Sales Demonstration Lock Function; Service Precautions - Denon DVM-4800 Service Manual

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3.6 Sales demonstration lock function

This function prevents discs from being lost when the unit is used for sales demonstrations by disabling the disc eject
function. "LOCKED" is displayed on the unit, and ordinary operation is disabled.
Setting
The sales demonstration lock is set by simultaneously pressing STOP button on the player and POWER button on the
remote control unit.
Cancellation
The lock can be cancelled by the same procedure as used in setting. ("UNLOCKED" is displayed on cancellation.
Disconnecting the power cable from power outlet does not cancel the lock.)

3.7 Service Precautions

3.7.1 Recovery after the DVD player is repaired
When an FROM or an EEPROM in and on the module P .C.B. has replaced, carry out the recovery disc processing to
optimize the drive.
Playback the disc above to process the recovery automatically.
Recovery disc (Product number: RFKZD5TR001)
Note:
This unit requires no initialization process carried out after the traditional DVD players were repaired.
When the recovery measures are taken, the customer setting will return to the factory setting as same as the procedure
described in item of "Initialization" in 2.2 is carried out. Write down the contents of the setting before recovery processing,
and reset the player.
3.7.2 Firmware version-up of the DVD player
The firmware of the DVD player may be renewed to improve the quality including operationability and playerbility to the
substandard discs processing to optimize the drive.
The version-up disc has also a recovery function so that you don't need use the recovery disc again.
Note:
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If the AC power supply is shut out during version-up due to a power failure, the version-up is improperly carried out.
In such a case, replace the FROM and carry out the version-up again.
The product number of the version-up disc will be noticed when it is supplied.
3.7.3 Initialization of DVD Player
Initialize the DVD player when replacing CPU and its peripheral parts, and Mother P .W.B., etc.
How to Initialize
Pressing the "STILL/PAUSE" + "SKIP REW" + "OPEN/CLOSE" buttons at once makes DVD player initialization (factory
setting condition). "INITIALIZED" is indicated on the screen and "INITIALIZE" on the display of the main unit.
Note
When the initialization has been made, the contents of user setting is lost.
Therefore, memorize the contents of user setting prior to the initialization and re-set them again after the initialization.
3.7.4 Setting after Repair
After finishing the repair work, follow the steps below.
Setting Condition
At the power on state,
1) Press the "OPEN/CLOSE" button to close the tray.
2) Turn the power off.
3) Unplug the power cord from the wall outlet.
Note
Do not close the tray manually after disconnecting the power cord from the wall outlet in tray open condition.
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