Search results

Ok maybe I found something. so I found that pins 37 and 38 on U5 (DFAC2) are shorted (have continuity). Using magnification I can find no solder causing the short. Going by the schematic page 11, pins 37 and 38 goto the headphone jack. So the first photo shows what pins on the jack have...

Sure, here you go.

of what?

they are the same exact jack yes.

yes every pin.

replaced the jack, no change whatsoever. I am at a loss. Its not the audio jack

yes I have checked for bridges and connectivity. the only issue with sound I have is with the audio out jack. I will have to steal a jack from my broken LC550 board (where I got the DFAC2 chip from). But everything on that board is corrosed so the jack is not going to be all that nice to look...

Yes and yes. This machine has zero sound until I replaced the DFAC2 chip.

I tried cleaning the jack several times. I know cleaning the headphone jack on my IIgs fixed a low sound output. but Cleaning this one made no change at all. Should I replace it?

So I had to replace a bad Dfac2 chip on my color classic board to get any audio. When I plug a speaker or headphone set into the audio out I am expecting to get stereo audio out and the internal speaker to cut out.. But the internal speaker keeps playing audio and the audio out only plays audio...

So I tried another cap, and replaced a 3300uf cap because it looked a bit cockeyed and the label which shows the negative post location was pretty far from where the pin was and that bothered me (who knows).. Its booting again! I just booted from and external/portable SCSI cdrom (diskman)...

Ok here is the underside of the board I circled the cap location.

I will post a photo

mine is a 106 tantalum and it looks like i had thr positive hooked up the same as yours. I will try another cap tomorrow. maybe its just a bad cap

thanks so much for that. Well that looks like a tantalum for sure doesnt it?

But what type Ceramic? There is a recap list online that lists that info but it doesnt specify what type. Maybe a 106 ceramic cap?

So let me start off saying I HAD a working Mac Color Classic. I had already repaired the board and replaced its capacitors last year. This week I was going to finally recap the Analog board. Well once I did theat the unit would not boot and had a constant high pitch chirp. After care ful...

Stand corrected: 6 layer board.. Everything else I mentioned remains the same.

The vias will be trashed. So the connections to the middle layers of the board (its a 4 layer board) will be gone. I have seen machines far less damaged still be toast. Soak in vinegar two hours and thoroughly wash with warm water and a bristle brush or toothbrush to get off the grime...

Just want to make sure the Pinouts are the same using a rom 01 schematic as this is a rom 03 board.