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- Page 4 of 7 - 

 

 

 

Report No.  65586 

 
 

 

Comp. 
No. 

Location  Fault 

Test V 

Test  
time 

Fuse 
No. 

Current 
through 
fuse 

Temperature/Results 

C807 -  S-c 253 20 

min 

F907 
F905 
F906 

1,79 A 

Surround L channel signal output 
distorted immediately. 
Input current stabilised at 1,33A. 
R611, 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. 
Q803, Q804 shorted and 
R810 opened. No hazard. 

Q804 

B - C 

S-c 

253 

10 min 

F907 
F905 
F906 

- 

Unit shut down immediately. 
Input current stabilised at 0,01A. 
Q803 shorted.  No hazard. 

C813 -  S-c 253 20 

min 

F907 
F905 
F906 

1,29 A 

Surround L channel signal output 
off immediately. 
Input current stabilised at 1,26A. 
No component damaged. 
No hazard. 

D962 

A - C 

S-c 

253 

12 min 

- 

1,47 A 

Sub transformer primary winding 
heated-up to 106K and thermal 
fuse 
opened after 12 min. 
Dielectric strength test O.K. 
No hazard. 

C906 

- 

S-c 

253 

11 min 

- 

0,04 A 

Mains relay off immediately. 
Sub transformer primary winding 
heated-up to 110K and thermal 
fuse 
opened after 11 min. 
Dielectric strength test O.K. 
No hazard. 

C911 

- 

S-c 

253 

2 hr 

- 

0,02 A 

Mains relay off immediately. 
Sub transformer primary winding 
heated-up to 87K and stabilised. 
Dielectric strength test O.K. 
No hazard. 

Speaker 
Terminal 

Surroun
d 
(

L - ch.)

 

S-c 

253 

10 min 

F907 

- 

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

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

 

 

 

- Page 5 of 7 - 

 

 

 

Report No.  65586 

 
 
 

 

Comp. 
No. 

Location  Fault 

Test V 

Test  
time 

Fuse 
No. 

Current 
through 
fuse 

Temperature/Results 

Top cover 
opening 

- 

Blocked  253 

10 min 

F907 

1,45 A 

Unit shut down after 6 min. 
Input current stabilised at 0,01A. 
No component damaged. 
No hazard. 

Pmax 

operating

 

- 

Maximu
m non-
clipped 
output 
signal 

253 

24 min 

F907 

3,05 A 

The components are heated up to: 
- Main transf. pr. Winding : 147K 
- Main transformer core  : 89K 
- D992 body 

: 93K 

- PWB near D992 

: 94K 

- Q803 body 

: 52K 

- PWB near Q804 

: 44K 

and main transformer’s thermal 
fuse opened after 24 min. 
Dielectric strength test OK. 
No hazard. 

 

 

 

 

 

 

 

 

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

 

 

 

 

- Page 6 of 7 - 

 

 

 

Report No.  65586 

 
 

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 

*) 

377V 266V 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  377V 266V 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. 
 
 

 

 

 

 

- Page 7 of 7 - 

 

 

 

Report No.  65586 

 

 

 

 

Transformer Insulation  Insulation 

Res.

Test Volt 

Clearances / Creepage distances 

Part No. 

Between 

M Ohms 

kV (60 sec.)

Measured 

Required 

KLT5V037YE, or 

KLT5J033YE, or 

- 

Components / construction  
(

KLT5V037YE or CLT5V037YE)

 

Windings on two separate bobbins. The 
bobbins are placed in an insulating housing with 
two compartments, one above the other.  
Bobbin thickness: > 0,4mm. 
Max. Working voltage: 377Vp/266Vrms

 

 

Components / construction 
(

KLT5J033YE or CLT5J033YE)

 

Windings on single bobbin. The center flange  
provided between primary and secondary  
windings. Satisfactory constructed.  
Bobbin thickness: > 0,4mm. 
Max. Working voltage: 344Vp/243Vrms 

Transformer Insulation 

Thick 

(mm) 

Material 

Dielectric strength test 

Part No. 

Between 

X Number 

 

60 sec. 

KLT5V037YE, or  Pr - sec 

KLT5J033YE, or 
CLT5J033YE 

 
 

 

Screw 

Diameter 

With 

Without

Material 

Torque test (Nm) 

Location / function 

(mm) 

Head 

Head 

Screw

Nut 

Fulfilled / Remarks