SCD-XE680 - Sony Audio Service Manual (repair manual). Page 17

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17

Checking Method:
Under the condition of RF level check mode in step 3, connect the
oscilloscope to the TP516 (RFCK) (CH1), TP517 (WFCK) (CH2),
and the TP808 (DG) (GND) on the MAIN board to check that the
value A of the waveform satisfies the specification.

 Take care not to leave the test disc in the set.

Disc

A

PATD-012 or

35 

µsec or less

YEDS-18

A

Checking Method:
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.

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.

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.

 Take care not to leave the test disc in the set.

Disc

A

SATD-S5 or

SATD-S4

PATD-012 or

0.9 to 1.4 Vp-p

YEDS-18

 Clear RF waveform refers to the waveform where 

◊ shapes should

be distinctively observed in the center.

A

l

L

l

L

l

L

l

L

A

Checking Method:
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.

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

A

B

l

L