CONFIDENTIAL
Technical Tip
18 Park Way, Upper Saddle River, NJ 07458
Date: April 6, 2006
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Model: TX-SR803/SR703, DTR-4.6/5.6/6.6/7.6
Subject: High pitched noise is heard in the subwoofer.
Symptom: A high pitched noise or, a motorboat noise can be heard when using the
Optical, Coaxial or HDMI input.
Solution: If the DSP board (U03) is marked NADG-8660-1 (see board version
pictures) modify the DSP board as follows:
Relocate resistor R175 (47ohm) to location R149.
______________________________________________________________________________________
This document and the information it contains is intended for the exclusive use of Authorized ONKYO Service Centers and their
employees. This document may contain information that is privileged, confidential and exempt from disclosure under applicable law
and terms of the ONKYO Service Agreement. Any dissemination, distribution or copying of this document and the information it
contains is strictly prohibited.
CONFIDENTIALITY NOTICE:
Add a jumper wire to foil side of board between the ground legs of C432 and C442.
______________________________________________________________________________________
This document and the information it contains is intended for the exclusive use of Authorized ONKYO Service Centers and their
employees. This document may contain information that is privileged, confidential and exempt from disclosure under applicable law
and terms of the ONKYO Service Agreement. Any dissemination, distribution or copying of this document and the information it
contains is strictly prohibited.
CONFIDENTIALITY NOTICE:
Board version 1 can be identified by the ink stripe marking. One line indicates the board
is version one.
______________________________________________________________________________________
This document and the information it contains is intended for the exclusive use of Authorized ONKYO Service Centers and their
employees. This document may contain information that is privileged, confidential and exempt from disclosure under applicable law
and terms of the ONKYO Service Agreement. Any dissemination, distribution or copying of this document and the information it
contains is strictly prohibited.
CONFIDENTIALITY NOTICE:
Two or more lines indicate a later revision board.
Note: On later revision boards, R175 is a zero ohm resistor and R149 already has a 47
ohm resistor mounted on the board. In this case, you just need to add the jumper wire.
Parts:
Ref# Description Part Number
R175 47 ohm carbon resistor
RN72K1J-470JE
435034704R1
______________________________________________________________________________________
This document and the information it contains is intended for the exclusive use of Authorized ONKYO Service Centers and their
employees. This document may contain information that is privileged, confidential and exempt from disclosure under applicable law
and terms of the ONKYO Service Agreement. Any dissemination, distribution or copying of this document and the information it
contains is strictly prohibited.
CONFIDENTIALITY NOTICE:
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