I unplugged the drive I was testing and the same. I’ll unplug everything and test.What @Unknown_K says. Was the drive a manual inject 1.4MB drive, perchance? Tried subsituting the manual inject floppy that's currently in my Centris 650 into my Plus, so I could see if I could get the computer to boot a floppy. Drive draws too much power. No chime, flupping sound from the analog board. Flipped the switch off, unplugged the drive, turned the switch back on. Chime and video. Connected the original drive with its stripped eject gear. Turned it on. Chime, video, then a very angry eject motor.
You don’t think it’s the fly back?I would say you have a short somewhere. Remove the drive you were testing and see if that was it, look for a dropper screw, broken solder joints, shorted diodes etc.
Hmmm, ok. It's possible that you might've overloaded some circuitry on the analog board and something failed. Usually, if the flyback transformer dies, the computer will still boot, it just won't show anything on the monitor.I unplugged the drive I was testing and the same. I’ll unplug everything and test.
Okay would that something be a cap?Hmmm, ok. It's possible that you might've overloaded some circuitry on the analog board and something failed. Usually, if the flyback transformer dies, the computer will still boot, it just won't show anything on the monitor.
It was okay and then cut out and never came back.Did it cut out instantly after turning it on or was it working okay for a little while then started having issues?
It was okay and then cut out and never came back.
Im learning how to work on these the hard way.Because something went hard short. its going to be one of two things. Either the horizontal output transistor shorted due to the flyback, or, one of the secondary rectifier diodes on the output of the power supply went hard short.
Do you happen to know the location if these? This is all pretty new to me and I learning the hard way. :/Because something went hard short. its going to be one of two things. Either the horizontal output transistor shorted due to the flyback, or, one of the secondary rectifier diodes on the output of the power supply went hard short.
And what’s a hard short?Im learning how to work on these the hard way.
Do you happen to know the location if these? This is all pretty new to me and I learning the hard way. :/
And what’s a hard short?
Roger that. Most of what I know, albeit limited, I learned in the rabbit hole.Might be time to travel down the youtube rabbit hole and watch some videos of others working on/teaching how to troubleshoot electronics, and these things.
But a hard short is basically anything on a power supply rail circuit that has a near 0 resistance to ground when its not supposed to, aka, shorted. short circuit.