Who has overtaken this company ? and from where I can order schematics ?
The only URL's I find are this:
LEM Audioersatzteile - gem-lem-service
Generalmusic Promega 2+
But nobody can help there.
Best thanks for an advice in advance.
The only URL's I find are this:
LEM Audioersatzteile - gem-lem-service
Generalmusic Promega 2+
But nobody can help there.
Best thanks for an advice in advance.
Attachments
Last edited:
Have a word with Thomann. They supply them.
Looks like something from the 70s. Obsolete I expect. Still can't be complicated being old school.
Looks like something from the 70s. Obsolete I expect. Still can't be complicated being old school.
What Jon Snell said.
Beautiful visually but old as pyramids (early 70´s, same thing), never digitalized, only paper schematics way back then, impossible to find.
But that´s not the point.
Even with a full schematic and service manual you will go CRAZY trying to repair it.
Mixers are VERY complex (the understatement of the year) at an interconnection level.
Forget "bad parts" (as in resistors, capacitors, transistors, etc.) , each and every jack, pot, switch and internal connector will be dirty/rusty/oxidized/corroded and drive you crazy.
Cleaning might make , say, 40 pots "usable" out of 80 ... still unusable as a mixer.
Add to that 30 or 40 jacks, similar amount of switches ....
Even if it were new: not an XLR connector in sight, way back then cheap mixers like this one used stereo jacks for balanced input (IF they were balanced that is), no modern Pro microphone uses that so you will need to make up to 18 custom XLR to Plug cables.
It shows a multi pin "snake" connector for a multiple channel (4 channel or more) , very expensive cable to bring mic signal from stage and send back power amp and monitor drive.
There IS a reason somebody gave it to you for free or you found it at a pawnshop for 20 Euro, sorry.
Again: "Electronics" might work flawlessly (which I doubt), "Mechanicals" wiol drive you crazy.
Plus multiple stickers show it has seen heavy road use.
Beautiful visually but old as pyramids (early 70´s, same thing), never digitalized, only paper schematics way back then, impossible to find.
But that´s not the point.
Even with a full schematic and service manual you will go CRAZY trying to repair it.
Mixers are VERY complex (the understatement of the year) at an interconnection level.
Forget "bad parts" (as in resistors, capacitors, transistors, etc.) , each and every jack, pot, switch and internal connector will be dirty/rusty/oxidized/corroded and drive you crazy.
Cleaning might make , say, 40 pots "usable" out of 80 ... still unusable as a mixer.
Add to that 30 or 40 jacks, similar amount of switches ....
Even if it were new: not an XLR connector in sight, way back then cheap mixers like this one used stereo jacks for balanced input (IF they were balanced that is), no modern Pro microphone uses that so you will need to make up to 18 custom XLR to Plug cables.
It shows a multi pin "snake" connector for a multiple channel (4 channel or more) , very expensive cable to bring mic signal from stage and send back power amp and monitor drive.
There IS a reason somebody gave it to you for free or you found it at a pawnshop for 20 Euro, sorry.
Again: "Electronics" might work flawlessly (which I doubt), "Mechanicals" wiol drive you crazy.
Plus multiple stickers show it has seen heavy road use.
I had once a LEM power mixer in repair with a broken trafo. No schematic and no info on the secundary voltages.
I wrote to info@generalmusic.com (not 100% sure, it's been many years) and explained my problem.
They sent me a schematic and a new trafo at zero cost.
I must say that my Italian heritage and fair Italian message whas helpfull.
So, what keep you from trying to write to the LEM or GEM factory in Italy.
Success...
I wrote to info@generalmusic.com (not 100% sure, it's been many years) and explained my problem.
They sent me a schematic and a new trafo at zero cost.
I must say that my Italian heritage and fair Italian message whas helpfull.
So, what keep you from trying to write to the LEM or GEM factory in Italy.
Success...
Phantom Power in Mixing Console
Good evening everyone.
In a similar way to what I've seen described here, I was never able to find Service Manual or Owner's Manual of a mixing console from Generalmusic, specifically a DJ Pro II model. No contact with the technical structure of Generalmusic, Gem or Lem was successful and even today I still have no solution for the difficulty that I have been having with this mixing console since I bought it, used.
The console I am referring to works very satisfactorily, does not present significant noise for a machine so old and has excellent definition but the +48 Volts function is absent on the 5 microphone inputs (in XLR) it has. And I need that.
The PSU (external) specific to this model provides + 17 / -17 volt and + 48 volt (+ 48 volt in a differently marked circuit), which I tested and which works perfectly. I deduce, therefore, that the builder's idea was to power the console with phantom power. Which makes perfect sense, due to the type of console it is.
None of the input channels that accept XLR microphone have a selector that allows me to turn phantom power on and off. Internally (on the printed circuit boards) nor externally (on the front panel or somewhere else in the console).
Only the PSU has this selector, which works flawlessly when tested on other audio mixing circuits with phantom power.
Although these +48 Volts are available on the PSU, I can't get them to appear on the XLR microphone input terminals. Each of the five microphone input paths has it's own "Mic" / "Line" selector.
Any of the gentlemen have any idea about how to solve this issue without using small external +48 Volt modules, even if there is no Service Manual for this mixing console?
Thanks in advance!
Macedo Pinto
Portugal
Good evening everyone.
In a similar way to what I've seen described here, I was never able to find Service Manual or Owner's Manual of a mixing console from Generalmusic, specifically a DJ Pro II model. No contact with the technical structure of Generalmusic, Gem or Lem was successful and even today I still have no solution for the difficulty that I have been having with this mixing console since I bought it, used.
The console I am referring to works very satisfactorily, does not present significant noise for a machine so old and has excellent definition but the +48 Volts function is absent on the 5 microphone inputs (in XLR) it has. And I need that.
The PSU (external) specific to this model provides + 17 / -17 volt and + 48 volt (+ 48 volt in a differently marked circuit), which I tested and which works perfectly. I deduce, therefore, that the builder's idea was to power the console with phantom power. Which makes perfect sense, due to the type of console it is.
None of the input channels that accept XLR microphone have a selector that allows me to turn phantom power on and off. Internally (on the printed circuit boards) nor externally (on the front panel or somewhere else in the console).
Only the PSU has this selector, which works flawlessly when tested on other audio mixing circuits with phantom power.
Although these +48 Volts are available on the PSU, I can't get them to appear on the XLR microphone input terminals. Each of the five microphone input paths has it's own "Mic" / "Line" selector.
Any of the gentlemen have any idea about how to solve this issue without using small external +48 Volt modules, even if there is no Service Manual for this mixing console?
Thanks in advance!
Macedo Pinto
Portugal
Pinto
You just have to add 2 6.1K 1% resistors to each mic input.
Check if You have one free pin on the power connector for the 48V or change them for one with one more pin, since GND is common.
Make sure phantom is applied only to the XLR's and not to the Lines when switched.
Check if there are input capacitors & the line dropping resistors for DC protection or You have to add them too.
Head over to Rua de Santa Catarina Porto for parts.
There was a shop in Póvoa near the Casino years ago, but don't know if it still exists.
You can also Try to ask Kitshop (Santos) near Tupael Porto for the mod.
Perhaps You have luck and he has schematics.
Kit Shop – Som e Luz – Shop in Porto
Check this diagram from a mixer
You just have to add 2 6.1K 1% resistors to each mic input.
Check if You have one free pin on the power connector for the 48V or change them for one with one more pin, since GND is common.
Make sure phantom is applied only to the XLR's and not to the Lines when switched.
Check if there are input capacitors & the line dropping resistors for DC protection or You have to add them too.
Head over to Rua de Santa Catarina Porto for parts.
There was a shop in Póvoa near the Casino years ago, but don't know if it still exists.
You can also Try to ask Kitshop (Santos) near Tupael Porto for the mod.
Perhaps You have luck and he has schematics.
Kit Shop – Som e Luz – Shop in Porto
Check this diagram from a mixer
Attachments
Last edited:
Why an external module if you have +48V inside?
All you need is 2 x 6k8 resistors, 2 x 10uF electrolytics and a switch per XLR input.
All you need is 2 x 6k8 resistors, 2 x 10uF electrolytics and a switch per XLR input.
I believe he has +48V on the PSU, not on the mixer.
Probably this PSU was meant for other mixers too.
In case you can not find the schematic on-line, try this:
DJ PRO II LEM Schaltbild Schematic Diagrams Service Manual Generalmusic GEM NEU | eBay
DJ PRO II LEM Schaltbild Schematic Diagrams Service Manual Generalmusic GEM NEU | eBay
Hm, forbidden?
"https://picclick.de/General-Music-DJ-Pro-II-Mischpult-Made-192616901133.html"
Not any more, I think
"https://picclick.de/General-Music-DJ-Pro-II-Mischpult-Made-192616901133.html"
Not any more, I think
Many thanks to Maaco, JMFahey and Tarzan for the comments and observations that contributed to be able to deal with the difficulty that represents not being able to use phantom power in this mixing console. And I also thank Maaco for the indication of places where there are professionals who can collaborate to solve this difficulty or commercialize components that I will need. These are places I know, since I am from Maia, although I am living in the south of this country. In addition, I am also an occasional customer of TUPAEL to supply heating elements and some components for electrical appliances.
However, it had not occurred to me that I might be able to speak to Mr. Santos, right next door. Well remembered!
This happens to those who leave their comfort zone and forget the advantages that the northern zone represents in this professional context .... my fault.
However, it had not occurred to me that I might be able to speak to Mr. Santos, right next door. Well remembered!
This happens to those who leave their comfort zone and forget the advantages that the northern zone represents in this professional context .... my fault.
I understand that there is a possibility that the PSU can also be used with other mixing consoles models from Generalmusic and as such there is no circuit to connect +48 volts in the configuration of microphone input paths in this particular mixing console. Even so, I find it a little strange that a mixing console in this range - eight Stereo line inputs and five balanced XLR microphone inputs - is not provided with something so simple.
In fact, after an analysis of the procedure that you are recommending me, it makes perfect sense to resolve this since it seems to be easy to resolve this issue and there is enough physical space to perform whatever is needed in each module. Nothing that is not possible to do even in Veroboard, fortunately.
In fact, after an analysis of the procedure that you are recommending me, it makes perfect sense to resolve this since it seems to be easy to resolve this issue and there is enough physical space to perform whatever is needed in each module. Nothing that is not possible to do even in Veroboard, fortunately.
In principle, with the information I now have, I am sure that I will not need to take the mixing console anywhere, just ask for the components and proceed with the installation in each module. I never had to do this type of service because all the main mixers I have contain P48 option. Only this one does not.
From the above, I am once again very pleased with the fellowship shown by the members of the diyaudio.com forum. I hope to be able to contribute equally in this forum.
From the above, I am once again very pleased with the fellowship shown by the members of the diyaudio.com forum. I hope to be able to contribute equally in this forum.
The mixing console in question was completely disassembled and reconditioned, now looking better than it did when I bought it in 2004. It was all stripped, sanded, took auto primer, and three layers of pearl white auto paint. In the end, it took lettering using Decadray decals and after consolidation it took two layers of auto varnish. Between each operation, I waited ten days.
The PSU has not yet undergone any remodeling but I suspect that it will soon be completely dismantled and painted, so that everything is as I intend.
I like Italian material, as long as it is robust. This Generalmusic mixer and its PSU are as strong as an armored vehicle and with a bit of luck, this mixing console will continue to work for many years, as long as I handle regular maintenance. One aspect that I found to be excellent is the quality of the Faders (they are not marked with any brand) which I disassembled until the last electrical and mechanical component for cleaning and lubrication, in a very dedicated way. Only in the Broadcast equipment do I usually find Faders with these characteristics. Very well designed product, without a doubt. They're there to last!
The PSU has not yet undergone any remodeling but I suspect that it will soon be completely dismantled and painted, so that everything is as I intend.
I like Italian material, as long as it is robust. This Generalmusic mixer and its PSU are as strong as an armored vehicle and with a bit of luck, this mixing console will continue to work for many years, as long as I handle regular maintenance. One aspect that I found to be excellent is the quality of the Faders (they are not marked with any brand) which I disassembled until the last electrical and mechanical component for cleaning and lubrication, in a very dedicated way. Only in the Broadcast equipment do I usually find Faders with these characteristics. Very well designed product, without a doubt. They're there to last!
I have some images here that I would like to show you about the renovation I did on this mixing console Generalmusic DJ PRO II. I cannot say that the work was done in the best way, but that is what I got at this moment with few resources.
In fact, the original finishing of the mixing console was in was very bad shape, due to the fact that it was not kept in the warehouse properly, in addition to the marks of a little careful use by DJs and people with no interest in it.
Anyway, I never liked the original finish of the mixing console DJ PRO II - dark green, gray and white - so this decision made me more interested in it.
Simple painting and lettering, that's what I like ...
In fact, the original finishing of the mixing console was in was very bad shape, due to the fact that it was not kept in the warehouse properly, in addition to the marks of a little careful use by DJs and people with no interest in it.
Anyway, I never liked the original finish of the mixing console DJ PRO II - dark green, gray and white - so this decision made me more interested in it.
Simple painting and lettering, that's what I like ...
