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.
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. I have covered this procedure in several videos. Go to YouTube and search for ‘HeyBirt!’. And from my channel page search for ‘Model 100’. 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
