Harman Kardon AVR 7200, Руководство по обслуживанию

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harman/kardon
Service Bulletin
Service bulletin # H/K2003-04 June 2003 Warranty labor rate: MINOR repair
To: All harman/kardon Service Centers
Model: AVR7200
Subject: Noise
In the event you receive an AVR7200 with the complaint: “there is a “static”, snapping, or ticking
sound periodically coming from one or more of the speakers”, follow the instructions below:
The amplifiers inside Harman/Kardon AVRs are capable of extremely high power. With seven channels of
on-board amplification, there is potential for significant heat generation. Suggestions for the most efficient
and reliable AVR operation include:
1) Cabinets: Keep an open space of at least of 2-3" to the sides and top of the receiver.
2) Do not block the ventilation holes in the top cover, as these are crucial.
3) Whenever possible, the AVR7200 should be the top component in the stack, or put on its own shelf.
4) If used in cabinet with a closed door, be sure to provide adequate ventilation between other components
and the AVR7200 rear panel. In extreme cases an external fan may be required.
If the problem persists even with adequate ventilation, change resistors R162, R223, R252, R295 on the
DSP board from 10.0
Ω
to 2.2
Ω
.
Procedure:
5) Remove the top cover (18 Phillips screws).
6) Locate 10.0
Ω
SMD resistors R162, R223, R252, R295 in the center of the DSP board at the top of the
unit. Unsolder and replace each with 2.2
Ω
SMD resistor, h/k part# P2.2GCT-ND.
7) Replace the top cover and test the unit.
MODELS SERIAL NUMBER STATUS ACTION
AVR7200 All Serial Numbers Affected May Need Modification If Noise Present
Change R162, R223, R252, R295
from 10.0
Ω
to 2.2
Ω
AVR7200
harman/kardon
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