The rca outputs on my table are putting almost no signal out...if i turn my mixer way up then i can hear faintly...is there a soundboard gone bad?

It sounds like the issue might be with the routing of the signal from the wireless microphone to the main output on the mixer. Make sure the wireless microphone is plugged into the correct input channel on the mixer and that the channel is properly selected and turned up on the mixer.
Also, make sure that the main output on the mixer is selected as the output source and that the level is turned up to an appropriate level. It's possible that the level might be too low or the wrong output might be selected.
If you're still not getting any sound, try plugging in a different audio source (such as a phone or MP3 player) into the mixer's input and see if you can hear any sound through the main output. If you can hear sound from another source, then the issue might be with the wireless microphone or its connection to the mixer.

Why not un-complicate the circuits by eliminating the soundboard first?

I am guessing but it sounds like a gorse impedance mismatch. You should never connect two outputs together unless they are specifically designed for that. Since you are listing to mono why not send each output to the Base Amp the other to the cabinet. That should resolve the problem.

You probably blew it. It sounds like the power supply put out more voltage then needed. Also they come in AC/DC, putting AC into a DC input usually blows things, dC into an AC normally does not hurt it assuming the voltages are in range in all cases.

Here are a couple of steps you can do first before opening up the mixer & I'll word this so that it covers every potential item, (Turntables, CDJ's, Rack Mount CD Players, External Player, PC, Laptop, etc.) Obviously there are a multitude of items that could be the cause of you only receiving your RIGHT MASTER OUT since you didnt specify what item this occurs with if not all. So here's a quick legend for you to follow my references regarding the NUMARK 5000FX Mixer so here we go:
*******************************************************************************
MIC/Line Phono/CD Phono/CD Phono/CD LA/LB Zone/Booth/Rec/MSTR
LO LO LO LO LO LO LO LO LO LO LOLOLO LO
RO RO RO RO RO RO RO RO RO RO RORORORO
********************************************************************************
1. Turntables - A) If being used make sure the little black switch on the back is set to Phono instead of CD. Plug just one table in, play the record & see if there's only one side of your MASTER output jumping and make note of it. Then repeat the exact same steps for all Phono inputs (total 3) & again make note of your MASTER output signal Left or Right or Both sides jumping. This will help you identify if its just a specific channell that only works on R or L.
B) Now do the exact steps above for the other turntable & this will confirm whether or not the Phono cables went bad on the turntable or if a specific channell is has gone bad while in Phono mode.
2. CDJ's/Rack Mount CD Player - A) Now just use your CDJ's/Rack Mount CD PLayer for the next test & be sure to now change the little black switch on the back from Phono to CD. Just as the steps with the turntable perform the same for this item in all possible RCA's (total 6) & note your MASTER channell output signals L & R.
B) Now do the same for the other CDJ/Rack Mount CD Player & this will confirm whether or not the RCA cables went bad on the CDJ's/Rack Mount Player or if a specific channell has gone bad while in CD mode.
3. Audio Cables OUT - A) There are a host of ways to have your audio come OUT & multiple configurations depending on how you record &/or bounce your audio OUT. Now since you say your MASTER OUT digital meter is only jumping on the R side depending on if you're going with RCA MASTER OUT or XLR BALANCED MASTER OUT either or is what'll show the digital reader bouncing with audio so check both. It could very well have been a cable going bad on you simple as that & you can check that by pluging your cable that works on the R side into the L side. If it starts showing a reading on the digital meter than you've solved the problem being a bad cable. Also don't forget to check your ZONE, BOOTH & RECORD OUTS as well however these will not show on your digital meter so open up your audio recording software to confirm that L & R sides are working for these.
B) Last but not least double check that your BALANCE knob is set directly at 12 o'clock, this could sometimes be the culpret.

Well I hope this helps & good luck.

WesTCo@sT
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gel caps gone bad

i would say its most probally an earth fault somewear but changingt the gnd leads an rca cables might be worth a try as its defenatly not your mixer.gd luck

You didn't state if you purchased this used or new. If used, maybe the tonearm or the rca cables are bad. Or, if you set it up inccorectly.

Just to be sure...

TURNTABLE -> MIXER PHONO INPUT (CH1 or CH2) -> OUTPUT MIXER (MAIN OUT) -> STEREO INPUT (AUX IN or LINE IN).

Make sure you have the line selected properly on your receiver, and if you have a tape function, press the button in and out. Sometimes this will affect the sound. Now, check to see if your getting any signal to your mixer. Make sure the toggle switch on your mixer is set for PHONO and not LINE. Raise all volumes, including heapdhone, and see if you hear or see anything on the levels.

If all is good, but no signal going to mixer, then you might have a bad tonearm or RCA cables....

To check, disconnect the cartridge/headshell from your tonearm. Look inside the tonearm, and you'll see 4 gold plated prongs. Make sure they are all evenly protruding. Also make sure they are all a shiny. If you see any black substance on any of the prongs, they need to be cleaned. If any look like they are stuck, and not sticking out like the other ones, this would also cause an issue. This cannot be repaired. You can try to get the prong to come out, but if it does not work, you will have to replace the tonearm.

If everything with the tonearm looks good, then the issue might be the RCA cables. There is no easy way to check this, other than opening up the turntable. This is not easy, and I do not recommend.

Let me know how it turns out.

- OPTiC
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If your head unit has a separate setting for a non-fader then make sure that that is turned up and check the gains on the amp if the gain is all the way down you wont get any output. And if the gains are down only turn it about 3/4 of the way up, never all the way. If you are getting signal from both channels but it is faint, it is most likly not the RCAs or the RCA jacks. I would say it is a gain issue or a bad amp. Let me know how it goes. Good luck.
-Andrew Hawkins

This does happen. The RCA cables used on the Technics 1200's aren't of the greatest quality, and you will find lower output on some turntables. This can become an issue, if you record your sets to your PC, or you use Serato, Final Scratch, or any of the digital control set ups. There is only 1 way to resolve this, and that's to switch out the RCA cables on both turntables, and ensure that they are matched. This can be done by any qualified audio service technician. Just make sure you choose some good quality RCA cables, and not the standard OEM Technics cables.