Low ohms lights on; Transistor Brown, replace it; low ohms light is off now and everything seems to work fine execpt when in low volume, it sounds good. When increase the gain, it hit for 1 second hard, and then goes back and doesn't hit hard no more. The sound quality is good, its just sound so weak that's it. And when installing the amp, it sparks like crazy when putting the neg in and then the pos or vice versa. Usually it sparks one time and then your good. But this time after replacement of the transistor, it's crazy all the time when put back in or out. I think its th transistor that is causing it and Any tip will help. Thank You. Oh, do any of you know where I can buy some transistor for JL Audio amp spec?
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Re: JL 500/1 Problem
You need the old transistor. Knowing it's brown is not enough; you need to know its resistance value. It sounds like the resistor you replaced with has too low a resistance value, causing the "cuts" in sound. Find the old resistor and then use this site to find out what you need:
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The first thing is to meter all the speakers with a volt/ohm meter. They should read somewhere between 2-6 ohms. If they meter good try swapping the RCA's and see if there is any difference. But if both of those check out ok than. Unfortunately it would appear that your amp has a bad output channel. What seems to happen is that when the amp is cycled off and on, off and on etc. the solder on the PCB can get brittle causing problems. The only answer i can offer is to send it to JL to repair or find a good repair shop that works on car audio amps. It's getting harder to find a good tech but they are out there. If you send it to JL they have a set repair rate of $180.00 which covers the return postage while the customer pays the shipping cost getting it there. They do an excellent job and pretty much go thru the whole board and replace not only what is wrong but will also perform any mods or changes since date of manufacture.
I would try running the subs in parallel. Pos to Pos Dual Voice, Neg to Neg Dual Voice. Then Run + to + stereo - to - stereo on both channels.
So you have + and - running to one channel and + and - running to the other channel.
Also your LPF filter could be set too high.
Usually all amps spark a little when hooked up again after a while of no use. this happen cause there are many little capacitors inside to keep the amp running when hitting long bass notes. I think the reason you have been having problem after replacing the transistors is because there not the rite model number or maybe the polarity. You mite have to call jl and ask them if they have any in stock or google the model number of the transistor and buy them and replace them and see if it work. if it doesnt work then it mite be something else inside.
If the low impedance light is on, the amp probably has shorted output transistors. If you don't know of a good local repair shop, call 'several' of the local audio sales/installation shops to see who they use. If more than one audio shop recommends the same repair shop, they probably do good work.
Assuming that you've confirmed that the speaker is in good working order and that the wiring isn't shorted in any way...
There are separate power supplies for the high and low amplifiers. It's possible that the one for the sub output has failed. If that's the case, the output transistors probably failed and that's what damaged the supply.
Generally, I'm willing to help people repair their amps but this is a large, complex amplifier and it should be repaired by a qualified technician.