Harman Kardon AVR 300, Руководство по обслуживанию

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harman/kardon Incorporated 250 Crossways Park Drive, Woodbury New York 11797 (516) 496-3400
harman/kardon
Service Bulletin
Service bulletin # H/K2000-02 Rev1 January 2001 Warranty 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.
Model Serial Number
120V
Serial Number
230V RDS
STATUS ACTION
AVR300
AVR500
TH0001-01000
To
TH0001-13886
TH0002-01000
To
TH0002-10460
TH0005-01000
To
TH0005-03317
TH0006-01000
To
TH0006-02795
Random Noise, Erratic
Output or Gaps in Program
Material when in DTS Mode
Modifications to DSP Board:
Add ground wire;
Change R756 & R755
from 600 W resistor or Capacitor
to 33 W resistor
AVR300
AVR500
TH0001-13887
Or higher
TH0002-10461
Or higher
TH0005-03318
Or higher
TH0006-02796
Or higher
Modified by factory NONE REQUIRED