AVR 300 (serv.man14) - Harman Kardon Audio Technical Bulletin (repair manual)

avr 300 (serv.man14) technical bulletin
Model
AVR 300 (serv.man14)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
341.45 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
Audio
File
avr-300-sm14.pdf
Date

Read Harman Kardon AVR 300 (serv.man14) Technical Bulletin online

 
harman/kardon Incorporated  250 Crossways Park Drive, Woodbury  New York 11797  (516) 496-3400 
1
 
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
 resistor or Capacitor 
 to 33
 resistor 
 
AVR300 
 
AVR500 
 
 
TH0001-13887 
Or higher 
TH0002-10461 
Or higher 
 
TH0005-03318 
Or higher 
TH0006-02796 
Or higher 
 
 
Modified by factory 
 
 
NONE REQUIRED 
 
harman/kardon Incorporated  250 Crossways Park Drive, Woodbury  New York 11797  (516) 496-3400 
2
Models: AVR300, AVR500   Subject: Random Noise, Erratic Output in DTS Mode 
 
 
9) Ground Reinforcement: 
 
Using an insulated 16AWG wire, Connect Negative sides of the following capacitors on the bottom side of the 
PCB as shown below. Negative side of each cap will have a white mark on the component side of the PCB. 
A.  Negative polarity of C746 Elec Cap (1uF/50V) in the proximity of ROM IC709 
B.  Negative polarity of C749 Elec Cap (1uF/50V) in the proximity of IC708 DSP IC 
C.  Negative polarity of C744 Elec Cap (1uF/50V) in the proximity of IC710 74VHC574 
      C   
 B 
 A 
 
 
 
 
10)   Replace: 
R756 & R755.  Original parts may be 600
 resistors, or Capacitors.  Change both to 33
 1/10W 
SMD resistors (h/k part#
 292-33.2)
. See location below. 
 
 
 
 
11) Replace DSP PC Board back into its (3) receptacle plugs atop the MAIN PCB. 
12) Replace all screws, braces, and any cable ties that were cut during disassembly. Before tightening the 
screws, make sure all PCB’s and their RCA jacks are firmly seated in their respective holes in the rear 
backplate. If using a power tool, use care and minimum effort to avoid damaging the various plastic 
receptacles. 
13) Plug both the 22 conductor ribbon cable and the 5 conductor molex cable back into their receptacles. 
14) Replace the top cover and optical plugs. 
15) Test unit by powering up the receiver and playing a source with DTS encoded material; confirm the complaint 
of Random Noise or  Erratic Output is no longer occurring. 
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Here you can read online and download Harman Kardon AVR 300 (serv.man14) Technical Bulletin in PDF. AVR 300 (serv.man14) technical bulletin will guide through the process and help you recover, restore, fix, disassemble and repair Harman Kardon AVR 300 (serv.man14) Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.