Denon UD-M50, D-A03 Service Bulletin

100 Corporate Drive Mahwah, NJ 07430

Service Bulletin

No. : OST-705
Date: June 21, 2007

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Model: UD-M50, D-A03

Subject: Change in FM Front-end and the peripheral parts

Symptom: We changed the Front-end manufacturer due to discontinuation of

production of the Front-end manufactured by KEC used for the subject models.
According to this change the Front-end and its peripheral parts will be changed
as outlined in the next section.

Solution:

• The Front-end manufactured by KEC was changed to the one manufactured by
KWANG SUNG ELECTRONICS.

• Appearance of the Front-end is the same as before and pins are compatible. No
P.W. Board has been changed.

• When replacing the Front-end, the following peripheral resistors and capacitors
have to be replaced since they differ before and after the replacement of the
Front-end.

• Please be sure to confirm the indicated type numbers of the Front-ends RF1
and FR401, and be sure to use proper resistors and capacitors.

Note: When replacing the Front-end, confirm the indicated type number of the
actually installed parts on the unit, and be sure to use proper parts corresponding
to the Front-end manufacturer.

DETAILS OF THE CHANGE, AND THE CAUTION:

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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:

______________________________________________________________________________________

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: