Repair Advices; Disassembly Of Unit - BANDELIN SONOREX RK 31 Service Instructions Manual

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Repair advices

Repairs must only be carried out by authorised personnel.
Replace defective parts with SONOREX original parts only.
It is recommended to limit the repair of the units to the exchange of fuses, transistors, generator
PCB with base plate, the heater, transducers (without new bonding), as well as the timer. The parts
mentioned are supplied as replacement parts.
Information about electric components, connectors, cables, fuses can be found in the unit specific
enclosures.
In the case of measurements and adjustments, the oscillating systems must be connected with the
generator. Use an extension cable for this and take care that the blue lead is well insulated
→ high frequency voltage of ≈ 500 V
In some devices the red transducer line is connected to protective ground and/or with the tank.
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Disassembly of unit

ATTENTION! Before opening the unit, pull the mains plug!
- Place the unit upside down.
- Carefully remove the base plate:
• for units RK 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/CH remove
screws from the base plate along the rim of the housing only.
• RK 106 unscrew 3 screws. Either the screws in the feet or the screws from the base plate
along the rim of the housing.
Note: Do not loosen the tank from the housing.
In case of defective tank or loosen adhering (of the oscillating systems) return unit for
repair to the supplier.
- Electrical plug connections between the base plate with generator PCB and case with oscillating
tub must be separated if necessary in accordance with the wiring diagram in appendix 3.
•
Remove the connectors from the timer (2 yellow and 1 brown + 1 blue wire in a silicon hose)
•
Remove both plugs for the heating (red wires), if necessary desolder power supply wire.
•
Remove both plugs for the HF wires to the oscillating elements (one blue and one red wire in
a silicon hose).
- Exchange of fuses:
.
rms
- The fuses are located on the generator.
- Check fuses and replace only defective ones.
- Spare fuses are on the base plate.
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