Denon AVR-1804, AVR-884 Service Bulletin

100 Corporate Drive Mahwah, NJ 07430

Service Bulletin

No. : OST-790
Date:

May 10, 2007

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Model: AVR-1804, AVR-884

Subject: Countermeasure for play in the Rotary Encoder Shaft.

Symptom: There customer complains of “play” or looseness in the Master

Volume shaft.

Solution:

• The improved rotary encoder included the following two items for reducing the
play between the Shaft and the bearing:

1) The width of the bearing section is changed to 7mm from 4mm to increase
bearing area of the Rotary Encoder.

2) A frame emboss was added to shorten the gap between the shaft and the
frame. (Convex 0.1 mm)

Modification Procedure:

•

1) Remove 9 screws on the side and rear of the Top Cover, and remove the Top
Cover. (Refer to the Fig. 1.)

2) Remove the 8 screws that are fixing Front Panel to Chassis, remove 5
Connectors, and remove the Front Panel Assembly from the unit. (Fig. 2)

3) Remove the MASTER VOLUME Knob and SELECT Knob. Remove 15
screws and two nuts that are fixing the Display P. W. Board.

4) Replace the Rotary Encoders. (Refer to the Service Manual VEC301, 302.)

An updated rotary Encoder is available.

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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:

Parts:

Ref #

FORMER NEW

Description Part Number Description Part Number

VEC301,302 ENCODER SW 963 0102 007 ENCODER SW 963 0122 304

______________________________________________________________________________________

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: