Recent content by JNizzle

I have a Mac Plus that has been working perfectly for decades, but it has recently developed a few issues. When the Mac boots, it will promptly reach the desktop as usual, but anywhere from 1-5 minutes after booting, the Mac will crash out entirely to a blank screen and replay the startup bong...

Awesome! This may come in very handy with my Classic, which I've hit a bit of a wall with. Thanks!

We're talking about C33 and 36. I'll take a photo of what I replaced, and what I replaced these caps with. I'll post the links to imgur, as all my pictures are coming out huge for some reason. Caps I replaced: https://i.imgur.com/VOwJRCY.jpg What I replaced them with...

I was poking around in the power supply with my multimeter, and those two caps that I replaced have contact with ground. I'm at least 90% sure that's where my problem lies, as I was at least getting a PICTURE before I replaced them. What actual purpose do they serve? Also I've yet to find any...

Alright people, I'm still having issues with the mac. I replaced the two film capacitors with two caps of the same rating and voltage, the dude at Radio Parts (aussie electro store) said they should do the trick. I soldered them in and replaced the fuse with an identical one. However, I...

Alright, thanks for the help everyone. I bought some more caps to replace the two film ones on the AB, they're not identical, but they're electrically the same. I bought some fuses as well. When I get home I'll fix it all up, and I'll try re-seating the cables to the logic board. I'll also try...

Yeah I think I've chosen caps that are a little too high for what was originally on the AB, but I'll swap them out later. I swapped the purple 100uF 200v capacitors out for 100uF 400v ones. Also, you mentioned that the caps might have trouble staying "formed". What exactly does this mean? I...

Okay, noted. I will replace those caps as I just checked, and they do look a little old and cracked. Also, I was under the impression that any capacitor could be replaced by one with the same capacitance, but any HIGHER voltage, as the voltage on a capacitor is only it's minimum voltage...

Okay, now some deep dark stuff is going on. I plugged it in, and it's fuse blew in half. It tripped the whole house, everything went dark. I can't do any more testing until I find a new fuse, but this has me thinking, is there just some potentiometer I just need to adjust?

Alright, so I resoldered all the contacts around the flyback transformer, and I resoldered the area around that burned-out CRT power plug that I mentioned, because it was covered in a dusty black residue. I'm not sure if this fixed my problem though. I seem to be getting a more solid...

As I've been turning this Mac off and on throughout the day to test how my repairs have been holding up, I've noticed another weird thing. There is no startup bong and the screen does this stripy half-on kinda thing, where the top of the screen just isn't working and the other half is showing...

Hello people! I recently acquired a Mac Plus while doing a clean out of my grandfather's old factory. The keyboard and mouse were FUBAR, as they had been left under an old can of paint which leaked all over them. He said that there was also a hard drive somewhere, but we couldn't find it. I...

Thank you so much for your help, I'll definitely try this when my exams are over! I met someone who will lend me a Mac Classic in perfect working order, so I'll be able to test most of my components in there and hopefully rule out some issues.

I tested the voltages, I discovered I'm getting about 4.4v and 11.4v. I adjusted the potentiometer, and I can nail 12v, but I can't get 5v. It just seems to top out at 4.6v and I can't get it any higher. Thoughts?

Hey guys!  Recently I managed to pick up a Macintosh Classic in very good nick, however, it wasn't working. The previous owner told be that he was using it one day, and the Mac made a bang and stopped working. He said that the fuse had gone, and that I would simply have to plug in a new fuse...