(10-29-2018, 11:49 AM)darkhelmet02 Wrote: I will definitely try to play with termination and jumpers, I did not think about changing them, but the power supply was tested to be fine, so luckily no problems there. The problem is, nothing happens when the drive gets powered on. The spindle spins for only a moment, and nothing else happens. The read/write led does not illuminate, the laser does not try to seek, it just sits there. I suspect something on the board itself has just died, but I would much rather troubleshoot further than to completely replace the drive.
If the drive has got a 50 pin data connector then it is probably fed power through a four pin molex type connector, you can measure voltage on both the 12V and 5V rails from those pins. This would be the first thing to check, but I see you are already confident on the power supply.
My feeling is that the drive itself may be faulty, I would remove the drive from the caddy and test it on an internal scsi bus on a different computer next. These things do tend to go bad with time, you know. There are quite a few references of CD drives used by Sun in these old Ultras and Sparcstations (mostly Toshibas) behaving in a similar way to what you describe (ie, simply sitting idle and not showing up on bus probes or becoming ready). I have run into this type of issues before.
It is always worth to check termination, drive IDs, etc before ruling out possibilities. If you could confirm the drive model and maybe even post a picture showing the position of the jumpers it could be easier to troubleshoot it.
