First of, thanks to all who made this project happen, this will be one beast of a machine when it will be finished and this is all thanks to those involved!
I finished my base pcb from wilba and I am using psu option A with 8 x 6582 SID`s. When checking voltages on my pcb I have 13,18 volts at J25 and I measure nothing at J3. Is this normal with psu option A or did I miss something? Every other test up until the Sid module assembly in the base construction guide measured out fine.
I measure 5V at pin 1 but when i measure ground pin from psu input and pin 2 of the switch it gives me a distorted continuity sound, pin 4 of the switch gives me a normal continuity sound. Also measuring with the ground pin from the psu input and the ground at J3 or J4 gives a distorted sound. Hope this helps.
bad switch? bad capacitor? I don`t want to take out working parts
Did you make these continuity measurements with the power brick disconnected? If not, do that. The transformer in the power brick is a wire and makes continuity beep.
EDIT: Never mind this, the 5V is regulated so there should be no short inside the power supply.
There seems to be some bridge between +5V and gnd. It could be anywhere. One thing to try is to remove the bridge at J73. That would make it possible to check if the 5V-gnd bridge is before or after J73.
Put the board in a vertical position using a heavy clamp (like those metal clamps used for wood work).
Grab one side of the component with fingers, pliers or tweezers.
Reheat the solder at the joint from the back side of the board.
When the solder has melted, gently pry that side of the component out.
Repeat for the other side of the component. The component is free from the board.
Reheat the solder again and use a solder sucker from the component side to clean the hole from solder. Sometimes it makes sense to add some fresh solder to be able to get this done.
Do not heat too much or the glue holding the copper traces will melt and the traces leave the board -> trouble!
So I looked around on the board looking for the 5v gnd bridge but I wasn` t able to locate any problems. Desoldered J73 bridge and did some more measuring; 5V pin J3 and pin 1 J73 gave good tone
;gnd pin J3 and pin 2 J73 gave sometimes good tone sometimes nothing
I also think I heated up the insert from pin2 J73 too much as it came loose a little.
Overall I think it is best to let somebody with better electronical know-how have a look at this board because I certainly wouldn` t want to brake anything else at this point. Maybe even sending this to anyone on the forum?
Too bad the pad came loose, but don’t worry about that.
Sounds like a short in the PSU part as you first expected. Might be a good idea to desolder some components there, but it is harder than desoldering the bridge. Especially the switch. Where do you live?
I tried desoldering the switch and I think a pad came a little loose there too, so I really don t want to desolder anymore stuff unless I am shure that s the problem.
Continuity on the pads between J4 and J3 are fine.
I am from Belgium but I am willing to send the base pcb anywhere to those who are willing to have a look.
Hello again. Don’t desolder anything more. I think it will be possible to find the problem now. Be careful not to bend the pads and traces that have come loose.
Check these with continuety mode on the multimeter.
He will probably hit me with the hammer on my head for saying this, as I know he has a heavy workload atm, but I say it anyway hehe. In case everything else fails I’m sure smashtv could help u locate the problem. I have a 6582 myself, but uses none of the psu components on board, so I’m not sure I can help u any better than the fine strophlex here.
Smashtv, I’m sure u read this hehe, please give me the opportunity to put on a helmet before u take out the adjustment hammer hehe.
Smashtv, I’m sure u read this hehe, please give me the opportunity to put on a helmet before u take out the adjustment hammer hehe.
Hehe helmet needs some custom “shaping”
I have noticed I got a W06 bridge rectifier instead of a W04 listed in the parts guide, but looking at the datasheet, this shouldn` t be a problem?
W06 is no problem, same part but higher rating.
There seems to be some bridge between +5V and gnd. It could be anywhere.
Keep in mind a lot of meters will beep/show a false continuity reading across a working .1µF ceramic capacitor… guess what we use for bypass caps between +5v and ground…
Seen a lot of guys chase false short circuits due to this back in the coin op days.
With the power on, only the connection between pins 1 and 2 of the switch beep. All other continuity checks fail.
I’m sure I am reading this wrong, but if not continuity checks are done only when the device is powered off (else your meter will eventually complain via smoke/fire).
Without the power on, none of them beep. I am sorry to inform you that I have been checking the continuity with the power on, a friend told me it was done that way but I guess he was wrong… On the bright side: I will never forget
If you disconnect the power supply, but leave the power switch in the on state, then you get continuety between Switch:1 and Switch:2, right? I think the PSU part seems fine after all.
