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SCD-XE680
Pages
76
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Service Manual
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Device
Audio
File
scd-xe680.pdf
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Sony SCD-XE680 Service Manual ▷ View online

11
SCD-XE680
Test Mode Command List
The contents of test mode are as follows.
Note:
Wrong operation in the test mode causes a trouble, thus requiring extreme care.
LINE command (0X): Use mainly for a manufacturing line.
No.
Name
Description
Remarks
00
RFAmp Read
Each register set value of the IC001 (RF AMP) is displayed via RS-232C
Not used for the servicing
05
DSP MON1
XUGF, XPCK, C2PO outputted from IC509 (CD DSP)
Not used for the servicing
06
DSP MON2
MNT0, MNT1, MNT2, MNT3 outputted from IC509 (CD DSP)
Not used for the servicing
07
DSP MON3
RFCK, XPCK, XROF, GTOP outputted from IC509 (CD DSP)
Electrical measurement,
CD CLV jitter measurement
STANDARD command (1X): Use when the servo is applied by manual operation.
No.
Name
Description
Remarks
12
LD ON/OFF
The laser diode is turned on or off
On or off are switched alternately
13
SPIN ON/OFF
The spindle motor is rotated with the regulated voltage
On or off are switched alternately
14
FSRV ON/OFF
The focus servo is turned on or off
On or off are switched alternately
15
TSRV ON/OFF
The tracking servo is turned on or off
On or off are switched alternately
16
CLV ON/OFF
The spindle SLV servo is turned on or off
On or off are switched alternately
Focus and tracking servos must be already turned on
17
SSRV ON/OFF
The sled servo is turned on or off
On or off are switched alternately
Focus, tracking and spindle servos must be already turned on
18
ALL SRV ON
All servos are turned on
19
ALL SRV OFF
All servos are turned off
Stop command in the test mode
FOCUS command (2X): Focus related. (All servos must be already turned on (except command 21))
No.
Name
Description
Remarks
21
FSRCH ON/OFF
The continuous vertical motion of the optical pick-up lens is turned on or
Avoid a long-time use
off
On or off are switched alternately
22
F-BIAS UP
Increase focus bias
Focus bias value
23
F-BIAS DOWN
Decrease focus bias
Focus bias value
24
ADJ FCSBIAS
The focus bias is adjusted automatically
Both + and - directions are searched to search for best jitter point
25
FGAIN UP/DW
The focus servo gain is switched between normal and down
Normal or down are switched alternately
27
FOCUS AGC
The focus servo gain is adjusted automatically
OFFSET (PI, FE, TE) command (3X): Adjusts the offset of PI, FE and TE signals.
No.
Name
Description
Remarks
31
PI/FE OFSET
Adjusts the offset of PI, FE and TE signals
TE offset adjustment is executed for the CD
This adjustment must be executed after 61 DISC DETECT
only
SECTION  4
TEST  MODE
In this set, various checks are automatically performed by executing
the commands in the test mode.
Note:
 This set makes adjustment every optical pick-up and stores its result
in the EEPROM (IC903) on the MAIN board. Accordingly, if a
combination of optical pick-up and EEPROM is changed, be sure
to perform 4-3. SET CHECK. Also, perform 4-1. IC INTERFACE
CHECK, 4-2. DISPLAY CHECK, and 4-6. WAVEFORMS CHECK.
Disc for Test Mode
Various checks of this set require the following discs.
Model
Type 
*
1
Category
Application
MODEL
SATD-S5
12 cm disc
Adjusted value check,
(J-2501-215-A) SL
Reference disc
Operation check,
SATD-S4
Optical waveform check
(J-2501-184-A)
Not specified
DL
12 cm disc
Operation check
PATD-012
Adjusted value check,
(4-225-203-01)
CD
12 cm disc
Operation check,
YEDS-18
Reference disc
Optical waveform check
(3-702-101-01)
Not specified
HYBRID 12 cm disc
Operation check
*1 SL: Single Layer
DL: Dual Layer
Setting Method of Test Mode
Turn the 
[POWER]
 button on while pressing the 
[        AMS        ]
dial and the 
[MENU]
 button. Release the 
[MENU]
 button and the
[         AMS         ]
 dial in this order when “DIAG MODE” is displayed
on the fluorescent indicator tube.
Releasing Method of Test Mode
To release the test mode, turn the 
[POWER]
 switch off.
Selection/Entry of Test Mode
To select and enter the “DIAG MODE”, operate as follows.
1. Rotate the 
[        AMS        ]
 dial to select the menu, and press
the 
[        AMS        ]
 dial to enter.
2. The test is switched on or off alternately each time the
[        AMS        ]
 dial is pressed.
3. To return to the previous step, rotate the 
[        AMS        ]
 dial
to select the desired item, and press the 
[        AMS        ]
 dial
to enter.
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12
SCD-XE680
TRACKING command (4X): Tracking servo related.
No.
Name
Description
Remarks
41
TGAIN NM/UP
The tracking servo gain is switched between normal and up
Normal or up are switched alternately
44
ADJ TRK DSP
The traverse AGC and E-F balance adjustment is performed
45
TRACKING AGC
The tracking servo gain is adjusted automatically
SEARCH command (5X): Track search related. (Nos. 51 through 53 are not used for the servicing.)
No.
Name
Description
Remarks
51
1-TRCK JUMP
One-track jump is performed
52
FINE SEARCH
Fine search is performed
53
M-TRCK MOVE
M-track movement is performed
DISC DETECT command (6X): Disc type check related.
No.
Name
Description
Remarks
Disc type check is executed
Display after judgment
61
DISC DETECT
DSKMOD CD: Judged as CD
Refer to how to apply servo by manual
DSKMOD SL: Judged as SACD (SL)
operation (See page 13)
DSKMOD DL: Judged as SACD (DL)
DSKMOD HYB: Judged as HYBRID
62
CD SETTING
Enter disc type    CD setting
CD forced setting
63
SL SETTING
Enter disc type    SL setting
SL forced setting
64
DL SETTING
Enter disc type    DL setting
DL forced setting
6F
Download
Not used for the servicing
LASER command (7X): Laser of optical pick-up related.
No.
Name
Description
Remarks
7A
ADDTIME CD
Cumulative light emission time of the laser for CD is displayed
 (Initialized by 8D command)
7B
ADDTIME HD
Cumulative light emission time of the laser for SACD is displayed
 (Initialized by 8D command)
7C
FJUMP TEST
Not used for the servicing
TOOLS command (8X): Performs aging, reads adjusting parameters, etc.
No.
Name
Description
Remarks
81
VERSION
Firmware version is displayed
Example: Ver 1.00
83
TRAY AGING
Tray open-close aging is performed
Not used for the servicing
87
DISP ADJ DT
Automatic adjusting parameters are displayed via RS-232C
Not used for the servicing
8A
FL CHECK
Display of fluorescent indicator tube and keys are checked
8D
SETUP MODE
Set to factory shipping mode
Set when repair completed
PLAY MODE, etc. are initialized
Refer to 4-5. SHIPPING MODE (See page 16)
QA command (9X)
No.
Name
Description
Remarks
91
FJUMP CHECK
The focus jump is checked
Not used for the servicing
92
SET CHECK
The set is checked
Refer to 4-3. SET CHECK (See page 14)
93
WATER MARK
Not used for the servicing
94
SET AGING
The set aging is performed
Not used for the servicing
Repeat by the specified number of times or until an error occurred
95
FJMP CHK BU
The focus jump is checked (for jig)
Not used for the servicing
9C
BU DENCHO
The S curve waveform, traverse waveform, and RF waveform can be
Refer to 4-6.WAVEFORMS CHECK
checked successively
(See page 16)
9D
PLAY&RFD ON
SACD playback, RFD output
Not used for the servicing
SACD jitter measuring mode
9E
RFD ON/OFF
RFD output is turned on or off
Not used for the servicing
SACD jitter measuring mode
IC command (AX)
No.
Name
Description
Remarks
A0
IC SELF CHK
Each IC and its communication are checked
Normal or up are switched alternately
13
SCD-XE680
How to Apply Servo by Manual Operation
In analyzing failures of the set, the servo may be applied by manual
operation. To apply servo in the test mode, use the following
method.
1. After setting the test mode, rotate the 
[        AMS        ]
 dial to
select a command, and press the 
[        AMS        ]
 dial to enter.
2. “61 DISC DETECT” (Disc type check)
t“18 ALL SRV ON”
(All servos on + auto adjustment)
3. If applying servo while checking the condition one by one,
“61 DISC DETECT” (Disc type check)
t“31 PI/FE OFSET”
(Offset automatic adjustment)
t“14 FSRV ON/OFF” (Focus
servo on)
t“16 CLV ON/OFF” (CLV servo on) t“44 ADJ
TRK DSP ” (E-F balance adjustment)
t“15 TSRV ON/OFF”
(Tracking servo on)
t“17 SSRV ON/OFF” (Sled servo
on)
t“24 ADJ FCSBIAS” (Focus bias adjustment) t“27
FOCUS AGC” (Focus auto gain adjustment)
t“45
TRACKING AGC” (Tracking auto gain adjustment).
Note:
1. On and off are alternately switched in the same command.
2. For a stop, select “19 ALL SRV OFF” and press the 
[         AMS         ]
dial.
4-1. IC INTERFACE CHECK
The communication between microcomputer and main ICs is
checked.
Checking Method:
1. After setting the test mode, rotate the 
[        AMS        ]
 dial to
select “A0. IC SELF CHECK” and press the 
[        AMS        ]
dial to enter.
2. A checking will start automatically. (Checking time is about 3
seconds)
3. At successful completion of check, “IC CHECK OK” is dis-
played. In this case, no error exists in the IC interface.
Note:
The check mentioned above tests the communication from micro-
computer to main ICs. Even if the check successfully finished, the
IC to be checked is not always normal. Consider it for reference
only.
4. In case of an IC communication error, the following display
will be given during the checking. Possible causes of error are
as listed below.
Error display
Causes  (typical example)
DVD DEC. ERROR
1. IC701 (SACD decoder) is faulty
2. IC701 pin <znv (XRST) does not go “H”
• IC901 pin ts (XDIS IO) does not go “H”
• IC904 (PLD) is faulty
3. 768fs (33.8688 MHz) is not present to
IC701 pin <znm (XTAL)
• IC811 (3-multiplying circuit) is faulty
• Clock signal 256fs is not sent from
AUDIO board (CN701 pin qg)
• CN702 pin 6 (GND) and pin 7
(+3.3V-D) are open or shorted
• CN701, 702 and FFC connection is loose,
or FFC is disconnected
DVD DRAM ERR
1. IC706 (D-RAM) is faulty
2. IC701 pin <znv (XRST) does not go “H”
• IC901 pin ts (XDIS IO) does not go “H”
• IC904 (PLD) is faulty
3. Faulty communication line between
IC701 and IC706
• Data line, address line, WE, etc.
4. D903 (1SS367) is faulty
D+3.3V is not present to IC706
CD DSP ERROR
1. IC509 (CD DSP) is faulty
2. 768fs (33.8688 MHz) is not present to
IC509 pin ua (XTAL)
Same as cause 3 of DVD DEC. ERROR
3. IC509 pin 2 (XRST) does not go “H”
• IC901 pin ts (XDIS IO) does not go “H”
• IC904 (PLD) is faulty
Error display
Causes  (typical example)
EEPROM ERROR
1. IC903 (EEPROM) is faulty
SAMBA DRAM ERR
1. IC808 (D-RAM) is faulty
(DSD decoder is also
2. IC801 (DSD decoder) is faulty
checked)
3. 768fs (33.8688 MHz) is not present to
IC801 pin qa (MCKI)
Same as cause 3 of DVD DEC. ERROR
4. IC801 pin 9 (XRST) does not go “H”
• IC901 pin ts (XDIS IO) does not go “H”
• IC904 (PLD) is faulty
5. Faulty communication line between
IC801 and IC808
• Data line, address line, WE, etc.
6. D904 (1SS367) is faulty
D+3.3V is not present to IC808
RF AMP ERROR
1. IC001 (RF AMP) is faulty
2. Loose connection between CN708 on
MAIN board and CN005 on RF board,
or FFC disconnection
CN708 pin qj (CLK RF), pin qh (DATA
RF) and pin qg (SDEN) must be checked
SD BUS ERROR
1. IC701 SD bus and IC801 AV decoder
interface is faulty
2. IC812 to 814 are faulty
Causes Common to Each IC:
1. Faulty communication line between microcomputer and each
IC.
Disconnected patterns, floating series resistors, bridge, etc.
2. Faulty IC supply voltage.
Particularly, check D+3.3V voltage.
3. Faulty microcomputer communication port to each IC
Note:
In case of more than two errors, the error display is switched over
one after another, thus making the reading difficult.
In such a case, press again the 
[        AMS        ]
 dial to make a
recheck for error reading.
4-2. DISPLAY CHECK
Checking Method:
1. After setting the test mode, rotate the 
[        AMS        ]
 dial to
select “8A. FL CHECK” and press the 
[        AMS        ]
 dial to
enter.
2. Respective segments of fluorescent indicator tube will
automatically light up in order, and therefore check that there
is no chipped character.
3. The “INPUT REMOCON” will be displayed after the segment
check finished successfully, and then press a proper key on
the remote commander.
4. After “JOG CHECK” is displayed, the numbers of calendar
will be displayed from 1 to 15 each time the 
[        AMS        ]
dial is rotated clockwise.
5. After display up to 15, the numbers of calendar will
disappear in order each time the 
[         AMS         ]
 dial is
rotated counterclockwise.
6. “TTX-1514?” will be displayed when all are cleared, and then
rotate the 
[        AMS        ]
 dial to select tke TTX-1515 press
the 
[        AMS        ]
 dial.
7. Upon display of “KEY CHECK”, if a key on the display is
pressed, the corresponding segment of fluorescent indicator
tube will light up.
8. “FL TEST END” will be displayed if all keys are pressed.
Note: The keys include the 
[        AMS        ]
 dial. If the segment that
corresponds to the pressed key does not light up, that key is faulty.
9. The test mode selection display will be back, if the 
[         AMS         ]
dial is pressed.
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14
SCD-XE680
4-3. SET CHECK (AUTOMATIC VARIOUS MEASUREMENTS)
The operational stability of the set is checked. The check and OK/NG judgment are performed automatically.
Note
: In the set check using the CD, besides a checking, the MIRR time used for the disc check is measured every optical pick-up, and from the measured
result, the threshold value is calculated and it is stored in the EEPROM (IC903) on the MAIN board. Accordingly, if a combination of optical pick-
up and EEPROM is changed (for example, the optical pick-up or MAIN board is replaced), be sure to perform the set check using the following CD.
As the data stored in the EEPROM are overwritten every set check, retry if failed. For the set check using the SACD, only checking is made.
Set Check
CD and SACD (SL) Disc Operation Check
Checking method:
1. After setting the test mode, rotate the 
[        AMS        ]
 dial to select “SET CHECK” and press the 
[        AMS        ]
 dial to enter.
2. Upon display of “AUTO CHECK SP?”, further press the 
[        AMS        ]
 dial.
3. The tray will open automatically, and then set the test disc*1 of CD or SACD.
4. With the “DISC IN&JOG ON” displayed, press the 
[        AMS        ]
 dial, and the check will be executed automatically.
5. “SPEC OK!” will be displayed if the measured result is within the specification. Faulty item name and the measured result wil l be
displayed if any measured item is NG.
6. After that, “AUTO CHECK SP?” will be again displayed, and then rotate the 
[        AMS        ]
 dial to select “CHECK END?”. Further,
press the 
[        AMS        ]
 dial, and the test mode selection display will be back, and then press the 
[OPEN/CLOSE    ]
 button and take
the test disc out.
*1 Use PATD-012 or YEDS-18 for CD, and SATD-S5 or SATD-S4 for SACD (SL). Using another disc will result in a checking failure.
Measured Items:
Items
Description
Remarks
Offset values before RF (PI), VC, FE, TE signal offset adjustment
At offset 0
RF/VC/FE/TE (ORG)
RF (8 bit data in hex notation)
RF: A0h
VC, FE, TE (9 bit data in hex notation)
VC, FE, TE: 00h
Offset values after RF (PI), VC, FE, TE signal offset adjustment
VC offset is not adjusted
RF/VC/FE/TE (ADJ)
(Less than ORG value if offset correction is normal)
(Measurement only)
RF (8 bit data in hex notation)
Also, for SACD, the TE offset is
VC, FE, TE (9 bit data in hex notation)
not measured and adjusted
PI (ORG): PI value at disc type check (decimal data)
PI level conversion
PI (ADJ): PI value after PI offset adjustment
Read value 
×
 12.9mV
(read value at microcomputer A/D) (decimal data)
PI/TRVS PP (ORG/ADJ)
TRVS PP (ORG): Traverse level before level correction (AGC)
Traverse level conversion
(decimal data)
Read value 
×
 12.9mV
TRVS PP (ADJ): Traverse level after level correction (AGC)
(decimal data)
12.9mV=3.3V 
÷
 256 (8 bit)
PIOR: Set value of PI offset coarse adjusting register
Registers in RF amplifier
PIOR/CCR/TRCR
CCR: Set value of FE offset coarse adjusting register
TRCR: Set value of TE offset coarse adjusting register
FOCUS/TRK GAIN
Auto gain adjusted values of focus and tracking servos
(8 bit data in hex notation)
FBIAS: Focus bias set value (9 bit data in hex notation)
TRCR2 adjusts the E-F gain
TRVSC: Traverse center value (9 bit data in hex notation)
balance and used for CD only
FBIAS/TRVSC/TRCR2/CFR
TRCR2: Set value of E-F balance coarse adjusting register
(Fixed to 06 for SACD)
CFR: Set value of traverse level adjusting register
TRCR2 and CFR are registers in
RF amplifier
PSP AMPLITUDE
SACD only
1-LAST TRK SEEK (msec)
Average seek time from first track to last track of disc
Error rate measurement
For the CD, Measure for 7 sec at track
ERROR RATE
For CD: Average value/Maximum value of C1 and C2
No.5
For SACD: Average value/Maximum value of PO, PI1 and PI2
For the SACD, calculation from 100-
block data at track No.5
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92. SET CHECK
AUTO CHECK SP?
AUTO CHECK?
DISP RESULT S?
CHECH END?
DISP RESULT F?
The set check is executed to judge OK or NG.
(For the CD, the threshold value is stored in the EEPROM)
The measured result is displayed on the fluorescent indicator tube.
The set check of measurement only is executed.
The measured result is displayed via RS-232C.
The set check is finished.
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