La San Marco 85-E-3 Button Repair Parts
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Button repair parts for the La San Marco 85-E-3 espresso machine, using KS-9 keyboard switches and printed keycaps.
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These are the 3D-printed parts I used to repair the buttons on my La San Marco 85-E-3 espresso machine. They replace the broken tactile switches with KS-9 mechanical keyboard switches and printed keycaps.
The new switches use JST-XH crimp terminals and can be removed and reused. No soldering is needed at the new switch pins, but the wires must be soldered to the circuit board.
Installation and wiring
Disconnect the machine from power and remove the button board.
Remove the old holder and broken switches.
Solder two wires to the board pads shown in the photo.
Crimp JST-XH terminals onto the other ends. Connect one terminal to each pin of the new switch.
The exposed pin and terminal connections underneath MUST be insulated so they cannot touch the machine’s metal body.
After connecting the buttons, check all connections with a multimeter to make sure everything is connected correctly. Keep the power disconnected during this test.
The keycaps in the photos were sanded and coated with resin after printing. This step is optional.
If you need buttons like these for another project, you can use my customizable holder for mechanical keyboard switches. Choose from 1 to 10 buttons in one row, then download and print the holder.