Focus Adjustment; G2 (Screen) Adjustments; Sub Bright Adjustment; White Balance Adjustment - Sony TRINITRON KV-SZ252M50 Service Manual

3-3. FOCUS ADJUSTMENT

FOCUS adjustment should be completed before W/B
adjustment.
1. Receive digital monoscope pattern.
2. Set Picture Mode to "VIVID".
3. Adjust focus VR to obtain a just focus at the
center of the screen.
4. Change the receiving signal to white pattern
and blue back.
5. Confirm magenta ring is not noticeable. In case
magenta ring is obvious, then adjust FOCUS VR
to balance magenta ring and FOCUS.
Focus
Screen
FLYBACK TRANSFORMER (T503)

3-4. G2 (SCREEN) ADJUSTMENTS

1. Set the following condition:
- Picture and Brightness to "STANDARD".
- TV to Video mode.
- WHBL 013 "RGBB" to 01.
2. Connect R,G,B of the CV board cathode to
oscilloscope.
3. Adjust Brightness to obtain the cathode value
to the value stated below.
Cathode setting voltage:
175 V ± 2 (VDC)
4. Adjust SCREEN VR on the FBT until the scanning line
disappears.
5. Finally set WHBL 16 "RGBB" back to 00.
3-5.

SUB BRIGHT ADJUSTMENT

1. Set TV to RF mode.
2. Input PAL monoscope to RF mode (OTHER model) and
NTSC monoscope (NTSC model).
3. Set Brightness to 50% and Picture to "MINIMUM" in
"CUSTOM" mode.
4. Select WHBL 010 "SBRT" with 1 and 4 button and
adjust its data using 3 and 6 button so that the Cut Off
level and slightly glimmer is as the specification below:-
TV size
25"
29"
34"
28"
32"
5. Write into the memory by pressing [MUTING] t -.
6. Copy the adjusted data WHBL 010 "SBRT" to Video
mode.
7. Once adjustment is completed in RF and Video mode,
carry out adjustment in DVD mode. Repeat step 2 to 3.
Select WHBL 010 "SBRT" and adjust its data as the
specification below:-
TV size
25"
29"
34"
28"
32"

3-6. WHITE BALANCE ADJUSTMENT

1. Set to Service Mode.
2. Input white raster signal using signal generator.
3. Set the following condition:
Picture "VIVID", PICT 006 "WTS" to 00.
4. At Highlight condition, select WHBL 003 "GDRV"
and 002 "RDRV" with 1 and 4 button of the
remote commander then adjust the data with
3 and 6 button.
5. At Cutoff, select WHBL 000 "BKOR" and 001 "BKOG"
and adjust the data.
6. Perform adjustment at Hightlight and Cutoff condition
until it reaches its target.
7. Write data into memory by pressing [MUTING]t-.
8. Finally set PICT 006 "WTS" back to its original data.
– 17 –
KV-SZ252M50/M61/M81/N50/N60
Cut Off Slightly Glimmer
10 IRE 20 IRE + 2 steps
10 IRE 20 IRE + 2 steps
10 IRE 20 IRE + 2 steps
10 IRE 20 IRE
10 IRE 20 IRE
Cut Off Slightly Glimmer
10 IRE 20 IRE + 2 steps
10 IRE 20 IRE
10 IRE 20 IRE + 2 steps
10 IRE 20 IRE
10 IRE 20 IRE
RM-GA002