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SCD-XB790
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 will 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)
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
CCR: Set value of FE offset coarse adjusting register
TRCR: Set value of TE offset coarse adjusting register
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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