DutchMaker
Member
I received an IBM 5155 this week from its first owner.
He bought it in 1985, used it for a couple of years and then stored it neatly in its carrying bag.
The floppy drive needed a couple of drops of lubricant and then sprung back to live.
Using a floppy, it boots succesfully into DOS 3.2
The machine has a hard drive on board. It's a Rodime RO252 (ST-506/412 interface, see pictures).
It looks to be in very good shape, but it's currently not working.
The symptoms / things tried are:
Also, I think the drive should start spinning when it's powered up? Because then I'd have to look at that first before probing the controller lines. Or is that just supposed to happen when drive select is active?
He bought it in 1985, used it for a couple of years and then stored it neatly in its carrying bag.
The floppy drive needed a couple of drops of lubricant and then sprung back to live.
Using a floppy, it boots succesfully into DOS 3.2
The machine has a hard drive on board. It's a Rodime RO252 (ST-506/412 interface, see pictures).
It looks to be in very good shape, but it's currently not working.
The symptoms / things tried are:
- When booting, the IBM returns a 1701 error code.
- I tried to run FDISK after booting from floppy, but that just returns "no fixed drive present".
- The power LED on the HDD is on (always on, not blinking or anything, so it's not giving an error code) and the drive select LED is always off.
- Verified that the drive select LED works.
- The drive is not spinning at all.
- The head is not moving at all.
- Stepper for the head moves freely when powered off (also applied some lubricant from the back).
- Spindle motor also moves freely when powered off. Can't really lubricate it unfortunately, not without taking the drive further apart.
- The spindle motor (which I think is also a stepper) also gets power when the drive is on.
- I tested both motors by applying a bit of voltage to two of the lines and it does move. I did this with the logic board removed.
- Voltages entering the drive logic board are verified (12v and 5v).
- Continuity on both controller and data cable is good.
- Did a visual check on the logic board and everything looks in great shape.
- Also did a visual check on the hard drive controller board (Xebec, ass 104866) which also looks good.
- Took out the ROM chips from the hard drive controller to see if I could dump them, which worked fine.
- I didn't really dive into configuration (like jumper settings, cable type) because this machine worked when it was stored by its only owner who has never opened it.
Also, I think the drive should start spinning when it's powered up? Because then I'd have to look at that first before probing the controller lines. Or is that just supposed to happen when drive select is active?