Read Sony SCD-XB790 Service Manual online
18
SCD-XB790
RF Level Check
Connection:
Checking Method:
1. Under the condition of traverse waveform check mode in step
1. Under the condition of traverse waveform check mode in step
4, press the
[ AMS ]
dial.
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.
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.
5. Press the
[ AMS ]
dial (for the SACD, “RF JITTER
(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.
“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.
7. Press the
[ AMS ]
dial, and “INSIDE TRACK” will be
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
[ AMS ]
dial, and the test is
over when “BU MEASURE” is displayed.
10. Press the
[OPEN/CLOSE ]
button to open the tray, and re-
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]
button to turn the
power off.
Note:
Take care not to leave the test disc in the set.
Specified Value:
Disc
A
SATD-S5 or
SATD-S4
PATD-012 or
0.9 to 1.4 Vp-p
YEDS-18
Note:
Clear RF waveform refers to the waveform where
◊ shapes should
be distinctively observed in the center.
Checking and Connecting Location : See page 19.
MAIN board
TP703 (RFAC)
TP704 (AGND)
+
–
–
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
RF signal waveform
A
l
L
l
L
l
L
l
L
A
Traverse Check
Connection:
Checking Method:
1. Under the condition of S curve waveform check mode in step
1. Under the condition of S curve waveform check mode in step
5, press the
[ AMS ]
dial.
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
B
SATD-S5 or
SATD-S4
PATD-012 or
0.9 to 1.4 Vp-p
–0.1 to +0.1V
YEDS-18
Checking and Connecting Location : See page 19.
MAIN board
TP513 (TE)
TP504 (AVC)
+
–
–
oscilloscope
A
B
VC
Center fo the waveform
Traverse waveform
l
L
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