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100 Corporate Drive Mahwah, NJ 07430
Service Bulletin
No. : OST-F935b
Date:
May 23, 2007
_____________________________________________________________
Model: AVR-2105, AVR-885
Subject: The Power Amplifier Circuit breaks down during Playback.
Symptom: The Power Amplifier Circuit breaks down during Playback because
the operating time of the ASO protection circuit for the Power Transistor was too
long.
Solution:
• Modification Procedure:
1) Remove 9 screws.
2) Remove the TOP Cover (see the following for details)
Replace C175 220µF Capacitor with 22µF Capacitor.
______________________________________________________________________________________
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:
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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.
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3) Remove 2 screws on MAIN P.W.B.
4) Remove the PRE 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.
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5) Remove Capacitor C175 (220µF) on the Main P.W.B., and replace it with a
22µF Capacitor.
______________________________________________________________________________________
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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6) Solder a new 22uF/25V capacitor into D132 anode and R179.
7) Stand it up vertically after soldering.
______________________________________________________________________________________
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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8) Assemble the PRE P.W.B. on the Main P.W.B.
9) Reattach 2 screws.
10) Top Cover on the unit.
11) Reattach 9 screws.
12) Finished.
______________________________________________________________________________________
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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Parts:
Ref# Description Part Number
C175 CE04W1E220MT
00D 254 4541 913
SMG/RE3, 22uF/25V
Serial Number Range:
AVR-2105 5033323738 ~
AVR-885 5043304703 ~
______________________________________________________________________________________
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:
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