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...
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...
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...