Denon AVR-681, AVR-1601, AVR-1801 Service Bulletin

100 Corporate Drive Mahwah, NJ 07430

Service Bulletin

No. : OST-614
Date:

April 27, 2007

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Model: AVR-681, AVR-1601, AVR-1801

Subject: A malfunction of the Memory Backup System.

Symptom: When the unit is left for longer than 10 minutes after disconnecting

the AC Power Cord, the unit enters the initial mode and no memory backup is
carried out.

Solution:

2) Cut the circuit patterns connected to Pins #53 and #54 of IC201.

3) Attach the Rubber Sheet outlined in the Parts section.

4) Solder the lead wire of the Cathode side of Diode so that the Pins #53 and#54
are short circuited. Then, connect the other terminal of the Diode to theJ205.

5) Assemble the unit.

1) Remove the CPU Unit (1U- XXXXX).

Parts:

Ref# Description Part Number

NA 1SR35-400A(T93X) 276 0704 903
NA Rubber Sheet 461 0415 007

Serial Number Range:

• AVR-1601: 00001 ~ 005060 No modification applied.

• AVR-681: 00001 ~ 002000 No modification applied.

• AVR-1801: 000182 ~ 000243 No modification applied.

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