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Reminder to NOT turn on an old Mac that you found (PHOTOS INSIDE)


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How many SE/30s does one person need? Apparently, always more! (Somebody stop me.) I picked one up today, and the owner wanted to plug it in and show me that it worked - I said, "That's okay. I'll buy it even if it doesn't work."

 

So I get it home, open the back, and find a LOOSE hard drive - someone had TAPED it to the floppy sled.

 

Then I pulled the logic board, and fortunately, the battery was intact, but there was something missing. Also, there was an odd bracket between the battery and the ROM:

 

IMG_0339.jpg.e6804ecbea75a9a2adaee31599c5bf3c.jpg

 

Odd no? I'm still not sure if that's glued in or what. Also, notice something missing?

 

It has a CRT that I didn't recognize too:

 

IMG_0340.jpg.534b7a91e730c2e4f0def07f49568c20.jpg

Non standard?

 

IMG_0341.jpg.dcc09e697f45b2247a41fda1bd1e8983.jpg

 

Made me wonder if it had been replaced - or maybe the later SE/30s came with a Matsushita.

 

And as I was cleaning up the board a bit with C3H8O, two of the capacitors jumped ship, so I decided to pull the rest of them. And I was expecting 11, so was surprised when:

 

IMG_0342.jpg.a473355ee5a6004e089b84a63474de1c.jpg

 

TEN capacitors. Is this just a later logic board? Where's #11? Well, as you saw above, C12 made an earlier exit.

 

Also just noticed the odd man out in the RAM - I wonder if the original owner ever had RAM issues due to that 9 chipper.

 

Anyways - just a reminder not to plug it in and see what you get. Here are some more photos of the board and such:

 

IMG_0344.jpg.d825f9f7a47b07d80c545dd79c30e8b7.jpg

How can you tell what size RAM that is? I can tell on a PC from 1988.

 

IMG_0345.jpg.b08eaf60fd35e1e252734985d8f75f63.jpg

 

IMG_0346.jpg.0fe6a64d3d324d44740cb445378a34f4.jpg

 

IMG_0347.jpg.0dcc9692b2ed55dc1f0d800525fb5edf.jpg

 

 

Edited by ben68
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9 minutes ago, superjer2000 said:

I don't recall ever seeing a Matsushita either. Also I don't think I've seen a resistor on the test connector on the logic board edge before. 

I noticed that too - not sure why that's there - maybe it has to do with the CRT. The flyback Tx is all standard.

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That little bolt between the battery cage and the ROM SIMM holds the ROM in place. The tabs on the socket are probably broken or worn out. Actually a smart way to keep it in, going to have to try this myself.

 

It looks like the anode is on the side of the tube that’s facing the analog board.

On some CRTs you had a metal grounding strap hooked around the the tube, that’s what the little glued on wire is suppoed to do I would guess.

 

Resistor on the test connector is normal. I have seen that on a few boards already (on a fee different Macs, not only SE/30s)

It is a pullup resistor for the serial line. For the SE/30 that resistor is in the schematics but it is nowhere on to be found on the logicboard. They must have left it out on later models as it seems is not needed.

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I'm wondering if the previous owner had some of the RAM slots replaced as well.  In all the ones I've seen the RAM slots were all the same color but your pic shows half white and half black.

8 hours ago, Bolle said:

That little bolt between the battery cage and the ROM SIMM holds the ROM in place. The tabs on the socket are probably broken or worn out. Actually a smart way to keep it in, going to have to try this myself.

I seem to recall someone saying they needed to do that with the ROM-inator II, though I can't for the life of me remember where I read that.

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7 hours ago, EvilCapitalist said:

 

I'm wondering if the previous owner had some of the RAM slots replaced as well.  In all the ones I've seen the RAM slots were all the same color but your pic shows half white and half black.

 

 

I have a board that’s the same way, pretty sure it came from the factory with two different colors. The solder spots on mine are definetly factory-grade on both RAM banks.

I would guess they went out of one color right in the middle of populating one board.

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Question. Where did you get this? 

 

Reason why I ask, is I recall doing a SIMM mod like that years and years ago to one I sold in a yardsale and I remember it looking exactly like that. 

 

But the CRT and the "mods" there were not there of course. So who knows. 

Edited by techknight
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It's from a fellow in Sacramento. The RAM is factory, and the ROM has one broken clip - hence the brace. Now I have three logic boards to recap (and only one set from Trag). 

 

Any recommendations for getting the oxidization off the chip legs? I tried a toothbrush and isopropyl alcohol, but the discoloration remains. I'm still too chicken to put it into dishwater and scrub it.

Edited by ben68
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59 minutes ago, ben68 said:

It's from a fellow in Sacramento. The RAM is factory, and the ROM has one broken clip - hence the brace. Now I have three logic boards to recap (and only one set from Trag). 

 

Any recommendations for getting the oxidization off the chip legs? I tried a toothbrush and isopropyl alcohol, but the discoloration remains. I'm still too chicken to put it into dishwater and scrub it.

You know the liquid cleaner for jewellery Why not try that it made my wifes ring really shinny and tried some coins and they looked new within 30 mins

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5 hours ago, ben68 said:

It's from a fellow in Sacramento. The RAM is factory, and the ROM has one broken clip - hence the brace. Now I have three logic boards to recap (and only one set from Trag). 

 

Any recommendations for getting the oxidization off the chip legs? I tried a toothbrush and isopropyl alcohol, but the discoloration remains. I'm still too chicken to put it into dishwater and scrub it.

 

It would be interesting if my yard sale mac all these years later wound up there somehow. I remember doing this mod to hold the ROM SIMM in. But everything else thats happened must have been afterwords. 

 

Then again, it could be a different one. Who knows?

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