Before the electronics is assembled, it is worth examining the print for bad solder joints. In order not to disassembled the electronics a second time I also checked the 3 power transistors for short circuit or interruption. As a rule, however, the semiconductors are actually no problem and it is very rare that one of the transistors breaks down.

After installing the electronics I dedicate myself to the top of the device. After all these years, some residues have settled on the Pulley. It should be dismantled for cleaning, as dust has accumulated underneath.