AVR 355 (serv.man6) - Harman Kardon Audio EMC - CB Certificate (repair manual). Page 46

 

 

- Page 38 of 42 - 

 

 

 

 

Report No.  98388 

 

*), Fan stalled 

(Center of main heat-sink);

 

Normal operated. 

Measured temperature for components;

 

1) Main transformer primary winding 
2) Main transformer core 
3) Sub transformer primary winding 
4) Sub transformer core 
5) PCB near D991 
and stabilised. Input current stabilised at 2,54A.   
No component damaged. No hazard.  (Tested time: 1 hr 30 min) 

 
 
 

1) 87,5K 
2) 70,3K 
3) 69,4K 
4) 64,7K 
5) 73,0K 

 
 
 

1) 150K 
2) 150K 
3) 150K 
4) 150K 
5) 110K 

*), Ventilation opening (Blocked); 
Unit shut down after 14 min. 

Measured highest temperature for components;

 

1) Main transformer primary winding 
2) Main transformer core 
3) Sub transformer primary winding 
4) Sub transformer core 
5) PCB near D991 
Input current stabilised at 0,03A. No component damaged. 
Dielectric strength test OK.  No hazard.  (Tested time: 14 min) 

 
 
 

1) 104,1K 

2) 83,6K 
3) 77,9K 
4) 71,2K 

5) 104,3K 

 
 
 

1) 150K 
2) 150K 
3) 150K 
4) 150K 
5) 110K 

*), Pmax operated (Maximum non-clipped output signal); 
Main transformer primary winding heated up to 142,8K and thermal fuse  
opened after 28 min.  Input current stabilised at 0,03A. 
Dielectric strength test OK.  No hazard.  (Tested time: 28 min) 

Main transf. 

142,8K 

Main transf.

150K 

 

 

 

*)  Tested voltage 253V               **)  Tested voltage 198V 

F No = Fault Number, S-c = Short-circuit, Dis = Disconnection, O-I = Over Loaded