Hello, I have a minolta

Unless you know someone who is quite handy with equipment like this you should probably send it in for repair. Do you have a copy of the owner's manual? If you don't, I found a website that has it available as a download for a reasonable donation fee of $3. His URL is as follows:

http://www.butkus.org/chinon/minolta/minolta_spotmeter_m/minolta_spotmeter_m.htm

As for the repair you'll need to contact Sony. They have taken over support and repairs of all Konica-Minolta photographic equipment. Their URL is as follows:

http://eservice.sony.com/webrma/web/index.do