Recent content by egrath

Can anyone please tell me if a voltage output of 2.8V on UB2, Pin 3 is normal when batteries are inserted, but the logicboard is otherwise don't connected. I measure from B2 negative to the UB2 Pin 3. And is it normal that when measuring from B1 negative to UB2 Pin 3 that there is no voltage...

Thanks for the link, I'll take a look into it!

Hi, I have a Macintosh II here that I got as DOA. Recapped and cleaned everything, looks good so far. However, one issue remains: The device powers on as soon as voltage is supplied to the power supply. Also Soft-Power-Off does not work. Any hints on what I can check first? With kind...

The area around the capacitors looks good - the board has been recapped before the caps became leaky: With headphones attached, at least the different volumes level work as expected. However, it's slightly noise, somewhat like the noise you hear when making a mobile phone call.

Tried the following now: 1. Cleaned the contacts on both, the logic board and the speaker assembly unit ==> no change in behavior (just two levels: Quiet and Silent) 2. Replaced the entire speaker unit with a known good one ==> no change So my assumption is that something on the logic board is...

Thank you for the hint, I wrote the guy over at vcfed, maybe he's able to provide a copy.

Hi, is anyone in posession of a copy of Micro-Cap II for Macintosh? Since the company behind it has dissolved and released the software as freeware (available here), perhaps someone who still has a copy could share it. With kind regards, Egon

@Melkhior Thanks for the hint, I now ordered the PCBs from JLCPCB and the parts from Digikey. As I only want to keep 2 of them later on, I will put 3 of them up for trading as soon as I finished soldering them.

Hi, I intend to build one of those ATX converters from this thread to resurrect a IIsi which is missing it's power supply completely. But I'm slightly confused of all the different versions floating around here, so I don't know exactly which one I should build and which ones fits my needs. What...

@Durosity I can confirm that the drivers you gave the link work for my card, just brought my IIci online :cool:

Thanks, I try that. But just out of curiosity, if the contacts are corroded and therefore have a higher resistance, shouldn't there be more levels than just quiet and silent?

Hi, the speaker of my IIsi shows a interesting behavior: It's very quiet, no matter which level I set in the control panel. Essentially there are only two states: very quiet for all levels >0, and completely silent (as expected) for 0. Any ideas what could be the reason for this or which...

Thank you very much, will try these drivers!

Hi, I got the following Nubus network card: Does someone know which model it is? Can't find anything about this one online, the closest match is a Farallon PN590 which has a extremly similar PCB layout but nontheless differs. Any help is greatly appreciated. With kind regards, Egon

Thank you, will do that!