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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: Please replace Transistor Q103 and resistor R101 upon repair
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).
Parts:
Ref# Description Part Number
Q103 (C, FL, FR, SL, 2SC3964, 00D 963 0280 107
SR, SBL and SBR) Transistor
R101 (C, FL, FR, SL, RD14B2E681JT, 00D 241 2398 913
SR, SBL and SBR) 680 Resistor
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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.
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, 2.7k resistor (R101FL, R101FR, R101C, R101SL, R101SR,
R101SBL and R101SBR) and replace it with the 680 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