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100 Corporate Drive Mahwah, NJ 07430
Service Bulletin
No. : OST-C1375
Date: September 2, 2008
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Model: AVR-1708, AVR-1508, AVR-588, AVR-688, AVR-488
Subject: Countermeasure for defective "HDMI P.W.B. UNIT".
Symptom: 1) In the DSP processing mode, noise occurs from the speaker.
2) In the DSP processing mode, the audio signal is not output from the speaker.
3) In the DSP processing mode, the noise is output, and the audio signal is not
output afterwards.
4) When the HDMI input is used, the video signal is not output
Note: A slight amount of pressure on the HDMI board may temporarily restore
normal operation.
Solution: The "Board to board connector" becomes a loose/intermittent
connection because of excessive flux.
MODIFICATION:
1) Remove the Top cover.
2) Remove 3 screws on the Back Panel side where the "HDMI P.W.B. UNIT" is
fixed.
3) The wires inserted in the "HDMI P.W.B. UNIT" are removed. (4 connectors:
CP904, CP405, CP406 and CP404)
4) The "HDMI P.W.B. UNIT" is pulled out from the "CPU P.W.B. UNIT" and using
a commercially available flux remover to clean the connectors. Insert the "HDMI
P.W.B. UNIT" into the "CPU P.W.B. UNIT" then remove and re-insert the boards
repeatedly five times to clean the connections. If flux remover is not available just
pull the "HDMI P.W.B. UNIT" out from the "CPU P.W.B. UNIT" and remove and
re-insert the boards repeatedly five times to clean the connections.
5) Fix the screws with the Back panel and Top cover.
______________________________________________________________________________________
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.
Tip: Please repair the set when the symptom is not improved (exchange of
"HDMI P.W.B. UNIT", etc.).
Serial Number Range:
We will apply the above modification to all production models listed beginning
from the following serial numbers. (First 5-digits)
71233***** ~
______________________________________________________________________________________
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.