Metroid Posted October 28, 2011 Report Share Posted October 28, 2011 Hello all, I'm a long time lurker, I read a lot, haven't really posted anything on here until now, but I'm stumped and I'm pretty noobie when it comes to electronics. I built a mb 6582. I've got the baseboard finished, or at least, all the parts are soldered on. When I turn the thing on, nothing works. I can hear the static of the sids getting power, but I can't upload the firmware or anything like that. I've been measuring some points around the baseboard, and I'm getting some weird results. At J1A when I measure voltages with the switch off, here's what I'm getting Pin 2 is reading 5.21 volts When I test AC, I get 9 volts ac. When I flip the switch, I'm getting Pin 2 2.3 volts Pins 1 and 4 9.9 volts When I measure for 5 volts anywhere else on the board it's giving me -.45 volts. That's at J3 as well as J4. Both 9 and 12 volts at J4 are testing at 7.09 volts each. J25 is giving me 12.49 volts. I have no clue what to do from here, I've disconnected all sids, didn't change anything. I've measured the voltage at V1 and on the input side of things I'm getting 13.42 volts, output I'm getting 10.38. Here's hoping somebody knows what they're doing, cause I sure don't! ~Chris Quote Link to comment Share on other sites More sharing options...
orange_hand Posted October 30, 2011 Report Share Posted October 30, 2011 Hi, you can use the following to check the voltage: If the voltage is not correct on these checkpoint, you have to investigate further.. Cheers & good luck orange Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted October 30, 2011 Report Share Posted October 30, 2011 Hi Chris, Which PSU option you are using? For the PSU option B the V1 cannot share the same heatsink with V2 and V3 ! Or you can to isolate it from the heatsink. Regards, Janis Quote Link to comment Share on other sites More sharing options...
Metroid Posted November 1, 2011 Author Report Share Posted November 1, 2011 (edited) I've tested for voltage at all of those points and it isn't even getting past the plug when I turn it on, when I turn it on there is a huge voltage drop at 5 volts right at the plug. The 9vac is working just fine when I turn it on however. Currently I'm not using a heatsink on the voltage regulators for that exact reason, I wanted to make sure that I didn't cause any weird issues, I am using psu option b though. Also, I discovered that when I flip the mobo upside down I can connect to it and all of the voltages are correct now. I have uploaded the firmware and everything, played notes and it's working pretty well. I'm pretty sure it's one of the two major filtering caps that is causing the problem, but I've reflowed solder to the whole psu section and it's still having the same issue, it only works upside down, I really don't know what else to do, I've also reflowed solder to all of the plugs. Also, from playing it I've discovered a new issue. I'm using sidv2editor to play it currently as I don't have a control panel yet. When I play it I can't turn up the volume all the way, when I try to it gets really really quiet. It's happening on all of my 8580 sids, but it doesn't happen on my two 6581's... I'm super confused right now :S Any ideas? EDIT: I just figured out that it was a problem with the power cable from the commodore 64 that was causing it to not work when upside down, so I got that fixed. Now I plug it in and it works fine right side up. One time when I started it up I got correct volume from all of the sids, but I can't seem to replicate that event. It happened when I was jiggling around the power cable to get it to work. Right now the volume on my 6 8580s is quiet, and even more quiet on all left channels. Right channels are a bit better, but still bad. My 6581s are kind of loud, the volume almost works, but changing the volume fades between the two sids, so I can only have one channel loud at a time. There is also a ton of static in the background, way more than there should be, my 6581s sound quieter than my 8580s... The first issue seemed to be a power supply issue, so I think that the power supply may just be bad. It is supplying 5.26 volts after all, when it should be supplying right around 5. Edited November 2, 2011 by Metroid Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted November 2, 2011 Report Share Posted November 2, 2011 Also, from playing it I've discovered a new issue. I'm using sidv2editor to play it currently as I don't have a control panel yet. When I play it I can't turn up the volume all the way, when I try to it gets really really quiet. It's happening on all of my 8580 sids, but it doesn't happen on my two 6581's... I'm super confused right now :S Any ideas? It's normal, thats a known issue with the 6581' s . from the wikipedia pages: "...Due to imperfect manufacturing technologies of the time and poor separation between the analog and digital parts of the chip, the 6581's output (before the amplifier stage) was always slightly biased from the zero level...". Regards, Janis Quote Link to comment Share on other sites More sharing options...
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