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harman/kardon Service Bulletin
Service bulletin # H/K2000-02 Rev1 January 2001Warranty labor rate: MAJOR repair
To: All harman/kardon Service Centers
Models: AVR300, AVR500
Subject: Random Noise, Erratic Output in DTS Mode
In the event you receive an AVR300 or AVR500 receiver with the complaint ?there is distortion, random
noise or gaps in the program material when in the DTS mode?, perform the following procedure:
REMOVAL AND MODIFICATION OF THE DSP BOARD
1) Remove the top cover, (14) Black Phillips screws.
2) Locate the DSP PC Board; Figure 1. Remove the two metal braces at the top of the unit. If necessary, cut
the cable ties attached to the braces to move any wires away from the area.
3) Pull the white 22 conductor ribbon cable at the rear of the DSP PC Board straight out of its receptacle.
4) Unplug the white 5 conductor molex cable at the top of the DSP PC Board.
5) Remove the (33) plated Phillips screws on the left side of the rear backplate; see Figure 2. Do not remove
any additional screws on the right side. If using a power tool, use care and minimum effort to avoid damaging
the various plastic receptacles.
6) Remove all three black plastic plugs that cover the optical inputs at the rear of the DSP PC Board.
7) Pull on the left side of the rear backplate, away from the receiver chassis; you should be able to pull it away
enough to allow the DSP PC Board to be pulled straight up and out of the receiver.
8) Proceed with the modifications on page 2.
ModelSerial NumberSerial Number
STATUSACTION
120V230V RDS
TH0001-01000TH0005-01000
AVR300Modifications to DSP Board:
ToToRandom Noise, Erratic
Add ground wire;
TH0001-13886TH0005-03317Output or Gaps in Program
Change R756 & R755
AVR500TH0002-01000TH0006-01000Material when in DTS Modefrom 600 resistor or Capacitor
ToTo
to 33 resistor
TH0002-10460TH0006-02795
AVR300TH0001-13887TH0005-03318
Or higherOr higher
Modified by factoryNONE REQUIRED
AVR500TH0002-10461TH0006-02796
Or higherOr higher
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