JBL amp, worked fine untill 2 days ago. protection light is on (red) then the blue light, witch is the power on light is blinking every 3 or so seconds. fuses r ok and all the wires are intact from when it was working. Any sugestions? I was bumping the system and it just cut off, the rest of the car speakers work fine, its just the amp. Maybe blown subs?
Might have roasted your speakers voice coils a little which may be sending the amp into protect mode throw a speaker on it that you know works and if it doesnt trigger the protect circuit then you probably have a blown or almost sub.
Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Might be inveating in a new pair of subs. .A thumbs up would be greatly appreciated if this answer is helpful to you.
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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Thank you for the response. I will check all that out soon. It is freezing outside and I have not been able to work on the system. Hopefully 1 of these days comming up is warm enough for me to spend a lil time on it. Thanks again for your help. I will repost once I try it and will let you know what the problem was...
If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible causes, do the following. Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still shuts down (goes into protect mode), the amp almost certainly has shorted output transistors and will need to be repaired. If the amp only shuts down when it's driven to relatively high volume, you need to confirm that you have sufficient power supply voltage. With your multimeter set to DC volts, the black meter probe on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red probe alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts on either the B+ or remote line, you need to check the wiring feeding whichever line is too low. If 'both' the B+ and remote turn-on lines are low and your battery is fully charged, you may have a bad ground connection.
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