Question about Rockford Fosgate Punch 401S Car Audio Amplifier

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401s Rockford Fosgate Amp. Not powering on,just protect lite is on.

401s Rockford Fosgate Amp. Not turning on. No power light. Pos+ and GR- are solid. Thought it may be remote, so tried running a wire from the POS+ to REM to test it, no luck After i got my car jumped my amp has the protect lite on not power lite please help

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  • duane wert
    duane wert May 30, 2009

    thanks for reply,this model has 3 led lites top one is power, 2nd one is termal,3rd one is protect, no matter what we do,this lite stays on. this all happen after we needed a jump,the power lite will flash fiant blue at the sametime the protect lite flashes.it on for 10sec then flash,10sec flash. we disconected the speakers and the booster,still the same.we pulled all fueses as we were told too,to reset.again nothig. i hope this helps. thankyou......duane.

  • duane wert
    duane wert May 31, 2009

    am sry i will have to check. its my sons car,and he wont be home till late. thank you for reply. sry.

  • Perry Babin May 11, 2010

    Are you sure that this is a Rockford 401S?



    Rockford didn't use blue LEDs until later.

  • Perry Babin May 11, 2010

    I don't think that model has a protect LED. It only has a power LED. If the red LED is lit on the top of the amp, the amp is most likely working.



    Have you checked the speakers?



    Have you confirmed that you have a good signal at the amp?

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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

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Try hooking the remote wire to a rem wire on the back of stereo. post and let me know results

Posted on Jun 02, 2009

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Ok i just got a 401s rockford fosgate amp for my 2001 dodge and i got it grounded and power hooked up plus the remote wire hooked up but it wont respon

any suggestions?

Posted on Aug 12, 2009

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1 Answer

What is the auctual watts fpr the Rockford Fosgate Punch 401S?


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UNPLUG SPEAKERS OFF THE AMP
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401s Rockford Fosgate Amp. Not turning on. No power light. Pos+ and GR- are solid. Thought it may be remote, so tried running a wire from the POS+ to REM to test it, no luck


Amp Failure:
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.

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I think my ex blew my amp


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In most of Rockford's amps, the low voltage detection is connected to the remote input. If the remote voltage is too low and they use the same circuit on this amp, it could trigger the protection circuit.

 

Disconnect the head unit's remote from the amp. Use a fuse holder with a 3 amp fuse to jump between the B+ connection and the remote terminal of the amp. If the amp powers up, the head unit's remote output may be defective. If it blows the fuse, the remote input or part of the power supply is damaged. Do not try it with an unfused jumper.

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