Nad C-272 Service Information
Technical Bulletin
C272
Date:
Note:
Previous T.B.’s required:
DESCRIPTION: The ATO Logic of the amplifier does not always turn on when using the
RCA inputs.
REASON: The incoming level of the signal is not triggering the ATO Logic circuit.
SOLUTION: Increase the sensitivity of the ATO turn on logic circuit. Change the following
resistors.
1. Locate the Input sense pc board behind the rear panel. See Figure 1.
Figure 1
June 27/05 Subject: ATO Logic Sensitivity
Implemented in production starting from serial #: H42C27202477
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2. Change R901 and R902 from 1 M ohm to 330k ohm.
Product: Amplifier
Hardware Technical Bulletin: C272-H2005-01
YES
NO
Contact:
NAD Electronics International
633 Granite CourtPickering, ON Canada L1K 3K1
Voice: 905-831-0799 FAX 905-837-6357
www.nadelectronics.com
Locaton of R901 and
R902 behind the
sense/defeat switch
at the rear panel.
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