I've heard that UE8 always need to be replaced. Not sure though.
I think alcohol (forget the exact name) neutrilizes it. Again, not sure.
I think alcohol (forget the exact name) neutrilizes it. Again, not sure.
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SE/30 shows Simasi-like pattern when a PDS card is installed
- Thread starter Boctor
- Start date
I've washed the entire board with alcohol, agitating the container gently. It is now drying next to a fan, which was mostly needed because of the fumes. I doubt I'll be able to get the SE/30 working again without guidance, let alone at all. However, I have a decent camera available, so I can now get some shots of the board. If anyone is willing to take a look at it, I will probably put the photos in an imgur collection.
Just to be completely positive, are those yellowish lines the traces themselves? I have barely worked on multi-layer PCBs. I saw some that were kind of bad near one of the VLSI chip, and a bunch that have practically disappeared near the PDS slot. I'll be absolutely certain to get photos of these.
Just to be completely positive, are those yellowish lines the traces themselves? I have barely worked on multi-layer PCBs. I saw some that were kind of bad near one of the VLSI chip, and a bunch that have practically disappeared near the PDS slot. I'll be absolutely certain to get photos of these.
After reading a few short stories about Apple's developers in the 1980's, I found that the isopropyl alcohol had completely evaporated (and stopped stinking up the room). My multimeter didn't seem to find any continuity issues, where I previously assumed traces had been broken. To see if there were still reliability issues with the logic board, I stuck it back into the SE SuperDrive. Lo and behold, not only was the SimasiMac gone, but the PDS slot had resumed working normally, and has been functioning every time I've booted the machine. Unfortunately, my AUI transceiver is about 0.5mm too thick to fit into the convex area where the port is on the Asante card. However, I will be getting an AUI (DB15 male-to-female) cable soon enough.
I guess all of my issues were caused by lingering gunk stuck beneath the ICs. The gross-looking stuff near that one VLSI chip is completely removed. Though the board isn't cosmetically perfect, my old soldering job is decent enough to last, and the traces are all safe and sound now. I should have washed this thing a lot more thoroughly in 2015. Oh yeah, and I excluded the PRAM battery. It's not a Maxell or anything, but it'd still be risky to keep inserted.
P.S. I'm very sorry for blowing any of these problems out of proportion. I'm not an expert with the soldering iron, so I fear the worst when a temperamental logic board ceases to work. Thanks for all your advice & suggestions. In the end, this was very rewarding.
I guess all of my issues were caused by lingering gunk stuck beneath the ICs. The gross-looking stuff near that one VLSI chip is completely removed. Though the board isn't cosmetically perfect, my old soldering job is decent enough to last, and the traces are all safe and sound now. I should have washed this thing a lot more thoroughly in 2015. Oh yeah, and I excluded the PRAM battery. It's not a Maxell or anything, but it'd still be risky to keep inserted.
P.S. I'm very sorry for blowing any of these problems out of proportion. I'm not an expert with the soldering iron, so I fear the worst when a temperamental logic board ceases to work. Thanks for all your advice & suggestions. In the end, this was very rewarding.
Congrats on fixing it up 
