
B ON: ON (1)
9. Press MUTING then ENTER to save into the memory.
10. After adjusting SCON, if still out of xpec, use RDRV resistor as a
fi ne adjustment.
Item
Data
Item
26
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
service micro
Signal
Type
ntsc
vchp
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.
SUB HUE, SUB COLOR ADJUSTMENT
(SHUE, SCOL)
[RF], [VIDEO] [VIDEO MODE PRO]
1. Input color-bar signal at 75%.
2. Set screen to Pro Mode.
3. Activate the Service Adjustment Mode.
4. Set (PIC) to 100% and (COL) to 50%.
5. Connect an oscilloscope probe to C Board, CN705 Pin 4 Blue Out.
6. Select the SHUE and SCOL item with 1 and 4 .
7. While showing the SHUE item, adjust the waveform with 1 and 4 until
the second and third bars show the same level
(V2 = V3 + 0.2Vpp).
8. While showing the SCOL item, adjust the waveform with 3 and 6 until
the fi rst and fourth bars show the same level
(V1 = V4 + 0.2Vpp).
9. For Trinorma models inspect each system NTSC, PAL M & N.
10. Press MUTING then ENTER to save into the memory.
— 26 —
KV-34FV310/38FV310
Display Item
Category
Item Data
disp 48
00000000 00000000
V1 V2 V3 V4