Picture Adjustments; Defocus Adjustment - Sony KDP-57XBR2 Service Manual

10. Lock the focus controls with locking
paint (if no other mechanical
adjustments are being made).
Note: If lens caps are unavailable, you
can cut off the unnecessary colors in the
service mode by individually changing
the data in adjustment category "2150P-
2" , item # 1"RGBS". To display blue
only, change the data to "1", to display
green only, change the data to "2", to
display red only, change the data to "4".
All colors are displayed when the data is
set to "7".

1-7 DEFOCUS ADJUSTMENT

(BLUE CRT ONLY)
1. Select display mode to WIDE ZOOM
and picture mode PRO, and while in the
adjustment menu press RESET on the
remote to restore the PRO mode factory
defaults.
2. Display a dot pattern.
3. Adjust the blue focus control on the
focus block to make the blue dot slightly
larger than red and green dots. This
adjustment provides a more pleasing
picture to the customer.
4. Confirm that the flare surrounding the
blue dot is minimal. "Flare" is a
fuzziness that surrounds an otherwise
focused dot. It may even be a different
color than the color of the CRT that is
producing it. For example, if you cover
the red and blue lenses and display a
green cross-hatch or dot pattern, the
flare surrounding the green lines or dots
may be blue due to the prism effect of
the green CRT lens.
Excessive flare: no
good.
Lock the focus controls with locking paint (if no
other mechanical adjustments are being made).
This completes the setup adjustments.
Minimum flare: OK
7

2- PICTURE ADJUSTMENTS

2-1 480p Y, PB, PR GAIN
ADJUSTMENT
1. Display 100 % color bars (480p, 0%
setup, component) signal through
VIDEO 5 input. (White to Black Level :
700 ± 10 mVp- p)
2. Alternately connect an oscilloscope to
CN005 pin A1 (V_ MIDI_ Y) and pin A2
(V_ MIDI_ PB), and pin A3 (V_ MIDI_
PR) on the B board.
3. Enter the service mode and select
category "CXA2151".
4. Adjust item #5 "YGN" , item #3 "CBGN",
and item # 4 "CRGN" so that the
waveform level is 1.400 ± 0.035 Vp-p.
After adjustment is finished, press the "MUTING"
+ "ENTER" buttons on the remote to write the
data to memory.
A = 1.400 ± 0.035 Vp-p
Y
Y
31.78 uS
PB
PR
2-2 MAIN Y/C LEVEL
ADJUSTMENT (FOR DRC SIGNAL
PATH)
1. Display 100 % color bars (480i, 0%
setup, component) signal through
VIDEO 5 input. (White to Black Level Y :
714 ± 10 mVp- p, PB, PR : 700 ± 10
mVp- p)
2. Alternately connect an oscilloscope to
CN005 pin A5 (V_ DRCI_ Y), and pin
A6 (V_ DRCI_ PB) on the B board.
3. Enter the service mode and select
category "2103- 1".
4. Adjust item #0 "YLEV" and item #1
"CLEV" so that the waveform levels are
Fig. 2-1