Video Section - Sony HCD-ZX70DVD Service Manual

VIDEO SECTION

Note: During diagnostic check, the characters and color bars can be seen
only with the NTSC monitor. Therefore, for diagnostic check, use
the monitor that supports both NTSC and PAL modes
Instruments required:
1) Color monitor TV
2) Oscilloscope 1 or 2 phenomena, band width over 100 MHz,
with delay mode
3) Frequency counter (over 8 digits)
4) Digital voltmeter
5) Remote commander
RM-SD170 (1-418-911-11)
6) DVD reference disc
HLX-501 (J-6090-071-A) (dual layer)
HLX-503 (J-6090-069-A) (single layer)
HLX-504 (J-6090-088-A) (single layer)
HLX-505 (J-6090-089-A) (dual layer)
7) SACD reference disc
HLXA-509 (J-6090-090-A)
Video Level Adjustment
<Purpose>
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
Mode Video level adjustment in test mode
Signal Color bars
VIDEO OUT jack
Test point
(75 Ω terminated)
Instrument Oscilloscope
Adjusting element RV401 (MB board)
Specification 1.0 ± 0.02 Vp-p
Procedure:
1. Select the initial menu "6. Video Level Adjustment" in the test
mode so that color bars are generated. (Refer to "4-9. VIDEO
LEVEL ADJUSTMENT" on page 16)
2. Adjust the RV401 to attain 1.0 ± 0.02 Vp-p.
Figure 5-1
S-terminal Output Check
<Purpose>
Check S-terminal video output. If it is incorrect, pictures will not
be displayed correctly in spite of connection to the TV with a S-
terminal cable.
Mode Video level adjustment in test mode
Signal Color bars
S VIDEO OUT jack
Test point
(75 Ω terminated)
Instrument Oscilloscope
Specification 1.0 ± 0.1 Vp-p
20
Procedure:
1. Select the initial menu "6. Video Level Adjustment" in the test
mode so that color bars are generated. (Refer to "4-9. VIDEO
LEVEL ADJUSTMENT" on page 16)
2. Confirm that the S-Y level is 1.0 ± 0.1 Vp-p.
Checking S Video Output S-C
<Purpose>
This checks whether the S-C satisfies the NTSC Standard. If it is
not correct, the colors will be too dark or light.
Mode
Signal
Test point
Instrument
Specification
Connection:
Procedure:
1. Select the initial menu "6. Video Level Adjustment" in the test
mode so that color bars are generated. (Refer to "4-9. VIDEO
LEVEL ADJUSTMENT" on page 16)
2. Confirm that the S-C burst is 286 ± 50 mVp-p.
1.0 ± 0.02 Vp-p
Adjustment Location :
– MB BOARD (Side A) –
Figure 5-2
Video level adjustment in test mode
Color bars
CN005 pin 5
Oscilloscope
286 ± 50 mVp-p
CN005
100 µ F
+
5
75 Ω
100 k
± 1% ± 1%
4
Figure 5-3
1.0 ± 0.1 Vp-p
Oscilloscope
286 ± 50 mVp-p
RV401
VIDEO LEVEL
2
1
4
5
CN005