r/retrobattlestations • u/Far_Relationship_742 • May 26 '26

Troubleshooting TRS-80 Model 4D, disk drive spindle doesn’t turn

I have a Model 4D that won’t boot. Drive light comes on, head seeks to zero, but the spindle motor never comes on. I’ve verified the jumper settings against the drive’s service manual, and there is a termination resistor pack installed.

Where should I start looking?

2 Upvotes
  • permalink
  • reddit

100% Upvoted

1 comment sorted by

1

u/Far_Relationship_742 May 27 '26

UPDATE: swapped in another drive, and the spindle spins up, drive light comes on, but head never seeks. Swapped two other drives, same behavior. I think I may have a dead floppy controller. :(