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4 Repairs 

 

4.1 

Check of transistors 

 
Check the transistors before exchanging, in order to save unnecessary costs.  
The transistors can be checked in the inserted condition: 
 

B C E 

Check of the bipolar transistors (generators without ICs): 

1)  Diode behaviour of the paths B-E, B-C and E-C: in forward direction 

approx. 300 … 500 mV voltage drop. In reverse direction no check is possible 
due to the circuitry outside the transistor. 
In some generators the inverse diode (E-C) is situated at the board and can 
not be checked at the desoldered transistor.  

 
Check of IGBTs 

(

generators 

with ICs)

G C E 

1)  Diode behaviour of the path E-C: in forward direction 

approx. 300 … 500 mV voltage drop.  

2)  The path G-E is “high impedance”, but to parallel circuitry it 

takes some seconds to obtain a voltage > 1 V.  
The voltage drop indicated depends on the instrument and is 
different for the two IGBTs due to different circuitry.  

 
 

4. 2  Exchange of transistors 

 
4. 2. 1  Transistors in insulated case (Isowatt 218) 
 
The transistors (for example BUV 48 AFI/IV48A (Isowatt 218)) are mounted on the base plate. 
They can be exchanged as follows: 

Loosen the self locking nut M3 on the transistor. 

Cut off the transistor connections just below the transistor using side cutting  pliers. 

-  

The transistor is attached to the base plate by means of heat conducting paste, remove defective 

 

transistor using a knife blade or similar. 

-  

Desolder the transistor connections. 

-  

Tighten the new transistor with self locking nut. 

-  

Solder the connections to PCB. 

 
 

 

                                                                                                                       

 6 

 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

self locking nut and disc

 

base plate 
heat conducting paste  
disc 3,2 
 
hexagon socket head cap screw  
DIN 912 M 3 × 12 
 
transistor Isowatt 218 BUV 48 AFI/I V 48 A

 

 

 

Summary of Contents for Sonorex Super RK 31

Page 1: ...RK 103 CH RK 103 H RK 103 CH RK 106 RK 106 RK 156 RK 156 BH RK 156 RK 156 BH RK 158 S RK 170 RK 170 H RK 255 RK 255 H RK 255 CH RK 255 RK 255 H RK 255 CH RK 510 RK 510 H RK 510 RK 510 H RK 512 H RK 5...

Page 2: ...he oscillating tub from the housing 12 4 4 2 1 Disassembly of screwed drain 12 4 4 2 2 Disassembly of welded drain 12 4 4 3 Exchanging a defective heating 13 4 4 4 Exchanging the thermostat of dry run...

Page 3: ...should occur after a longer period the following hints support the user to repair the unit 1 Overview of possible faults causes and remedies Faults Possible causes Tests and Remedies Unit cannot be sw...

Page 4: ...dirt renew cleaning liquid see also operating instructions Cleaning caring of unit If necessary replace oscillating system see item 4 5 or return unit for repair to the supplier Surface of oscillating...

Page 5: ...31 H RK 52 H CH RK 100 H SH TK 100 H RK 102H CH RK 103H CH RK 156 BH RK 158S RK 170 H RK 255H CH RK 510 H RK 512H CH RK 513 RK 514 H BH RK 515 CH RK 517H RK 1028 H BH C CH RK 1029 H RK 1040 RK 1050 BH...

Page 6: ...cuitry it takes some seconds to obtain a voltage 1 V The voltage drop indicated depends on the instrument and is different for the two IGBTs due to different circuitry 4 2 Exchange of transistors 4 2...

Page 7: ...ste on both sides countersack screw PCB Base plate 4 2 3 Transistors in metal case TO 3 Use matched pairs only Exchange the transistor as follows fig 3 Unsolder all connecting leads from one transisto...

Page 8: ...the board upside down lifting the side with the transformer HF terminals and transistors over the opposite side containing the mains fuse and the current shunt Care for the cooling plate which must no...

Page 9: ...transformer to zero Connect the generator to the regulating transformer using a two pole mains cable Fill the tub 2 3 with lukewarm water Add a splash of detergent Adjust the regulating transformer s...

Page 10: ...pment without heating X 1 X 2 X 8 X 9 X 3 X 5 X 4 Generatorplatine FH1 2 HF line to the oscillating systems to the timer mains plug or mains cable PE at the base plate PE Attention Take care of effect...

Page 11: ...102 CH 140 378 10 140 94 5 10 RK 52 CH TK 100 H 100 529 10 70 189 10 RK 103 H RK 103 CH 200 265 10 200 66 25 10 RK 156 BH 600 88 10 600 22 10 RK 170 H 1600 33 10 RK 255 H RK 255 CH 280 189 10 280 47 2...

Page 12: ...ace spanner on locking nut 9 Remove nuts 3 and 5 so that the threaded pipe can be removed Unscrew the heated bended pipe 2 with a pipe wrench from the screw neck on the tub 1 The assembly of the drain...

Page 13: ...m layer and on the perforated mounting plate completely cover the bonded section of the plate Do not completely paste the edges of the heating elements but leave 1 cm blank on the long sides to avoid...

Page 14: ...s Connect the pins again in the right order IMPORTANT Do not damage the thermostatic sensor or the capillary tube 4 4 7 Assembly of oscillating tub and housing Fill the cleaned tub edge with compound...

Page 15: ...rmostat of dry run protector E 41 931 35 W 100 W 140 W 200 W 325 W 71 C 118 C Tube Tube Cardige RK 31 H 2 1 1 1 RK 52 H 100 H 100 SH 102 H 1 1 a 1 b 1 1 RK 52 CH 1 1 1 1 TK 100 H 1 1 80 1 1 RK 102 CH...

Page 16: ...get an electric shock Remove transducer wires Hold the steel bush with pin spanner remove hexagon socket screw Remove all parts Attention Cu Be discs to be disposed as special waste 4 5 2 Assembly of...

Page 17: ...es 1 TS 0190 1 TS 0153 to be used according to the existing oscillating system spring washer DIN 127 B 4 steel bush PZT ring marking facing down Cu Be disc TS 0152 LM thread facing up PZT Ring marking...

Page 18: ...ing Cu Be disc TS 0152 LM thread facing up PZT ring marking facing up Cu Be disc TS 0152 LM thread facing up insulating bush TS 0190 cone hexagon socket head screw squarehead screw RK 538 M 4 8 solder...

Page 19: ...uare nut threaded bolt at older units housing timer with metal angle not present at all timers seal at older units steel screws or M3 screws felt washer Notes The wiring diagram is a part of the mount...

Page 20: ...can be damaged 5 Re starting the unit After repair assemble the unit in reverse order as described in item 3 IMPORTANT Make sure that all plug connections have been made correctly for details see wiri...

Page 21: ...A TK 100 H 0 7 A 1 3 A RK 1028 H 7 0 A 14 0 A RK 103 H 1 5 A 3 0 A RK 1028 BH 7 0 A 14 0 A RK 103 CH 1 6 A 3 2 A RK 1028 C 2 2 A 4 4 A RK 106 0 6 A 1 1 A RK 1028 CH 7 0 A 14 0 A RK 156 0 6 A 1 1 A RK...

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