Recent content by mrkirkby

I have a booster 40. The one I have is for a IICi and just fits in the cache slot. No additional drivers needed.

So take a much closer look at your ADB chip following what I found above. I'd bet it's probably just needing a bit of solder. Probe the pin to the board at each trace and see if you're missing any. Given you were loosing ADB, I'd say you have a solid bet it's the same issue. Let me know if you...

Made some progress tonight. After a ton of probing in all of the wrong areas, a number of pins on the ADB chip were found not to be making contact. It's the first I've seen this problem related to that specific part, but sure as hell once re-soldered the mac now gets to the blinking disk. I...

Should also add there’s more on this in larry’s repair secrets book detailing the se and SE30 along with expected resistance values measured in circuit.

Worth checking your bournes network packages toward the back. Take a look at attached. It was step one in my process so far but mine appears unrelated.

Got good tones on all of them. Replaced the SWIM for another from a donor machine and same result. Might be time for me to invest in a logic sniffer and have a look at the lines at the PDS. I wonder if I have a short somewhere on the board perhaps. What’s a little odd was that just after the...

Ah sorry, I think I wrote the post while still in my head a little. You know how these things are when you're thinking problems through. So for more clarity, the image shown is of the pattern you see immediately after a good mac's display comes on. Before the cursor appears shortly later...

Yes to chime. Raster is the raster pattern drawn from the ROM as described in a bunch of reference sources. Usually accompanied by a cursor but it looks like SWIM isn't initialising as per the bourns problem described above so I have raster, but no cursor. Looks like I'm perhaps missing some...

Hi Garrett, Most posts I've seen so far point toward shorts in bad traces caused by tantalums or bad vias etc. Just can't find it. I had a good hour long probe around earlier and still none the wise. Tried swapping the sony chips out too. I'm almost certain it's a via but where!? It's...

Hello everyone, I'm looking for a bit of advice. I have an SE/30 board which I've recapped but I am having problems with further diagnosis on the above problem. I'm aware of the dead mac scrolls and Larry's other book and have tried suggestions found around the web to replace the bourns...