I think I was chasing my tail on the transformer, when i connected it back and checked the voltage it was reading 5v's on both 5v lines... i don't know ac that well at all. I dumped my file last week https://drive.google.com/file/d/0ByWBJRdMFXAzcGtieEplZ0t1ejA/view?usp=sharing checksum …

OK wtf am I doing wrong? I just unplugged the transformer and tested continuity between gnd and the 2 12v on it when the power is on, and its showing a short... i did the same with the 2 5v and it does not show a short... also both 12v show about 16.281 give or take. on the 5v side, one is showing …

very warm, then goes cold after a min or so.. so i was poking around those two chips and i accidentally had my dmm set to continuity and it beeped when it was on the 5v! I was like what?? so i tested down on the power board, when the power button is on 5v and 12v have continuity, -12v does not... so …

Yep reset is 0v when off and 5v "4.943" when on, tested at pin 1 cpu, pin 54 on custom sound generator chip, pin 20 on the ic 11, and pin 65 on ic 27. Side note the Custom sound generator chip gets really warm. Thank you for the reply's on this.

Crap i totally forgot that it might be adding that load, I was just thinking well the other clock works with it.... It is a crystal with caps, on the oscilloscope it seems to be real close to the right mhz, its hard to tell with my old analog scope.. here is a link to the pdf I am using, http://www. …

Ya I went through again and cleaned the smd caps one last time testing conductivity on each trace on the capacitors all checked out good. I believe what the lcd is displaying is what happens when the unit cannot boot up correctly. I checked the 5v, 12v -12v and test rails they seem to all check out. …

Good question shock, On the Main board all of the smd capacitors had residue next to them and the solder pad looked dull gray and cloudy. http://s19.postimg.org/ixxrgui33/image.jpg this is a pic of some one else's but the top cap shows what i saw on every cap on the main board. also on the analog …

Hi all, Took a logic probe to some of the main board today most of the ic's I tested checked out but I did find some odd ones. IC 16 and 21 were acting odd, using a logic probe on ic 16 pin 6 gave me a low pulse and on pin 2 its output; gave me just a low. according to what I have been reading this …

Thank you for the reply raymangold, I completely agree that it would help! I have setup a thing on ebay to tell me when one pops up for cheap. funny thing is another unit with the exact same problem is up there right now, I thought about buying it but that seemed silly. I did say that I checked the …

Quick update, I bought every electrolytic capacitor and replaced all but the output caps and still no change. So I think I'm left with bad traces or a bad chip somewhere. 🙁 guess I will start with the chips should be easier then the traces?

well today I checked the eprom and there was data on it but i have nothing to reference it to. if anyone knows of a location for 1.01 rom i can cross reference with mine to make sure its correct that would be cool. I went through and double checked all the replaced capacitors to make sure they had …

Your right, I tried my hand at google.co.jp and google translate. first post I got was the identical problem i'm having. Using google translate, I understood that there was a main cap on the analog board that ate away a trace from the test point back. I tested mine and yep no connectivity. so i put …

Thank you for the reply keropi, I checked the solder joints on the headphones and the front panel everything looked good, pushing the volume knob in does nothing. I did reflow as per your suggestion as it was a good idea, but eh still nada.

Hi all I have some questions. I did not notice a repair section for hardware, did I miss it? If so please throw this in there. Now that that's out of the way, I just got in a roland sc-88. it has a few scratches and dents but overall looks ok, but it is non functional. http://s19.postimg.org/ …