Sony DPP-MS300 Service Manual page 24

[D/A Output CHROMA Level Adjustment] (DK-40 board)
Mode VIDEO Input
Signal Color bar (VIDEO IN)
Measuring point J1802 (OUTPUT)
Measuring equipment Oscilloscope
Adjustment part RV402
Specification value 672 ± 15 mVp-p
Adjustment Procedure:
(1) Adjust RV402 so that the A level (Red) of waveform on the
oscilloscope satisfies the specification value.
(2) Turn off the power switch.
H
Fig. 4-8
[A/D Input Y Level Adjustment] (DK-40 board)
Note: Turn off the power switch once, then turn it on again.
Mode VIDEO Input
Signal Color bar (S-VIDEO IN)
Measuring point CL409
Measuring equipment Oscilloscope
Adjustment part RV404
Specification value 1.05 ± 0.03 Vp-p
Adjustment Procedure:
(1) Connect on oscilloscope to the CL409 (from IC407 ^¢ pin
to the point via R478).
(2) Adjust RV404 so that the A level (white) of waveform on
the oscilloscope satisfies the specification value.
White (75%)
Fig. 4-9
Red
A
A
H
[A/D Input R-Y/B-Y Level Adjustment]
(VI-40, DK-40 board)
Mode
Signal
Measuring point
Measuring equipment
Adjustment parts
Specification value
Adjustment Procedure:
(1) Connect on oscilloscope to the CL408.
(2) Adjust RV105 so that waveform to be Fig. 4-10.
Yellow
(3) Adjust RV106 so that the A level (B-Y) of waveform on the
oscilloscope satisfies the specification value.
Yellow
(4) Connect on oscilloscope to the CL407.
(5) Adjust RV405 so that the A level (R-Y) of waveform on the
oscilloscope satisfies the specification value.
Yellow
4-5
VIDEO Input
Color bar (S-VIDEO IN)
CL407, 408
Oscilloscope
RV105, 106, 405
CL407 (R-Y) 1.03 ± 0.02 Vp-p
CL408 (B-Y) 1.30 ± 0.02 Vp-p
C B A
C 1/4A
B 2/3A
Fig. 4-10
Blue
A
Fig. 4-11
Red
A
Fig. 4-12