After getting the #Commodore#C64 and #C128 running again, the next device to repair is the #C1571.
It had #corrosion and #rust on the main board and the power supply is beyond repairworthiness. I'd replace the latter with a #meanwell RD-35 with 5 and 12 volt output.
One #diode was rusty, a few traces needed #cleaning and five #resistor looked bad. Hope the black hybrid chip is still okay.
Sadly, the lower read head seems to be broken, my work might've been in vain. #floppydrive#retrocomputer
The DC rails on this failed switching power supply from a wall wort AC adapter, were shorted together. It could be one of 4 components: 2 electrolytic capacitors, a surfacemount ceramic capacitor, or a surfacemount Schottky diode. Started desoldering each one and testing for the short. It cleared when the Schottky diode (SK26) was removed
The voltages on this side of the switch mode power supply are not expected to be much higher than 12V DC. This wall wort is rated at 600mA 7.2VA. The electrolytic caps are only rated up to 16V
This is why #AM#radio is worth keeping - I tuned into #RadioCaroline using an 18m wire antenna run around the outside of the building, a 330 uH inductor and a military surplus CV7130 (OA91) germanium #diode (I had to order these from a place near Brighton selling NOS vintage components, diodes sold on Amazon as "Germanium" didn't work). The output of the detector diode is fed into the line in of a desktop PC (the metal case of which also provide the earth for the receiver)