Sony SCD-XB780 Service Manual ▷ View online
3
SCD-XB780
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
CLEANING OF OPTICAL PICK-UP LENS
In cleaning the lens of optical pick-up, use the air blower.
Never use a cotton swab for cleaning the lens of optical pick-up,
which otherwise causes a trouble.
Never use a cotton swab for cleaning the lens of optical pick-up,
which otherwise causes a trouble.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
BLOCK OR BASE UNIT
HOW TO OPEN THE TRAY WHEN POWER SWITCH TURNS OFF
tray
tapering driver
cam (66)
1
Insert a tapering driver (3 mm in diameter)
in the hole at the bottom of the unit,
turn the cam (66) fully in the direction of arrow
in the hole at the bottom of the unit,
turn the cam (66) fully in the direction of arrow
A
.
A
SECTION 1
SERVICING NOTES
4
SCD-XB780
DISPLAY BOARD SERVICE POSITION
In checking the DISPLAY board, prepare jig (extension cable J-2501-200-A : 1.00 mm Pitch, 11 cores, Length 300 mm.)
MAIN board
DISPLAY board
CN801
Connect jig (extension cable J-2501-200-A)
to the DISPLAY board (CN801) and
MAIN board (CN706).
to the DISPLAY board (CN801) and
MAIN board (CN706).
CN706
Note:
Follow the assembly procedure in the numerical order given.
INSTALLATION OF THE TRANS BOARD
3
four screws
(PTTWH3
(PTTWH3
×
6)
2
power transformer
(T902)
(T902)
4
3
four screws
(PTTWH3
(PTTWH3
×
6)
1
power transformer
(T901)
(T901)
5
Solder seventeen portions.
Note : Solder the TRANS board after installing power transformers (T901, T902)
to the chassis.
(To prevent the TRANS board from being cracked.)
(To prevent the TRANS board from being cracked.)
5
SCD-XB780
RESETTING OPERATION AT POWER ON
If the power is turned on with a disc loaded in the set, a sequence of operation as shown below will be performed.
(The operation varies depending on the type of disc) Condition: continue mode
(The operation varies depending on the type of disc) Condition: continue mode
(1) CD
1.
1.
Sled reverse move (sled in)
2.
Disc detect
3.
IC setting for CD
4.
Servo error signal offset auto adjustment
5.
Spindle kick for LD on
6.
LD on
7.
Focus search
8.
Focus servo on
9.
Spindle kick
10. Spindle servo on
11. E-F balance auto adjustment
12. Tracking & sled servo on
13. Focus bias auto adjustment
14. Focus servo gain auto adjustment
15. Tracking servo gain auto adjustment
16. Jump to lead-in area
17. Read TOC
18. Stop
11. E-F balance auto adjustment
12. Tracking & sled servo on
13. Focus bias auto adjustment
14. Focus servo gain auto adjustment
15. Tracking servo gain auto adjustment
16. Jump to lead-in area
17. Read TOC
18. Stop
(2) SACD (single layer)
1.
1.
Sled reverse move (sled in)
2.
Disc detect
3.
IC setting for SACD
4.
Servo error signal offset auto adjustment
5.
Spindle kick for LD on
6.
LD on
7.
Focus search
8.
Focus servo on
9.
Spindle kick
10. Spindle servo on
11. E-F balance auto adjustment
12. Tracking & sled servo on
13. Focus bias auto adjustment
14. Focus servo gain auto adjustment
15. Tracking servo gain auto adjustment
16. Jump to lead-in area
17. Read TOC
18. Stop
11. E-F balance auto adjustment
12. Tracking & sled servo on
13. Focus bias auto adjustment
14. Focus servo gain auto adjustment
15. Tracking servo gain auto adjustment
16. Jump to lead-in area
17. Read TOC
18. Stop
(3) SACD (dual layer)
1.
1.
Sled reverse move (sled in)
2.
Disc detect
3.
IC setting for SACD
4.
Servo error signal offset auto adjustment
5.
Spindle kick for LD on
6.
LD on
7.
Focus search
8.
Focus servo on (layer 0)
9.
Spindle kick
10. Spindle servo on
11. E-F balance auto adjustment (layer 0)
12. Tracking & sled servo on (layer 0)
13. Focus bias auto adjustment (layer 0)
14. Focus servo gain auto adjustment (layer 0)
15. Tracking servo gain auto adjustment (layer 0)
16. Jump to lead-in area
17. Read TOC
18. Focus jump (layer 0
11. E-F balance auto adjustment (layer 0)
12. Tracking & sled servo on (layer 0)
13. Focus bias auto adjustment (layer 0)
14. Focus servo gain auto adjustment (layer 0)
15. Tracking servo gain auto adjustment (layer 0)
16. Jump to lead-in area
17. Read TOC
18. Focus jump (layer 0
tlayer 1)
19. E-F balance auto adjustment (layer 1)
20. Tracking & sled servo on (layer 1)
21. Focus bias auto adjustment (layer 1)
22. Focus servo gain auto adjustment (layer 1)
23. Tracking servo gain auto adjustment (layer 1)
24. Focus Jump (layer 1
20. Tracking & sled servo on (layer 1)
21. Focus bias auto adjustment (layer 1)
22. Focus servo gain auto adjustment (layer 1)
23. Tracking servo gain auto adjustment (layer 1)
24. Focus Jump (layer 1
tlayer 0)
25. Stop
6
SCD-XB780
Front Panel Parts
Descriptions
Descriptions
Rear Panel Parts Descriptions
ANALOG
L
L
R
R
2CH OUT
5.1CH OUT
OUT
FRONT
COAXIAL OPTICAL
SURR
CENTER
SUB
WOOFER
DIGITAL(CD)
1
ANALOG 2CH OUT L/R jacks
Connect to an audio component (stereo/2 channel)
using the audio connecting cord.
using the audio connecting cord.
2
ANALOG 5.1CH OUT jacks
Connect to an amplifier equipped with the 5.1CH
input jacks (Multi-channel amplifier, AV amplifier,
etc.) using the audio connecting cords.
input jacks (Multi-channel amplifier, AV amplifier,
etc.) using the audio connecting cords.
3
DIGITAL (CD) OUT COAXIAL connector
Connect to an audio component using the coaxial
digital cable.
digital cable.
4
DIGITAL (CD) OUT OPTICAL connector
Connect to an audio component using an optical
digital cable.
digital cable.
Note
Only the audio signals of the CD can be output from the
DIGITAL (CD) OUT connectors shown in 3 and 4. Those of the
Super Audio CD cannot be output through DIGITAL (CD) OUT.
Only the audio signals of the CD can be output from the
DIGITAL (CD) OUT connectors shown in 3 and 4. Those of the
Super Audio CD cannot be output through DIGITAL (CD) OUT.
SECTION 2
GENERAL
This section is extracted from
instruction manual.
instruction manual.
PHONES
POWER
PHONE LEVEL
MIN
MAX
PUSH ENTER
AMS
TIME/TEXT SACD/CD
MENU
MULTI/2CH
OPEN CLOSE
1
POWER switch
Press to turn on the player.
2
TIME/TEXT button
Each time you press the button, the playing time of the
track, the total remaining time on the disc, or TEXT
information appears in the display.
track, the total remaining time on the disc, or TEXT
information appears in the display.
3
SACD/CD button
Each time you press the button while playing back a
hybrid disc, the layer to be played back switches
between the HD (Super Audio CD) layer and the CD
layer.
hybrid disc, the layer to be played back switches
between the HD (Super Audio CD) layer and the CD
layer.
4
Disc tray
Press
A OPEN/CLOSE to open/close the disc tray.
5
Multi-channel indicator
Turns on when you turn on the player, or when the
Multi-channel Super Audio CD is loaded and select
the Multi-channel playback area by pressing MULTI/
2CH.
Turns on when you turn on the player, or when the
Multi-channel Super Audio CD is loaded and select
the Multi-channel playback area by pressing MULTI/
2CH.
6
A OPEN/CLOSE button
Press to open the disc tray.
Press to open the disc tray.
7
H button
Press to start play.
Press to start play.
8
X button
Press to pause play.
Press to pause play.
9
x button
Press to stop play.
Press to stop play.
0
l AMS L dial (AMS: Automatic Music Sensor)
When you turn the
l AMS L dial
counterclockwise by one click, you go back to the
preceding track; when you turn the
preceding track; when you turn the
l AMS L
dial clockwise by one click, you go to the succeeding
track.
track.
qa
PHONES
Connect the headphones.
During playback of a Multi-channel Super Audio CD,
the same signal that is output from the ANALOG
5.1CH FRONT L/R jacks is output from the PHONES
jack.
Connect the headphones.
During playback of a Multi-channel Super Audio CD,
the same signal that is output from the ANALOG
5.1CH FRONT L/R jacks is output from the PHONES
jack.
qs
PHONE LEVEL
Adjust the headphones volume.
Adjust the headphones volume.
qd
MENU
Press to enter the menu.
Press to exit from the menu and return to the normal
display.
Press to exit from the menu and return to the normal
display.
qf
MULTI/2CH button
Press to select the playback area when the 2 channel +
Multi-channel Super Audio CD is loaded.
Multi-channel Super Audio CD is loaded.
qg
Display window
Shows various information.
qh
m/M buttons
Press to locate a portion you want to play within a
track.
Press to locate a portion you want to play within a
track.