Service Manuals, User Guides, Schematic Diagrams or docs for : DENON Personal Audio System Personal Audio System Denon - D-M37 Service Bulletin OST-C1552
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100 Corporate Drive Mahwah, NJ 07430
Service Bulletin
No. : OST-C1552
Date: August 6, 2009
_____________________________________________________________
Model: D-M37S
Subject: Correction of the Firmware.
Countermeasure is applicable only upon claim from the customer.
Symptom: When customer powers the unit off, then on again with the power of
unit at "1~7" position of volume, the volume of left channel increases loudly for
approximately 1.5 second.
Solution: We have improved the software so that no malfunction occurs.
MODIFICATION: Replace the SYSTEM Micon (IC24 on the MCU P.W.B. UNIT
ASS'Y) with the improved MICON (Ver. 09072201) only upon claim from the
customer.
Confirmation of the Version:
1) Turn off the Power of the unit.
2) While holding the "ON/STANDBY" and "SDB/TONE" buttons on the unit down
simultaneously, switch the Power on.
3) The version of firmware for SYSTEM Micon will indicate on the FL Display.
4) When you push the "MENU/SET" button, you will see version of USB Micon.
5) Turn off the power of unit.
Replacement of the Main Microprocessor:
1) Take out the Main P.W.B. Ass'y from the unit according to the Service Manual.
2) Remove the old Main Microprocessor.
3) Attach the improved new Microprocessor.
4) Assemble the unit according to the Service Manual.
______________________________________________________________________________________
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.
Initializing procedure:
Turn off the Power of the unit. While holding the "MENU/SET" and " I<< / - "
buttons on the unit down simultaneously, switch the Power on.
Parts:
Ref# Description Part Number
IC24 IC, FLASH U-COM 943243008740D
Serial Number Range:
We have applied the above modification to production models from the following
serial numbers. (First 5 digits)
90866***** ~
______________________________________________________________________________________
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.
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