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I got this error 00000003 00040000 By looking at Troubleshooting_Your_Macintosh_1992 : The RAM test failed while testing bank B, after passing the chunk tested for code $0002. The Z field indicates which bits failed as in code $0002. Also the second line shows what bits may have failed. But not...

I am really stuck with this one.  I am 100% positive the 8DIP IC pointed with the red arrow is faulty. As I swap it from another working PSU gets the PSU going again. The Ic has only a "177" marking.  I suspected it was an op amp but it was a guess. Not sure what this little board does. I...

Anyone out there with some experience with a SE psu?    I suspect the ic in the photo is a 8dip optocoupler.    one of my SE has it faulty. Would you guys know the specs for this ic?

I've made a few plots from a working SE power supply while fixing another. As I could not find a decent schematics I am uploading what I did as it could be useful to other people.

I got an LCII with a hard drive inside.  As I wanted a second hard drive I decided to make an adaptor to connect my other SCSI drive to it's rear SCSI port.  If I start with the external HD connected it boots from the external Hd and the internal is not visible. If I start with the internal...

Are onboard RAM words tested on Classic II P.O.S.T? If they are not is there a software that tests all onboard RAM words? Compatible with Mac OS7.

Have anyone ever successfully disassembled the Portable LCD display? I mean remove the panel from the PCB and contacts?  If so, could you share your results?

I am going over a classic II board and my one has this blue bodge wire. Looking at some photos at the web I see quite a few boards with similar bodge.  Do anyone know what is the purpose of that? Is it a factory fix or DIY upgrades? Looking at bomarc's schematics I see the connection.  Can...

I have a few of these HD drives out of SEs, Classics, LCs... and they all seem to be perfect in terms of logic.  I've attached some scans I did on a good working MFD 75W 01G and that may be useful to other people trying to pin point issues with this drive. From what I can see all my non...

I got a fried resistor on my classic. I imagine that is a thermistor but not sure. From the schematics I would say it is a 20ohm at room temperature. But unsure of the watts. Can any one give me a light on that one. Another question. If I replace the resistor with an ordinary 5w 5ohm resistor...

I have replaced some leaky capacitors on the analog and digital board of this mac. I did check some of the key voltages on the switching power supply block that seems to be inline with that Bomarc schematic.  One test I did was to disconnect the +5 and +/-12 lines from the analog board and...

Is it possible to duplicate the Mac OS system 6 OS disk using the Mac Plus itself to do it?  Will DiskCopy 4.2 be able to do it?

Anyone out there with an open Mac Plus who could send an oscilloscope plot of J8 pins 1, 3 and 5? Specially pin 1 which is video out. Probing it I just got a noisy LOW signal. I was suspicious of my LAG IC but after probing V & H sync I got clear pulses at 60HZ & 22KHZ which seems to...

Hi   I bought one of these and can really get it to read or format a 720k/800k disk on my mac.    I am running mac os Mojave.    Is there anything I am doing wrong?   Cheers, Gui

I am struggling a bit to identify this fault. The computer beeps once and reads the system disk apparently fine but the only image I get is the attached one.  See image attached. Following the manual I found here on the forum seems my voltages seem ok. I did read on a post yesterday...