Recent content by mitchW

I now double checked, and this cap list is actually for a 2005 ALS G5 17 inch model, not the original one...

Original cap list for 17-inch G5 (original model): 24x 1800uF 6.3V Chemi-con KZJ 10x16mm 5x 1000uF 16V Rubycon MCZ 10x16mm 2x 1500uF 4V Chemi-con KZV 8x16mm 3x 120uF 16V All those (except 120uF ones) need to be ultra low ESR types. And max allowed height is about 17-18mm Btw, did anyone replace...

Just got myself a real nice condition PowerBook G3 Lombard, that listing said it just powers on to the question mark. Of course I thought, perhaps it is a problem with the HDD as usual. So I decided and bought it. The HDD was actually not the problem, it was the previous owner that replaced the...

Anyways, I found the problem and actually repaired it. One of the lines (ENBL1) from the IWM was reading just 150 ohms to ground. On the other board, this line measures about 3M ohms! As it passes through the RC filter (FILTER2 / 115-0002), I figured I should first isolate it first. I sucked the...

Thanks, but I don't see any values of the resistor packs in this PDF. It mostly covers analog board repairs / upgrades. I did find schematics for 512K board and I am including a floppy controller part here. Any suggestions what I should measure first?

Yes, 1.4MB floppy does work in Mac Plus, but only as 800K drive. The original cable has a red stripe, but previous owner cut the 2 lines (pin 9 and 20), so essentially this converted it into yellow strip cable. But if I am not mistaken, this modification was only required for some early 800K...

I am having an issue with my recently restored 512K. That 512K was upgraded (RAM, SCSI, Mac Plus ROMs, etc.) - so it is essentially a Mac Plus., but I am not sure if upgrades are the culprit. Original 800K drive was beyond repair (bent heads), so I managed to find and repair a 1.44MB drive...

Thanks! I checked my parts bin, and I actually have 18 of 41256 ICs (not tested though) and a 74F253! Other missing parts, I can order :) But now I found some photos of the fully populated Dove MacSnap 5.0 on ebay, but it seems it has and additional snap connector for one chip on top of the...

Here, I snapped few pics of the card :)

Thanks, I did use a special "gentle" rust remover cleaning product that I usually use for corroded stuff and it turned all green corrosion into dull grey metal. I will try white vinegar if it will make it any better

I am restoring a Mac 512K with a 512K Dove MacSnap 5.0 RAM Upgrade card + SCSI. This upgrade card brings the Mac RAM to 1MB. But I've seen some other Dove MacSnap RAM Upgrade cards that contain 1MB or 2MB of RAM. Is it possible to upgrade my upgrade card to 1MB or even 2MB? Also, one of the...

I got my Mac Plus this way. A 120V unit was brought over to Europe and plugged into 230V. If I remember correctly, it blew one of the 100uF 200V caps and a fuse. So after 5$ of parts, it was all happy again (with step-down transformer of course). I did end up replacing both 100uF 200V caps and...

Hey can anyone please provide me with the value for the R36 NTC inrush thermistor? Thanks

I also replaced UC3843 on mine, but it didn't help. Possibly it was also fried.

If you have +5VSB and nothing happens when you connect it to the PS_ON pin, then it could be the LM339 chip - it was dead on my PSU. Also worth checking all diodes and transistors for shorts. YMMV