Denon AVR-391 Service Bulletin

100 Corporate Drive Mahwah, NJ 07430

Service Bulletin

No. : DZ10-128
Date:

November 8, 2010

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Model: AVR-391, DHT-391XP

Subject: Correction of the Firmware.

Countermeasure is applicable only upon claim from the customer.

Symptom: 1) We have received several reports from customers that AVR-

391's will freeze intermittently. Controls do not work.

2) When signal level is changed, the AutoDetect function might not work
properly, and then sound might not be produced.

Solution:

Please refer to Service Manual.
Time necessary for update: approximately 10 min.

File Name: AVR1311_AVR391_DZ10-128.zip
Boot Tool: AVR1311_AVR391_BootTool_M330-1.zip

Firmware Version :

We corrected the firmware so that no malfunction occurs.

Confirming the firmware’s number after upgrading:
Plug AC cord into power outlet while pressing both the "DIMMER" button and
"STATUS" button on the front panel simultaneously. Push "STATUS" Button
then the version of the firmware is indicated.

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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:

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

AVR-391: 0116641701 ~
DHT-391XP: 0116647201 ~
DHT-391XP (Black): 0116641501 ~

______________________________________________________________________________________

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: