Milli V Posted July 12, 2016 Share Posted July 12, 2016 I am stumped. I have a drive I am refurbing - It was very dirty inside and out - I have stripped it down almost completely and cleaned all connectors and parts, cleaned the drive head many times and yet when I do a directory on a known good disk in CPM the head seeks to the right track and then just goes back and forth- eventually giving me a missing block error (also happens when I format a disk or copy to a disk). I tried aligning the head and it made no difference. I have swapped the mech to a known good drive and the issue followed it so it is not the adam controller board (though could be the read write head controller board, I didn't swap that- yet). Anyone have any clues? https://www.youtube.com/watch?v=zxtHJWot1xc&feature=youtu.be Quote Link to comment Share on other sites More sharing options...
NIAD Posted July 12, 2016 Share Posted July 12, 2016 I was about to say to adjust the variable capacitor in small increments on the left side/middle of the bottom controller board while loading Disk Manager (the program included with the disk drive), but it sounds like you did this already. I would suggest sending Geoff Oltmans a PM on here to see if he can point you in the right direction. Quote Link to comment Share on other sites More sharing options...
Milli V Posted July 12, 2016 Author Share Posted July 12, 2016 I tried the brute force adjustment - move the stepper motor I'll give this a try Quote Link to comment Share on other sites More sharing options...
Milli V Posted July 12, 2016 Author Share Posted July 12, 2016 Bottom controller board? Not The one on the drive? Quote Link to comment Share on other sites More sharing options...
adamcon Posted July 12, 2016 Share Posted July 12, 2016 Bottom controller board? Not The one on the drive? Yes, there are actually 3 small adjustable capacitors on the bottom controller board. Appears that onnly the one may be out of whack?????? Quote Link to comment Share on other sites More sharing options...
NIAD Posted July 12, 2016 Share Posted July 12, 2016 Yes, the bottom controller board that was made by Coleco. I posted a thread years ago on here with pics and details... think it was called "Adam Maintenance". Also, in the NIAD newsletters, there are a large number of articles throughout the years that deal with repairs and maintenance. Quote Link to comment Share on other sites More sharing options...
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