Focus Adjustment; G2 (Screen) Adjustments; White Balance Adjustment - Sony KV-AR252M61 Trinitron Service Manual

KV-AR252M61
RM-W102

2-3. FOCUS ADJUSTMENT

FOCUS adjustment should be completed before W/B
adjustment.
(Except 34")
1. Receive digital monoscope pattern.
2. Set "Picture Mode" to "DYNAMIC".
3. a) Adjust focus VR so that the center of screen
becomes just focus(29",34").
b) Adjust focus VR so that the lion teeth
becomes just focus(25").
4. Change the receiving signal to white pattern and blue
back.
5. Confirm Magenta ring is not noticeable. Incase
magenta ring is obvious, adjust FOCUS VR to balance
between MAGENTA RING and FOCUS.
Focus
Screen
FLYBACK TRANSFORMER (T503)

2-4. G2 (SCREEN) ADJUSTMENTS

1. Set the PICTURE to Normal.
2. Put the VIDEO input mode without signals
3. Connect R,G,B of the C board cathode to the
oscilloscope.
4. Adjust cathode voltage to the value below.
5. Adjust G2 (screen) on the FBT until picture shows the
point before cut off.

2-5. WHITE BALANCE ADJUSTMENT

1. Set to Service Mode (Refer Section 3-1:
ADJUSTMENTS WITH COMMANDER).
2. Input white raster signal.
3. Set Picture to MINIMUM.
4. Select WHBL 002"RDRV" and adjust the value to 37
5. Select WHBL 003"GDRV" and 004 "BDRV"and adjust
the data for the best white balance in highlight
condition.
6. Adjust WHBL 000 "BKOR" and 001 "BKOG"and adjust
the data for best white balance cut-off condition.
7. Write into the memory by pressing [MUTING] then
SUB BRIGHT ADJUSTMENT
1. Set to service mode.
2. Brightness set to 50%, Picture: Minimum.
3. Select WHBL SBRT with
data with and
3 6
dimly lit.
4. Write into the memory by pressing [MUTING] then
5. Models cut-off: 0 IRE (25",34"), 10 IRE (29")
Slightly Glimmer: 10 IRE (25",34"), 20 IRE (29")
– 12 –
Cathode setting voltage:
170 V ± 2 (VDC)
and , and adjust 'SBRT'
1 4
so that the third stripe from right
.
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