Denon AVR-1909, AVR-789, DZ09-339 Service Bulletin

100 Corporate Drive Mahwah, NJ 07430

Service Bulletin

No. : DZ09-339
Date: April 26, 2010

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Model: AVR-1909, AVR-789
Subject: Correction of the Firmware via DFW (D&M Firmware Writer).

Countermeasure is applicable only upon claim from the customer.

Symptom: 1) Crackling noise on surround back speakers during playback of

DTS-HD-MSTR 6.1 disc (BD "The Descent")

2) There is the case that a sound does not out from subwoofer when turn on the
power of the unit in the state that Multi EQ is Enable.

Solution:

METHOD OF UPDATING the firmware via RS232C.

We will supply the following program files for updating the subject models.
Please refer to the following Instruction Manual for updating.

DFW software

DFW_0029_AVR_AVC1909_AVR789_(Rev.1.0.11).exe:

Firmware Update Program

DFW_0029_AVR_AVC1909_AVR789_Rev.1.0.11_manual_EN.pdf:
Instruction Manual for Firmware Update Program

AVR1909CI_AVR1909_AVC1909_AVR789_DZ09-339.bin.zip:

Firmware

We corrected the firmware so that no malfunction occurs.

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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:

Serial Number Range:

Please apply the above modification to the production models in the following
serial numbers.

______________________________________________________________________________________

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: