HK 3480 (serv.man2) - Harman Kardon Audio EMC - CB Certificate (repair manual). Page 45

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- Page 4 of 7 - 
 
 
www.nemko.com
 
Report No.  65743 
 
 
11 
FAULT CONDITIONS TESTS-continued
 
P 
Comp. 
No. 
Fault Test 
V Short 
current 
Test 
time 
Fuse No Current 
through 
fuse 
Mains power/temperatures/results 
D615 
S-c 
253 
A - C 
17 min 
- 
1,76 A 
Sub transformer primary winding 
heated up to 117K and thermal 
fuse opened after 17 min. 
Dielectric strength test OK. 
No hazard. 
D613 
S-c 
253 
A - C 
30 min 
- 
1,67 A 
Normal operating. 
Input current stabilised at 1,67A. 
No component damaged. 
No hazard. 
C625 
S-c 
253 
- 
19 min 
- 
0,05 A 
Unit shut down immediately. 
Sub transformer primary winding 
heated up to 118K and thermal fuse 
opened after 19 min. 
Dielectric strength test OK. 
No hazard. 
C626 
S-c 
253 
- 
2 hr 
- 
0,02 A 
Unit shut down immediately. 
Sub transformer primary winding 
heated up to 73K and stabilised. 
Dielectric strength test OK. 
No hazard. 
D606 
S-c 
253 
A - C 
30 min 
F601 
1,67 A 
Normal operating. 
Input current stabilised at 1,67A. 
No component damaged. 
No hazard. 
C622 
S-c 
253 
- 
30 min 
F601 
1,69 A 
Normal operating. 
Input current stabilised at 1,69A. 
No component damaged. 
No hazard. 
SPK 1 
terminal 
S-c 
253 
L - G 
10 min 
F601, 
F603, 
F604 
6,20 A 
Unit shut down immediately. 
Input current stabilised at 0,01A. 
No component damaged. 
No hazard. 
Cover 
opening 
Blocked 253 
- 
18 
min.  F601, 
F603, 
F604 
1,67 A 
The components are heated up to: 
- Main transf. pr. Winding  : 74K 
- Sub transf. pr. winding 
: 45K 
- PWB near D601 
: 60K 
- PWB near Q319 
: 73K 
- Main heat-sink 
: 83K 
and protection circuit operated. 
Input current stabilised at 0,01A. 
Dielectric strength test OK. 
No hazard. 
F No = Fault Number, S-c = Short-circuit, Dis = Disconnection 
 

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