Denon POA-A1HDCI Service Bulletin

100 Corporate Drive Mahwah, NJ 07430

Service Bulletin

No. : OST-C1528
Date: July 1, 2009

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Model: POA-A1HDCI

Subject: Change the voltage of power supply for OP amplifier.

Countermeasure is applicable only upon claim from the customer.

Symptom: The unit goes into protection mode.

Solution:

supply, but few OP amplifiers was damaged by over "+15/-15 volts".
COUNTERMEASURE: We pulled down the voltage of the power supply from
"+18/-18 volts" to "+15/-15 volts".

1) 1U-3798-1 AMP UNIT:

a) IC102, IC103: SA5532ADR (00D2623555901)→NJM5532M-D (TE-

1)(00D2630898907)

b) ZD101, ZD102: HZS22-1 (00D2760480900)→HZS20-1TD (00D2760479908)

2) 1U-3798-2 INPUT UNIT: a) JV39, JV42, JV58: Jumper Wire→HZS3B-2TD

(00D2760453911)

See the following picture for details.

Generally OP amplifier is not defective at "+18/-18 volts" power

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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:

______________________________________________________________________________________

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.

b) Cut the pattern of minus line in IC104.
c) Solder the diode HZS3B-2 to the PCB with a RUBBER SHEET under the
component (on PC board).

d) IC101, IC104: SA5532ADR (00D2623555901)→SE5532AD8R2G
(232810020503S)

3) 1U-3797-3/4/5/6/7 CONNECT UNIT:

a) IC511, IC512, IC513, IC514, IC515: SA5532ADR
(00D2623555901)→SE5532AD8R2G (232810020503S)

______________________________________________________________________________________

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.