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SD usually means SanDisk and is usually a storage device,
you can use it for firmware, updating java, media library etc... usually the card is labeled if it has proprietary software already loaded...

I would check the bias connection,and if you have serious overtoning in the dev unit above the h-cut your developer could be spent.

Try replacing the memory.

Konica color boxes as a whole, 7728 9028. This is why it's Konica Minolta now, Konica could make a reliable color copier.

I personally lightly resurface the shaft where the one way rides and replace the one way bearing. If the outside diameter of the shaft is worn down I replace then shaft as well.

Thank you

New to the forum, just wanted to say hi.