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- Page 5 of 7 - 

 

 

 

Report No.  79765 

 

 

 

 

 

Comp. 
No. 

Location  Fault 

Test V 

Test  
time 

Fuse 
No. 

Current 
through 
fuse 

Temperature/Results 

FAN 

(built-in 
main heat 
sink - side)

 

Locked  253 

- 

3hr 

F907 

2,35 A 

Normal operated. 
The components are heated up to :
-Main transf. pr. Winging  : 104,6K
-Main transformer core 

: 80,8K 

-Sub transf. pr. Winging  : 70,4K 
-Sub transformer core 

: 65,0K 

-PWB near Q803 

: 96,9K 

-PWB near D991 

: 98,6K 

-PWB near D992 

: 77,7K 

and stabilised. 
Dielectric strength test ok. 
No hazard. 

FAN 

(built-in 
main heat 
sink – center) 

Locked 253 

- 

2hr 
45min 

F907 

2,35 A 

Unit shut down after 4 min. 
Input current stabilised at 0,018A. 
Dielectric strength test OK. 
No hazard. 

Pmax 

operating

 

- Maximu

m non-
clipped o
utput sig
nal 

253 

14 min 

F901 

5,26 A 

Main transformer primary winding 
heated-up to 141K and thermal  
fuse opened after 14 min. 
Input current stabilised at 0,018A. 
Dielectric strength test O.K. 
No hazard. 

 

 

 

 

 

 

 

 

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

 

 

 

- Page 6 of 7 - 

 

 

 

Report No.  79765 

 

 

 

 

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 

3,6mm 2,5mm 

3,6mm 

Basic Live  Neutral  326V 

230V 

2,0mm 

3,0mm 2,5mm 

3,0mm 

Reinforce Primary 

Chassis 

326V  230V  4,0mm  5,2mm 5,0mm 5,2mm  3) 

Reinforce Primary 

  Chassis 

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

Reinforce  Primary *) 

Chassis 

326V 

230V 

4,0mm 

5,6mm 5,0mm  > 5,6mm  5) 

Reinforce Primary 

Secondary  375V 265V 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 (F901). 

2) 

After F901 main fuse (6.3A) befor transformer (The part of directy connected to the mains).

3) 

Measured on main pcb from pri. trace to metal chassis connenected sec. trace. 

4) 

Measured between pri. pcb trace for socket-outlet and near metal chassis (back cover). 

5) 

Measured between primary solder pin and embossed metal chassis (bottom). 

6) 

Measured on main pcb from pri. trace to near secondary trace. 

 
 
 
 

 

 

 

- Page 7 of 7 - 

 

 

 

Report No.  79765 

 

 

 

 

 

Transformer Insulation  Insulation 

Res.

Test Volt 

Clearances / Creepage distances 

Part No. 

Between 

M Ohms 

V (60 sec.)

Measured 

Required 

, or 

, or 

- 

Components / construction  

 or CLT5W027ZE)

 

Windings on two separate bobbins. The bobbin
s are placed in an insulating housing with two  
compartments, one above the other.  
Bobbin thickness: > 0,4mm. 
Max. Working Voltage: 375Vp/265Vrms

 

 

Components / construction 
(

 or CLT5J038ZE)

 

Windings on single bobbin. The center flange  
provided between primary and secondary  
windings. Satisfactory constructed.  
Bobbin thickness: > 0,4mm. 
Max. Working voltage: 345Vp/244Vrms 

Transformer Insulation 

Thick 

(mm) 

Material 

Dielectric strength test 

Part No. 

Between 

X Number 

 

60 sec. 

 or 

 or 

 

 

Screw 

Diameter 

With 

Without

Material 

Torque test (Nm) 

Location / function 

(mm) 

Head 

Head 

Screw

Nut 

Fulfilled / Remarks 

 

 

 

- Page 7 of 7 - 

 

 

 

Report No.  79765 

 

 

 

 

 

Transformer Insulation  Insulation 

Res.

Test Volt 

Clearances / Creepage distances 

Part No. 

Between 

M Ohms 

V (60 sec.)

Measured 

Required 

, or 

, or 

- 

Components / construction  

 or CLT5W027ZE)

 

Windings on two separate bobbins. The bobbin
s are placed in an insulating housing with two  
compartments, one above the other.  
Bobbin thickness: > 0,4mm. 
Max. Working Voltage: 375Vp/265Vrms

 

 

Components / construction 
(

 or CLT5J038ZE)

 

Windings on single bobbin. The center flange  
provided between primary and secondary  
windings. Satisfactory constructed.  
Bobbin thickness: > 0,4mm. 
Max. Working voltage: 345Vp/244Vrms 

Transformer Insulation 

Thick 

(mm) 

Material 

Dielectric strength test 

Part No. 

Between 

X Number 

 

60 sec. 

 or 

 or 

 

 

Screw 

Diameter 

With 

Without

Material 

Torque test (Nm) 

Location / function 

(mm) 

Head 

Head 

Screw

Nut 

Fulfilled / Remarks