could you try the drive in a external enclosure?just for giggles?

it might be a power issue acutely, maybe the HD is getting almost enough power from the PSU, but not quite enough once the head starts seeking?

Click to expand...

I already tried an external enclosure: it's not working, same reslt: tried 3x 100% known good drives.

The PSU is not the issue as well as both PSU and Analog board are fully recapped as well.

PSU is stable, no drops or spikes in voltage as I logged both the +5v and +12v lines while testing.

Could it still be the bourns filter ? I don't think so because I measure 54 Ohms in-circuit between the pins, identical on all 3x Bourns filters.

I guess this is the right way to test them: correct me if I'm wrong.

I get +5v termination voltage on the SCSI connector, verified all traces from the SCSI Chip to the SCSI Connector, UL

I used this diagram to check all traces from the SCSI chip ( it was posted a while ago in another SE/30 Scsi topic ) :




I don't know anymore now. It's weird the SCSI chip can still see the HDD on the Bus, succeeds in format and verify but then TEST and Mount fail.

Anyone with ideas as it would be a sad to give up on this board.