> The amp that i got , is a mosfet power amplifier , and it is a two > channel amp. The mosfet numbers is ( 2SK134 \ J50 ) it plays but , it > play like a radio that has no aerial , when i move the gain to 3-5 it > make a distortion. If you can explain what can be the problem I > really gonna appreciated. > > Thanks > > Warren.
Your problem may be in your input rca connections not getting proper contact or in the wrong way , if the input is not rca lead and is hi end input,as in wireing off the back of your head unit to the amp it may be a short in the wireing, you will need to check all your wiring if so, also make sure all your earth leads are clean and are big enough to take the amp size.
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Bad ground sounds like you may have paint or undercoating stopping the ground from making good contact or unhook the remote wire and run a small wire from the main power to the remote hook up and see if it works ...... May have a faulty remote
Your amplifier is having a serious fault within preventing further damage to the amplifier. If could be a failure of the output mosfets, failure of the predriver, failure of the bias to the output mosfets, short inthe speakers- check this out- fault inthe error amp section for wrong current indiication or malfunctions in the mother board. All of this will need careful location of the fault by checking ont these stages. Porceed only if you are competent or seek help. Good day
ok here is how it goes power wire from the battery all the way to amp..then ground wire from amp to a good ground on car then the remote wire which you have to run from the amp to the back of your stereo which in most cases is blue then hook subs from the sub box to the amp
hafler use international rectifier hexfets. there is alot of confusion what constitutes a mosfet amplifier.
if the outputs are mosfets instead of bipolar transistors, it is a mosfet amp.
some designs are using mosfets to drive the switch mode power supply,but use bipolar output transistors.that is not a true mosfet amp.
you need to go to an electronic supplier for the repair industry.
or the manufacturers warranty depot,who will be able to order them.mosfets are very high current devices,you have to ask ...why did they fail. if they are the switch mode drivers,there is bad capacitors in that circuit
Those black things are likely the MOSFET transistors (the bits that provide the amplification). They likely look similar to these.
Your problem may be deeper than just these units being blown - especially since there are 6 that are gone. Have you been overdriving the amp? Using speakers with the wrong impedence?
Anyway, you can try www.user-manuals.com to see if they have the service manual. You could also try to source new mosfets from online retailers (eg digikey, www.sayal.com) - just read the numbers printed on them. You may also want to try to determine why they blew in the first place. I have fixed amps where one or two have gone bad because of being overdriven, but 6 makes me think that something else is wrong. Unless the am has a number of MOSFETs serving each channel. Eg, 3 MOSFETS per channel on a 2 channel amp..
As It was mentioned on the premium post, if after removing the fuse(s) from it, the amp powers up and stays ON; the failure is on the transistors or mosfets and they will need to be replace to get the amp working again on channel 4.
I would suggest to contact the manufacturers to get an authorized repair center to fix it under warranty if your amp is less then a year old.
i had afriend who is atechnician. his boss amplifier stopped working on one channel,so what he did is openened the amp,tested the mosfet transistors and it showed signs of failure.then he went shopping for same type of mosfet transistors and with no luck in buying the right type, he put the amp away for acouple of weeks. then one day he hooked it up and strangely it worked again. he told me that while it was hooked up itwent into protection mode and for some reason it worked later. so i would not open it because of static discharge i would disconnect the amp for maybe acouple of weeks then hook it back up.... its worth a try & good luck