Hello everyone,

I am restoring a defective MACAP/ELEKTRA bean grinder, probably type MXP. I could not find anything on the net about wiring diagrams and/or PCBs. Also no replacement parts, at least not for the generation of grinder that I have.

I have the idea that there cannot be much that is defective. After all, it is a relatively simple circuit, at least that is what I thought….

On the circuit board I saw that capacitor C2 is probably missing. I am not a dummy, but determining what value the capacitor should have is too much for me. In the photos several components seem to be missing, but judging by the soldering a component has never been in there.

The wiring diagram:
1+2 are connected with a microswitch. When the ignition is on, they are connected to each other.

2+4 concerns input power supply 220V
5+6 start capacitor/motor (25uF)

I have already replaced the fuse.

Who can help me determine the capacity of the missing capacitor?

 

Certainly capacitor C2 has been broken off It was a polarized capacitor with an unknown value and voltage rating. Do we have any information about the supply voltage for that circuit board?

 

Certainly capacitor C2 has been broken off It was a polarized capacitor with an unknown value and voltage rating. Do we have any information about the supply voltage for that circuit board?

Supply voltage is 220V Europe, Netherlands)

 

OK, and for half-wave rectified 220 volts a reasonable voltage rating for a filter capacitor will be 400volts. That allows a safe margin, along with being a common value. Next, the capacitor value range will probably be determined by the spacing of the two leads. That will define the diameter of the capacitor to some extent.
Tracing out enough of the circuit to understand what the capacitor was for will also help understand what value it should have.

 

OK, and for half-wave rectified 220 volts a reasonable voltage rating for a filter capacitor will be 400volts. That allows a safe margin, along with being a common value. Next, the capacitor value range will probably be determined by the spacing of the two leads. That will define the diameter of the capacitor to some extent.
Tracing out enough of the circuit to understand what the capacitor was for will also help understand what value it should have.

Thank you! I figured out that the missing part is a smoothingcapacitor. Diameter on pcb is 9,1mm (0.362 inch). Spacing between leads is 3,5mm (0.138 inch)

Suggestion on other forum was to try an 25uF 16v??

Suggestions? Comments?

 

Hi,

Have you tried the Coffee Forum?
Good luck.........

 

IF you are able to power that circuit board and measure the voltage between those two connections that would provide the information that is needed. Otherwise, tracing out a bit of the circuit will be required.

 

IF you are able to power that circuit board and measure the voltage between those two connections that would provide the information that is needed. Otherwise, tracing out a bit of the circuit will be required.

fixed the board: placed a 330uF/ 50V capacitor.

thanx for all help

 

fixed the board: placed a 330uF/ 50V capacitor.

thanx for all help

OK, that is good news. My question now is what lead to that selection for capacitance and voltage rating???