Gummy Wheel Repair for HP-97

[Brad Barton]

John,

I had the same trepidation on my 97, but after a quite a bit of research, I went ahead and dove into it. It was not nearly as bad a job as I thought it was going to be. The 97 opens up very easily, and some of the instructions I found on line were quite detailed. I also fixed the printer feed while I was in there, and everything came out beautifully.

I took a lot of pictures as I was disassembling it, and they came in hand on the way back together. Just be sure and have a clean work area, and use a ground strap because some of the chips cannot be found anywhere. In fact I've got a spare 97 that works perfectly, but the battery went bad. I'm pretty sure that the ACT chip got blown the next time it was plugged in and it's been sitting ever since.

Don't let that discourage you though, the gummy wheel repair isn't that difficult with a bit of care.