General Category > Lisa Troubleshooting and Repair
Restoration of a Lisa 1
snuci:
Thanks again stepleton. This morning I ran out and got some WD-40 Specialist Dirt & Dust Resistant Dry Lube PTFE spray and removed all the lube from the rails that I could as it did not make a difference. I then took three videos. One with my "good" Twiggy floppy drive as a reference and two videos of the "bad" Twiggy floppy drive both before and after lubing just the rear screw drive. I think that did it!
Here are the videos. Note that he floppy is bad and dies on formatting occasionally. I can visibly see a track that was damaged but I have been using this continually for testing. You will also note that my "bad" Twiggy floppy occasionally does work but it dies looking for calibration more often than it working.
The first thing I do is insert the floppy while using Blu. I then try to format. On the lubed video the format fails so I use the "disk clean" option to get the head moving.
Good Twiggy sounds:
http://vintagecomputer.ca/goodtwiggysounds/
Bad Twiggy Before lubing:
http://vintagecomputer.ca/badtwiggybeforelubing/
Bad Twiggy After Lubing:
http://vintagecomputer.ca/badtwiggyafterlubing/
stepleton:
I think my drives sound closer to your "bad" drive :D
I'm still waiting for my Tri Flow---once it gets here I look forward to seeing if I get similar results.
Were you able to manually turn the lead screw in order to do the lubrication? I couldn't get mine to move, but was not going to try and force it.
Does your "bad" drive always fail at roughly the same spot of the format? I wonder if your drive has the same head pressure issues that mine has.
snuci:
--- Quote from: stepleton on May 19, 2020, 03:25:52 pm ---I think my drives sound closer to your "bad" drive :D I'm still waiting for my Tri Flow---once it gets here I look forward to seeing if I get similar results.
Were you able to manually turn the lead screw in order to do the lubrication? I couldn't get mine to move, but was not going to try and force it.
--- End quote ---
I think that will help. No, you can't move that screw. I just sprayed it and the first time it was used after spraying was what you heard in that video. It sounded terrible before. During the "disk cleaning" or Option N, it would squeak each time it went back and forth. Now it is okay.
--- Quote from: stepleton on May 19, 2020, 03:25:52 pm ---Does your "bad" drive always fail at roughly the same spot of the format? I wonder if your drive has the same head pressure issues that mine has.
--- End quote ---
No, it usually fails right in the beginning (95%) or a few tracks in. If I change that bad chip, it works fine with no issues. As a matter of fact, my oldest Twiggy drive didn't have any foam pads for the extra pressure so I cut them myself and with two-sided tape, I put them into both spots on the upper frog arm (if that is the correct term). I never tried without to be honest. I had similar issues with single sided drives that have had the pressure pad missing from the arm above (and/or below in this case) as this adds the extra pressure needed for a good read. I just replaced the foam out of habit during initial drive checks. Perhaps you might check if your pads are missing?
snuci:
After the final IC came, I did some testing with the Lisa and all seems fine. I have a couple of feet missing so it wobbles when I eject a disk in the video but otherwise it is 100% working and restored.
Here's a link to a quick YouTube video.
https://youtu.be/JlJvw4b7gMg
rayarachelian:
--- Quote from: snuci on May 30, 2020, 04:19:24 pm ---After the final IC came, I did some testing with the Lisa and all seems fine. I have a couple of feet missing so it wobbles when I eject a disk in the video but otherwise it is 100% working and restored.
--- End quote ---
Very nice!
I used these on both the front and the Lisa keyboard: https://www.amazon.com/gp/product/B01M8I6YLH/ - the base is the same though the shape is slightly different from actual Lisa rubber feet.
--- Quote from: snuci on May 30, 2020, 04:19:24 pm ---Here's a link to a quick YouTube video.
https://youtu.be/JlJvw4b7gMg
--- End quote ---
That video's very neat, mind if I steal some frames from it for a Lisa 1 skin for LisaEm?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version