Plus project

[petteri]

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.

 

[petteri]

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.

 

[dcr]

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.

 

[dochilli]

Could be a problem with the ROM. Reseat and clean the chips. Do the same with the RAM.

 

[petteri]

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.