Sony SCD-1/777ES Service Manual page 14

CLV Jitter Check
Connection:
MAIN board
TP702 (MNT4)
TP703 (MNT5)
TP521 (GND)
Procedure:
1. Connect an oscilloscope to the TP702(MNT4)(CH1),
TP703(MNT5)(CH2) and TP521(GND) on the MAIN board.
2. Set the Adjustment-2 Mode. (See 5-3. Adjustment-2 Mode in
SECTION 5 (page 11))
3. Set a disc (SATD-S2 or TCD-784).
4. Press the button.
H
5. Move the sled to the middle track.
• Sled middle track
SATD-S2:TN05
TCD-784:TN05
6. Check that the A value of waveform on oscilloscope satisfies
the specification.
7. After checking, press the
8. Repeat steps 3 through 7 for respective discs.
9. Press the button to turn the power off.
!
Specified Value:
Disc
A
SATD-S2
55 µsec or less
TCD-784
CLV jitter waveform
Adjustment Location : See page16.
14
oscilloscope
(normal mode)
(CH2)
+ +
–
(CH1)
x button.
A
Optical Pick-up Height Adjustment
Connection:
MAIN board
TP515 (PI)
TP511 (FOUT)
TP501 (VC)
Procedure:
1. Connect an oscilloscope to the TP515(PI)(CH1),
TP511(FOUT) (CH2) and TP501(VC) on the MAIN board.
2. Set the Adjustment-1 Mode. (See 5-2. Adjustment-1 Mode in
SECTION 5 (page 11))
3. Set a disc (SATD-S1).
4. Press the [FILTER] button to set the Focus Search mode.
5. Loosen the OP height adjusting screw 1, and while shifting
the Holder (R2), adjust the height so that the waveform on
oscilloscope satisfies the specified value.
6. Press the [FILTER] button to set the Play mode.
7. Adjust the TAN skew 2 so as to attain most preferable jitter
value on the display.
8. Press the [FILTER] button to set the Focus Search mode.
9. Check that the B value of waveform on oscilloscope satisfies
the specification.
10. Repeat steps 5 through 9.
11. Lock the OP height adjusting screw 1 when adjustment fin-
ished.
12. Press the button.
x
13. Press the ! button to turn the power off.
Specified Value: B is more than 0, and less than A/3
VC
A
VC
*1: Normal-trigger the oscilloscope using FOUT on CH2.
Adjustment Location : See page16.
storage
oscilloscope
(normal mode)
(CH1)
+ +
–
(CH2)
B
PI
FOUT
2
TAN skew
1
OP height
adjusting screw
Holder (R2)
*1