Sony Scd-1 Service Manual

							11
5-2. ADJUSTMENT-1 MODE
This mode is a special mode used to perform overall adjustment,
optical pick-up height adjustment, and service check.
Note:
1. Wrong setting method can cause a trouble.
2. Never operate the set with the loading panel mounted, which otherwise
causes a trouble.
Setting Method:
1. With the power turned off, press the  
!  button while pressing
the [DIGITAL OUT] button and 
l button.
2. Display of ÒbbbÓ implies that the set is now in the Adjust-
ment-1 Mode.
Resetting Method:
Press the  
!  button to turn the power off, and disconnect the plug
from the socket.
5-3. ADJUSTMENT-2 MODE
This mode is a special mode used to perform CLV jitter check and
usually movement check.
Note:
1. Wrong setting method can cause a trouble.
2. Never operate the set with the loading panel mounted, which otherwise
causes a trouble.
Setting Method:
1. With the power turned off, press the  
!  button while pressing
the [TIME] button and 
H button.
2. Display of Ò# OPEN #Ó implies that the set is now in the Ad-
justment-2 Mode.
Resetting Method:
Press the  
!  button to turn the power off, and disconnect the plug
from the socket.
Adjustment item
*1: Disc check listDisplay Result of Disc Check
Discchk DO SL No disc
Discchk D1 SL SL
Discchk D2 CD CD
Discchk D3 CD Hybrid CD layer
Discchk D3 HD Hybrid HD layer
Discchk D4 D0 DL L0 layer
Discchk D4 D1 DL L1 layer
Codes Contents Remarks Disc
01 LD ON/OFF CD, SL, DL
02 Spindle ON/OFF CD, SL, DL
03 Forcus Search CD, SL, DL
04 Forcus Servo ON/OFF CD, SL, DL
05 Track Servo ON/OFF CD, SL, DL
06 CLV ON CD, SL, DL
07 Sled Servo ON/OFF CD, SL, DL
22 Tilt Servo ON/OFF CD, SL, DL
23 Tilt Bias Up CD, SL, DL
24 Tilt Bias Down CD, SL, DL
30 Disc Check CD, SL, DL
5: Thresholds
check              
Go
60 Overall Adjustment 9: No thresholds CD, SL, DL
check
0: Cancel
61 Result Display1: Proceed
2: ReturnCD, SL, DL
62 Adj. Value  Clear9: Go
0: CancelCD, SL, DL
PLAY PLAY CD, SL, DL
PAUSE PAUSE CD, SL, DL
STOP STOP CD, SL, DL
NEXT NEXT CD, SL, DL
PREV PREV CD, SL, DL
SACD select
FILTER Focus Search/PLAY(SACD/CD key)SL
CD select
(SACD/CD key)CD
Note:
1. Selection of an adjustment item where no disc is present could damage
the optical pick-up.
2. Do not use other than above listed codes.
*1
Adjustment-1 Mode ListNote: Set the CD1/CD2 switch on the remote commander to CD1.
Traverse check, S curve check,
Adjustment-1RF level check, optical pick-up
Modeheight adjustment, and see contents of
Adjustment-1 Mode list.
Adjustment-2CLV jitter check and usually
Modemovemant check 
						

							12
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 
x button.
10. Repeat steps 3 through 9 respective discs.
11. Press the 
! button to turn the power off.
Specified Value:
DiscA
B
SATD-S2
SATD-S3 1.3 to 2.4 Vp-p - 0.1 to +0.1 V
TCD-784
bbb              CD1
             Discchk XX XX
Disc type (refer to Disc check list (page 11))
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))
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.
SECTION  6
ELECTRICAL  ADJUSTMENTS
Note on Adjustment
1. When the following parts were replaced, adjust and check the
items marked with a in the given order.
Optical IC on RF or Spindle
Adjustment & check pick-up MAIN board motor (M7)
1. Optical Pick-up
    Height Adjustmenta´a
2. Overall Adjustmentaa´
3. Traverse Checka´´
4. S Curve Checka´´
5. RF Level Checka´´
6. CLV Jitter Check´´a
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 Applications
SATD-S1 SL 8cm disc Optical pic-kup H adj.
SATD-S2 SL Reference disc Overall adj. and check
SATD-S3 DL Reference disc Overall adj. and check
SATD-S4 SL Reference disc Audio characteristic check
TCD-784 CD Reference disc Overall adj. and check
*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 .Traverse Check
Connection:
MAIN board
TP516 (TE)
TP501 (VC)+
– oscilloscope
(auto or normal mode)
A
B
VCCenter fo the waveform Traverse waveform
Par ts
Adjustment Location : See page16. 
						

							13
6. Press the H button.
7. Check that the waveform on oscilloscope is clear, and the level
and jitter of waveform satisfy the specifications.
8. After checking, press the 
x button.
9. Repeat steps 3 through 8 for respective discs.
10. Press the 
! button to turn the power off.
Specified Value:
DiscAJitter (displayed value)
SATD-S2 1.25 to 1.65 Vp-p 20 (Hex) or less
TCD-784 1.3 to 1.7 Vp-p 15 (Hex) or less
bbb              CD1
             Discchk XX XX
Disc type (refer to Disc check list (page 11))
6. Press the - button and 1 button, the - button and 2 but-
ton, and the - button and 3 button on the remote commander
successively to execute the focus search.
7. Check that the waveform on oscilloscope is within the level
A and B specifications.
8. After checking, press the  
x  button.
9. Repeat steps 3 through 8 for respective discs.
10. Press the ! button to turn the power off.
Specified Value:
Disc
AB
SATD-S2
1.5 to 2.3Vp-p - 0.1 to +0.1V
TCD-784
S Curve Check
Connection:RF Level Check
Connection:
MAIN board
TP524 (FE)
TP501 (VC)+
– oscilloscope
(normal mode
)
Procedure:
1. Connect an oscilloscope to the TP524(FE) 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-S2 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.
A
B
S curve waveform
VC
MAIN board
TP503 (RF)
TP501 (VC)+
– oscilloscope
(auto mode)
Procedure:
1. Connect an oscilloscope to the TP503(RF) 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-S2 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.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns RF signal waveform
A
bbb              CD1+ 00 00 ~00 09
Jitter value
(HEX)
not fixed
Adjustment Location : See page16.
Adjustment Location : See page16.
bbb              CD1
             Discchk XX XX
Disc type (refer to Disc check list (page 11))
Note: For easier observation of this waveform, extend the sweep time
and raise the brightness.Note: Clear RF waveform refers to the waveform where à shapes should
be distinctively observed in the center.
Display example: 
						

							14
Optical Pick-up Height Adjustment
Connection:
MAIN board
TP702 (MNT4)
TP703 (MNT5)
TP521 (GND)+
+
– oscilloscope
(normal mode
)
(CH1) (CH2)
CLV Jitter Check
Connection:
A
CLV jitter waveform
MAIN board
TP515 (PI)
TP511 (FOUT)
TP501 (VC)+
+
– storage
oscilloscope
(normal mode)
(CH2) (CH1)
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 
x button.
13. Press the 
! button to turn the power off.
Specified Value: B is more than 0, and less than A/3
AB
VC
VCPI
FOUT
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 
H button.
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 
x button.
8. Repeat steps 3 through 7 for respective discs.
9. Press the 
! button to turn the power off.
Specified Value:
DiscA
SATD-S2
55 µsec or less
TCD-784
*1
*1: Normal-trigger the oscilloscope using FOUT on CH2.
2TAN skew
1OP height
adjusting screw
Holder (R2)
Adjustment Location : See page16.
Adjustment Location : See page16. 
						

							15
Overall Adjustment
Procedure:
1. Set the Adjustment-1 Mode. (See 5-2. Adjustment-1 Mode in
SECTION 5 (page 11))
2. Press the 6 button and 2 button, then the 9 button on the
remote commander (to initialize data).
3. Set a disc (TCD-784).
4. Press the 6 button and - button, then the 5 button on the
remote commander. (Adjustment will take about 2 minutes.)
5. Remove the disc when CD END is displayed.
6. Set a disc (SATD-S2).
7. Press the 6 button and - button, then the 5 button on the
remote commander. (Adjustment will take about 1 minute 30
seconds.)
8. Remove the disc when SL END is displayed.
9. Set a disc (SATD-S3).
10. Press the 6 button and - button, then the 5 button on the
remote commander. (Adjustment will take about 1 minute.)
11. Remove the disc when DL END is displayed.
Note: If an error is displayed during the adjustment so far, press again the
6 button and - button on the remote commander to execute re-
adjustment.
12. Press the 6 button and 1 button on the remote commander.
13. As the number and adjusted value are displayed, make sure
that it is within the threshold.
14. Press the 1 button on the remote commander to proceed to
the next item. (To return to the previous item, press the 2
button.)
15. Repeat steps 13 and 14.
16. After checking items up to No.43, press the 
! button to turn
the power off.Thresholds for Overall Adjustment
No. Description U limit L limit
00 PI Level SL 0 4
01 PI Level DL 3 7
02 PI Offset CD 15D 2A3
03 PI Offset SL 15D 2A3
04 PI Offset DL 15D 2A3
05 PI Offset Disc Check 100 2FF
06 Traverse Offset CD
07 Traverse Offset SL
08 Traverse Offset DL
09 Traverse Gain CD
10 Traverse Gain SL
11 Traverse Gain DL
12 For PI Level Disc Check 0 2
13 PI Reflectance SL 2D28 7333
14 PI Reflectance DL 936 4083
15 Surface Reflect to CD Layer Distance 82
16 Surface Reflect to DSD Layer Distance 41 82
17 Low Push-pull for Disc Check 4FDF 9999
18 High T Bal for Disc Check 0000 47AE
19 FE Offset CD
20 FE Offset SL
21 FE Offset DL
22 Focus Bias CD E0 20
23 Focus Bias SL E0 20
24 Focus Bias DL0 E0 20
25 AGC Focus Gain CD 1500 3000
26 AGC Focus Gain DL 0851 1A00
27 AGC Focus Gain SL 0C28 2500
28 AGC Tracking Gain CD 1A00 3C00
29 AGC Tracking Gain SL 1100 2500
30 AGC Tracking Gain DL 1400 2700
31 RF Loop Filter Offset CD F6 0A
32 RF Loop Filter Offset DSD F6 0A
33 Tilt Disordered Point CD +side
34 Tilt Disordered Point CD -side
35 Tilt Disordered Point SL +side
36 Tilt Disordered Point SL -side
37 Tilt Disordered Point DL +side
38 Tilt Disordered Point DL -side/
39 Tilt Offset CD F0 10
40 Tilt Offset SL F0 10
41 Tilt Offset DL F0 10
42 Focus Balance SL
43 Focus Balance DL
Note:1. No threshold specified for      items.
2. All thresholds are displayed in Hex. 
						

							16
Adjustment Location:
Ð MAIN Board (Component Side) Ð
TP511
(FOUT)TP515
(PI) TP524
(FE)TP501
(VC)
TP516
(TE)TP521
(GND)TP503
(RF)
TP703
(MNT5)
TP702
(MNT4) 
						

							17 17
SECTION  7
DIAGRAMS
7-1. NOTES FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM
Note:
The components identi-
fied by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specified.Note:
Les composants identifiŽs par
une marque 0 sont critiques
pour la sŽcuritŽ.
Ne les remplacer que par une

spŽcifiŽ. Note on Schematic Diagram:
¥ All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
¥ All resistors are in W and 
1/4
 W or less unless otherwise
specified.
¥ % : indicates tolerance.
¥
f: internal component.
¥5: fusible resistor.
¥C: panel designation.
¥U: B+ Line.
¥V: BÐ Line.
¥ Voltages and waveforms are dc with respect to ground in
adjustment mode.
no mark :STOP
( ) :SACD
áá ññ:CD
¥ Voltages are taken with a VOM (Input impedance 10 MW).
Voltage variations may be noted due to normal produc-
tion tolerances.
¥ Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
¥ Circled numbers refer to waveforms.
¥ Signal path.
J: SACD
c: CD
I: DIGITAL OUT Note on Printed Wiring Board:
¥X: parts extracted from the component side.
¥Y: parts extracted from the conductor side.
¥
a: Through hole.
¥b: Pattern from the side which enables seeing.
(The other layers patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts  on the parts face side seen from
(Component Side) the parts face are indicated.
¥ Indication of transistor
C
BThese are omitted.
E Q
¥ Circuit Boards Location
SW-L boardMAIN boardSTB boardPOWER boardAC boardCOAX board
OPT board
SW board
BAL board (SCD-1
)
PIN board
LOAD-SW board
LOAD-MOT board 
AUDIO board
LOAD-CN board SW-R board DISPLAY board
SLD-MOT board
RF boardSLD-FG boar
d 
						

							18 18
SCD-1/777ES
7-2. PRINTED  WIRING  BOARDS  Ð RF/SLD-FG/SLD-MOT Boards Ð ¥ See page 17 for Circuit Boards Location.
IC001 E-2
IC002 C-4
IC003 A-3
IC004 A-2
IC005 C-3
IC006 C-3
IC007 C-2Ref. No. Location Ref. No. Location
¥ Semiconductor Location
ÐRF BoardÐ
Ref. No. Location
IC010 A-2
IC011 C-2
IC012 A-1
Q001 F-3
Q002 B-5
Q003 B-4Q004 B-4
Q006 A-3
Q007 D-5
Q008 B-5
Q009 B-5
(Page 22)
(Page 22) 
						

							19 19
SCD-1/777ES
7-3. SCHEMATIC  DIAGRAM  Ð RF/SLD-FG/SLD-MOT Boards Ð ¥ See page 40 for Waveforms.
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.Les composants identifiŽs par une marque 0 sont
critiques pour la sŽcuritŽ. Ne les remplacer que

(Page
29)
(Page
28) 
						

							20 20
SCD-1/777ES
7-4. PRINTED  WIRING  BOARDS  Ð LOAD-CN/LOAD-MOT/LOAD-SW/STB Boards Ð ¥ See page 17 for Circuit Boards Location.
(Page 22)