Confi Rming Service Adjustment Changes; White Balance Adjustments; Picture Quality Adjustments - Sony Trinitron KV-21FS140 SCC-S79A-A Service Manual

3-3. CONFIRMING SERVICE ADJUSTMENT
CHANGES
1. After completing adjustments, pull out the plug from the AC outlet,
then replace the plug in the AC outlet again.
2. Access Service Adjustment Mode.
3. Using the buttons on the Remote Commander, locate the adjusted
items again to confi rm they were adjusted.

3-4. WHITE BALANCE ADJUSTMENTS

NOTE: FOCUS adjustment should be completed before White Balance
adjustment. (See 2-3. FOCUS)
1. Access Service Mode.
2. Input white raster signal using signal generator.
3. Set the following condition:
Picture "DYNAMIC", PICT 006, note value of "WTS"
then change to 00.
Press 2 or 5 to select the WHBL category.
4.
Press 1 or 4 to display the 03 "GDRV" and 04 "BDRV" items.
5.
Press 3 or 6 to adjust for the best white balance.
6.
7. At Cutoff, select WHBL 000 "BKOR" and 001 "BKOG" and adjust
the data.
8. Perform adjustment at Highlight and Cutoff condition until it reaches
its target.
9. Press MUTING then ENTER to save into the memory.
10. Set PICT 006 "WTS" back to its original data.

3-5. PICTURE QUALITY ADJUSTMENTS

P Max/Contrast Adjustment
1. Set TV to Video mode.
2. Set Picture mode to "CUSTOM".
3. Input PAL 100% CB to TV set (OTHERS), NTSC 75% CB (NTSC
model).
4. Set PICT 003 "PWL" to 00h WHBL 017 "BLBG" to 01h.
5. Set the following condition:
PICTURE 100%, COLOR 0%, BRIGHTNESS 50%
6. Connect an oscilloscope to pin
Press 1 or 4 to display SADJ 000 "PMAX", then adjust VR by
7.
pressing 3 or 6 until the spec below:
1.46 ± 0.03 Vp-p = For 21" without VM models
1.65 ± 0.03 Vp-p = With VM models except NTSC models
1.23 ± 0.03 Vp-p = NTSC models VM models
1.10 ± 0.03 Vp-p = For 21" NTSC non VM models
8. Select Wide Mode to "ON" in TV and Video mode and write "PMAX"
data - 8 steps (for models with V-Compression features only).
Press MUTING then 0 to write into memory.
9.
KV-21FS140
4 (R Output) of CN004.
VR
Black
10. Set "PWL" and "BLBG" back to initial data.
("PWL": 01h and "BLBG": 00h)
11. Press MUTING then 0 to write into memory.
Sub Color Adjustment
1. Set TV to Video mode.
2. Set Picture mode to "CUSTOM".
3. Input PAL 100% Color Bar (CB) to TV set (OTHER MODEL).
4. INPUT NTSC 75% CB to TV set (NTSC MODEL).
5. Set PICT 006 "WTS" to 00h and Intelligent Picture to "OFF".
6. Set the following condition:
PICTURE 50%, COLOR 50%, BRIGHTNESS 50%, HUE 50%,
SHARPNESS 50%
7. Connect an oscilloscope to pin
Press 1 or 4 to select SADJ 004 "SCOL", then adjust
8.
V =V =V (for PAL),
B2 B3 B4
6 , then write in the data +5 step offset.
VB1
VB2 VB3 VB4
VB2 = VB3 = VB4 (for PAL)
Press MUTING then 0 to write into memory.
9.
10. Set "WTS" back to original data and Intelligent Picture to "ON".
11. Copy no.9 data to PAL TV & DVD mode.
Sub Hue Adjustment
1. Set TV to Video mode.
2. Set Picture mode to "CUSTOM".
3. Input NTSC 3.58 CB to TV set.
4. Set the following condition:
PICTURE 50%, COLOR 50%, BRIGHTNESS 50%, HUE 50%,
SHARPNESS 50%
Press 1 or 4 to select service mode and - 5 step offset from SADJ
5.
004 "SCOL".
6. Connect oscilloscope to pin
Press 1 or 4 to select SADJ 001 "SHUE", then press 3 or 6 to
7.
adjust the data.
Press MUTING then 0 to write into memory.
8.
Press 1 or 4 to select SADJ 004 "SCOL" and +5 step offset, then
9.
press MUTING then 0 to write into memory .
10. Select TV channel with 3.58 and repeat item (3) to (7) and +1 step
data offset.(NTSC model)
11. Press MUTING then 0 to write into memory.
2 (B Output) of CN004.
by pressing 3 or
VB1 = VB4 (for NTSC)
VB1 VB2 VB3 VB4
VB1 = VB4 (for NTSC)
(Difference is within 70mV)
2
(B output) of CN004.
KV-21FS140
18