If "it doesn't do much more than smoke when it is turned on...", that sounds like a problem with the motor, which may have seized up due to the grease drying out.

The following sites may be of help:

https://www.vintage-radio.net/forum/...d.php?t=171732

https://www.radiomuseum.org/r/collaro_microgram.html


https://www.vinylengine.com/library/...icrogram.shtml


You will most certainly have to replace the cartridge. The best suggestion is to replace it with a crystal device featuring a 'flip over' stylus.

Good luck!