Thanks for the quick response gr5!
Answering in English is no problem at all. I've opened the controller housing and looked for a potentiometer, but I am not sure which the potentiometer is. Maybe somebody can point it out to me.
I've also checked the ribbon cable connectors, they are all in perfect state.
Front
Back
When I switch the printer on, the display looks like this.
When I press the black round button a couple of times the displays shows more pixels.
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gr5 2,271
I hope you don't mind me answering in english. I had the same issue and I opened up the controller housing (removed all the screws that hold the wood together around the controller.
There is a potentiometer in there. Use a tiny screw driver to turn that many turns. Try both CW and CCW. I think it's a 10 turn potentiometer (can rotate 10 times).
If that doesn't work, remove the ribbon cable connectors and check for bent pins and reconnect carefully. Don't lose track of the orientation of the ribbon cables. Do this on both ends of the cables.
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