SilverStreaks
Active member
So I was trying to align the drive head and accidentally shorted something with the tip of my hex key while trying to unscrew the bottom most bolt on the stepper motor mount. Sparks flew, the Macintosh immediately rebooted, and explicatives were uttered. I immediately switched off the machine. Despite this, to my surprise, the drive still worked, and that too perfectly! It could still initialize and read disks. I continued to fiddle around with it for maybe an hour until all of a sudden the drive stopped working properly. After turning on the machine and inserting a floppy, the disk spindle starts up for maybe a second or two and then immediately stops. The machine shows the x icon, but the disk doesn't eject. Manually ejecting and then reinserting the disk gives no response. I can switch off the machine and repeat the process and get the same results with the drive spinning up momentarily again. I should note that the drive head is still able to home itself after manually being moved forward. Not sure if the eject circuitry is still functional, but I can't test it as it seems the software doesn't issue an eject command until after the disk has been read, which is not possible due to the spindle being spun down.
I do have an external 400K drive and the system works fine with it externally. I took it apart and connected the drive internally with the yellow striped ribbon cable. The drive spins up and ejects fine, but for some reason it won't boot with it (x symbol). I'm not sure if this is normal behavior, but again it works just fine when connected externally.
I have attached some photos for reference. I have circled the all the possible contact points where the short may have occurred. One of the components on the back seems to have a dark spot on it. Not sure if it was there before, but I measure no resistance through it with a multimeter. Identical looking components return the same reading. Does anyone know what these components are? I don't believe them to be resistors due to lack of marking as well as no resistance. They're not diodes either since I can get a reading even after reversing polarity. I appreciate all the help I can get, thanks.
I do have an external 400K drive and the system works fine with it externally. I took it apart and connected the drive internally with the yellow striped ribbon cable. The drive spins up and ejects fine, but for some reason it won't boot with it (x symbol). I'm not sure if this is normal behavior, but again it works just fine when connected externally.
I have attached some photos for reference. I have circled the all the possible contact points where the short may have occurred. One of the components on the back seems to have a dark spot on it. Not sure if it was there before, but I measure no resistance through it with a multimeter. Identical looking components return the same reading. Does anyone know what these components are? I don't believe them to be resistors due to lack of marking as well as no resistance. They're not diodes either since I can get a reading even after reversing polarity. I appreciate all the help I can get, thanks.
