Denon AVR-2106, AVR-886, AVR-786, AVR-1906, AVR-686 Service Bulletin

...

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

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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

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CONFIDENTIALITY NOTICE: