Pioneer DJM 850 - Distorted input diagnostic and repair
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- Опубліковано 21 жов 2019
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In this video I take a look at a Pioneer DJM 850-k with distorted inputs on ch1 and ch2. I test Line, Phono and CD inputs and they all have problems, but setting up a laptop and using the USB source it's good so this pointed to the pre amps on the Input board. Most DJM work in this way, but the model of the op amp is not always the same.
The part I replaced is a NJM212M and they are end of life, but Mouser had stock and was very quick to arrive in the UK.
Music used in this video is by LAKEY INSPIRED and is called Days Like These
/ days-like-these - Навчання та стиль
I am adding a new rule. No help or questions answered unless it's related to the video and you are subscribed to the channel. It takes up to much time to reply and I am not free tech support.
"A farty kind of noise". This is the kind of thing I really appreciate because technical terms can be hard to find out. But seriously, nice video. Versatile, too, as it applies to nearly any mixer of this complexity.
I think this chip is on the later models with digital line select and not the older type that passed audio through the actual switch. The other chip that goes is the balanced XLR output.
Your knowledge with electronics is superb. Great video
Thank you Dj Legion! ive for years have tried to get the understanding of a amp circuit. this explained alot.
golden content, thanks man!
Thank you for the video. Exactly what I was looking for. Unfortunately just to realize that it may not be possible to swap the 'phono/Sub Mic input' for a 'Line/CD input' on my DJM 500. It seems that I would need a new input board. I was looking to turn my DJM 500 into a 4 Line in Channels...
Hi Great Vid, I have two old mixers, on both mixers one of the input channels only play on the right side, but if I crank the gain up the whole way you can hear left side slightly but distorted, would this be the same problem the preamps are f****d, I have checked with a multimeter, the RCA connectors and soldering joints seems ok
Hi DJ Legion, what a sensational video, first, thank you for sharing. Second, I would appreciate some help with A&H Xone 23C mixer.
Bought it new, and opened to connect jumper cables, to reconfigure the soundcard for using DVS option (it changes the digital audio signal route).
The mixer has 2 line input and 2 phono input, so 4 RCA's (1 pair of each for every side).
I started calibriting DVS (in the software) and from one second to the next, the phono input stoped working, the mixer seemed to reset (as lights switched on and off).
Since then I haven't been able to use the phono input for channel 3.
Thank in advance for any help
i have a problem with a djm500. is that one channel (R) comes out lower than the other. both in the master out and in the master preview the difference in volume is noted.
Great video, permanent subscriber here! I find myself with an issue on the DJM-900 nxs where one channel sounds “thinner” than the rest. To compensate, the Trim knob and Bass Eq knob need to be cranked up. Can this also be an issue the the amp chips as seen in this video?
Hi thank you for this video. It was a great help with my repair. but I have to ask what is that shinny round thing that looks attached to your head behind your ear ?
HI, It's a Titanium bone anchor for a hearing aid called a Baha. I am almost deaf in one ear and this device vibrates the skull and allows me to hear sound on my deaf side inside my head. I tried normal hearing aids, but I am too deaf for them to pass any good sound so this was an alternative solution and it works really well.
Hi,
I wonder if the beat buttons on the color effect section has something complicated under it. I want to replace my front panel but I’m afraid to open it. I’ve done it on DJM800. Is it the same?Thank you in advance!
Hi, thanks so much for this video! I seem to have the same issue with my mixer and want to do the same repair. I see that the part is not longer available but do find the ''NJM2122M-TE1'' at mouser. Would that be a good replacement? Thanks,
Hello Doker,
I am in the same situation right now, have you tried or found an answer?
Thanks in advance!
hola muy buen video ....yo tengo el mismo problema en mi djm 850 pero la distorsion solo es en el canal 4 y solo en una linea de entrada del canal 4 . donde puedo conseguir los chips para hacerlo yo mismo. que referencia debo buscar para los chips-----
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Hello
My 850 lately overheats from the bottom to the point where it is the generator and creates a sound fragment
I would like your advice
I have uploaded the new drivers program for the big sure apple and I am playing with TRAKTOR 3
Regards
Adam F
Hi, Awesome video - very informative. Subscribed. I have an very similar issue with my DJM450 Mk2 mixer I bought used recently. Whilst the phono inputs work fine for my 1210s and the USB sound in is also fine the right side of channel 1 line-in is really distorted. Do you know if it's likely to be a similar chip failure? Many thanks, Tom
sorry I never worked on one so couldn't say
hola la distorsion en mi djm 850 es solo en un
lado del canal 4 el otro lado suena bien ...
Hello,
I have a question for you.
In the 1st channel(DJM 850) there is a background noise
Do you think it can be fixed?
If yes, can you please support me with some information?
Many thanks!
Hi im having the same fault but struggling to find the chips. do u have a link to any please? thanks
from any pioneer dealer. in the uk I buy from sbsav.co.uk/shop/ or ebay.
I have a problem with the output master 1 xlr one side R the sound is quiet the L side the sound is louder , the rca master out sound good , the booth out sound good . Any help ?
it will be the balanced output driver chips for the XLR
@@DJlegionuk thank you for your answer you know where can i find that piece of the driver for the XLR - 2114D JRC for replace?
Hmm, curious about this! My DJM800 channel 4 outputs both LEFT and RIGHT when the mono selector switch is turned on. But when it goes to Stereo, only left channel is outputted via the master. Do you think it would be the RCA/Phono jack that needs replacing? line and phono both work as well.
swap the fader with one of the others first, that is easy. look at the solder of the RCA if the fader is ok.
@@DJlegionuk thank you! I'll give that a go. so far the RCA solder looks good, bought a set of new faders so I'll just replace them all together.
@@DJlegionuk update. swapped the line fader, channel 4 CD/LINE works both mono and stereo with no issues. Phono only outputs to the left channel via stereo switch and of course mono hits both left and right. I can hear a very faint amount of audible input from the right channel via phono, it has to be a dodgy RCA/Phono jack yeah?
@@BryantFC if it's missing when using phono only it could be the RCA socket or the op amp for the Phono.
@@DJlegionuk thank you very much Legion! Appreciate the help. Your videos helped me repair various 1200s and now this mixer so I'm forever grateful for your info. You wouldn't happen to know the particular part number of the op amp would ya?
hi legion, i got a similar problem with my djm 850. the sound on the ride side of channel 2 input is dead ( or very very low) when i connect a device like a cd player or a laptop via rca cable. first line channel right side dead, second cd/line channel right side dead but wenn i switch to usb both sides work. is it possible that is also this little chip you replaced in your video? i saw two chips for every channel in your video, is there one chip for left and one for the right side? and if so, is the input signal from line right and the cd/line right routed through the same chip. the other input channels are fine and like i said the usb on channel 2 works like it should too. maybe the rca connectors are damaged but both right channels on the same time!? sorry for long the text, here is a potato :)
cheers from germany
HI, in your laptop setup are you sending the audio pre fader or post fader ? I would first swap the fader with another channel to eliminate that and then I would reflow the solder on the RCA sockets. I do believe it has one chip for the left and one for the right.
@@DJlegionuk wow, that escaleted quickly. okay i will check that. thanks for the quick reply.
Hi DJ Legion, i need help with my pioneer djm 800, i changed channel 3 fader and my pioneer did not turn on again,
what could be the problem?
you broke it
@@DJlegionuk and can't it be that a fuse has blown?
@@SounderDJ1 The fuse probably blew. I had the same issue. Look at page 48 of the schematics. (DSP ASSY, CN8-connector) You see a lot of fuses there, make sure they all have continuity. It probably is the fuse on pin 6 and maybe pin1. Model numbers of the fuses: DEK1094 (pin1) and DEK1098(pin6)
is that a common fault?
I also have similar problems with my DJM 250-K.
Both Aux work fine. Both CD lines work fine too.
Phono/Line-In (switchable) are damaged on different scales.
On channel 1 the right side is okay, left has distortion with very little signal on Line.
Switched on Phono left side is dead and right side has distortion on the higher frequencies.
On channel 2 both sides have distortion with little to no signal on Line-In and a much louder but similar on phono.
Nothing on the board looks roasted but maybe my eye is not trained well enough. But could those symptoms also lead to this failure? Should be the 4580 c011f jrc chip, right?
HI, looking at the service manual and it's not the same as the 850. It uses LC78213 IC6 to process the audio. CD goes into one side direct. Line2 and phono go into the other side of the electronic switch and if the line-phono real switch is set to line that then goes to the other side of the IC6. If you choose phono it goes through a phono preamp stage. then the output from one or the other goes to IC8 for AD conversion. If CD is ok on both is could be the physical switch to choose line/phono or the digital switch is bad on this side. if both line and phono are bad it would not be the phono preamps I think it is just a single chip that would need to be replaced ic6. If you can find the service manual it gives a list of faults and parts that could be at fault. I have not worked on these before so I just looked at it to fine these possible answers.Hope this is some help, but it's not even close to the 850.
DJ legion okay.. thanks for your opinion. Will look further into it. If I can’t find the service manual in the wild: is there a place where I can ask for stuff like this? Thanks a lot and cheers.
@@needlol9194 just search for djm 250 service manual and download from elektrotanya
DJ legion ahhh. Thank you!!!
Hi Frend, my problem this DJM-3000 analog DJM-600, Master cue buttom in my headphone work only Right Cannel!!! This problem only Master cue buttom in Hedphone) switch split mono stereo working anoter cue.
I also ask you all the guys if anyone has a problem or was with master cue the headphones, write, thank you
I repaired the mixer, now the stereo sound works! the logical key (IC20) on the circuit has been replaced!
How does anyone contact you for a repair who’s not on social media?
you can find my email in the about section.
@@DJlegionuk I can’t find it anywhere mate
As someone who knows nothing about electronics I’ve always wondered what the hell is inside these things. They’re so big
Do not clean the board with IPA.. It's gonna leave residue and damage the wax layer. Use ultrapure water and let it dry thoroughly.
Are your underpants a bit tight ? you sound squeeky today :)
I have recently developed asthma and some days are worst than others. I would take the squeaky voice over constant coughing every day :)
That’s not faulty, that’s pioneer quality preamps doing their thing! lol