Recent content by ttb

Alright, these measurements are from my other SE/30, recapped with the same caps. All are waveforms of the ascending tones played when the interrupt switch is pressed. I changed the system volume to 7/7 before testing.  Note: These are all with respect to ground. I also measured across the...

Alright, unfortunately I have bad news. The SE/30 with solid tantalum caps is my non-working unit, so I am unable to get the comparisons. My two functional SE/30s both have polymer tantalum capacitors. I did, however, measure the 1kHz waveform at the speaker jack (with the speaker plugged in)...

Alright, I haven't done both SE/30s yet as my solid tantalum system is awaiting a new HD right now, but here are some preliminary results and methodology so you guys can hopefully compare.  Test method: I generated a 1kHz sine tone with Sound Edit 16. It's 10 seconds long and has an 80%...

This is the cart I use whenever I order a set of SE/30 logic board caps: https://www.digikey.com/short/z134vr The specific part is this: T521V476M020ATE090 KEMET | Capacitors | DigiKey I'm using KEMET 20V poly tant caps for all of the 47 uF parts. Nominally its a "low ESR" part with a 90mOhm...

For no good reason I'm trying to go beyond the 36MB I currently have in my Mystic CC. I've read that modules need to be single-banked if 64MB or 2K refresh if 128MB (http://www.colourclassicfaq.com/mobo/mystic.shtml#Q2.1.6). I ordered a 64MB module from MemoryX that they claimed worked with the...

That's pretty interesting. With my recapped Sony PSUs I had adjusted the output to be 5V on the dot with a calibrated meter. As you can see from the o-scope trace earlier it's still bang on with the accelerator loading it up. Conversely, my (now dead) Astec was only putting out 4.84 V which...

Oh, of course. I was thinking of the male-female ones that I @joethezombie used earlier in the thread. It sounds like you used female-female standoffs or maybe had it with the male end fastening the PCB? Anyway, I ended up using male-male M2.5 standoffs with screws on both sides: Finished...

From what I've read there are many patterns that can indicate different types of failure. When I have a RAM/ROM issue with my working boards the screen looks like this: That's quite a bit different that your zebra bar pattern (which I think is maybe the real "simasimac" pattern). I would try...

That's another good point. Both of my faulty-config ABs are also recapped (with the same caps) so I shouldn't rule them out, either. On the 5V rail itself it looks like there's just a 100 uF cap in what looks like an RC filter for the AB, but it's certainly possible the other circuits on the AB...

Alright, this is (somewhat) solved. As @Crutch pointed out, there's no reason to trust two power supplies, especially since I recapped both with the same parts. I first tried splicing in a lab power supply between the AB and LB, but it appears the LB either looks for the -5 and -12V lines...

Another update on page 9 (power connector: the ground isn't shown on pins 1-5, 7, 8 as it is in the original: Sorry for dropping all these here, I'll figure out github one of these days!

Also, adding to this thread since I happened across this and someone in the future might find it useful as it's relevant to question 2 in the OP. The Artmix site had a page that talked about firmware versions here: https://web.archive.org/web/20070814112501/http://www.artmix.com/romver.html On...

The PSUs are both stock Sony and both recapped except for the one large 400V cap that I bought in the wrong size (too tall). I recapped them both with the same caps, so it's quite possible I did something consistently stupid, though :) I'm thinking I'll try to rig up a lab power supply to the...

Alright, I have an interesting data point to share. I just procured a PowerCache P33 and swapped it in for the Turbo 040. Same result! Flashing question mark initially, but blipping the power causes it to boot. So the good news is that my accelerators either both work fine or are miraculously...

I am trying to get a Daystar Turbo 040 working in my SE/30 using one of @Bolle's short adapters. I've already managed to work through other issues, but this one has me stumped. Basically, the machine will not find any startup disks when it boots from a cold start (e.g. flipping the power switch...