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100 Corporate Drive Mahwah, NJ 07430
Service Bulletin
No. : OST-F1112
Date: February 2, 2007
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Model: DCM-390, DCM-290, and DCM-27
Subject: Correction of the Firmware and the voltage of power supply.
Symptom: Insert Disc (any Disc), mechanical noise is heard after a short time
in Playback mode. This is because the Clamper Mechanism doesn't move to the
proper position and the Mechanism does not work smoothly.
Solution: The Microprocessors firmware has been improved. Resistor values
changed and a Zener Diode has been added to the power supply for loading
motor. See the following for details.
6. MODIFICATION:
6-1. Replace the Resistors and add Diodes on SERVO P.W.B UNIT.
1) Replace the R133, 134 Chip Resistors to 20 k ohms.
2) Add the 4.7 Volts Zener Diode MTZJ4.7B to ZD103 in parallel on the FOIL
side of SERVO P.W.B UNIT.
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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.
Figure of SERVO P.W.B
______________________________________________________________________________________
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.
6-2. Updating software.
Cautions: