Sony SCD-XB790 Service Manual page 18

SCD-XB790
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3 7 63 1515 0
Traverse Check
Connection:
MAIN board
TP513 (TE)
TP504 (AVC)
Checking Method:
1. Under the condition of S curve waveform check mode in step
[ AMS
5, press the l L
2. After "WAIT" is displayed, the traverse waveform check mode
will become active and "TRV MODE ON" will be displayed.
3. Connect an oscilloscope to the TP513 (TE) and TP504 (AVC)
on the MAIN board.
4. Check that the level A and B of waveform on the oscillo-
scope satisfy the specification.
Specified Value:
Disc
A
SATD-S5 or
SATD-S4
0.9 to 1.4 Vp-p
PATD-012 or
YEDS-18
Traverse waveform
TE
L 13942296513
VC
Checking and Connecting Location : See page 19.
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.
18
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oscilloscope
+
–
]
dial.
B
–0.1 to +0.1V
Center fo the waveform
A
B
x ao
y
i
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8
RF Level Check
Connection:
MAIN board
TP703 (RFAC)
TP704 (AGND)
Checking Method:
1. Under the condition of traverse waveform check mode in step
[ AMS
4, press the l
2. Connect an oscilloscope to the TP703 (RFAC) and TP704
(AGND) on the MAIN board.
3. After "WAIT" is displayed, the RF waveform check mode will
become active and "PLAY 5th TRACK" (for the SACD, "RF
MODE ON") will be displayed, and the 5th music on the disc
will be played.
4. Check that the RF waveform is clear and the level satisfies the
specification.
[ AMS
5. Press the l
(5th)" will be displayed, and further press the AMS dial), and
"OUTSIDE TRACK" will be displayed and the outward track
of the disc will be played.
6. Check that the RF waveform is clear and the level satisfies the
specification.
[ AMS
7. Press the l
displayed and the inward track of the disc will be played.
8. Check that the RF waveform is clear and the level satisfies the
specification.
9. After checking, press the
over when "BU MEASURE" is displayed.
Q Q
3 6 7 1 3
[OPEN/CLOSE ]
10. Press the
move the test disc.
11. Using each type of disc, repeat from step 1 of S curve wave-
form check up to step 10 of RF level check.
12. When the check is over, press the
power off.
Note: Take care not to leave the test disc in the set.
Specified Value:
Disc
SATD-S5 or
SATD-S4
0.9 to 1.4 Vp-p
PATD-012 or
YEDS-18
RF signal waveform
Note: Clear RF waveform refers to the waveform where ◊ shapes should
be distinctively observed in the center.
Checking and Connecting Location : See page 19.
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.
2 9 9 4 2 8
oscilloscope
+
–
]
L dial.
]
L dial (for the SACD, "RF JITTER
]
L dial, and "INSIDE TRACK" will be
[ AMS ]
l L dial, and the test is
1 5 0 5 8 2 9 9 4
button to open the tray, and re-
A
[POWER]
button to turn the
A
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
A
m
co
9 9
2 8 9 9