HK 3480 (serv.man2) - Harman Kardon Audio EMC - CB Certificate (repair manual). Page 44

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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 
C601 S-c 207 -  10 
min. 
F601, 
F603, 
F604 
10,7 A 
Output signal off immediately. 
Input current stabilised at 0,12A. 
F603, F604 opened. 
No hazard. 
(Repeated test three times with 
the same result) 
Q319 
S-c 
253 
C - E 
10 min.  F601, 
F603, 
F604 
4,18 A 
Unit shut down immediately. 
Input current stabilised at 0,09A. 
Q317, Q319, Q321, Q311, Q315, 
R349, R325, R347, R353, R337, 
R329 damaged. 
No hazard. 
Q319 
S-c 
253 
B - C 
10 min.  F601, 
F603, 
F604 
3,09 A 
Unit shut down immediately. 
Input current stabilised at 0,25A. 
Q323, Q309, Q317, Q319, Q321, 
R347, R331, R361, R359, R355, 
R349 damaged. 
No hazard. 
Q321 
S-c 
253 
C - E 
10 min.  F601, 
F603, 
F604 
- 
Unit shut down immediately. 
Input current stabilised at 0,21A. 
Q319, Q321, Q317, Q313, Q309, 
R351, R353, R335, R331 
damaged. 
No hazard. 
Q321 
S-c 
253 
B - C 
10 min.  F601, 
F603, 
F604 
7,00 A 
Unit shut down immediately. 
Input current stabilised at 0,21A. 
Q315, Q311, Q321, Q319, Q317, 
R351, R353, R347, R349, R333, 
R337 damaged. 
No hazard. 
C307 S-c 253 -  30 
min. 
F601, 
F603, 
F604 
2,60 A 
L ch. signal output off immediately.
Input current stabilised at 0,98A. 
R307, R351, R353 opened. 
No hazard. 
C309 S-c 253 -  40 
min. 
F601, 
F603, 
F604 
2,40 A 
L ch. signal output off immediately.
Input current stabilised at 0,97A. 
R353, R307 opened. 
No hazard. 
F No = Fault Number, S-c = Short-circuit, Dis = Disconnection
 
 
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