Focus Adjustment; G2 (Screen) Adjustments; White Balance Adjustment; Sub Bright Adjustment - Sony Trinitron KV-BT21M80 Service Manual

2-3.

FOCUS ADJUSTMENT

FOCUS adjustment should be completed before the W/B
adjustment:
1. Receive digital monoscope pattern.
2. Set picture mode: DYNAMIC.
3. Adjust focus VR to obtain a just focus at the center of
the screen.
4. Change receiving signal to white pattern and blue
back.
5. Confirm MAGENTA RING is not noticeable. Incase
magenta ring is obvious, then adjust FOCUS VR to
balance magenta ring and FOCUS.
FOCUS
SCREEN
FLYBACK TRANSFORMER (T802-14")
FLYBACK TRANSFORMER (T801-21")
2-4.

G2 (SCREEN) ADJUSTMENTS

1. Set the PICTURE & BRIGHTNESS to STANDARD.
2. Put the Video input mode signal.
3. Connect R,G,B of the C board cathode to
oscilloscope.
4. Adjust Brightness to obtain the cathode value to
value below.
5. Adjust G2 (screen) on the FBT until picture shows
the point before cut off.
165 ± 2VDC
– 11 –
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 <DYNAMIC mode>
4. Select RDRV (02) with 1 and 4 and fixed the value
to 25 with 3 and 6.
5. Adjust WHBL GDRV (03) and BDRV (04) with 1 and
4 and adjust the data with 3 and 6 for best white
balance in Highlight condition.
6. Write into the memory by pressing [MUTING] then -.
7. Adjust WHBL BKOR (00) and BKOG (01) with 1 and
4 and adjust the level with 3 and 6 for best white
balance cut-off condition.
8. Write into memory by pressing [MUTING] then -.
2-6.

SUB BRIGHT ADJUSTMENT

1. Set to service mode.
2. Brightness set to 50%, Picture....Minimum
3. Select WHBL SBRT (10) with 1 and 4 and adjust
SBRT (10) data with 3 and 6 so that the third
stripe from right dimly lit.
4. Write into the memory by pressing [MUTING] then -.
5. GA models Cut-off
Slightly Glimmer : 20 IRE
KV-BT21M80
RM-W101
: 10 IRE