Bulletin Hk9709 - Harman Kardon SIGNATURE 2.0 Service Manual

harman/kardon
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:
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.
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:
Model Serial number
Signature 2.0 GT0003-01001
GT0003-02162
Signature 2.0 GT0003-02163
and above
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.
harman/kardon Incorporated 250 Crossways Park Drive, Woodbury New York 11797 (516) 496-3400
Serial number
120V 230V
GT0006-01001
to
GT0006-01157
GT0006-01158
and above
Mild turn-on
to or turn-off "thump"
when not using 2.1
Factory Installed
Modification
31
Service Bulletin
Repair rate does not apply
Status
unit under warranty
NONE REQUIRED
Action
Call for factory
replacement of