800k drive perpetual eject failure

[mloret]

Hello! I just replaced one of the little wheels that was broken in the eject motor on my 800k internal drive. Now, when I power the computer on, I hear the eject motor going non stop and when I insert a disk the noise gets louder. What did I do wrong here?

 

[LaPorta]

What machine? On some models of the 800k drive, early Macs send a signal on a pin (9, if memory serves), and later drive cables omitted this pin to stop the perpetual eject signal. I believe you need the yellow striped cable to stop this if I am not mistaken.

 

[mloret]

it was working fine before. I think I reinstalled the motor incorrectly. It's an SE.

 

[Johnnya101]

Did you align the gears/motor properly? I'm guessing you are talking about the small yellow colored eject gear that always fails?

 

[mloret]

Did you align the gears/motor properly? I'm guessing you are talking about the small yellow colored eject gear that always fails?

I'm thinking that I didn't and that's part of the problem. I checked online and didn't find any info. You know where I can find info on this?

 

[mdeverhart]

@LaPorta has a great video on refurbishing these drives, including the proper eject gear alignment:

 

[LaPorta]

Ok, I did not realize that this was working fine before, I thought perhaps it was a donor drive. Indeed, towards the end of the video I do show how. Also, is it possible that the eject motor cycle finish tripping sensor is installed incorrecty? I also show how to align that properly as well.

 

[mloret]

I destroyed the eject motor. I wasn’t gentle enough, but the drive still works manually. At least it reads now. I guess I’ll hunt for a new motor. I did check out your vid—thanks for sharing! Very thorough. It sounds like the alignment only has to happen if you remove the big gear that’s connected to the rotor with the lobe, right? The rest just slot in. I had a hard time putting the little pcb back.

 

[LaPorta]

Yes, that is correct. Basically all of them fit no matter what, though obviously they need to go in right-side-down. That one that hits the lobe does need to fir properly to trip the cutoff switch.

 

[mloret]

Cool. The black casing on the motor for my Mac SE is cracked in multiple places. I do have another motor but it's out of a Mac 512k and it's slightly different. I believe both drives are 800k. Do you have any idea if the motor I got out of the 512k computer will work on the drive from the SE if they are both 800k drives?

 

[LaPorta]

There are differences in the controller boards, very slight variations. One is if the leads are hard-wired vs. wires. Either should actually work fine.

 

[mloret]

There are differences in the controller boards, very slight variations. One is if the leads are hard-wired vs. wires. Either should actually work fine.

Will try. I started watching your video from the start. I made it about 30min in and was able to tick off all the things I did wrong. It's my first, so I guess it's to be expected. I might need some spare parts if you have 'em.

 

[LaPorta]

Once I move, indeed, I should have some from the few spare non-working drives I have. Send me a PM with what you might need.

 

[mloret]

ok

 

[mloret]

I just tore one of the nylon washers. I was so close! Do you know where I can find a replacement?