Minolta 300mm F2.8 (Older APO, not HS), Chip?? Some help please..

Started 8 months ago | Discussions thread
OP Badrmino Forum Member • Posts: 82
Re: Minolta 300mm F2.8 (Older APO, not HS), Chip?? Some help please..

SQLGuy wrote:

The chip on these is just a PROM. It allows the camera to read lens data, and the current focus distance from some encoder contacts that manipulate which values will be returned from the PROM.

A common problem with many of the Minolta AF lenses is that the solder on the flexible circuit board that connects to the mount contacts is bad. It may just need to be resoldered


Yes it seems to be the problem.

I have got great help from Neil3 and other members here and on dyxum

The agreement is that resoldering is both technically difficult and can easily go wrong.

The replacement chip, which I have ordered now, will just need a space to be made for it to be epoxied.

The method has been successfully implemented.

For future reference here is the link ;




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