100 Corporate Drive Mahwah, NJ 07430
Service Bulletin
No. : OST-F1031
Date:
January 23, 2007
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Model: AVR-886, AVR-2106, AVR-786, AVR-1906, AVR-686, AVR-1706,
AVR-486, AVR-1506, AVR-1306
Subject: Countermeasure for preventing the Power Amplifier Circuit from
breaking down.
Symptom: The transistor that is used to compensate the temperature rise of
the Power Transistor in the Output Stage is incapable of reacting to the rapid
temperature rise. Because the temperature rise is not compensated properly the
Power Amplifier Circuit may be damaged.
Solution:
and/or refurbishment of the unit. (The replacement of the capacitor and resistor is
applicable to each channel (C, FL, FR, SL, SR, SBL and SBR).
Please replace Transistor Q103 and resistor R101 upon repair
Parts:
Ref# Description Part Number
Q103 (C, FL, FR, SL,
SR, SBL and SBR)
R101 (C, FL, FR, SL,
SR, SBL and SBR)
2SC3964,
Transistor
RD14B2E681JT,
680Ω Resistor
00D 963 0280 107
00D 241 2398 913
______________________________________________________________________________________
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:
Modification Procedure:
1) Remove the Top Cover, and take out the Main P. W. Board from the unit.
(Refer to the Service Manual.)
2) Replace the Transistor and Resistor:
Remove Q103, 2SD947F Transistor (Q103FL, Q103FR, Q103C, Q103SL,
Q103SR, Q103SBL and Q103SBR) and replace it with the 2SC3964 Transistor.
Note -There is no SBL and SBR on the models AVR-1306.
Remove R101, 2.7kΩ resistor (R101FL, R101FR, R101C, R101SL, R101SR,
R101SBL and R101SBR) and replace it with the 680Ω resistor.
Note - There is no SBL and SBR on the models AVR-1306.
3) Adjust the Idling Voltage: Turn the Power of the unit on. Then, after 10
minutes, adjust the Voltage to 2.0 mV ±0.5 mV. (Refer to the Service Manual for
more details).
4) Reassemble the Main Unit and attach the Top Cover.
Serial Number Range:
Applicable serial number range (last 5 digits)
MODEL (BLACK) Serial Number MODEL (SILVER) Serial Number
AVR-2106 BKE3 00001 ~ 17001 AVR-886 SRE3 00001 ~ 04001
AVR-1906 BKE3 00001 ~ 19538 AVR-786 SRE3 00001 ~ 04908
AVR-1706 BKE3 00001 ~ 15538 AVR-686 SRE3 00001 ~ 06508
AVR-1506 BKE3 00001 ~ 03540 AVR-1506 SRE3 00001 ~ 02501
-- -- AVR-486 SRE3 00001 ~ 19309
______________________________________________________________________________________
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: