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Report No. 70635
11
FAULT CONDITIONS TESTS-continued
P
Comp.
No.
No.
Location Fault
Test V
Test
time
time
Fuse
No.
No.
Current
through
fuse
through
fuse
Temperature/Results
Q657
B - C
S-c
253
10 min
F901
1,03 A
Unit shut down after 3 sec.
Input current stabilised at 0,014A.
No component damaged.
No hazard.
Input current stabilised at 0,014A.
No component damaged.
No hazard.
Q661
C - E
S-c
253
10 min
F901
3,97 A
Unit shut down after 4 sec.
Input current stabilised at 0,014A.
Q657 damaged.
No hazard.
Input current stabilised at 0,014A.
Q657 damaged.
No hazard.
Q661
B - C
S-c
253
10 min
F901
1,03 A
Unit shut down after 3 sec.
Input current stabilised at 0,014A.
No component damaged.
No hazard.
Input current stabilised at 0,014A.
No component damaged.
No hazard.
C631
-
S-c
253
30 min
F901
1,02 A
Center output off immediately.
Unit shut down immediately.
Input current stabilised at 1,02A.
R631 opened.
No hazard.
Unit shut down immediately.
Input current stabilised at 1,02A.
R631 opened.
No hazard.
Speaker
Terminal
Terminal
Front
(
(
L - ch.)
S-c
253
10 min
F901
2,99 A
Unit shut down immediately.
Input current stabilised at 0,014A.
No component damaged.
No hazard.
Input current stabilised at 0,014A.
No component damaged.
No hazard.
Top cover
opening
opening
-
Blocked 253
13 min
F901
1,12 A
The components are heated up to:
- Main transf. pr. Winding : 71K
- Main transformer core
- Main transf. pr. Winding : 71K
- Main transformer core
: 55K
- Sub transf. pr. Winding : 47K
- Sub transformer core
- Sub transformer core
: 41K
- D992 body
: 53K
- PWB near D992
: 53K
and unit shut down after 13 min.
Input current stabilised at 0,014A.
Dielectric strength test OK.
No hazard.
Input current stabilised at 0,014A.
Dielectric strength test OK.
No hazard.
Pmax
operating
- Maximu
m non-
clipped
output
signal
clipped
output
signal
253
9 min
F901
2,45 A
The components are heated up to:
- Main transf. pr. Winding : 137K
- Main transformer core : 59K
- Sub transf. pr. Winding : 48K
- Sub transformer core
- Main transf. pr. Winding : 137K
- Main transformer core : 59K
- Sub transf. pr. Winding : 48K
- Sub transformer core
: 41K
- D992 body
: 74K
- PWB near D992
: 78K
and main transformer’s thermal
fuse opened after 9 min.
Dielectric strength test OK.
No hazard.
fuse opened after 9 min.
Dielectric strength test OK.
No hazard.
F No = Fault Number, S-c = Short-circuit, Dis = Disconnection
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