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- Page 4 of 7 - 

 

 

 

Report No.  65742 

 
 

 

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 

- 

1,16 A 

Sub transformer primary winding 
heated up to 115K and thermal fuse 
opened after 17 min. 
Dielectric strength test OK. 
No hazard. 

D617 

S-c 

253 

A - C 

18 min 

- 

1,16 A 

Sub transformer primary winding 
heated up to 114K and thermal fuse 
opened after 18 min. 
Dielectric strength test OK. 
No hazard. 

C625 

S-c 

253 

- 

17 min 

- 

0,05 A 

Unit shut down immediately. 
Sub transformer primary winding 
heated up to 116K and thermal fuse 
opened after 17 min. 
Dielectric strength test OK. 
No hazard. 

C626 

S-c 

253 

- 

2 hr 

- 

0,03 A 

Unit shut down immediately. 
Sub transformer primary winding 
heated up to 73K and stabilised. 
Dielectric strength test OK. 
No hazard. 

D607 

S-c 

253 

A - C 

1 hr 

F601 

1,44 A 

FL display off immediately. 
Input current stabilised at 1,15A. 
C619, C629, C632, D608, D609, 
Q602 damaged. 
No hazard. 

C632 

S-c 

253 

- 

30 min 

F601 

1,30 A 

FL display off immediately. 
Input current stabilised at 1,10A. 
R616 opened. 
No hazard. 

SPK 1 
terminal 

S-c 

253 

L - G 

10 min 

F601, 
F603, 
F604 

- 

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.  65742 

 
 
 

 

Comp. 
No. 

Fault Test 

V Short 

current 

Test 
time 

Fuse No Current 

through 
fuse 

Mains power/temperatures/results 

Cover 
opening 

Blocked 253 

- 

18 

min.  F601, 

F603, 
F604 

1,12 A 

The components are heated up to: 
- Main transf. pr. winding 

: 

35K 
- Sub transf. pr. winding : 31K 
- D601 body 

 

: 56K 

- PWB near D601 

: 47K 

- Q319 body 

 

: 49K 

- PWB near Q319 

: 54K 

- IC65 heat-sink  

: 48K 

and protection circuit operated. 
Input current stabilised at 0,01A. 
Dielectric strength test OK. 
No hazard. 

Pmax 
operat. 

Maximu
m non-
clipped 
output 
signal 

253 - 

19 

min. 

F601, 
F603, 
F604 

2,62 A 

The components are heated up to: 
- Main transf. pr. winding  : 136K 
- Sub transf. pr. winding  : 47K 
- D601 body 

: 85k 

- PWB near D601 

: 65K 

- Q319 body 

: 37K 

- PWB near Q319 

: 40K 

- IC65 heat-sink 

: 41K 

and main transformer’s thermal 
fuse opened after 19 min. 
Dielectric strength test OK. 
No hazard. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

- Page 6 of 7 - 

 

 

 

Report No.  65742 

 
 

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  7,0mm 5,0mm > 

7,0mm 2) 

Reinforce Primary 

Chassis 

326V  230V  4,0mm  7,0mm 5,0mm > 

7,0mm 3) 

Reinforce Primary 

Chassis 

326V  230V  4,0mm  6,0mm 5,0mm > 

6,0mm 4) 

Reinforce Primary 

Chassis 

326V  230V  4,0mm  6,7mm 5,0mm 6,7mm  5) 

Reinforce Primary 

Secondary  375V 265V 4,0mm 6,0mm 5,6mm 6,0mm  6) 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

Comments: 

1)  Measured on PCB before mains fuse (F601). 
2)  Measured between primary pcb trace for socket-outlet and near metal chassis (back cover).
3)  Measured between primary solder pin and metal bottom chassis. 
4)  Measured between primary solder pin and metal mounting guard for transformer. 
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.  65742 

 

 

 

 

Transformer Insulation 

Insulation 

Res.

Test Volt 

Clearances / Creepage distances 

Part No. 

Between 

M Ohms 

kV (60 sec.)

Measured 

Required 

KLT5U021ZE, or 

KLT5J033ZE, ...YE, or 

CLT5J033ZE, ...YE 

- 

Components / construction  
(

KLT5U021ZE or CLT5U021ZE)

 

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: 375Vp/265Vrms

 

 

Components / construction 
(

KLT5J033ZE, ...YE or 

 

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. 

KLT5U021ZE, or 

KLT5J033ZE, ...YE, or 
CLT5J033ZE, ...YE 

 
 

 

Screw 

Diameter 

With 

Without

Material 

Torque test (Nm) 

Location / function 

(mm) 

Head 

Head 

Screw

Nut 

Fulfilled / Remarks