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Re: TRS-80 Model 100 Board Replication

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Black Epyon <Blackepyon01@yahoo.ca> writes:

> On Saturday, 18 February 2023 at 01:04:51 UTC-8, Daniel wrote:
>> Daniel <m...@sc1f1dan.com> writes: 
>> 
>> > I guess I've decided to do a board replication project starting on the 
>> > M100. At this point, I'm looking for a dead model on ebay but no one 
>> > wants to sell for less than $100 with shipping it seems. I'd pay $50 for 
>> > a 'for parts' unit. 
>> > 
>> > Success will define this project if I can get some assistance. I have 
>> > designed pcb's in the past but for simple projects. This will be, by 
>> > far, my most complex effort to date. And I hope a success in this 
>> > project will lead to more restoration projects in the future. 
>> > 
>> > Daniel
>> Okay the victim 100 came in the mail today. It is as described. Looked 
>> like it went through some serious abuse. Some black markings on the side 
>> as if it was exposed to a high electric load. LCD is finished. Stickers 
>> on the bottom with serial number are almost wiped clean, figure that 
>> out. Wherever it was from originally, it was really not loved, liked, 
>> disliked, or even hated. This little box was treated like a mafia hit 
>> victim. 
>> 
>> Cracking her open and seeing the boards. 
>> 
>> https://imgur.com/Bzek9eA.png 
>> https://imgur.com/yhEDNnt.png 
>> https://imgur.com/osSS0oG.png 
>> https://imgur.com/0ev3sTB.png 
>> https://imgur.com/u6I8CWw.png 
>> https://imgur.com/Jvwls7M.png 
>> https://imgur.com/8mZVQwE.png 
>> https://imgur.com/H84Olmj.png 
>> https://imgur.com/tBgWLYn.png 
>> 
>> As I thought, a ton of residue. And time for deconstruction. 
>> 
>> Anyhoo. Enjoy the images, I guess. 
>> 
>> Daniel
>
> The LCD is definitely buggered, but just because the liquid crystal
> leaks through the layer doesn't mean you can't get a picture (at least
> enough to see if the rest of the board works, it's worth a shot). The
> rest of the board should come clean with some cleaning vinegar and a
> light scrubbing. I wish I took pictures of the one turbo-XT I restored
> (Varta splooshed everywhere, blown tantalums, etc, had to replace one
> of the ISA slots, the corrosion was so bad), because as far as
> corrosion goes, both these boards are fairly light.
>
> --Kyle

I pulled the board out yesterday and did some serious scrubbing with the
vinegar. The solder-side of the board is more-or-less clean
now. Denatured alcohol is banned in my state of California. The hardware
stores don't carry 99% alcohol on the shelves. So I bought 91% from the
drug store. So stupid. 

My soldering iron, it turns out, isn't staying hot enough to melt
solder for very long. I am asking Mr. Carlson's Lab on youtube to fix it
and feature it on his channel.

Meantime I have to get another iron to do the work, and looking for a
solder vacuum that won't break the bank. Alot of the joints are really
hard to melt due to the caked on flux. Pain in the ass how hard it is to
depopulate this board. 

This device sat through a high heat environment - enough to make the
plastic on the molex connectors discolored while the male ends are
prestine white. The edges were cracked or broken off and dry making them
difficult to separate without destroying them. Chunks of resistor and
disc capacitors started flaking off during normal handling. It is tough
to imagine that the chips on this device survived the abuse. I'll have
to research how to test the non-memory chips before I decide what to do
with them.

If things go well with this project, I'd like to repopulate these
components on a newly minted set of boards. Of course, I have the hurdle
of desoldering them from their pcb jail.

Even though it's been frustrating at this point, I'm still having a
great time.

Daniel

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TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-06 02:32 +0000
  Re: TRS-80 Model 100 Board Replication Black Epyon <Blackepyon01@yahoo.ca> - 2023-02-06 07:07 -0800
    Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-07 08:25 +0000
      Re: TRS-80 Model 100 Board Replication Josh Malone <josh.malone@gmail.com> - 2023-02-07 07:16 -0800
        Re: TRS-80 Model 100 Board Replication Walt Perko <r4rguy@gmail.com> - 2023-02-07 09:58 -0800
        Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-09 10:41 +0000
        Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2025-11-08 21:44 -0800
  Re: TRS-80 Model 100 Board Replication bill <bill.gunshannon@gmail.com> - 2023-02-06 10:11 -0500
    Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-07 08:20 +0000
      Re: TRS-80 Model 100 Board Replication bill <bill.gunshannon@gmail.com> - 2023-02-07 12:31 -0500
        Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-13 12:23 +0000
          Re: TRS-80 Model 100 Board Replication David Plass <dplass@gmail.com> - 2023-02-16 10:04 -0800
            Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-17 07:28 +0000
  Re: TRS-80 Model 100 Board Replication Walt Perko <r4rguy@gmail.com> - 2023-02-07 04:36 -0800
  Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-18 09:04 +0000
    Re: TRS-80 Model 100 Board Replication Black Epyon <Blackepyon01@yahoo.ca> - 2023-02-19 06:43 -0800
      Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-20 10:16 +0000
        Re: TRS-80 Model 100 Board Replication Black Epyon <Blackepyon01@yahoo.ca> - 2023-02-21 07:16 -0800
  Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-21 10:21 +0000
  Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-02-27 01:53 +0000
  Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-03-03 14:43 +0000
    Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-03-10 17:53 +0000
      Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-08-07 07:16 +0000
    Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2023-03-23 10:12 +0000
      Re: TRS-80 Model 100 Board Replication Bob Campbell <none@none.none> - 2023-04-02 04:14 +0000
        Re: TRS-80 Model 100 Board Replication Walt Perko <r4rguy@gmail.com> - 2023-04-02 04:55 -0700
          Re: TRS-80 Model 100 Board Replication Bob Campbell <none@none.none> - 2023-04-05 03:52 +0000
            Re: TRS-80 Model 100 Board Replication Walt Perko <r4rguy@gmail.com> - 2023-04-04 22:25 -0700
              Re: TRS-80 Model 100 Board Replication bill <bill.gunshannon@gmail.com> - 2023-04-05 08:51 -0400
                Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2025-11-08 19:14 -0800
  Re: TRS-80 Model 100 Board Replication Daniel <me@sc1f1dan.com> - 2025-11-13 21:29 -0800

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