Can I Repair a Faulty BEHRINGER DJX700 DJ Pro MIXER
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- čas přidán 25. 07. 2022
- Here we have a lovely looking BEHRINGER Pro Mixer sent in by Matt. It has a few audio problems. Can it be fixed?
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Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things. I do love fault finding and trying to fix broken things, so I hope that comes across in this 'Trying to FIX' series. Many thanks, Vince. - Jak na to + styl
I always love to see how far you've come. Been with you since the beginning yelling at the screen to try to help you. Now you have become so competent at electronics I don't even yell at the screen anymore.
😂👍 Thank you
When you were saying that the mid potentiometer on Ch2 was affecting all channels, it actually wasn't affecting them.
The noise was purely contained on Ch2 only.
The reason you heard it when you were using the other channels is because you had all the faders up, thus allowing any audio from each channel to be routed to the Master and heard.
Had you only used one fader at a time (with the Master fader up) then you wouldn't have heard the Ch2 problem with the Ch2 fader turned all the way down.
Exactly what I was thinking no need for the turn button swap and I'm sure he left the top centre dead spot turn button with one that was a non dead spot turn button great soldering though
I have grown to love the sound of someone doing the dishes in the background while Vince fixes stuff.
The faders will be a logarithmic range not linear, as logarithmic adjustments tend to be used for audio.
Not tend. Always for this, because human hearing is logarithmic.
It's Sunday....according to the bike tyre!
Thanks for another enjoyable video, Vince!
The mid-range tone control on each channel will be an "active bandpass filter" using the V4580 low noise op amp with some Cs and Rs around it. I guess there was a dry joint on that pot which caused the opamp to produce rather a nice-sounding oscillation.
Yeah, that was pretty much my guess as soon as I heard it. It's one of the most common faults on mixers after crackling pots.
My son was a DJ in a local working mans club, a drunk girl came to the decks to request a tune.
Her double Gin and Tonic went all over the mixer, luckily he could carry on with the gig by bypassing the mixer.
It took me hours to clean out the sticky mess from all of the pots and sliders etc, even then it was never 100% again.
But these Behringer mixers are well made and so easy to work on
BTW on the left and right channel leds, there is always a difference on the levels.
To check the accuracy of the led meter, put the same sound source into both L and R channels, they should show the same at the same slider setting.
Once more another gteat vid.
Ray
Another good job vince! Part of my job back in the day was repairing this type of stuff. Used to work for a company supplying DJ equipment to pubs / clubs such as amps, speakers, mixers, karaoke systems and DMX lighting systems. On another note I just did my first xbox series x repair video the other day if you want to check it out!
As a dj its was great seeing you fix that mixer. I used to sell those djx700 mixers like hotcakes when it first came out, wasn't great but a cheap alternative to your djm-600. I don't even know how many mixers I threw away from the same issues you fixed here.
Question
I have one djx700 but no master sound. Not even the leds are working.
All the channels except the master sound. I have signal on each channel I can hear it. Using my headphones. But no master. Any thoughts? TY in advance
I have a Studio Master 1508 behind me whilst watching this. The previous owner (several years ago) spilt a full pint of beer all over it and blew both amps and seven channels went down with them. most op-amps blew on the seven channels and the main amps were in a mess but it is all fixed now. Not sure what it is worth but it is really powerful and quite rare these days.
MMV the Mixer Fixer! Another great video, although it did make me buy some low melt solder half way through. That stuff seems super useful! 👍
Cheers Steve. It is very useful and you only need the smallest bit. I've become converted to the stuff after not touching it for over a year 👍👍👍
My guess is that there was a solder bridge somewhere on that pot, the second you manipulated it, it created a feedback loop (output bridged back to input). When you desoldered it, you fixed the bridge and the fault vanished. :)
Maybe but at 18.47 the soldering om that pot does not look great on some of the pins , 2nd, 3rd and 4th look a bit dodgy , maybe the move and new solder did the trick
But that would of been in manufacturing and I assume it worked from new.
I think the dust inside the slider was partly the issue, the slider to track contact was going open circuit so the signal path was open and no control over the gain on the floating input.
Most mixers use op-amps for the signal path and op-amps open loop gain is huge, so if the gain was not being controlled and a floating input signal, it would go into oscillation.
Without examining the schematic its tough to determine for sure what the true cause was.
Never expected to see a mixer on your channel but it's actually got me in the mood to fix some faults on my well used DJM600 after putting it off for months, cheers!
One of the best mixers I ever had, now got their djm250mk2 that I don't use all that often, just over a year old and already has crackle on channel 1 upfader.
Not bad at all. Good to see equipment like this not go into the garbage and get repaired.
Cheers Shawn 👌
TBH, Behringer stuff is affordable stuff, not the highest quality. A lot of their stuff is clones of other peoples stuff.
This is why it's always a good idea to keep hold of your old stuff that you use when you fix things like Vince does one day those things will come in handy and you never know when you'll need them.
They are dual gang pots - you're working with a stereo signal. To keep the levels from the left and right channel tracking as you move the pot they actually put two pots on the one shaft, and they turn in unison. :)
Thanks Dash 👍👍👍
I have to say that usually the faders and the potentiometers are the most found issues on the Behringer mixers. I bought a DDM4000 a few years ago and the gain potentiometers started hissing when i was turning them. Since it was under warranty i sent it in for repairs, they repaired the the gains but i had volume issues with one of the faders, they ended up replacing it under warranty
Loving this channel - I bought an Alto drum pad to fix off eBay after watching your channel. Will be making a start on that when I have a week off in August
My favourite mixer that I use with my Numark ndx 400s.
I maintain / service a few bands equipment in my area and those Peavey 20 plus channel mixers take quite some time to service ..... Hundreds of pots and sliders on those , you did Matt a great service on that one ...
I think I have figured Vince out. As I hear the dishes in the background, he only fixes this stuff to avoid helping cleanup after dinner. ;)
Hi Vince, good to see you back on the feet without covid. Also what may have "fixed" the potentiometer was the fact that you pulled the cap off and it moved stuff inside.
I've had a few of these "dunno what I've done to fix it" fixes.. The low-melt solder is often like magic and VERY useful.
Glad it's working. Just a couple of points. When connecting a mixer & amp you should always turn the amp on last; then, when turning off, you should turn the amp off first (good practice is also to turn amp volume levels to zero before connecting or disconnecting). This prevents the loud pops (and potential damage to speakers). I'm not sure 5 pin components were potentiometers; didn't get a great look at them but from what I saw, they appeared to be rotary encoders.
Cheers SG👍👍👍
Yes I worked in a theatre as technical manager for three years and the number of times bands would pop amps and speakers because they put a channel to maximum and then plugged a guitar in... One band that came in did just that and the house amps went into protect so I put the masters down and I told them do not touch anything and went off to reset the amps I then came back to find they had turned everything up and did it again needless to say there was a lot of language....
Stereo pairs into each pot
The Whoooop whooop whooop sound is a nice effect for a DJ set ;)
Great seeing so much different repair items on this channel.
"I am working on limited tools here because all my tools are in the Rolls Royce" Wow, Vince has really changed! the fame has gotten to him 😁 Love the video as always, hope you're well m8
I used to have this exact mixer. They're excellent quality builds. His pioneer one is a good one too. You can use isopropyl on these, it won't wipe away the markings. They're painted on. I'm doing a Gemini 626 as we speak.
I was expecting the usual crackle from the knob on channel 2.. i was NOT ready for the Ooo Ooo :D
😂👍
I have had many mixers during my time as a dj. I even had a Behringer at one time. The slide faders are notorious for cutting out. I think I had to replace 3 or 4 of them at one time or another. Sometimes switch cleaner worked, but not for long.
It was a very interesting video. I've been round mixing desks and mixers all my life. I thought the problem was feedback or howell round but as there wasn't a mic plugged in it couldn't have been. It's a real skill to be able to beat match, there are computer programs available that do it all for you, that way you could mix like a pro.
The timing is impeccable.
Im in the middle of repairing a Peavey power DJ rack mount amp.. and your fixing a mixer :D
The first mixer i ever used out live. So many memory's :)
Great video, I love fixing things without meaning to, that's why I always give them a good whack before trying anything else.
I'm not sure if you already meant this by referring to different input voltages, but I think the key difference between line in and phono is that line in is buffered with something closer to a unity gain op-amp while the phono buffer has a gain of some magnitude greater than 10 with some additional passive filtering before entering the actual mixer. This would explain how a resistor could be blown out by treating a phono input as line in.
Also I think the rotary potentiometer is either a double track or double tapped component, and by swapping them you may have gone from a broken track/broken points between taps to a totally fine one, and perhaps even the original IC dealing with the broken pot dealt with both track while the bottom IC that you swapped it to only needed one.
The tone you're getting could be two things imo. It was either a downstream effect or, (and perhaps more interestingly,) an oscillation resulting from a failure mode of the IC due to having a vital path of resistance floating/open.
Thank you so much Vince I have one of these and i had some issues with it which is very similar to the issue you had with your faders. Hopefully i can repair mine.
The solder gun and braid struggled because the ground planes are large on this PCB - they soaked up the heat before the solder can reach the melting point. Sometimes you can get away with holding the heat source on the ground plane pin for longer but you can damage the PCB (warping) or component. A larger desoldering gun like the Hakko FR-301 helps but can still run into challenges on multi-layer PCBs and larger ground planes.
Cheers Stephen 👍👍👍
Tempo Difference is the difference between the BPM of source 1 & source 2. When beatmatching you need both sources at the same tempo so they stay in sync during the transition.
Time Offset is how far behind or infront the beat of your target is from your current source, it basically tells you if you need to pull or push the target vinyl/cd to sync it with the source.
I had a similar with my mixer the Mid would make a buzzing sound turned out just a cold solder point. Mixer's are well built everything can be replaced or fixed easy.
Nice one Vince. I agree the problem was either a dirty/dry jointed potentiometer, which you fixed when you desoldered/resoldered it. One comment did you check the value of the two pots you swapped over as they may not have automatically been the same value. Also that muck you scrapped off the pcb at the start may have been slightly conductive, due to liquid ingress. Causing feedback or oscillation in the op amp.
Generally Phono inputs are 1-2mV, CD inputs up to 1V and tape decks 250-500mV. If you put a CD into a phono input expect at least extreme distortion or damage to the first amplifier section. Nice job though.
The squeal is feedback, or overdriving the input of the main stereo output. There are gain stages, each step along the way adding or removing signal. One of those pots had a short causing it to go into clipping. These consoles get banged around, beer spilled in them, dust and moisture. Heating may have burned off some volatile residue. Spray some fader cleaner in them and work them back and forth.
Thanks Tiporari👍👍👍
Accidental cleaning IMO. Good fix/clean and TY for showing us this kit
Hi Vince, Variable Resistors or controls, sliders or rotary, come in two main types Linear or Logarithmic.
This means inside the control the tracks resistance will change at either a linear or logarithmic rate.
So a Linear control would be at half the value in the center but not so for a logarithmic control.
The controls used to have printed on the side either LOG or LIN to indicate which type they were.
There is a good reason for the difference in the controls, our ears or hearing is logarithmic in sensitivity, our eyes and sight however is linear in sensitivity.
So historically Volume controls are normally Logarithmic and Brightness controls Linear.
Historically this is a good rule of thumb BUT as controls are now often controlling digital devices they are not necessarily going to follow those rules.
So Vince, I hope this helps you to understand why a control may not show half the value at the center point of its travel.
I enjoy your videos, but from time to time I feel the need to pass on a few tips.
By the way, I used to work for BT around 1980 to about 1992, I worked at one of the Birmingham locations.
I now live in the USA and I'm retired but still enjoy repairing things and also have a CZcams channel.
Cheers and Good Luck.
Was about time we get a normal try to fix video... i love the car too but i love those ones even more
Thanks, after the summer there will lots more blue mat videos. I just need to get as much done on the car as possible while the sun is shining 👍👍👍
@@Mymatevince i understand. I love the car videos dont get me wrong. As long as there is a vince video long enough am happy. You helped me understand that i love fixing stuff myself. You started it all for me. Dreaming to be abke to do this job now
Hi vince great to see you back you looked well down after the car paint problem good to see you back in your element discovering the wonders of circuitry cool to see the inside of a mixer I've never seen before very interesting video well done 👏
Cheers Bazzler 👍👍👍
Thank you. I literally have the same problem (channel 2!) on my Behringer DJX 900. I wanted to avoid desoldering the pots but as i see it can really collect some dust due to zero protection.
Good lord that audio distortion 🤣
Love you videos Vince
There’s a deoxit “Fader” for potentiometers, to avoid damaging the carbon layers, you should probably get some, I’m not sure how much it really matters, but better to be safe!
Yes, I will get some. It will last for years as I will rarely use it. Sounds ideal for stick drift on game controllers as well 👍👍👍
Very nice piece of kit.
it could of just been dry solder joints and reflowing them did the job to fix that sound it was making good job well done.
The Master Quest for the before fixed Robin. Good work. My guess would be a bad solder joint or dirt, but I'm not sure. The Mixer is very interesting indeed.
Awesome video Vince! Glad you got it working a lot better than it was when it left me! Channel 2 was odd - I don’t recall it doing that before, the Left and Right problem did used to occur intermittently like you saw too though. Absolutely no idea what was going on with Channel 3 - I had fiddled with it all manner of ways and got no output. Gremlins in the system for sure! It’s got a new lease of life now though. I was too scared to have a go at fixing this myself. Tons of features on this and I was a bit daunted - maybe because I didn’t want to break anything else with it being quite a complex bit of kit - you seemed like a pro with the volume mixing by the end if the video in anycase. You should give beat matching a go ;) Thanks for another great video - was great to see the insides of this mixer.
Thanks Matt, maybe it can be a revisit video if the problem reoccurs. It is a lovely piece of kit, looks well made and easy enough to get into to repair. Cheers for sending it in as it is something I wouldn't have thought to buy on eBay. Really glad you enjoyed it 👍👍👍👍
Just rewatched the video and feel I’m obliged to mention, try to keep the channels out of the red during any / all playback. You could blow a speaker with the wrong audio tone blasting through it on full ;)
@@ianr4362 I can have a bash for sure :)
Ghosts in the machine is my explanation. I enjoyed that vid thanks
Best way to get all the knobs off is a tea spoon. And just lever them 👍 good video
Aloha !
Awesome video. I learned a thing or two again.
I am so happy that the Rolls does not interfere with the 'normal'' schedule. Mind you, I love the Rolls series.
Also: Ýou should put that WOOP WOOP sound on a T-Shirt for your merch !
Cheeeeeeeeeeeeers
Jecepede
DJ Vincey Boy on the MICRowave
😂I like DJ Vincey Boy...In a different life I could have been looking at a club full of ravers rather than a burnt stained blue mat!
@@Mymatevince haha trust me it isn't the glamour it's made out to be, full of drunk men thinking they're a badass mostly 😂
@@TheCod3r 😂👌
Awesome fix =D I wonder if there was a bad solder point relating to that pot that was giving a squeel - or a bad connection on one of the connectors you re-connected later? I am sure others will point out - Try and avoid using the regular deoxit on pots and faders - they have carbon tracks and it can deteroriate them (apparently)! You can get "Deoxit Fader" I think, especially for them. That said, I bet it will be OK - I've used it on faders before and they still work perfectly - so how much truth there is in that I am not sure, but I always get people pointing that out on my channel!
Cheers for the info Chris, being a fan of DexoIT I will look into the fader version 👍👍👌
@@Mymatevince Yep, the fader F5 version has a lubrication in it to help protect the carbon tracks. I know it's another expensive can of stuff to have around, but it's the right stuff for the right job.
Nice Video Vince the loveley sound was a feed back problem in one of the amp stages in the mixer on channel 2 possible cause it some modern op amps are biased using dc voltages and they couple with out using capacitors in some stages like in differential amplifiers if one of the resistors was open or shorted it could cause positive feed back creating the sound when you heated things up you put the resistor right and fixed the problem it could also have been a rouge capacitor with a bad connection . part 2 our hearing is logarithmic 3db in change is about the smallest change we can detect with normal hearing so audio controls for volume are almost always logarithmic in change. if you are working on a phono graph they employ a bias of the sound to remove noise so recording is not flat the phono imput will remove the bias and return it to flat. fun stuff excellent work mate
The reason the slide potentiometer is not '50' in the middle is that it's an audio component so will be a logarithmic taper (type A) rather than a linear taper (type B).
Yeah, well said - beat me to it!
pretty great for doing smooth transitions..... /sarcasm
I thought while watching: where is the cow image when using the soldering pump? Ooops wrong channel 🤣
Love the MOTU!!
The 5-pin potentiometers look a lot like quadrature encoders that short/open pins in an order dependant on direction of turn.
Good job mate.
you get two old forks to get dials tops off. also a note audio volume is not liner 10W - twice as loud 100W - four times as loud 1000W
Nice fix. Hopefully my faulty mixer will be a simple fix like this without having to replace any components
My guess is a feedback loop due to either a "metal whisker" or a "cold solder" which was repaired when you de-soldered the components and then replaced them with each other. 12voltvids regularly will just re-solder a component points on the circuit board without replacing them and that solves a very high percentage of the equipment fault he encounters.
The slider is for audio, so it will be in a log scale. Hence 50k is not in the middle. 😊
Oooh - you should've played some Epidemic sounds through it, you'd be allowed to play those without a copyright strike - DJ VInce in the house!! :)
Yes, 2 lots of talking didn't really work very well😂 Cheers for letting me know about the spammer, banned and reported 👍😎👌
tip to clean the slider use isopropyl on the track and an ink rubber is fantastic to clean the contacts
nice video , The reason for the 6 pins is that is it's a dual pot, one set is for left channel and the other set is for right channel, same as the fader you cleaned, My only concern is that you swoped the 2 pot around, The 2 pots may seem the same but are the values the same ? I would think that the values would be different for the different frequencies ( mid and low frequencies) It could have been a dirty pot that caused the op-amp (ic15) to oscillate, last thing the fader was up on that channel and you would hear it on the output
Thanks AR, I should have measured resistance on the 2 dual pots when they were unsoldered to check. You always have the answers, thanks for watching and sharing your knowledge 👍👍👍👍👍
Great video vince as alwaya
glad for shout out to dave on toy polloi, my other fave fixer...
Nice fix Vince. For instances like this would be great to hear music and can use royalty free stuff, same way that TechMoan does. I believe there are even tracks supplied by CZcams
I had a few of these mixers, they get you out of trouble for a while, but they always seem to develop these problems. Must be done to cheap parts. I had some advice from a sparky, who specialises in dj equipment, and he said the are not really worth the agro for a few reasons , part availability is apparently a problem. My one at moment has no output on headphones and every Chanel has interference , or low volume. It must be the switches and potentiometers, as these see the most use. I need to save up for a pioneer
I’ve got the same brand mixer. Nox303. I’ve noticed mine is low on one Channel randomly 🤔. I’ve not got to the end of the video yet so I’ll see if you find a cure Vince 👌🏻
the behringer was sort of a budget decent mixer, im surprised the crossfader hadnt gone its usually that what goes first. those lights above it are for beat matching. most dance tunes have a 32 beat cycle. was a good view this video as my brother used to have this model. to be fair when i saw what your fixing i thought you had bitten a bit to much off but as usual you surprised me. good job....(edit) if i remember right there was a pioneer mixer nearly exactly same as the behringer but at double the price.
Yes yes Vince I have one of these in the loft :), some DJ stuff instead of the Rolls lol :)
Being a behringer it's probably capacitors, done a couple of those brands and caps were causing some funky faults..
You should learn how op-amps work. Amazingly simple and the perfect analogue IC. Real life are not the theoretical ideal op-amp and when the feedback resistor network (which includes those dodgy pots) goes out of spec you end up with positive feedback multipliers and it turns into an oscillator. Nothing wrong with the op-amp, but the dodgy pot gave this interesting effect.
Those fader style potentiometer are very prone to dust build up due to the slot being open, I’ve fixed a fair few over the years.
Thanks Scott 👌
Probably already been mentioned that Behringer is far from 'professional' equipment. It's a cheaper version of more high end gear. P.s you're more than welcome round for some DJ'ing lessons 😄
My mate Vince drives a Roller and has Morrisons Wheat Biscuits for brew😂
Is your workspace shared with a diner? Every video you can hear the sound of dishes clanging in the background. It's kind of charming.
By the looks of it it the channel two and master slider might have worn out or have dirt on the carbon tracks only came across one similar to that. The general fix is to replace the slider for a new one if the gold contacts is bent or broken or the carbon track is gone that what I would usually do
Hi vince! Very cool video there! 👍
One tip on measuring resistances, don’t take the vales under the resistor to serious. It just means the component needs to have that amount of resistance, but combined with other resistances in paralel can offset your measuring value, which is totally fine. If you just have one resistor, of 100ohm, you will measure 100ohm, if you have two resistors in paralel of the exact same value, in this case 100ohm, you will measure half the resistance, 50ohms in this case. Gues what the resistance will be with 3 of the 100ohm resitances, 33ohm in this case. On 3times a 333 ohm in parallel will measure 111ohm just to make another example.
On different values of resistors you need to calculate them thru, but remember this as normal for reading an offset value in measuring resitance in a circuit compared to the component specification. Hopes it will help you😀 there is a forumula to calculate the total value of a circuit consisting out of different parallel resistors. Resistors in series you just ad them together to their each respectively and possible paralel path.
I hope you already found out about inductive load in AC systems and their inductive resistance. Dont take a low resistance all to serious in ac systems as well. If you measure a tranformer of coil.
Keep up to good work🙂
Yo vince, I forgot to tell, if you ever measure parallel resistances, expect to see a lower readout then the lowest resistor used in that circuit. This might hint you directly if a measurement could be legit or not.
It was a bad solder joint, look back at the footage where you were messuring the resistors. One of the pins had a hole. Simply resolder would (has) fixed the problem.
Those behringer mixers suffer with bad up and crossfaders.
The other guys DJM600 was probably one of the best mixers I've ever had compared to the newer ones, really full sound on vinyl as they had decent pre amps in them.
I've got to agree, I had the DJM600 back in 1999 and with my 1210 Mk2's they were the best bit of kit I've ever had.
no, djm600 is not good sound-wise (muddy high, so-so mid) , but fair build quality and excellent repair/parts service is available
very cool video
hi you never need to go any where with the buffer audio ic's if they are playing up they over heat
very likely it the pot logs i worked on alot of tascam 30 line and tascam 234-8 decks and the da88 units
Hook it up with the Fairlight studio part of DaVinci Resolve... you can use your PC to generate the various audio channels using a dedicated PCIex sound card, wire in a synth and knock out some tunez :D
That’s for having a rave vince woo woo 🤣
Hi Vince
Looking at your when you were comparing chip numbers 22:23 the top pin of the pot ( by resistor r13) looked like it may have had a dry joint , may be worth looking at your footage ? So when you swapped them you could have cured the dry joint by resoldering the pots
I do like the Rolls Vids , but it’s great to see some blue mat stuff as well
Hi, I've got 1 of these with a couple of faults, effects section etc, is it economical to repair?
Vince mate, there are plenty of royalty free bits of music you could have used to test this. Wintergarten are good.
They can be funny things and get a lot of moisture in them mainly beer lol but the sliders should be zero half an inch to a inch from the bottom depending on the model and the top potentiometer is gain so theirs no middle ground compared to the high mids and lows on the others and your right if phono wasn’t grounded properly it would have an effect on the channel and the stereo capacity giving more on one side than the other but mainly due to grounding issues
#51:00 I think the left channel is slightly higher volume because the MASTER BALANCE knob isn't quite set to the middle.
Not sure if anyone spotted but there is some "sound leak" on channel 1 (look at the volume leds of channel 1) I think this is due to bad quality filters
I love watching your videos Vince your getting so dare I say it Professional ha ha ha :)
Hey this is why you needed that multimeter
A lot of old mixers that connect via ribbon cables, simply need to have them reseated.
Possibly part of the fix here.
I had a tube radio that would squeal when I turn the sound down. Turned out that the volume pot was bad and it would go into oscilation. Could be something similar but dirt related?
Stereo sound isn't equal, especially on audio recorded on some home video. The mic is only going to pick up what's louder going into the video camera microphone which may be either on the left or right side depending on where the camera is positioned to the speaking person. Monaural audio is equal all the time because it's one mic channel splitting into two both equal. Funny you posted this as my Denon DNX500 dj mixer took a crap on me after 14 years. They are very expensive top replace and they are not made to be 19 inches horizontal anymore to fit into my dj coffin. It's not easy to find a mixer anymore. So the parts are also not available for this mixer. I did find the main board on ebay for 70 dollars and I was sure that would fix the issue. I ordered it and replaced the board with the new one and then there was still issues. There are 3 boards in my mixer. I was shit out of luck. I had to find a used mixer for sale online. My worry was what conditions it was used in and how many hours it was used for. As it is, my mixer was taken care of and lightly used. It seemed to be a common thing for one of the channels to give up working. The channel assign is what crapped out. There wasn't much info on line about this but a few people had posted they had the same issue with that model mixer. The new used one I bought works well .....for now.