Powered mixer 740 was bought and the power refused to ON after we used for nine months. we took it to the point of purchase for repair. the tecnician told us that the power IC are not in Nigerria markets that we will need to condemn the product and buy another one. pls i need your advice on what to do. we really enjoy the product. secondly, we plug horn speaker to it. I want to ask is it advisable to do so.
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Question edited for clarity, full 'make model (what it is)'.
Question moved to make / model category.
It sounds like a power board or overheating issue. Find your local Peavey agent and take it in for repair. If you want to try something, open it up and look for a cooling fan and fluffed up vents.
More in likely a voltage drop in the club, and the mixers power transformer was fighting for power, so it's brunt or burning up, also there are capacitors that filter the AC transformer hum, they Probably need to be replaced, this can be fixed tho, parts and labor might not be cheap...
If the blue power light does not light up then there is a problem with the unit or power supply. As it is less than a year from purchase I would advise returning it to the shop.
Essentially if the fuse goes, the unit is rendered useless until it is repaired. Replacing the fuse without repairing would likely cause further damage in the unit. Fuses blow for a reason that is usually a failure in the unit. Failures don't fix themselves. The ability to replace the fuse is therefore a moot point. To keep your unit safe ALWAYS power all interconnected equipment from the SAME power receptacle or conditioning module. This means running extension cords to powered speakers if that is what you have to get power the mixer. Powering mixers at one end of a room from a receptacle and the amps or speakers from a recpetacle on a stage at the other end will likely damage you equipment when a ground fault occurs or ground bounce in the building wiring ruptures the sensitive input/output circuits of your equipment.
Hi, most times when you use a mixer for too long and don't service it or take it to be serviced,itmight one day develop a fault by it self..
If i may ask,when have you taking it for servicing? If never,please do..
Sometimes dust entering into a mixer can make it malfunction.....
Since you know how to use the mixer properly,you don't have problem with that ok, Just take itto a repair man for servicing and he might tell you if something else is wrong with it after servicing it..
"Tested with other speaker and cable" ... you did not tell us the results of the test. If swapping the speakers and cablles still had the same dead side, it is probably the power amp for that side and not the mixer part. Take in for repair. If you had an accident of speaker cable not being plugged in fully or pulled out while operating, this pops the power amp real quick. They also just plain fail at times. Plug a set of headphones into the MONO out jack. If you can hear audio going through the unit then the mixer is OK... and the power amp on the failing side has a failure. Note the headphones will be low level and probably only one side, usually the left as this is a mono signal and headphones are normally stereo.
Cease using the mixer until it is repaired. One or both of the amps have blown. Further use MAY result in power supply damage. 1 to 6 switching power transistors will have blown and often a Zener diode or two. If the metering resistors smoked, there will be two small surface mounted transistors per channel blown wide open as well. These are all in the HCA2400 amplifier module.
You didn't mention what brand powered mixer you have, HOWEVER MOST powered mixers also have a line level monitor and main output jacks. These are almost always 1/4 inch jacks. In any case you should be using BALANCED lines to the powered speakers using either XLR or TRS connectors on the ends. Please tell us what powered mixer you have so we can give you better answer regarding which connections to use. IF for some reason your mixer does NOT have line level outputs, you can use a high level Direct Box to condition the powered outputs to be sent to the powered speakers..
Also make sure ALL your interconnected equipment is powered by the same receptacle or source to avoid damaging due to ground bounce on utility lines and circuits. This often means running an extension cord from the stage where the powered speakers are along with a snake of the audio cables.
You haven't mentioned what model and manufacturer the mixer is. I will have to guess and say that the monitor out on the board isn't providing signal to the powered monitor or the monitor out on your board is powered and is now damaged by plugging a powered monitor into it. Carefully reread your manual and determine if the monitor out on your mixer is powered or line level. Reread also and make sure that the signal you are monitoring is assigned to monitor out, levelled correctly etc. If you find that the monitor out is passive (line level) try hooking it up to an external power amp and speaker. A guitar amp will do for testing purposes. Start with a low input volume on the amp. Also make sure that if it is passive to use a shielded cable from monitor out to input. If your board has powered monitor outs you can use a speaker cable from monitor out to speaker input (non powered monitor speaker).
The fuse protects the power supply. The power amps have failed. The usual cause is an arc between layers of the multi-layer circuit board. The labor to repair the power amp module is extensive. I have repaired several.
You can find new amp modules and I would purchase a new one and drop into your unit. The amp module is an HCA2400.
There is probably $15 of parts blown in each side of the power amp and it takes about 6 hours to repair. One has to grind out the burned area (internal layers not necessarily visible on surface) and re-insulate and then install jumper wires to replace those taken out.
Each side of the amp will likely take out 3 switching MOSFET transistors and often a Zener diode. Sometimes a low resistance metering resistor will be fried with smoky residue underneath the board. When this happens two small surface mounted resistors will be blown open. Great care has to be taken when insulating the board damage and replacement of the blown circuit traces.
You can find HCA2400 power amp module replacements for about $175 online.
Use of the unit as an unpowered mixer is a bit dangerous as if arc re-establishes it can fry the power supply taking out two very expensive IGBT's and many other components. If the mixer still works, then your whole power supply is still OK.
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