4. 3
Exchanging the generator PCB including the base plate
Return ultrasonic cleaners RK 1028 C and RK 1050 /CH for repair to the supplier. The following repair
instructions are not applicable for this type of units.
4. 3. 1
With original generator of older type and supply of a replacement generator
without ICs
The generator PCB with base plate is preadjusted. The complete unit can be exchanged directly.
However, deviations of the actual power input from the nominal power input stated on the type label
cannot be excluded. If there is a greater deviation, the generator has to be readjusted.
Adjustment of generator
ATTENTION! You are working with very high voltages!
You will need:
-
watt meter, corresponding to the power consumption
-
variable isolating transformer up to 250 V, corresponding to the power consumption
-
circuit diagram, see appendix 1
-
wiring diagram, see appendix 3
-
adjustment instructions, appendix 4
-
oscilloscope up to 20 MHz, modular oscilloscope probe 1:100, current probe
The generator is usually adjusted as follows:
-
Disassemble the base plate with the generator PCB completely and place it next to the tub.
-
Connect the transducers under the dry tub with the generator by means of a voltage-stable two-pole
adapter cable.
-
Replace the timer by wiring bridges.
-
Turn the variable isolating 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 slowly to approx. 150 V (115 V units: 75 V). At this value the
generator should start to oscillate. If not, switch the regulating transformer off and on again at 150 V
(115 V units: 75 V).
-
Watch the reading on the watt meter. Slowly turn the regulating transformer to 230 V (115 V units:
115 V).
If the power input deviates by more than +/- 20 % from the nominal value it can be set by carefully
adjusting the core in the swinging choke, see layout (appendix 2). Once the correct value has been
set, the adjusted core must be fixed with silicon rubber.
-
Disconnect the unit from the transformer and re-assemble.
4.3.2
With original generator of older type (G) and supply of a replacement
generator (FH1-2) with ICs
New generators FH1-2 are recognized clearly by the transistors with fixing clip and the ICs on the board,
see also point 4.2.4.
The supplied generator with base plate can compensate the equipments tolerances by its regulation.
The complete unit can be exchanged directly without a new adjustment.
Replacement parts:
1 FH1-2 generator with base plate
1 mounting kit, consisting of:
-
2 pieces
cable with flat pin bushing
(to be used with soldered mains entry)
-
2 pieces
flat pin splitter (V 002)
(to be used with units with heating)
If the new generator has to be assembled with an older equipment, connect it as follows:
9