Focus; Screen (G2); White Balance Adjustments - Sony TRINITRON KV-27FV300 Service Manual

2-3. FOCUS

1. Input monoscope signal.
2. Set user controls to normal.
3. Set video mode to STANDARD.
4. Set the PICTURE to maximum.
5. Adjust at 325 Mark for best center/corner focus balance.
6. Receive an entire white signal. Make sure Magenta Ring is at an
acceptable level.
Focus

Screen (G2)

325 MARK
35
325
35 MARK
CENTER
CIRCLE
2-4. SCREEN (G2)
1. Input dot pattern from the pattern generator.
2. Set the user controls to NORMAL.
3. Attach the G2-Jig to the C Board.
4. Adjust RCUT, GCUT, BCUT, and SBRT in service mode with an
oscilloscope so that voltages on the red, green, and blue cathodes
are 170 ± 2.0Vdc.
5. Observe the screen and adjust SCREEN (G2) VR to obtain the
faintly visible background of dot signal.
6. Push the TEST + JUMP (+ Channel) to cut off the signal. The screen
should be bright or dark. Brightness of raster must be increased
when adjusting.
7. Adjust screen VR until the screen is slightly cut off, or scarcely lights
up. A signal cannot be seen when the brightness of the raster is
high.
8. Push the JUMP again to release the cut off.
170 + 2.0 Vdc
GND
170Vdc
pedestal

2-5. WHITE BALANCE ADJUSTMENTS

1. Set program palette to STANDARD and push RESET.
2. Input an entire white signal.
3. Set to Service Adjustment Mode.
4. Set the PICTURE and BRIGHT to minimum.
5. Adjust with SBRT if necessary.
6. Set RCUT to "14".
7. Select GCUT and BCUT with 3 and 5 .
8. Adjust by pressing 1 and 4 for the best white balance.
9. Set the PICTURE and BRIGHT to maximum.
10. Select GDRV and BDRV with and .
11. Adjust with 3 and 6 for the best white balance.
12. Write into the memory by pressing 3 then 5 .
13. Repeat steps 1-12 for GDR4, BDR4, GCU4 and BCU4 using
Video 4 input.
* Use values from Sub Contrast Adjustments
White balance should be adjusted after Sub Contrast because
RDRV is also used in Sub Contrast Adjustment. (See page 22).
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KV-27FV300/29FV300/32FV300/36FV300