Electrical Adjustments - Sony SCD-1/777ES Service Manual

Note on Adjustment
1. When the following parts were replaced, adjust and check the
items marked with a in the given order.
Parts
Adjustment & check
1. Optical Pick-up
Height Adjustment
2. Overall Adjustment
3. Traverse Check
4. S Curve Check
5. RF Level Check
6. CLV Jitter Check
2. Adjustment jigs
The following jigs are exclusively used for electrical adjust-
ment and check of this set. Do not use them for other applica-
tions.
(1) Disc
Model Type*1 Category
SATD-S1 SL 8cm disc
SATD-S2 SL Reference disc
SATD-S3 DL Reference disc
SATD-S4 SL Reference disc
TCD-784 CD Reference disc
*1 SL: Single Layer
DL: Dual Layer
(2) Remote commander: Assessory for set or RM-D950 (Part No.
1-473-944-1)
(3) Extension cable (Part No. J-2501-164-A) 2 pcs.
3. In making adjustment and check, set the CD1/CD2 switch on
the remote commander to CD1.
4. The impedance of oscilloscope should be more than 10M .
12

ELECTRICAL ADJUSTMENTS

Optical IC on RF or Spindle
pick-up MAIN board motor (M7)
×
a
a a
×
a
×
a
×
a
× ×
Applications
Optical pic-kup H adj.
Overall adj. and check
Overall adj. and check
Audio characteristic check
Overall adj. and check
SECTION 6
Traverse Check
Connection:
MAIN board
TP516 (TE)
TP501 (VC)
a
×
Procedure:
×
1. Connect an oscilloscope to the TP516(TE) and TP501(VC) on
×
the MAIN board.
×
2. Set the Adjustment-1 Mode. (See 5-2. Adjustment-1 Mode in
SECTION 5 (page 11))
a
3. Set a disc (SATD-S2, SATD-S3, or TCD-784).
4. Press the 3 button and - button on the remote commander
to make the disc type checked.
Note: If the disc check was made in the Adjustment-1 Mode, pressing
another button immediately after pressing the 3 and - buttons
on the remote commander could cause the microcomputer to run
out of control, thus requiring extreme care.
5. Confirm that the disc was checked.
Discchk
6. Press the H button.
7. Press the - button and 7 button, and the - button and 5
button on the remote commander successively to turn off the
tracking servo.
8. Check that the waveform on oscilloscope is within the level
A and B specifications.
9. After checking, press the
10. Repeat steps 3 through 9 respective discs.
11. Press the
!
Specified Value:
Disc
SATD-S2
SATD-S3
TCD-784
Traverse waveform
VC
Adjustment Location : See page16.
oscilloscope
(auto or normal mode)
+
–
bbb
CD1
XX XX
Disc type (refer to Disc check list (page 11))
x button.
button to turn the power off.
A
1.3 to 2.4 Vp-p
Center fo the waveform
A
B
- 0.1 to +0.1 V
B