68kMLA Classic Interface

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Apple 20SC problem
Posted by: Tagman on 2021-01-02 15:46:19 My Apple 20SC external hard Drive just started acting up. It had been working fine but now is acting weird. I hadn't used it in a while but just recently recapped my Mac Plus I used the Hard Drive yesterday but today when the activity light is showing solid red after powered up? I have the Mac in the top port and the SCSI terminator in the bottom port as I always have. The drive spins up but there's no activity. If I launch the SCSI utility (6.0.8) it does not see the 20SC, however if I remove the terminator it does recognize the drive, but I can't format it or test it as I would expect without a terminator. I did check the voltage on the 20SC PSU and get ~5volts on the yellow wire and ~10+ volts on the 12v wire (without any load). The Caps all look pretty good. I also cleaned all the contacts on the cables, terminator, etc.. Could the terminator have gone bad?? I've never experienced that before, but if I power up the drive without the terminator the status light doesn't stay solid and as I said the SCSI utility recognized the drive ONLY with the terminator removed Stumped.... I do have a new terminator coming from E-bay. Also, if I do replace the drive with a 3.5" drive what's the best way to mount it in the case? Thanks!!!
Posted by: NJRoadfan on 2021-01-02 15:56:05 There is a bracket that the 5.25" drive is bolted to that can be removed. It should have mounting holes for a 3.5" drive.
Posted by: desertrout on 2021-01-07 15:04:08 The Caps all look pretty good. Caps can look fine but be dried out, it may be worth recapping and see if it resolves the issue.
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