Denon DVD-555, DVD-755, DVD-1710, DVD-1910 Service Bulletin

100 Corporate Drive Mahwah, NJ 07430

Service Bulletin

No. : OST-846b Date:

May 23, 2007

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Model: DVD-555, DVD-755, DVD-1710, DVD-1910

Subject: Upgrading the Firmware for improving the following symptoms.

1) Malfunction upon opening the Tray.

2) Alteration of the Screen width.

Symptom: 1) Regarding the malfunction upon opening the Tray.

(a.) If the customer mistakenly unplugs the AC cord from the AC outlet while playing a disc while the Pick-up remains on the disc (except the innermost circumference). The malfunction will occur. (b.) A very strong shock is applied to the unit. (c.) Power was turned on there is a case that the Tray does not open.

2) During the PAL-DVI output, both sides of the screen are missing.

Cause:

When a strong shock is applied, the Cam Slider moves to where it touches the Tray Gear. If the Power was turned on and the Tray was opened under the above condition, the Pick-up moves to the initial position (inner circumference). As a result, the Pick-up can not enter the groove of the Cam Slider and the Tray does not open.

2) Regarding the PAL-DVI output: The malfunction occurs due to bugs in the Firmware.

1) Regarding the malfunction upon opening the Tray:

Solution: The Firmware has been corrected so that the following malfunctions

do not occur.

1) Regarding the malfunction upon opening the Tray: Changed the movement of the Pick-up when the Power of the unit was turned on so that it returns to the initial position after it moves to the outer circumference once.

2) Regarding the PAL-DVI issue: The firmware has been updated so that the screen width is widened properly.

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The information contained in this document is intended for the exclusive use by DENON Authorized Service Centers and their employees. This document may contain information that is privileged, confidential and may be protected from disclosure under applicable laws and terms of the DENON Service Agreement. Any distribution, disclosure, dissemination or copying of this document and the information it contains is prohibited. No responsibility will be accepted by DENON for any damage, injury or loss resulting from the misuse of the information contained in this document.

CONFIDENTIALITY NOTICE:

MODIFICATION: (Upon customer claim) Record the files separately onto a CD-R and update the Firmware on your customer's unit upon claim.

• The program files:

• Versions after the update: All of the versions are "1.10".

• Update Procedures: Please refer to the Service Manual.

1) To improve the malfunction upon opening the Tray: We changed the movement of the Pick-up so that it moves to the outer circumference once and returns to the initial position, when the AC is supplied and the Power was switched on.

• You are unable to perform the update operation unless the Tray opens. Therefore, open the Tray according to the following procedures. (1) Remove the Top Cover. (2) Rotate the Gear A on the mechanism counterclockwise until it stops. (Refer to the Figs. 1 and 2 for the Gear location.)

(3) Turn on the Power of the unit, push the "OPEN/CLOSE" button and confirm that the Tray can be opened and closed. (4) Press the "ON/STANDBY" button so that the unit enters STANDBY mode. (5) Update the Firmware of the unit by means of the CD-R disc for updating.

Attention: If the Power is interrupted during the update operation you will have to replace the DVD Main CBA Unit with a new one.

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CONFIDENTIALITY NOTICE:

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