On 2/9/23 05:17, [email protected] wrote:
There are two different causes of corrosion here. The battery has an
alkaline electrolyte, after removing the battery neutralize the
electrolyte left on the PCB with a mild acid like vinegar or citric
acid. Then clean well. I like to remove the solder from components
that have been affected and resolder. The corrosion will wick through
the solder joint making it to the other side of the PCB and eating the
via.
Good thing I have citric acid. Can I use normal alcohol you get from the
drug store? I will be re-soldering as many joints as possible to refresh
them after forty years.
The capacitor corrosion is much, much worse on the M100. Every M100
that has not already been recapped needs done. It is one of the few
machines I always recap. The electrolyte in capacitors is acidic.
After removing the capacitors scrape the worst of the corrosion off
and then treat the area with a mild alkaline solution to neutralize
any remaining acid (ammonia, etc.) Clean and repair damaged traces.
Where do you get ammonia?
I have covered this procedure in several videos. Go to YouTube and
search for ‘HeyBirt!’. And from my channel page search for ‘Model 100’.
I love your channel and have been a subscriber since before I got my
first m100. Actually, I called and left you a voicemail the other day.
Jeff Birt
*From:* M100 <[email protected]> *On Behalf Of *Daniel L
*Sent:* Thursday, February 9, 2023 4:14 AM
*To:* [email protected]
*Subject:* [M100] stupid move = expected results
Okay, a few years have passed. I get it. Things happen. Bought my
first 100 in 2020 from eBay - instantly had problems that still exist
today but I've recently identified a solution. Soon after, my second
100 came to me as an inexpensive 'for parts' unit that ultimately
worked fine - the seller didn't have the memory switch set to 'on' and
thought it was dead. The thing works like it's fresh out of the
factory. Guys, I learned that I made a big mistake. Got my 200 from
this list soon after getting my 100's and made that my daily driver
from then on. 100s found a home in the closet next to the board games.
I decided today to register them all with Web8201 and cracked her open
for the first time. I wasn't thinking too much about the insides,
stupid me, and opened it to get the necessary numbers to provide good
registration info. As I was screwing her back together, I decided to
inspect it for problems. Looked at the battery and, on initial
inspection, it looked okay. Then I looked closer and found residue on
the side, then residue on a number of via's where the nearby resistors
are soldered in.
I should have inspected it two years ago but it just sat on my closet
and I can't help but think maybe it only leaked after i got the
device. Again, I turn it on and it's splendid. I just wish I wasn't so
stupid as to ignore the inspection two years ago. Or, at least, I wish
I had at least removed the internal battery when I got it. Just
stupidity here. BONK
So now I have some soldering and cleanup to do. I assume the resistors
should be replaced? I went ahead and excised the motherboard from the
shell for deep inspection. As you can see, there are some leaking
caps, residue, and some impacted traces so... I have some restoration
work to do. And I have some components to order. I also have to learn
how to restore traces.
Pictures:
https://imgur.com/zn3fV4G.png
https://imgur.com/m6yzNzm.png
https://imgur.com/nWw3JNh.png
https://imgur.com/yMlMc5L.png
https://imgur.com/mbyV6xB.png
https://imgur.com/m1Uc6ez.png
From yall's experience, is this real bad or not too bad?
Daniel
