Read Harman Kardon SIGNATURE 2.0 (serv.man7) Technical Bulletin online
harman/kardon
Service Bulletin
Service bulletin # H/K9709 Dec. 1997
To:
All harman/kardon Service Centers
Models: Signature 2.0 Processor/Tuner
Subject: Turn on/ turn off “thump”
In the event you receive a Signature 2.0 that is being used with a power amplifier other than the
Signature 2.1 which exhibits a “thump” when the unit is turned ON or OFF:
Signature 2.1 which exhibits a “thump” when the unit is turned ON or OFF:
When a power amplifier other than the Signature Series 2.1 is used with the
Signature Series 2.0
Processor/Tuner, you may experience a mild turn-on or turn-off “thump”. The Signature 2.1 power
amplifier has a delay circuit that prevents this from happening.
amplifier has a delay circuit that prevents this from happening.
There was a running change made by the factory that will prevent this symptom using any power
amplifier. The change was made starting with the serial numbers listed below:
amplifier. The change was made starting with the serial numbers listed below:
Model
Serial number
120V
Serial number
230V
Status
Action
Signature 2.0
GT0003-01001
to
GT0003-02162
GT0006-01001
to
GT0006-01157
Mild turn-on
or turn-off “thump”
when not using 2.1
Call for factory
replacement of
unit under warranty
Signature 2.0
GT0003-02163
and above
GT0006-01158
and above
Factory Installed
Modification
NONE REQUIRED
To replace a unit under these conditions, please contact harman/kardon to obtain a unit for
exchange in the latest serial number range listed above.
exchange in the latest serial number range listed above.
harman/kardon Incorporated 250 Crossways Park Drive, Woodbury New York 11797 (516) 496-3400
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