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- Page 3 of 7 - 

 

 

 

Report No.  65654 

 
 

 

Comp. 
No. 

Location  Fault 

Test V 

Test  
time 

Fuse 
No. 

Current 
through 
fuse 

Temperature/Results 

D991 

AC - + 

S-c 

253 

10 min 

F907 
F903 
F904 

- Normal 

operating. 

Input current stabilised at 1,76A. 
F904 opened.  No hazard. 
(Repeated test three times with the 
same result) 

C902 -  S-c 207 10 

min 

F907 
F903 
F904 

- 

Front, Surr Back channels signal 
output off immediately. 
Input current stabilised at 0,85 A. 
F903, F904 opened. 
No hazard. 
(Repeated test three times with the 
same result) 

C902 -  S-c 253 10 

min 

F907 
F903 
F904 

- 

Front, Surr Back channels signal 
output off immediately. 
Input current stabilised at 0,89 A. 
F903, F904 opened. 
No hazard. 
(Repeated test three times with the 
same result) 

D992 

AC - + 

S-c 

207 

10 min 

F907 
F905 
F906 

- Normal 

operating. 

Input current stabilised at 1,70A. 
F906 opened. 
No hazard. 

D992 

AC - + 

S-c 

253 

10 min 

F907 
F905 
F906 

- Normal 

operating. 

Input current stabilised at 1,78A. 
F906 opened. 
No hazard. 

C915 -  S-c 253 10 

min 

F907 
F905 
F906 

- 

Center, Surround channels signal 
output off immediately. 
Input current stabilised at 1,21A. 
F905, F906 opened. 
No hazard. 

Q803 

C - E 

S-c 

207 

10 min 

F907 
F905 
F906 

- 

Unit shut down immediately. 
Input current stabilised at 0,01A. 
F905, F906 opened. 
No hazard. 

Q803 

C - E 

S-c 

253 

10 min 

F907 
F905 
F906 

- 

Unit shut down immediately. 
Input current stabilised at 0,01A. 
F905, F906 opened. 
Q804 shorted. 
No hazard. 

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

 

 

 

 

- Page 4 of 7 - 

 

 

 

Report No.  65654 

 
 

 

Comp. 
No. 

Location  Fault 

Test V 

Test  
time 

Fuse 
No. 

Current 
through 
fuse 

Temperature/Results 

Q803 

B - C 

S-c 

253 

10 min 

F907 
F905 
F906 

- 

Unit shut down immediately. 
Input current stabilised at 0,01A. 
No component damaged. 
No hazard. 

C807 -  S-c 253 20 

min 

F907 
F905 
F906 

2,16 A 

Surround L channel signal output 
distorted immediately. 
Input current stabilised at 1,61A. 
R821 opened. 
No hazard. 

Q804 

C - E 

S-c 

253 

10 min 

F907 
F905 
F906 

- 

Unit shut down immediately. 
Input current stabilised at 0,01A. 
F905, F906 opened. 
Q903, Q804 shorted. 
No hazard. 

Q804 

B - C 

S-c 

253 

10 min 

F907 
F905 
F906 

- 

Unit shut down immediately. 
Input current stabilised at 0,01A. 
No component damaged. 
No hazard. 

C813 -  S-c 253 20 

min 

F907 
F905 
F906 

1,56 A 

Surround L channel signal output 
off immediately. 
Input current stabilised at 1,56A. 
No component damaged. 
No hazard. 

D962 

A - C 

S-c 

253 

15 min 

- 

1,78 A 

Sub transformer primary winding 
heated-up to 109K thermal fuse 
opened after 15 min. 
Dielectric strength test O.K. 
No hazard. 

C906 

- 

S-c 

253 

14 min 

- 

< 0,03 
A 

Mains relay off immediately. 
Sub transformer primary winding 
heated-up to 111K thermal fuse 
opened after 14 min. 
Dielectric strength test O.K. 
No hazard. 

C907 

- 

S-c 

253 

1 hr 

- 

< 0,02 
A 

Mains relay off immediately. 
Sub transformer primary winding 
heated-up to 80K and stabilised. 
Dielectric strength test O.K. 
No hazard. 

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

 

 

 

- Page 5 of 7 - 

 

 

 

Report No.  65654 

 
 
 

 

Comp. 
No. 

Location  Fault 

Test V 

Test  
time 

Fuse 
No. 

Current 
through 
fuse 

Temperature/Results 

Fan  

(Heat-sink 
installed)

 

- Locked 

253 

5 

hr 

F907, 
F903, 
F904, 
F905, 
F906 

1,79 A 

Normal operated. 
The components are heated up to: 
- Main transf. pr. winding  : 74K 
- Main transformer core  : 58K 
- Sub transf. pr. winding  : 58K 
- Sub transformer core 

: 48K 

- D991 body 

: 58K 

- PWB near D991 

: 62K 

- Q803 body 

: 58K 

- PWB near Q804 

: 56K 

- Main Heat-sink 

: 65K 

and stabilised. 
Dielectric strength test OK. 
No hazard. 

Speaker 
Terminal 

Surr. 
(

L - ch.)

 

S-c 253 10 

min 

F907 
F905 
F906 

- 

Unit shut down immediately. 
Input current stabilised at 0,01A. 
No component damaged. 
No hazard. 

Top cover 
opening 

- Blocked 

253 

5 

hr 

F907, 
F903, 
F904, 
F905, 
F906 

1,79 A 

The components are heated up to: 
- Main transf. pr. winding  : 69K 
- Main transformer core  : 57K 
- Sub transf. pr. winding  : 56K 
- Sub transformer core 

: 51K 

- D991 body 

: 70K 

- PWB near D991 

: 73K 

- Q803 body 

: 75K 

- PWB near Q804 

: 76K 

- Main Heat-sink 

: 77K 

and Unit shut down after 13 min. 
Input current stabilised at 0,013A. 
Dielectric strength test OK. 
No hazard. 

Pmax 

operating

 

- Maximu

m non-
clipped 
output 
signal 

253 39 

min 

F907, 
F903, 
F904, 
F905, 
F906 

3,80 A 

The components are heated up to: 
- Main transf. pr. Winding : 144K 
- Main transformer core  : 82K 
- D992 body 

: 81K 

- PWB near D992 

: 87K 

- Q803 body 

: 55K 

- PWB near Q804 

: 52K 

and main transf. thermal fuse 
opened after 39 min. 
Dielectric strength test OK. 
No hazard. 

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

 

 

 

- Page 6 of 7 - 

 

 

 

Report No.  65654 

 
 

Type of 

Insulation 

Position/ 
Location 

Position/ 
Location 

Working  

Voltage 

Clearance 

13.3.2 

Creepage dist. 

13.4

 

Comm. 

 1  2 

Up 

Urms

Req. 

Measu.

Req. 

Measu. 

 

Basic Live  Neutral  326V 

230V 

2,0mm 

4,0mm 2,5mm 

4,0mm 

Reinforce Primary 

Chassis 

326V  230V  4,0mm  8,0mm 5,0mm > 

8,0mm 2) 

Reinforce Primary 

C708 

*) 

379V 268V 4,0mm 7,8mm 5,6mm > 

7,8mm 

Reinforce Primary 

Chassis 

326V  230V  4,0mm  7,3mm 5,0mm > 

7,3mm 4) 

Reinforce Primary 

Chassis 

326V  230V  4,0mm  6,8mm 5,0mm 6,8mm  5) 

Reinforce Primary 

Secondary  379V 268V 4,0mm 6,0mm 5,6mm 6,0mm  6) 

 

 

 

 

 

 

 

 

 

*) 2N force applied 

Note: U in Volt, Clearances/Creepage Distances in mm, Comm. = Comment 

Comments: 

1)  Measured on PCB before mains fuse (F907). 
2)  Measured between primary pcb trace for socket-outlet and near metal chassis (back cover).
3)  Measured between socket outlet terminal and near C708 secondary E. capacitor. 
4)  Measured between main pcb primary solder pin and metal bottom chassis. 
5)  Measured on main pcb from pri. pcb trace to metal chassis connected sec. pcb trace. 
6)  Measured on main pcb from pri. pcb trace to near secondary pcb trace.