I'm eventually suspecting this also .... they are 2 big copper leafs, one under HDD's PCB, and one under DOS board ... one side of each leaf, touching the PCB is isolated, but none appears to be grounded on any point. As I also had to extend fixations of SASI board, may be did I missed something on chassis grounding for this board ... Does anyone have an idea on this perticular point ? I had the same symptoms with the other,nearly identical, ST225; may be are they more sensible ? In all cases, this does not explain why RF interference could be present in 1 position and absent when the entire system is rotated 90° clockwise Tous vos emails en 1 clic avec l'application SFR Mail sur iPhone et Android - En savoir plus. ======================================== Message du : 27/01/2014 19:14 De : "William Levak " <wlevak@SDF.ORG> A : email@example.com Copie à : Sujet : Re: D9090 back to life ! On Mon, 27 Jan 2014, firstname.lastname@example.org wrote: > Don't ask why, it operates well only when placed on it's right side ! (seen from ST225 manual, it's forbiden to use it from it's back .. and it's the exact position choosen by commodore) If it's not the bearings or the head stepper mechanism, it could be rf interference between the drive controller board and the main controller board. I've seen some IBM drives that would only work in certain positions because of rf interference. Try unmounting the drive and moving it as far away from the rest of the unit as possible. If it works that way, it's rf interference. Try adding a ground strap between the two boards. email@example.com SDF Public Access UNIX System - http://sdf.lonestar.org Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2014-01-27 23:00:03
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