Question about Rockford Fosgate Punch 401S Car Audio Amplifier
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Posted on Jan 02, 2017
those are likely "chips" or "integrated circuits". can you read any words, letters, numbers off it? if it's a common off-the-shelf chip you can buy from mouser.com or digitek.com, AND if you know how to de-solder and solder delicate electronic components using a hot soldering iron WITHOUT destroying them or the adjacent components. if no identifying codes on the chip, maybe google up a schematic of the board (unlikely) and figure out what it is. if it's a proprietary chip made Rockford Fosgate, it will be harder to find. Also, there could be damage to OTHER components that may not be visible, so if you go to all this trouble it might still not work and then you'd have wasted money. hopefully you are under warranty and RF can repair it. otherwise, chunk it in the nearest trash can.
Posted on Mar 06, 2007
SOURCE: 401s Rockford Fosgate Amp. Not
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause. If the fuse protecting the amp is too large, if the protection circuit doesn't respond quickly enough or if the power supply is poorly designed, the power supply transistors may fail. If you see a lot of black soot on the power supply transistors (near the power transformer), the power supply transistors have failed. Soot on the board doesn't necessarily mean the transistors have failed. Sometimes, technicians don't clean up the mess from a previous failure. Transistor Failure/Checking Transistors:
In general, when a transistor fails, it will either short (common for output AND power supply transistors) or open (common for power supply transistors). Transistors act like valves. They control the current flowing through a circuit. A shorted transistor acts like a valve that's stuck open (passing too much current). In the case of an output transistor, the shorted transistors tries to deliver the full rail voltage to the speaker output terminal. If you've ever seen a damaged amp that pushed or pulled the speaker cone to its limits when the amp powered up (common on some Rockford amplifiers), that was almost certainly due to a shorted output transistor. When checking transistors, you most commonly look for shorted connections inside the transistor. You do this by using a multimeter to look for low resistance connections between the transistor's terminals. Note:
I used the terms short and open on the previous paragraph. A short (short circuit) is a path through which current flows that should not be there. An open (open circuit) is a break in the circuit.
These repairs are best left to a repair tech familiar with car audio amplifiers. Check with your local shop to get a reccomendation. If the light isnt even coming on, chances are your input or power supply has been taken out.
Posted on Jan 01, 2009
the problem is mostly with your audio side of the amp. i have a 800 Rockford punch series amp hooked in series running at about 15 vdc at 2 ohms stable for now. but the amps left front power side transistors overloaded and smoked out, i will be replaceing my mosfets soon. Now on that side your issues apear to be related to the signal side of the amp. when you hooked the amp up tell me breifly did you hook the rca inputs to the back of the sterio and did you select the proper rca inputs for the amp? also note that amps have a potentiomater that can be tuned up or down to allow the volume or wattage to go up or down threw the system. if it's turned all the way down you'll here nothing. but often you'll get a pop sound or quickly see the speaker move a bit. this indicated the signal side of the amp has signal comming in but no output, just look for a turnable small screw inside the amp top or side. and turn up acordingly. note: to much output will damadge your system. not just the amp. ;)
Posted on Aug 28, 2009
Hi my names Josh. I see you want put your rockford amp in. Assuming you have your factory radio you have some wiring to do. But first you need and amp kit it wil have the necessary wiring you will need in it to wire your amp to your car. You will also need a line level converter they you can pick on up at best buy other wise known as a pac converter. This will alow you to transfer the high level frenquency your radio puts out to a low level frenquency to go strait to your amp through a pair of RCA's thus giving you sound to your amp and then to the sub. Your wiring will consist of the ground which you will have to ground off the vehicles chasis no more than a foot from your amps designated location. Then you have you power 12v which is about a 4 gauge wire and will be fuzed and ran strait to the positive side of your battery and last will be your remote wire. Your amp will have a place marked remote on it that is strickly for you to wire to your radio/ignition source for powering the amp up when radio is on and powering it down when it is off. YOU MUST ISOLATE THAT WIRE with a 12 volt tester it will be the wire that is tied in to your radio to power only when your igniton is on and when you turn your key it should tell you if you know how to properly check for this wire. wants you istolate this wire you will want to tie into to it and then of coarse run it and tie it into your amps remote power again it will be marked remote on your amp. From there all you have left is tying in your line level convererter.. This takes some patience as you must make sure that you do isolate your sound left and right postive and negetive front and rear channels the line level converter will tie into either your front or rear channel but caution you dont get them mixed or you will not have a signal at all. Again my names Josh and i hope you are able to get it hooked up okay.
Posted on Mar 07, 2010
plug your ground, battery, and remote wires only and see if it turns on when you turn your radio on, if not it must have blown. wiggle or move the connection block(where your wires are connected) and see if it tries to turn on. if so, your leads need to be re-soldered since they tend to go cold(they're not making good contact). But again, if that does not help, then your amp is gone.
Posted on Mar 18, 2010
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