Hi Chris, Den lör 2 jan. 2021 kl 14:03 skrev Chris Zach via cctalk < cctalk@classiccmp.org>:
> I am dealing with this a *lot* with all these disks from Bob's basement. > The problems seem to be three categories: > > 1) Disk does not spin up at all. So far it's all been sticking motors, > they don't have a lot of start up torque at all. For the first 4 disks > (ST412, Quantum 30mb, and two ST506) I was able to remove the bottom > board, turn the disks manually (clockwise) while applying power to spin > them up. The motor will start to turn, then as you continue to spin it > with your finger it will go faster as the oils distribute themselves. > > Note: I need to figure out how/if I can oil drive motor bearings without > opening them or ruining the seal. > > 2) Stepper/coil motors are stuck. This is easier to deal with on the > ST412,Quantum,ST506 drives as there is literally an arm on the side you > can move. These can be oiled externally if needed. > > On the RD53, the heads were stuck internally, what I did was unlock the > heads manually (open bottom panel and turn the locking cam) while > tapping the drive on the side with the palm of my hand. This could work, > but hit it too hard or sharp and you will crash the heads. Maybe I could > use the rubber hammer. > Thanks, I will take the drive apart a bit and see if I can find something that can be unlocked. > 3) Controller board caught fire and exploded. Yes, this burned my rug > with flying debris, it can happen. Have a fire extinguisher handy. > > I am thinking of building a small dust free space to open the tops of > other drives. Not sure if this is an immediate death sentence, a lot of > these drives have filters inside that could probably handle one or two > openings worth of dust, but man that is an edge case. In the old days I > built a tent over my RM03 disk and counted on its absolute air filter, > but I don't think I can do that with RL02's as the fan for the absolute > air is also the disk spindle motor.... > > Then again the Diablo 44 is always running the fan but I haven't found a > source of air filters for that yet (unlike the RL02). > Actually I am not counting on this drive to live forever. I just want to make an image of it and then probably replace it with something more reliable. Like an mfm emulator. /Mattis > > > Hm. > > CZ > > > > On 1/2/2021 3:59 AM, Mattis Lind via cctalk wrote: > > I have a nice ICL PERQ 2 T2 that I am going to start working with now. > > > > First thing was to try to image the hard drive. It is a Micropolis 1303. > It > > spins up but when it reaches what I think the correct speed it > immediately > > spins down. Usually I think there would be a click and then the heads > would > > recalibrate. But there is no click and no head movement. > > > > I really would like to make an image of the drive. What are your > thoughts? > > Are the heads sticking? > > Some kind of solenoid that is not releasing the heads? Not properly up to > > speed? (but it sounds like the speed is right) > > > > /Mattis > > >