Service Manuals, User Guides, Schematic Diagrams or docs for : DENON AV Surround Receiver & Amplifier AV Surround Receiver & Amplifier Denon - AVR-2105 & 885 & AVC-1890 Service Bulletin OST-F1034
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100 Corporate Drive Mahwah, NJ 07430
Service Bulletin
No. : OST-F1034
Date: November 24, 2009
_____________________________________________________________
Model: AVR-885, AVR-2105, AVR-785, AVR-1905, AVR-685, AVR-1705,
AVR-485, AVR-1505
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 following the rapid
temperature rise. Because the temperature rise is not compensated for properly
the Power Amplifier Circuit may be damaged
Solution: The circuit has been corrected so that the temperature rise of the
Power Transistor is compensated properly.
MODIFICATION: (Upon repair) Replace all Q103 Transistors and all R101
resistors in the unit with the improved parts. (The replacement of the transistor
and resistor is applicable to each channel of C, FL, FR, SL, SR, SBL and SBR.)
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