Search results

I ordered the boards today from JLCPCB. I have two battery bombed boards I will be using as parts boards. Should be a fun project.

Recapamac is the best resource for the vintage Mac capacitor info. https://recapamac.com.au/macintosh-iifx/

Thanks. I spent this morning checking continuity and all is confirmed with the schematics. The only thing that is incorrect that I have found is with UG1 pins 11, 13, 15 & 17 don't go to RP7, but go to RP8. I also have a battery bombed Mac IIx board and double checked. UG1 Pin 11 goes to RP8...

Bummer, I have continuity on UC7 pin 6 to RP4 pin 14. i must have a different broken trace. Still looking. I've had other repairs I've been working on, but I will pick this up again this week.

If you have not already recapped the analog board/power supply that would definitely be your issue. I would also check the solder joints and reflow all the pins that have a connector cable that plug into. Since you have it open might as well clean and re-lubricate the 400k floppy drive. Best...

Nice.

Progress today. I have a steady green light. Previously I wasn't getting 24v anywhere on the printer. I 68kmla member Joe Ventura provided me with a replacement AC Power Block and I purchased a replacement DC Power Supply and the printer finally woke up. On startup the printer attempted to...

Thomas will do a great job.

Unsure where you are located, but Amiga of Rochester (NY) does great work and specializes in recapping and repairing vintage boards. The price you were quoted will be just the recap, not for any unseen issues. Since you haven't opened it up yourself there may be other problems, including PRAM...

I installed the Top Cover Interlock switch today on the DC Power Supply and I am still missing the 24v power circuit. Tomorrow I will install a new Triac on the AC Power block. I am reading good steady 80 ohms. On my other AC Power block I was getting random readings. Thankfully parts are...

Thanks for the suggestions. I have replaced the AC Power block and recapped the daughter board with the green 22uf leaky capacitor. I have also recapped the DC Power Supply, the High Voltage power supply, The DC Controller PCA and the IIg Controller Board. I was able to get the two red lights...

Wowza! I have two battery bombed boards and would love to try transferring my good parts onto a recreation board. I was never able to get past the Death Chime on them. I'm guessing internal layers were damaged near RAM bank A from a combination of battery and capacitor vomit. Incredible work.

I'm guessing recapping the power supply(s) next. I found this great old Apple Service Training video

Last year I bought a Mac II and the owner gave me a LaserWriter IINT that had been sitting for decades in his basement. It's very clean, just dusty. I bought a LaserWriter IIg controller board and recapped it and installed it in the printer. At first I got a no paper flashing light with the...

This gives me new hope. I put the PowerBook aside because of the frustration. I will take a look at the vias this week. Thank you for the assist.

I have two PM7100's one with the G3 card and one without. Both of them has this same issue of no chime, no video on three motherboards. This last occurrence happened when I upgraded the RAM. I replaced the old RAM and still nothing. My workshop is in my basement so not much chance of static...

The PM7100 is a huge pain to work on. I have three PM7100 boards all with the same issue - no chime, no video. This one has a Sonnet G3 card, but I remove it to add the standard video card. Yesterday on my working PM7100 it booted fine before shutdown and added new 32mb RAM to bring it to...

I bought a couple of these sets for my Mac IIx a year ago. They are great, but I would place some solder onto the pads to give them some extra thickness to connect to the socket. I wasn't able to boot until someone suggested the soldering trick. It's just that the PCB's are thinner than the...

Here's a YouTube tutorial on how to jump start the Mac II

It is possible to "jump start" the Mac II's to bypass the startup circuit on the motherboard when trying to figure out a startup issue. I made my own using a AA battery holder (similar to the link) with the two wires attached. I soldered on some alligator clips. You just need 3v, touch the...