Recent content by captjon320

Hello all, I'm recapping three Mac 128k analog boards. I took the easy path and ordered the cap kits from Console 5. I am on the 2nd board and noticed that the old C6 (22uF 50V) cap has a resistor attached to it. The other two boards did not have the resistor attached and the old capacitor...

Thanks for all you help. I got both 128ks back up and running. Replaced all the chips (new are socketed) on the multiple failure board and a single one on the other. Now I have another project with a 040038 sad Mac code. I believe this to be a bad RAM chip at G7? If this is incorrect, I...

Appreciate it, many thanks.

dochilli, thanks for your help! Yes, I was planning on changing them out as a start. Always wanting to learn, can you direct me to where these nuggets of information are revealed for future reference? Thanks again

Hello all, I have two 128k boards that I’m working on. The first will bong on startup with SadMac 04919A. 04 = Memory Test-Mod3 test and identifies a bad chip or chips. A sub code of 000A sub code meaning is Line 1111 (I don’t understand what that means). Also, I don’t understand the...

Nice! I’ll give it a try.

Thanks for the input, here are some pictures. However, so many chips and so many traces. I’ll have to search for a new card probably.

Hello all, I have a Mac IIfx that has been recapped with an Apple 630-4222/630-4230 high resolution display video card installed that has also been recapped. The computer runs fine. I am using an apple color plus 14” display (M1787) and getting vertical lines on the screen. I know the...

Update one this. I actually found the tiny transistor in the bottom of the case. I soaked it in IPA, cleaned it up and soldered it back in place. Mac IIci is up and running again. Thank you community for all the information.

Thanks for all your help and also the clarification between the “Q” and “D”, I will order one up and get this fixed. I appreciate it.

Recapping another IIci board and noticed that one of the small black diodes is missing from Q3. I assume it is the same diode that is on D3, D4, D5? I need to purchase a replacement, but haven’t figured out what to purchase. Any help would be appreciated. I have attached some pictures for...

Appreciate it, I’ll take a look.

Thanks for the information, I appreciate it. Where would I find the start up circuit? I apologize about my lack of knowledge in advance.

I have had a project IIci for quite some time. I recapped it and ran it through the ultrasonic cleaner; the board looks very clean. When I go to start it, I simply get a click; either from the soft start on the keyboard or the power button. I figured it was a bad PSU, since they seem to go...

Okay, I can verify that this part from Digikey is a correct replacement part for the inductor above. RLB0913-4R7K-ND