My Amp suddenly stopped working on the left chanel. I took it to a repair work Shop to fix it. as per repair 2 mosfets were replaced. the amp is now giving out put on both the chanel. but as soon as i increase the volume the left channel bass fades away and voice gets distorted only at left chanel. what could be the problem. please help ?
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Re: JVC dual channel bridgeble Amp
Most repair shops offer a warranty. If you've recently had it repaired, return it to the shop to have them check it out. If you continue playing it as it is, more damage may occur and the additional damage isn't likely to be covered by the warranty.
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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 question appears under the product listing for the Dual XPA4100 but the in the text you say the amp is actually a Jensen, so it's not possible to provide specific connection information.
But most bridgeable amps can be connected to a single subwoofer and the other two channels used to drive a set of regular speakers. I'd connect the front speakers to channels 1 and 2 and wire the subwoofer to the bridge connections of channels 3 and 4. On the XPA4100, the bridge terminals are the first (negative) terminal on channel 4 and the last (positive) terminal on channel 3.
Its possible to repair, but you have to crack the amp open and prod around a bit. I found that the failure is usually in the power components or the MOSFET drivers. If you have 1 channel out, I would focus on the MOSFETS (if you dont know what they look like just Google MOSFET - they are the black 3-legged chips and are usually mounted to aluminum to disperse the heat). Some things to look for: - burnt / melted solder traces (where the MOSFETS connect to the main board) - disconnected leads (same place as above).
If you find any connection that looks suspicious, it wont hurt to re-melt the solder around the joint to make sure its a good connection.
Have the speaker checked out and if it checks good you need to take the amp back to the repair center and have them test it better. Most repair centers have a 30 day warranty on the work they perform. Make sure they know what the problem is in detail, so they know how to check it properly. But my first thought is the speaker could be faulty. You can check the speaker yourself by switching them at the amplifier. If the same speaker sounds bad you know it is the speaker that is bad. If the sound is bad from the other speaker, then the amp is bad unless it is coming from the head unit. You can also switch the RCA input jacks after that and see if the problem changes speakers, if so, the RCA output of the head unit is bad, but that is less likely.
its better to change them all. than to change 1 or 2 mosfets, bcuz simetimes it affects the other mosfets. and please check your speaker or maybe there is an resistor, capacitors, or a relay malfunctioning in that area.
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
You say you have 2 p312d2 subs. Ok so the d2 stands for dual 2homs (2 X 2homs voice coils per sub) , conecting in parallel the 2 voice coils of only one sub will create 1hom load to the amp, and if your amp is 2homs stable per chanel that means you are lowering too much your homs causing the overhwating to it.