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Amplifier is on protect and green power light does not come on and i dont have no bass what do i do or check?

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Check all connections for bits of wire that may short out, and check the way the wires are run to the sub, they maybe crushed by something they run under like a seat etc. Also your subs may be cooked. This is easily checked by carefully pressing on the sub around the the center hub with a 'clawed' hand (so that your fingers are evenly spaced and you press evenly straight inward), if you hear a grinding noise (like there's sand in it) or if the sub dosen't move at all then it's destroyed.
Let me know if this helps.

Posted on Jul 21, 2008

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No bass


could be the speaker its hooked up to . try to disconnect the sub and see if the protect light goes out

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If the protection light is lit, the amplifier probably has shorted output transistors. To eliminate other possible causes, read through the following page. Let me know if you have any other questions.

Amp in Protect mode - Troubleshooting

Nov 05, 2008 | Car Audio & Video

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Thumping speakers - no power light is on - wired correctly


the amp is going into protect mode due to something wrong in the amp or some thing in the wiring to it ooh yea if you are getting 18v power to the amp that is way to high it should not be higher then 15v if the amp is in protect mode it will not play at all.

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Amp Power light will not go on. Protection light is lit- Thump sound in speakers


It probably has shorted output transistors. To eliminate other possible causes, read through the following page.

Amplifier in Protect Mode - Troubleshooting

Let me know if you have any other questions.

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500.1 amp power lights blinks on and off


Protection mode; follow this link to get a manual for the amplifier: http://mobile.jlaudio.com/products_amps.php?amp_id=439

Below information is from the manual:

Status Indicator Lights / Protection Circuitry
There are three status indicator lights on the top of the amplifier. These are as follows:1) "Power" (Green): lights to indicate that the amplifier is turned on and operating normally.
2) "Thermal" (Red): lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-protection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal, full-power operating mode if the heat sink temperature drops back to a safe level.
3) "Low ω" (Amber): lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum impedance load range for the amplifier. When this light is on, a protection circuit engages and reduces the power output of the amplifier. The amber indicator will also light when a short-circuit is detected in the speaker wiring (this can be a short between the positive and negative speaker wires or between either speaker wire and the vehicle chassis).
There is only one condition that will shut down an undamaged 500/1v2 completely… If battery voltage drops below 10 volts, the entire amplifier will shut itself off. The green "Power" indicator on the top of the amplifier will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 10 volts. This may happen in a rapid cycle when bass-heavy program material causes a weak charging system to dip below 10 volts momentarily. If this is happening in your system, have your charging system inspected to make sure it is working properly.
For information on troubleshooting this amplifier, refer to Appendix E (page 21).

Jun 25, 2008 | Jl Audio E1200 Car Audio Amplifier

1 Answer

Goes into protect mode


Your amplifier is trying to draw too much current. Your battery doesnt have enough power to run the subwoofers. My solution to the problem would be buying a power cap with equal or more power capasity to your current amplifier. The power cap stores a high amount of current so that when your subwoofers hit those low notes that draw a lot of current, instead of taking it directly from your battery, it will use the stored current from the powercap and wont go into protect mode. Also make sure that your connections on the back of the subwoofer arent touching. If you are hitting hard bass notes and the speaker (+) and (-) wires touch, it will short out and go into protect mode. But I dont think this is what your problem is. I am 99% sure if you go with the powercap, it will solve your problem.

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Both green and red ligt or on my jensen ka3 i dont know what it means i had it working b4 i swaped my subs for some new ones and the amp dosent work now.i dont know if is because of the red light but i...


Generally, the power light is green and the protect light is red. If the protect light is on there could be a short in the wiring or there could be an internal fault in the amp.

Disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down (goes into protection), the amp likely has blown output transistors.

Dec 28, 2007 | Jensen KA3 Car Audio Amplifier

2 Answers

No audio-amp protect light come on then went


You need to check the DC voltage across the B+ and ground terminals. You also need to check the DC voltage across the remote and ground terminals. If the voltage is less than 11 volts, you need to check the B+ supply and remote wiring for breaks or open fuses. You should also check the ground connection to confirm that it's not loose.

 

If the voltage is OK, the output transistors are likely shorted.

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