FL 8300 (serv.man9) - Harman Kardon Audio Technical Bulletin (repair manual)

              harman/kardon Incorporated   80 Crossways Park West, Woodbury New York 11797 (516) 496-3400

 

 

 

 
 
Service bulletin #  9703   June 1997   

 

 

 

Warranty labor rate: MAJOR repair 

 
 To: 

All harman/kardon Service Centers 

 
 Models:  FL8300 
 
 Subject:  Dead unit, no display;  Service upgrade 
 

 

 
Due to current surges, early models of the FL8300 could repeatedly damage R701 (either a 1 ohm resistor or 
1.5A micro fuse depending on version).  Along with the replacement of R701, the positive lead should be 
relocated on C125 to suppress any future current surges. 
 
Additionally, two capacitors, now designated as C907 & C908, (1uf/50v) should be added to the power supply 
output pins on regulator IC108 & IC111 on a unit serviced for any reason; these will add stability to help prevent 
oscillation.   
 
PROCEDURE:  
 
1)   Replace R701 with micro-fuse H/K # 5508722221, this component is on PCB7. 
2)   A PCB trace should be cut on the C125 (2200 uf/25v) positive lead on the main circuit board and an insulated 

jumper wire attached from that lead to the junction of D109/110.  Additionally another insulated jumper will 
need to replace the trace that was cut. (see drawing) 

3)   Add C907 & 908, 1uf/50v , H/K/ # 3479310971, one on each output pin to ground on regulators IC108 and 

IC111.  This is most easily accomplished by: 

     Soldering one 1uf cap to the jumpers 153 & 197.  Observe polarity; J153 is ground. 
     Soldering one 1uf cap to the jumpers 185 & 186.  Observe polarity; J186 is ground. 
 
 

FL8300 

 

IN0019-72213 

and below 

NOT REQUIRED 

R701 is damaged or 

an open circuit 

Replace R701, 

re-route positive connection 

on C125, 

Add C907/908 

FL8300 

 

IN0019-72214 

and above 

NOT REQUIRED 

Modified by factory 

NONE REQUIRED 

 
 
 
 
 
 

              harman/kardon Incorporated   80 Crossways Park West, Woodbury New York 11797 (516) 496-3400