Recent content by eraser

MicroMac is long out of business. :( The site is still up but the business is gone. It's cool having the site still around but it's sad because it teases us with all the upgrades that are no longer for sale.

This is the replacement flyback: https://www.ebay.com/itm/121655780759 A flyback transformer is custom for the circuit and purpose. It serves a precise function in the circuit and you can't replace it with a generic part like you can with a capacitor or general purpose transformer. I have...

There are NOS ones on eBay right now. You just got to pony up the money ($150).

Yeah, although the results are mixed. I've bought analog boards for their flyback and found that they had already started arcing or were nearing the end of their life. :( It's the analog board lotto.

You are a few years late. They used to go for $20 or so. Today you are lucky if you can find one for under $150. :cry:

UPDATE. I found a working SE analog board to use as a comparison. I tested continuity and resistance with a multimeter on all the components on the board and found some distinctly conflicting values near the flyback shield. CR7 - In circuit on a healthy board I get 4.26MΩ going from red to...

Yes, C15 ... the 3.9uF cap at the top of the board. I replaced it with an appropriate film cap.

Yes. I double checked every cap ... orientation is correct, specs are correct. There are no solder bridges. I also checked continuity for all of them along the traces and every one of them tests good. I am going through Larry Pina's Dead Mac Scrolls now to see if I can identify any commonly...

Just tested ... logic board works in a known-good SE case. Analog board problem confirmed.

Not yet. I will try that next.

Yes. The PSU seems to be working correctly (voltages look good). I also swapped another confirmed working SE PSU on the board and got the same result. So it looks like the fault is somewhere on the analog board itself.

It had been in an attic for years and I wanted to rework it before trying to turn it on. I've learned painful lessons from trying to turn on vintage equipment that has sat idle for years. (💥💨) I suspect that it would not have worked prior to recapping.

Hi all. I recently recapped a Mac SE's analog board and am having some trouble with it. When I turn the Mac there is no bong and the CRT lights up with a garbled display. After a few seconds the CRT will begin to dim. I tried adjusting the brightness knob at this time to see what would...

That sounds like a mistake during the recap job. There is no reason why new caps of the correct spec would doom a PSU.

Thanks trag! The interesting thing about the G4s was that if a new G4 with L2 cache was attached to a new CPU board it would treat the former L2 as L3 cache.  I was hoping that was the case with the G3s. :(