Re: Routing power -or- BUGGER, I think I may have fried it
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Try disconnecting the rArduino module.? Also I would be Leary to plug the rArduino into my USB port until you can clear that module isn't a short. 12 V. on the main board has a connection to the P.A. and the other to the receiver connection. Maybe disconnect the LCD module and then pull the P.A. power plug. apply 12v and see if something comes up re the main board.
With rArduino module disconnected hook up the power to the main board only and see if anything goes.? Should hear the speaker noise with working volume control.
I'm suspicious of the 12-5v. regulator on the LCD module.? Mine gets extremely hot as I say finger burn hot. ?regulator should shut itself down if it gets hot.? Regulator is 7805SVC ?Data sheet is on line.? Not sure yet if others have a hot regulator.? At min. install a heat sink.
(I've been considering a pico fuse or a 20mm fuse holder/fuse- fusing the power supply lines).
The are also a few regulators on the main board.(see diagram). Check the electrolytic caps for bulges or splits on the tops. Dose your power supply have a current meter? Hope these suggestions help. Larry WA9DOH
On Thu, Mar 16, 2017 at 12:50 PM, richard kappler <richkappler@...> wrote: I'm a RTFM kinda guy, not so much a look at the pictures guy.
I finally got all my parts in, finished assembly this morning. I half expected smoke and flames (said in jest), instead I got nothing. ?
Under Step 4: Wire up the Raduino, it says solder the black wire to the DC power socket and solder the orange wire to the DC power switch on the volume control. I dutifully soldered the black to +12V.
My power supply is a little 2.5 amp rig, adjustable up to 15 volts . It works, I tested it, it is set to supply 12.4 volts to the BX, as read on both the installed ps meter and with my multimeter. When I hook it up to my BX, thankfully, it reads 0. I say thankfully because nothing seems to have happened, no readout from the LCD when I turned the volume pot on, but then again, no smoke, sparks or pops either. I turned it off and started in on the BX with my multimeter and sure enough, I had a hard ground. When measuring resistance between the hot and the 2 grounds on the DC power socket) I get a big fat zero point zero zero.
I went back and re-read the directions, it would seem I did it correctly, then I looked at the 1st picture which clearly shows the black going to ground. BUGGER. I unsoldered it, soldered it to ground on the DC power supply, checked with my multimeter, infinite resistance between +12V and ground. HOORAY!!!
But nothing happens when I power it up. Have I most likely fried it, or have I buggered up some other connection? If I've most likely fried it, I'll go order another. Thankfully in this arena stupidity only costs 59USD and about a month of waiting.
I'm hopeful that it's not fried though, as the meter on the ps, when hooked to the BX, never showed even a hint of voltage out. So... with fingers crossed, what would be the next step in troubleshooting? Can I get a little guidance here?
regards, Richard - W2KAP 
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