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Fair play to you! Stress is bad alright...hope it works out for you...what's your job description now? Messing around with Macs...nice one!

Is there no Maplin's near you? Pain having to go through mail-order for those small bits and pieces. Did you try http://ie.rs-online.com/web/ ? Next day delivery, based in Dublin. Hope you'll get it going!

Cool! I'd love to get one, but I assume they are pretty rare. Although not quite as cool as AST's Mac86 SE card...now that would be the ultimate as far as I am concerned. Does anybody here have one / have info other than what's on the net (which isn't much). Even rarer than the MacCHARLIE I...

Congrats! Another one saved :)

Quite possible that the vinyl sleeve is not inserted properly and gets caught by the rear bucket. The sleeve needs to be pushed into the little plastic thingies that hold the analogue board.

Really? That's really unusual! But at least I know now that the clock signal is not the problem...nice sine wave at all the chips that need a clock. Had a look at the M68000 datasheet and it specifies CLK as requiring a nice square wave. I wonder how they're getting away with a sine wave...

Yeah I checked there too :p Further down the line I'm still getting the same sine wave though...I hope it's not my cheapo scope :)

The horizontal lines don't look like a video system problem to me, if it were vertical lines, it would be easier to figure out! Those SE/30's never cease to amaze with the type of problems you get. A new one every week :) PS: does anyone know what the 16Mhz clock signal on the SE/30 is...

Nice job on the recapping. I had ghosting like that once and it was a bad (in my case non-existent :) ) ground connection on the CRT. Maybe check the CRT grounding strap on the video board that goes to the CRT frame.

Might try the 10 pound sledge to kick start the transistor :)

Yeah Miniscribes make some cool sounds, mine nearly purrs like the stepper motor in old Commodore disk drives :) Has anyone else experienced read errors when using them? Techknight reckons it could be the head amps so I guess there is nothing you can do unless you have replacement parts.

Not even sure if overvoltage has caused the problem. PSU is a funny design alright, there is a big old transformer that outputs 37 VAC form a range of mains voltages (110-240V) and feeds a switch mode power supply. I can't see any obvious damage, desoldered rectifier and chopper transistor...

Yeah I can't be sure if over voltage has caused the failure. Just saying that the wrong voltage setting could be a problem and that voltage selection is not automatic. At least I found some schematics for it already, but there are some really hard to find components in there :O

I finally managed to find a reasonably priced ImageWriter II on Ebay last week. Description said unit did turn on but no further testing was done. Seemed safe enough so ended up winning the auction for about 15 Euro. It finally arrived yesterday and I proceeded to, as I always do with old...

I think that's correct, also I think my LC allows me to change the resolution from 512x384 to 560x384 to support the IIe card (which I really really want :) ). I think that's why the 12" RGB has a slightly higher horizontal refresh rate compared to the compacts to account for the extra...

Ah no! This one was driving me mad for a few weeks as well. I was close to giving up on it too. Well here's what I had to replace to get it working again. Symptoms: low voltages on start-up. Voltages stabilise after a while and computer boots and works OK after that. Solution: replace...

Sure enough that was the problem. Thanks man :) Funny thing is the diode in the optoisolator tested good at room temperature, but once I hit it with cold spray it would stop working. And even stranger testing with a multimeter it checked out OK, no matter what the temperature. I replaced it...

Pity you didn't get it working! That VIA pin goes to the edge connector. I tried to built a diagnostics harness, which requires grounding that pin. The diags didn't work, but when I attached the connector, the faulty board booted right up. That pin is pulled up to 5V normally, but pulling it...

Spoke too soon! I still have problems with this. Tried a cold start (room temperature of about 10 Celsius / 50 Fahrenheit) and voltages were about 10% below spec. A quick blast with the heat gun and voltages were in spec within about 15 seconds and stayed there. Rock solid after this for an hour...

Micron's patent for SE/30 grey scale system: http://www.google.com/patents/US5307083'>http://www.google.com/patents/US5307083 with circuit diagram for grey scale video board: US5307083-4.png Or this website, which basically describes what you're tying to do (author's just using a...