Chuck(G)
25k Member
You're going to sell a drive with a bad PCB? Why not keep it for spare parts?
You're going to sell a drive with a bad PCB? Why not keep it for spare parts?
to align the track zero switch to spec you do need an alignment disk. same for head radial. with a known good diskette you can wing it, but with blank disks you can't since there's no format on them.
if you aren't interested in interchanging a diskette between drives, then it doesn't matter so much since your drive should be able to read what it wrote assuming everything else is working. the alignment diskette was used to make sure that what you wrote in one drive could be read in another drive, or when you wrote on a diskette from another drive you didn't damage the data on it because the head was not exactly where it should be.
look in your z-100 manual to see whether it needs hard or soft sectoring and then make sure the appropriate dip switch on the drive is set accordingly. check the other dip switches to make sure they're set properly for you computer.
just because you have NOS diskettes doesn't mean they're going to work anymore, or if they do that' they'll work for long. FYI.
when you complete your power supply rebuild hang a scope probe on the output/s and make sure that the DC is clean. there should be a spec in the CDC manual for the voltages.. e.g., +/- 10% or like that.
good luck with your project!
it’s not all that important unless you want to have drive interchangeability with diskettes
Could you tell me where you found the drive belt?
I have two CDC drives both in need of belts.
I replaced the belt on the one CDC 8" floppy drive in my HP 9895A successfully with a reversed toothed drive belt. I ordered them from Stock Drive Products (SDP/SI), the part number is A 6B16-265012, a .080" (MXL) Pitch, 265 Teeth, 1/8" Wide Single Sided Urethane Belt with Kevlar Cords. I had to enlarge the motor mounting holes to allow the spindle motor to slide backwards a bit to provide the correct tension for the belt. The next smaller belt (A 6B16-260012) would require the motor to be adjusted in the opposite direction.