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XV-D721BK
XV-D723GD
* Automatic adjustment/Jitter value indication
1.Enter the set into the "servo signal system check mode" of the TEST mode.
2.Open the tray with the OPEN key of the set. Set the TEST disk VT-501 on the tray and put back the tray with
the CLOSE key. Then, press the PAUSE key.
The TEST disk starts rotation to execute automatic adjustment. If the set is in the normal condition, the
"CHECK OK" message appears. If there is something abnormal in the adjustment values, an error message
appears and it mostly comes from a failure in the servo system (including the mechanism and pickup). In
such the event, refer to the check points by errors.
When using the TEST disk VT-501, carefully check to see if there is neither damage nor dirt on the read
surface of the disk beforehand.
3.Press the STOP key to return the check mode to the initial status.
4.After the automatic adjustment with the TEST disk completes, press the PLAY key.
The disk starts rotation and a jitter value (signal read precision in percentage) appears on the FL display (JIT
0***). If the indication value (in *** places) is 110 (11 %) or less, it can be judged by this simple checking
method that the signal read precision of the set is satisfactory.
Before using the TEST disk VT-501, carefully check it if there is neither damage nor dirt on the read surface.
5.Press the STOP key to return the mode to the initial status.
Upgrading microcomputer software
The internally incorporated microcomputer software of this set can be revised in part for the reason that the set
is designed to conform to new standards and to be capable of playing disks to be put on the market by other
manufacturers. To upgrade the internal microcomputer software, use the upgrade disk and follow the procedure
mentioned below.
* How to upgrade the microcomputer software
1.Set the upgrade disk in the set and enter it into the TEST mode.
2.After confirming that the set completes reading of the upgrade disk data while looking at the indication on the
monitor screen, change the TEST mode to the microcomputer software upgrading mode and then press the
PLAY key.
3.The set completes writing of the upgrade disk data approximately 1 minute later and it is automatically reset
by the self-resetting function. Then the set again reads the upgrade disk and stops automatically.
4.Take the upgrade disk out of the set and turn it off with the POWER ON/OFF key.
5.Again enter the set into the TEST mode, and press the SKIP key and then the PAUSE key.
6.Make sure that the DVD AUDIO indicator goes on a few seconds after the above-mentioned operation, check
the version number of the microcomputer software in the microcomputer software version number indication
mode.
*Carefully carry out the above procedure. If data write is interrupted in the middle of course by power failure
or careless shutdown operation, not only the data of the internal software may be damaged but the set may
fail in resetting. The version number of the internal microcomputer software is shown as follows.
FL indication:
**
**
**
[IC901] [IC401] [IC508/IC509] Symbol number of microcomputer IC
Initializing the set
Initialization of the set returns it to the initial status at shipment.
Be sure to initialize the set after repair service.
* How to initialize the set
1.Enter the set into the TEST mode and press the SKIP key first and the PAUSE key second.
2.Make sure that the DVD AUDIO indicator goes on a few seconds later.
DVD AUDIO copyright protection
To protect the DVD AUDIO copyright from infringement, a number proper to each DVD AUDIO set called a
device key is assigned to each set. If a proper device key is not set for a set, it fails in playing a copyrighted
disk.
The management number of the device key of a set can be checked by the DVD AUDIO copyright protection
key serial indication in the TEST mode. If the "???...." message appears in this check mode, the set has a
failure in the device key. If it occurs, inquire at the Service Section of the Audio and Communication Division,
JVC.
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