Image Map Image Map
Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: TRS-80 drive realignment experience

  1. #1

    Default TRS-80 drive realignment experience

    I've written this drive alignment adventure up for those who might be interested.
    https://www.classic-computers.org.nz...ealignment.htm

    Tez
    ------------------------------------------------
    My vintage collection: https://classic-computers.org.nz/collection/
    My vintage activities blog: https://www.classic-computers.org.nz/blog/
    Twitter: @classiccomputNZ ; YouTube Videos: (click here)


  2. #2
    Join Date
    Jun 2018
    Location
    Pacific NW in the islands
    Posts
    180

    Default

    nice bit of work, tezza. i’m not familiar with Floppy Doctor—we used our own diags—but it seems to have worked well for you. good thinking on being a track off!

    on those drives the head assembly is attached to the stepper with a metal band and screw. if that screw is loose, that could explain the noise and what caused your drive to fail. be worth checking if it fails again. not sure if it’s worth going back in to find out.

  3. #3

    Default

    ^^^^

    I've had that set screw loosen in nearly all Texas Peripherals and Tandon drives that I own (some almost new). I think it takes one bad disk that causes the head to overstep its bounds (loud grinding) and alignment gets thrown off if that screw is the least bit loose. The first time it drove me crazy, align the drive perfectly and a day or two later it would be off again. Now it's the first thing I check. Never seemed to be an issue back in the day...never paid attention, but I wonder if they put a drop of loctite on those screws which didn't age well?

  4. #4
    Join Date
    Jun 2018
    Location
    Pacific NW in the islands
    Posts
    180

    Default

    Quote Originally Posted by Torch View Post

    ...but I wonder if they put a drop of loctite on those screws which didn't age well?
    yes, we used loctite! no idea about the aging, but apparently not at least in some instances.

  5. #5
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
    Posts
    756

    Default

    Problems which mysteriously appear and disappear always come back!

    On the old C64 alps drives, there is a stepper motor pulley and shaft and eventually the head knocking will loosen them and it will spin in place. You can loc-tite it, or better yet, drill and pin it to fix it permanently.

  6. #6
    Join Date
    Apr 2018
    Location
    Los Angeles, CA
    Posts
    920

    Default

    Quote Originally Posted by tezza View Post
    I've written this drive alignment adventure up for those who might be interested.
    https://www.classic-computers.org.nz...ealignment.htm

    Tez
    Thanks for the new article. I actually read your original article about the Philip Avery method to learn where things were and what to adjust. I went a little off book in that what i ended to doing was putting the floppy as drive zero, inserting a known good floppy in the drive, and i would adjust the screw a little and hit the reset button until it would boot properly. I tested and refined it afterwards with the floppy doctor disk . That seemed to get me there. I didn't have a scope at the time and meant to revisit later after i got one but it's been working fine so i haven't bothered.
    -- Brian

    Systems: Amstad PCW 8256, Apple IIe/II+/GS/Mac+/Mac 512k, Atari 800/520STFM, Commodore 64/128/Amiga 3000/PET 4032/SX-64, IBM PS/1 2121-B82, Kaypro II, Osborne 1, Tandy 1000 SX, TI-99/4A, Timex Sinclair 1000, TRS-80 Color Computer 3/Model 4 GA

  7. #7

    Default

    Thanks for those comments guys. Yea, all the screws holding the stepper assembly did seem tight enough when I had to loosen them. That's not the say whatever they were screwed into did not go awry despite that. Anyway, yes, if it happened once and a reason was not discovered it might happen again. That's why I'll keep it as Drive 1 rather than Drive 0. With a FreHD to keep the Model 4 company, that's likely to be the least used drive in the whole system.

    Tez
    ------------------------------------------------
    My vintage collection: https://classic-computers.org.nz/collection/
    My vintage activities blog: https://www.classic-computers.org.nz/blog/
    Twitter: @classiccomputNZ ; YouTube Videos: (click here)


  8. #8
    Join Date
    Jun 2018
    Location
    Pacific NW in the islands
    Posts
    180

    Default

    so, there are screws to align the stepper and there is a single screw that fixes the stepper band to the head. it’s the latter that we’re talking about.

    C712BB79-D95A-4ACC-B03A-C6DC6C518190.jpeg

    not my best artwork, but you get the idea. just want to make sure we’re taling about the same screw.

  9. #9

    Default

    Quote Originally Posted by shank View Post
    so, there are screws to align the stepper and there is a single screw that fixes the stepper band to the head. it’s the latter that we’re talking about.

    C712BB79-D95A-4ACC-B03A-C6DC6C518190.jpeg

    not my best artwork, but you get the idea. just want to make sure we’re taling about the same screw.
    Yea. Here's the Avery article (see link). The screws in Photos 1, 4 and 5 all seemed relatively tight when I came to loosen them prior to adjusting the cam screw.
    https://www.classic-computers.org.nz...andon-m100.htm

    Tez
    ------------------------------------------------
    My vintage collection: https://classic-computers.org.nz/collection/
    My vintage activities blog: https://www.classic-computers.org.nz/blog/
    Twitter: @classiccomputNZ ; YouTube Videos: (click here)


  10. #10

    Default

    thank you for the articles, Yours and Avery's, since seemingly its impossible to find an alignment diskette now a days, I will work on the TP & Tandon 2a drives I have, to see if I can resurrect some "disk error" spewing ones.
    I know a few other floppy drives are missing the (tm-100-a mind you) the soft counter pad to the head and I have yet found substitute to those but i guess that is another subject.
    thank you again for the other ways to "align" a FDD.
    Gaming: i7-8700K, 16GB, 1TB SSD, RTX 2060, Dual 27" LG IPS Monitors.
    Vintage: TRS-80 MODEL 4, 128K RAM, 360K FDD, Gotek USB FDD, FreHD HDD, RS232-WIFI MODEM, DWP-510.
    Programmer: Dell Inspiron 660S i3-3220 with 16GB Ram, running a BK-844USB & EP-2A-88.
    Web Site: https://texastandyrestoration.com/
    Facebook Page: https://www.facebook.com/TexasTandyRestorations/

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •