AVR 345 - Harman Kardon Audio EMC - CB Certificate (repair manual). Page 48

 

 

- Page 4 of 7 - 

 

 

 

Report No.  79765 

 

 

 

 

 

Comp. 
No. 

Location  Fault 

Test V 

Test  
time 

Fuse 
No. 

Current 
through 
fuse 

Temperature/Results 

Q803 

E - C 

S-c 

253 

10 min 

F901 

3,1 A 

Unit shut down immediately. 
Input current stabilised at 0,018A. 
Q803, Q804, R810 and  
R817 damaged. 
No hazard. 

Q803 

B - C 

S-c 

253 

10 min 

F901 

- 

Unit shut down immediately. 
Input current stabilised at 0,018A. 
Q852, Q804, R810 and  
R818 damaged. 
No hazard. 

Q804 

E - C 

S-c 

253 

10 min 

F901 

10,1 A 

Unit shut down immediately. 
Input current stabilised at 0,018A. 
Q803, Q852, R810 and  
R817 damaged. 
No hazard. 

C807 

S - c 

253 

- 

30min 

F901 

2,40 A 

Surr. L ch. output voltage dropped 
to 4,2V ac immediately. 
Input current stabilised at 2,2A. 
R821 opened. 
No hazard. 

D901 

A - C 

S-c 

253 

6 min 

F901 

2,39 A 

Sub transformer primary winding 
heated up to 97K and thermal fuse
opened after 5 min 14 sec. 
Dielectric strength test O.K. 
No hazard. 

C906 

- 

S-c 

253 

10 min 

F901 

0,08 A 

Unit shut down immediately. 
Sub transformer primary winding 
heated up to 101K and thermal fuse
 opened after 5 min 42 sec. 
Dielectric strength test O.K. 
No hazard. 

Speaker 
terminal  

Front 
R ch. 

S-c 253 10 

min 

F901 

- 

Unit shut down immediately. 
Input current stabilised at 0,018A. 
No component damaged. 
No hazard. 

Top cover 
opening 

- Blocked 

253 

5 

min 

29 sec 

F901 

2,35 A 

Unit shut down after 5 min 29 sec. 
Input current stabilised at 0,018A. 
Dielectric strength test OK. 
No hazard. 

F No = Fault Number, S-c = Short-circuit, Dis = Disconnection