Right monitor has stopped working, left still works

A bad ground connection?. Try tightening the nut on the phono plug first. You can pull out that section where the cable hooks into and visually check the solder connections.

On the rear of the piano there will be two 1/4" jacks labeled Output Left and Right. One will be labled Mono as well. If you are using a stereo amp, use both, and if a mono amp use just the mono output. If your amp is a guitar type, connect a shielded cable with 1/4" phone jacks such as you'd use with an electric guitar from these jacks to your amplifier. If you are useing a home stereo amp, you will need a cable with 1/4" phone jacks from the piano to RCA phono jacks on the amp end.

Sir Barry..
The easiest first option is to clean all metal contacts accessible from the outside.
Depending on your location, aerosol products such as Servisol, McKenic, and Kontakt may be available from electronic retailers.
I suggest the non-oily, quick-dry evaporating type.
As phono-plug sockets etc are exposed to humidity, oxygen, etc they can oxidize, creating a thin film over the metal.
The contact-cleaner sprays zap the problem.
Failing that, open cover, remove dust, roaches, rats, cat-hair, etc and spray any plug-sockets / switches/ buttons/ connectors.
Unplug/ re-plug freshly-sprayed connectors to help 'scrub'.
Any connectors should be firmly seated.
Sometimes, they can 'creep' loose over time.
As for 'worth it', if it needs repair, your electronics repairman could hopefully give a rough quote if problem is apparent.

You don't say what cables you are using. If you are not using balanced cables (TRS) this is probably your problem.

What you've done should have worked on the video input. The phono will not sound like you'd want. Have you made sure the mixer is working correctly by trying it plugged into a different amp using the same outputs and cable?

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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Plug in one a at time using the same input. Take the left speaker and the left input wire. Plug the wire from the mixer into the one speaker if it sounds ok then unplug the speaker and replace it with the right speaker. If it sounds ok replace the wire with the right wire. This will tell you that each speaker is working and each cable is working. If you switch speakers and they sound different then the possibility of a blown high end driver in one. If they sound ok each by it self but the high end suffers when they are both hooked up then the possibility of the speakers might be. Not sure what the sub has to do with the whold setup. Any further questions call me at the store.

Vito Vacirca Jr.

Pro Line Music

490 Lincoln Highway

Fairless Hills Pa. 19030

215-736-8055

[email protected]

[email protected]

www.prolinemusic.com

Have you connected the Left speaker to the right speaker using the supplied cable? If not, connect the cable to the socket on the back of the right speaker labelled "to left speaker" and on the left speaker, to the socket labelled "from right speaker"
If this still doesn't solve the problem, try swapping the input cables (put the white plug in the red socket and vice versa) to see if this makes the left speaker produce sound, if it does, check the connection at the source to check the plug(s) are in all the way. If there is still no sound in the left speaker, unplug everything and do the following:
connect the left and right speakers with the supplied phono lead (Probably black) between sockets labelled "to left speaker" and "from right speaker"
then connect the source to any of the inputs on the back of the right speaker (ensure if using the red and white phono inputs that both are connected)
finally plug in power source.
Hope this helps

Yep! Get a decent audio interface that attaches to the PC with a USB connection and uses BALANCED lines to your mixer. I use a UA-25EX Roland/cakewalk as an example. (about $200 and there are cheaper units such as M-Audio Fast Track MKII ) Note these interfaces BOTH record and playback with two channels for stereo.
Essentially the audio board that is in PC's and Laptops are too near the switching noise of the processor and some of that is just bound to get into the audio lines as they don't even have balanced audio lines from the computers. Make sure you use either TRS or XLR balanced cables from whatever interface you get. Also connect ALL interconnected equipment to the same power source or receptacle. You can try to reduce the buzz with the mixer EQ's with what you have, but that sacrifices audio quality.

Hi, post on mvnation.com, they will be able to help.