Picture Quality Adjustment; P Max/Contrast Adjustment; Sub Color Adjustment; Sub Hue Adjustment - Sony TRINITRON KV-SZ25M61 Service Manual

KV-SZ25M61/N60
RM-GA002

3-3. PICTURE QUALITY ADJUSTMENT

3-3-1. P MAX / CONTRAST ADJUSTMENT
1. Set TV to Video mode.
2. Set Picture mode to "CUSTOM".
3. Input PAL 100% Color Bar to TV set (OTHER model)
and NTSC 75% Color Bar (NTSC model).
4. Set the following condition:
Picture 100%, Color 0%, Brightness 50%.
5. Connect an oscilloscope to pin 4 (R output) of CN004.
6. Go to service mode and set PICT 003 "PWL" to 00h and
WHBL 017 "BLBG" to 01h.
7. Select SADJ 000 "PMAX" with 1 and 4 button of the
commander then adjust VR with spec with 3 and 6
button until reach the spec below:
34"
VR
29"
25"
8. Then copy the adjusted PMAX data to TV mode.
9. Select Wide mode to "ON" in TV and Video mode and
write "PMAX" data -6 steps
(for models with V-Compression features only).
10. Press [MUTING] t - to write the data.
11. Set "PWL" and "BLBG" back to initial data.
("PWL" : 01h and "BLBG" : 00h).
12. Finally press [MUTING] t - to write the data.

3-3-2. SUB COLOR ADJUSTMENT

1. Set TV to Video mode.
2. Set Picture mode to "CUSTOM".
3. Input PAL 100% Color Bar to TV.
4. Set the following condition:
Picture 100%, Color 50%, Brightness 50%, Hue 50%
and Sharpness 50%
5. Set PICT 006 "WTS" to 00h.
6. Connect an oscilloscope to pin 2 (B output) of CN004 A
Board.
7. Select SADJ 004 "SCOL" with 1 and 4 button of the
commander then adjust with 3 and 6 so that
VB2=VB3=VB4 (for PAL) then write in the data as below:
Add 2 steps to "SCOL" (PAL) – 25"
Add 3 steps to "SCOL" (PAL) – 29"
Add 6 steps to "SCOL" (PAL) – 34"
VB1
VB2 = VB3 = VB4 (for PAL)
VR
Black
PAL NTCS
1.85 0.03Vpp
1.57 0.03Vpp
1.85 0.03Vpp
VB2 VB3 VB4
8. Copy "SCOL" 50(PAL) video data to "SCOL" 50 (SECAM)
video.
9. Then copy "SCOL" 50(PAL) video data and "SCOL"
50(SECAM) video data to "SCOL" 50(PAL) and "SCOL"
50(SECAM) TV table.
10. For NTSC model input NTSC 75% Color Bar to TV and
repeat step no. 4 to 6.
11. Select SADJ 004 "SCOL" with 1 and 4 button of the
commander then adjust using 3 and 6 so that
VB1=VB4 then write in the data as below:
Add 5 steps to SCOL (NTSC) – 25"
Add 4 steps to SCOL (NTSC) – 29"
Add 6 steps to SCOL (NTSC) – 34"
VB1 VB2 VB3 VB4
VB1 = VB4 (for NTSC)
(Difference is within 70mV)
12. Copy "SCOL" 60(NTSC) video data to "SCOL" 60(NTSC)
TV .
13. Finally copy "SCOL" 50(PAL) and "SCOL" 60(NTSC) data
to "SCOL" 50(PAL) and 60(NTSC) in DVD mode.
14. Then press [MUTING] t - to write the data.
15. Set PICT 006 "WTS" back to original data.

3-3-3. SUB HUE ADJUSTMENT

1. Set TV to Video mode.
2. Input NTSC 3.58 Color Bar to TV set.
3. Set the following condition:
Picture 100%, Color 50%, Brightness 50%, Hue 50%,
Sharpness 50%.
4. Connect oscilloscope to pin 2 (B output) of CN004.
5. Set to service mode and select SADJ 001 "SHUE"
(except SW252M60K and SW292M60K) and YC 013
"TINT" (SW252M60K and SW292M60K) with 1 and 4
button then adjust to VB1=VB2=VB3=VB4 using 3 and
6 button.
6. Press [MUTING] t - to write the data.
7. Select TV channel with NTSC 3.58 and perform step 3
to 6.
8. For single system model with NTSC 4.43, select TV
channel with NTSC 4.43 and perform step 3 to 6.
9. Once adjustment is completed in Video mode, carry out
adjustment in DVD mode. Input NTSC 3.58 Color Bar.
10. Connect oscilloscope to pin 2 (B output) of CN004.
11. Set to service mode and adjust service item YC 013
"TINT" with 1 and 4 button until VB1=VB2=VB3=VB4.
12. Press [MUTING] t - to write the data.
VB1
The highest level of VB1, VB2, VB3 and VB4 should
be aligned at the same line.
The ideal difference between VB2 and VB3 is within + 80mV.
– 28 –
VB3 VB4
80mV
VB2
Illustration 1