68kMLA Classic Interface

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Plus project
Posted by: petteri on 2020-05-26 07:18:56 I was looking for a mouse for my 512Ke and ended up getting a broken Mac Plus with it. Very boring unit, no extras or anything. Seems like it has the same issue with the analog board solders as my 512Ke. I was able to get some video by pushing the sides but I think it has some other issues as well. There is no startup chime and I have a hunch the logic board has been damp at some point. My first task is to do an IPA wash for the logic board and check the analog board soldering.
Posted by: petteri on 2020-05-26 13:13:20 Resoldering fixed the analog board a bit. There is still something wrong as the picture goes away if knock the box a bit. Much better than it was but looks like I missed something. But the logic board has issues. No chime, some faint burp sound looping and stripes. I am not sure what to do next, I have to read through The Dead Mac Scrolls.
Posted by: dcr on 2020-05-26 13:46:24 Resoldering fixed the analog board a bit. There is still something wrong as the picture goes away if knock the box a bit. Much better than it was but looks like I missed something. I had the same problem with one of mine. First time, I had just remelted the existing solder. That worked for a while, but then had problems again. Second time, I removed and replaced the solder. Also, I hit every solder point that looked questionable. Third time, basically the same thing, remove and replace, hit every questionable point and even some that looked fine. Last few times I booted, it was still fine. If I've broken the trend, it should be fine the next time I boot it up. If not, I guess the resoldering will be an annual event. 😉
Posted by: dochilli on 2020-05-26 14:02:48 Could be a problem with the ROM. Reseat and clean the chips. Do the same with the RAM.
Posted by: petteri on 2020-05-27 10:23:17 It was a ROM issue. I swapped a known good ROM from 512Ke and Plus boots up fine now. The floppy disk drive doesn't eject so it needs a cleanup and possibly a new eject gear.
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