Kilgoreroot
New Member
- Joined
- Jan 25, 2022
- Messages
- 8
Hi guys. I'm somewhat new at repairing these old Tandy machines and I was hoping someone might be able to help me out. I recently got a TRS-80 Model 3 with 48k of ram and two built-in disk drives. I believe the disk drives are the originals. When I first got the machine, it had quite a few issues, but with a little reading and a scope, I was able to fix most of them, and at some point, I had it booting from disk, and everything looked great, however, disk drive #1 didn't work It seemed there was an issue with the stepper motor because it made a different sound when the stepper motor was running than the working one. I took that drive out, and the stepper motor was very difficult to turn, so just as a troubleshooting step, I took out the stepper motor from the good drive and put it in the bad one. This didn't work unfortunately, so I assumed I'd just have to buy a new one. But then then when I switched the stepper motor back to its original drive, all of a sudden the drive didn't work. Now when I power up the machine with either of the drives hooked up as drive 0, the drive spins up, and the stepper motor pulls it back to its track zero position, but then that's it. No matter what I do, I can't get it to do anything after spinning up and pulling the head back to the zero track position. It's definitely not jammed up or anything, and it's for sure hitting the little track zero tracking button.
Does anyone have any troubleshooting ideas?
I ordered a couple new drives, and my plan as of right now is to just try those when they get here, but If I can, I'd like to get the original drives working.
Thanks in advance for any help you might be able to offer
Does anyone have any troubleshooting ideas?
I ordered a couple new drives, and my plan as of right now is to just try those when they get here, but If I can, I'd like to get the original drives working.
Thanks in advance for any help you might be able to offer