SCD-XA3000ES - Sony Audio Service Manual (repair manual). Page 18

18

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).

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.

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.

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

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.

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

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.

Note: The keys include the 

[        AMS        ]

 dial. If the segment that

corresponds to the pressed key does not light up, that key is faulty.

8. Press the 

[POWER]

 button to turn the power off.

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