Sony SCD-XB790 Service Manual ▷ View online
17
SCD-XB790
4-4. SACD (DL) DISC OPERATION CHECK
(• Perform as necessary)
This checking performs the focus jump using a DL disc, which is
a dual-layer HD disc, to verify the stability of the set.
A set of layer 0 most-outside track access (only once)
This checking performs the focus jump using a DL disc, which is
a dual-layer HD disc, to verify the stability of the set.
A set of layer 0 most-outside track access (only once)
tone-second
trace
tfocus jump (layer 0t1)tone-second tracetfocus jump
(layer 1
t0) are repeated 5 times.
Checking Method:
1. After setting the test mode, rotate the
1. After setting the test mode, rotate the
[ AMS ]
dial to
select “91 FJUMP CHECK” and press the
[ AMS ]
dial
to enter.
2. The tray will open automatically, and then set the DL disc.
3. With “DISC IN&JOG ON” displayed, press the
3. With “DISC IN&JOG ON” displayed, press the
[ AMS ]
dial.
4. The tray will be loaded in automatically, and then the test will
start.
5. During the test, “NOW TEST
iiii” is displayed.
6. Upon successful completion of the check, “OK!” will be
displayed and the tray will open automatically. (In case of
NG, “NG! ERR FJ-UP” or “NG! ERR FJ-DWN” is displayed)
NG, “NG! ERR FJ-UP” or “NG! ERR FJ-DWN” is displayed)
7. Take the DL disc out and press the
[OPEN/CLOSE ]
button,
and the test mode selection display will be back
4-5. SHIPPING MODE
The repaired set must be initialized, and for this purpose the set
should be set to the shipping mode.
should be set to the shipping mode.
Setting Method:
1. After setting the test mode, rotate the
1. After setting the test mode, rotate the
[ AMS ]
dial to
select “8D SETUP MODE” and press the
[ AMS ]
dial
to enter.
2. “INITIAL OK” is displayed and the test mode selection display
will be back immediately.
“8D 000000000 00” will be displayed, and if the scroll starts in
the left direction, the set initialization has completed
3. Press the
[POWER]
button to turn the power off.
The following setups are established in the shipping mode
1. Initialization of EEPROM (IC903)
1. Initialization of EEPROM (IC903)
• PLAY MODE
CONTINUE
• LAYER SELECT
SACD
• M/2CH SELECT
MULTI
• 2ch SPK MODE
2ch DIRECT
• Mch SPK MODE
Mch DIRECT
• Resetting the cumulative light emission time of the laser
Note
: Even if the shipment mode setting mentioned above is made, the
disc check threshold value attained in the 3. SET CHECK is not
cleared.
cleared.
2. The optical pick-up moves to the home position (most-inside
track)
Error List
Display
Description
Toc Error *
Error during the time from auto adjustment to TOC
reading, Different type of disc (Such as a DVD disc),
Disc is dirty
reading, Different type of disc (Such as a DVD disc),
Disc is dirty
Toc Error **** Illegal SACD (Such as a pirated version)
4-6. WAVEFORMS CHECK
BU Electrical Adjustment Mode
BU Electrical Adjustment Mode
The BU electrical adjustment mode is used to check the S curve
waveform, traverse waveform, RF waveform, and CLV jitter. After
a disc is placed on the tray, each time the
waveform, traverse waveform, RF waveform, and CLV jitter. After
a disc is placed on the tray, each time the
[ AMS ]
dial is
pressed, the check mode is switched in order for S curve
waveform
waveform
t traverse waveformtRF waveformtCLV jitter (for
the CD).
S Curve Check
Connection:
Checking Method:
1. After setting the test mode, rotate the
1. After setting the test mode, rotate the
[ AMS ]
dial to
select “9C. BU DENCHO” and press the
[OPEN/CLOSE ]
button. Place the test disc (PATD-012 or YEDS-18 or SATD-
S5 or SATD-S4) on the tray and close the tray, then press
the
S5 or SATD-S4) on the tray and close the tray, then press
the
[ AMS ]
dial.
2. At the completion of disc type check, “CD DETECT” will be
displayed (for PATD-012 or YEDS-18).
Note:
For the SATD-S5 or SATD-S4, “SL DETECT” is displayed.
3. Press again the
[ AMS ]
dial, and the S curve waveform
check mode will become active and “S-CURVE MODE” will
be displayed.
be displayed.
4. Connect an oscilloscope to the TP506 (FE) and TP504 (AVC)
on the MAIN board.
5. Check that the level A and B of waveform on the oscilloscope
satisfy the specification.
Specified Value:
Disc
A
B
SATD-S5 or
SATD-S4
PATD-012 or
0.7 to 1.7 Vp-p
–0.1 to +0.1V
YEDS-18
Note:
For easier observation of this waveform, extend the sweep time
and raise the brightness.
and raise the brightness.
Checking and Connecting Location : See page 19.
MAIN board
TP506 (FE)
TP504 (AVC)
+
–
–
oscilloscope
A
B
S curve waveform
VC
l
L
l
L
l
L
l
L
l
L
l
L
A
A
l
L
l
L
l
L
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
SCD-XB790
19
19
– MAIN Board (Component Side) –
TP506
(FE)
TP513
(TE)
TP504
(AVC)
TP704
(AGND) TP703
(RFAC)
TP514
(RFCK)
TP517
(WFCK)
TP808 (DG)
IC703
IC701
IC509
IC801
CLV Jitter Check (CD only)
Connection:
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.
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.
Note:
Take care not to leave the test disc in the set.
Specified Value:
Disc
A
PATD-012 or
35
µ
sec or less
YEDS-18
Checking and Connecting Location:
A
CLV jitter waveform
MAIN board
TP516 (RFCK)
TP517(WFCK)
TP808 (DG)
+
+
–
oscilloscope
(CH2)
(CH1)
SCD-XB790
20
20
SECTION 5
DIAGRAMS
5-1.
BLOCK DIAGRAM – RF/SERVO Section –
MUTE LOAD
DETECTOR
1
63
3
4
5
6
9
10
11
12
14
15
16
13
18
17
61
62
53
52
54
55
59
60
DVDRFP
RFSIN
A2
B2
C2
D2
CD E
CD F
A
B
C
D
A
B
C
D
A
B
C
C
D
A
B
C
D
CD A
CD B
CD C
CD C
CD D
DVDLD
CDPD
CDLD
DVDPD
DVDPDSW
MUX
ATT
ATON
ATOP
FNP
FNN
INPUT
BIAS,
AGC
PROGRAMMABLE
EQ FILTER
DIFFERENTIATOR
AIP
AIN
DIP
DIN
SUMMING AMP
IC004 (1/4)
SUMMING AMP
IC004 (2/4)
GCA
MUX
DUAL
APC
GCA,
EQ
GCA
L. P. F.
+
–
–
PHASE
DETECTOR
COMPARATOR
MUX
+
–
–
+
–
–
+
+
+
+
+
+
+
+
+
+
–
–
CLAMP&
ENVELOPE
LEVEL DAC
GCA
SUB
GCA
SEL
L. P. F.
OFFSET
CANCEL
MUX
BOTTOM
ENVELOPE
INPUT
BUFFER
PEAK/
BOTTOM
HOLD
SERIAL
PORT
REGISTER
57
27
31
32
39
47
46
48
FULL WAVE
RECTIFER
AGC
CHARGE PUMP
AVC BUFFER
IC004 (4/4)
AVC
(+1.65V)
A+3.3V
WAVRB BUFFER
IC503 (1/2)
WAVRB
D+5V
VC
(+2.5V)
VC
AGCO
SACD/CD RF AMP,
FOCUS/TRACKING ERROR AMP
IC001
OPTICAL PICK-UP
BLOCK
(KHM-234AMA)
MODULE
CIRCUIT
2AXIS
DEVICE
FOCUS/
FOCUS/
TRACKING
COIL
21
22
23
12
5
11
6
9
AUTOMATIC POWER
CONTROL (FOR CD)
Q003
AUTOMATIC POWER
CONTROL (FOR SACD)
Q001
FOCUS COIL
DRIVE
14
2
13
3
TRACKING COIL
DRIVE
17
24
18
23
33
34
20
22
21
19
8
40 41 39 43
31
32
29
30
20
SLED MOTOR
DRIVE
FOCUS/TRACKING COIL DRIVE,
SLED MOTOR DRIVE
IC502
M
M2
(SLED)
8
9
SPINDLE MOTOR
DRIVE
M
M
M3
(SPINDLE)
6
5
LOADING MOTOR
DRIVE
M
M
M151
(LOADING)
16
17
13
FOCUS/TRACKING/SLED
PWM GENERATOR
FFDR
FRDR
TFDR
TRDR
SFDR
SRDR
SERVO
INTERFACE
SERVO AUTO
SEQUENCER
A/D
CONVERTER
FOCUS
TRACKING/SLED
SERVO DSP
DFCT, FOK
DETECTOR
26
SE
TE
FE
RFDC
TE
FE
PI
26
DIGITAL SERVO
PROCESSOR
IC509 (1/2)
TO CPU INTERFACE
D+3.3V
S1
(LIMIT)
MIRR
FOK
DFCT
COUT
SCLK
SSTP
STBY1
STBY2
RF
A
B
C
D
E
F
G
H
DVD LD
CD LD
DVD/CD PD
DVD VR
FCS+
FCS–
TRK+
TRK–
D
C
B
A
AGCO
RFAC
MIRR
MIN
MEVO
PI
FE
TE
TE
SDATA
SCLK
SDEN
LDON
LOAD OUT
LOAD IN
MUTE 2D
SPDA
F JMP1
F JMP2
• SIGNAL PATH
: SACD PLAY
: CD PLAY
2
RFAC
(Page 21)
3
TE, FE, PI
(Page 22)
4
SDATA, SCLK, SDEN
(Page 22)
5
LDON
(Page 21)
DVDPDSW, CDPDSW
(Page 22)
10
SPDA, F JMP1/2
(Page 21)
11
SPIN
(Page 21)
12
MUTE 2D, SP ON, MUTE LOAD
(Page 22)
13
LOAD IN/OUT
(Page 22)
8
FOK, MIRR,
COUT, SCLK
(Page 22)
TRKSW
(Page 22)
DRVC BUFFER
IC503 (2/2)
DRVC
(+2.5V)
D+5V
SPINDLE MOTOR
DRIVE
42
MNTR
FE
PI
PI
FE
TE
SDATA
SCLK
SDEN
MIRR
FOK
COUT
SCLK
9
(Page 22)
LIM SW
BUFFER
BUFFER
2
SP ON
MUTE2
MUTE1
SPINDLE/LOADING MOTOR DRIVE
IC512
21
22
24
15
23
L. P. F.
GCA
OFFSET
CANCEL
40
L. P. F.
OFFSET
CANCEL
38
PI ERROR AMP
IC004 (3/4)
24
PHOTO DIODE
CONTROL SWITCH
(FOR SACD)
Q005
CD VR
PHOTO DIODE
CONTROL SWITCH
(FOR CD)
Q004
TRACKING COIL DRIVE
CONTROL SWITCH
IC501
1
2
4
1
2
CDPDSW
7
6
TRACKING COIL DRIVE
CONTROL SWITCH
IC505
27
26
1
(Page 21)
SP ERR
25
4
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