Sony KDP-57XBR2 Service Manual page 212

2-5 SUB Y/C LEVEL
ADJUSTMENT (FOR VDO SIGNAL
PATH)
1. Select TWIN mode and display 100 %
color bars (480i, 0% setup, component)
signal through VIDEO 5 input in both
picture windows. (White to Black Level:
Y = 714 ± 10 mVp-p; PB, PR = 700 ±
10 mVp-p).
2. Press the remote's joystick button in to
cancel the TWIN mode.
3. Press the channel UP button on the
remote to display any cable or VHF/UHF
channel.
4. Alternately connect an oscilloscope to
CN005 pin A1 (V_ MIDI_Y), and pin A2
(V_ MIDI_ PB) on the B board. The TV
should be showing the TV picture,
but the oscilloscope should still be
showing the waveform from the
colors bars that are being input to
video-5.
5. Enter the service mode and select
category "2103- 2".
6. Adjust item #0 "YLEV" and item #1
"CLEV" so that the waveform levels are
1.400 ± 0.015 Vp-p.
7. After adjustment is finished, press the
"MUTING" + "ENTER " buttons on the
remote to write the data to memory.
A = 1.400 ± 0.015 Vp- p
Y
63.5 uS
PB
Fig. 2-5
2-6 MAIN DECODER SUB
CONTRAST ADJUSTMENT (FOR
COMPOSITE AND Y/C INPUTS)
1. Display 100 % color bars (480i, 7.5%
setup, Y/ C) signal through VIDEO 3
input. (White to Black Level Y : 714 ± 10
mVp-p, Burst Level C: 285 ± 10 mVp- p)
2. Connect an oscilloscope to CN005 pin
A5 (V_ DRCI_ Y) on the B board.
3. Enter the service mode and select
category "2103- 1".
4. Adjust item #2 "SCON" so that the
waveform level is 1.400 ± 0.035Vp-p.
5. After adjustment is finished, press the
"MUTING" + "ENTER" buttons on the
remote to write the data to memory.
Y
63.5 uS
Fig. 2-6
2-7 MAIN DECODER SUB COLOR
AND SUB HUE ADJUSTMENT
(FOR COMPOSITE AND Y/C
INPUTS)
1. Display 100 % color bars (480i, 7.5%
setup, Y/ C) signal through VIDEO 3
input. (White to Black Level Y: 714 ± 10
mVp-p; Burst Level C: 285 ± 10 mVp-p).
2. Connect an oscilloscope to CN005 pin
A6 (V_ DRCI_ PB) on the B board.
3. Enter the service mode and select
category "2103- 1".
4. Adjust item #3 "SCOL" and item #4
"SHUE" so that the waveform levels are
1.490 ± 0.040 Vp- p and 0.248 ± 0.035
Vp-p.
5. After adjustment is finished, press the
"MUTING" + "ENTER" buttons on the
remote to write the data to memory.
C2 - C1 = 0.248 ±0.035
↕
C2
↕
C1
PB
63.5 uS
9
1.400 ± 0.015 Vp-p
1.490 ± 0.04 Vp- p
Fig. 2-7