|Re: 82176A Mini Data Cassette equivalent?|
Message #12 Posted by Dan Grelinger on 20 Mar 2009, 10:25 a.m.,
in response to message #11 by Steve (Australia)
I completed a repair of a faulty 82176A cassette on Wednesday night. The felt pad had fallen off, and the tape would not read. I would alternately get "Medm Error" or "Dev Error" before the repair.
Tony Duell graciously sent me his 82176A repair article from years past, and I used that as a basis for the repair.
I got the case apart, although it would not cleanly split along the seams; the separation departed from the seam on the side of the cassette opposite the tape head. I used a blade to try and split the seams, and realized that the full tape spool was dangerously close to the cassette edge. I may have nicked the clear tape leader that was wound on the outside of the spool when trying to open the tape, but I could not see any damage when I unspooled the leader.
I still had the felt pad, and I scraped the backside with a blade to remove most of the remants of the deteriorated foam, so that I could re-use it. I could not find the foam double stick tape that Tony recommended, but I did find its specifications, and it is 1 mm thick. I had some 3M permanent double stick tape that was 1 mm in thickness, so I used that and stuck the original felt pad to it.
I tried isopropyl to clean the metal spring strip, and had to scrap it with a blade to get it clean.
Once the pad was replaced, and I got the tape back together, it read fine.
I am going to try to repair another one, but this time I am going to try and do it without opening up the tape case.
Does anyone know the thickness of the tape? From what I've read about standard cassettes, the 45 minute and 60 minute tapes are the same thickness, the 90 minute tapes are thinner, and the 120 minute tapes are even a ittle thinner than that. I would like to replace the tape in one of my mini-cassettes to maximize its future life, and tape thickness will be important to match.