Amp just shut down. Need help.
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=34425
Printed Date: April 29, 2024 at 4:30 AM
Topic: Amp just shut down. Need help.
Posted By: Mrhunter
Subject: Amp just shut down. Need help.
Date Posted: June 23, 2004 at 10:43 AM
Well I have a Kenwood KAC-929. I recently purchased a paid of Infinity 1232W's. I wired them up last night but wired them to run at 1 ohm by accident. (I was misinformed over the phone by a friend). Well I ran the setup for about 10 mins and then it all just shut down. I checked all the fuses and they are all intact. Did I cause any permanent damage? Or is there some kind of a protection on the amp that I am overlooking? Any help would be appreciated. Hopefully I dont have to go out and buy new subs or a new amp.
Replies:
Posted By: DYohn
Date Posted: June 23, 2004 at 11:02 AM
Yep, that amp like all Kenwood stereo amps requires a minimum 4-ohm load when bridged in mono. If you ran it at 1-ohm and it did not shut down in protection mode, you either blew the amp (worst case) or blew an internal fuse. If it did protect, then you should be able to reset it by removing the speaker load and power-cycling the amp. Then hook up no less than a 4-ohm load to it before you turn it back on. If resetting it does not bring it back to life, take it in to the dealer where you bought it for service. ------------- Support the12volt.com
Posted By: Mrhunter
Date Posted: June 23, 2004 at 11:43 AM
The "protection mode" would be the fuse links correct? And to power cycle the amp I just need to disconnect the subs and turn it on and off? By the way thanks for all your help. Hopefully this works.
Posted By: kgerry
Date Posted: June 23, 2004 at 1:04 PM
BTW, this amp has no internal fuses
-------------
Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: Mrhunter
Date Posted: June 23, 2004 at 2:21 PM
Well I disconnected the subs and turned it on and off. I also disconnected the power wire form the amp. The power light doesnt even come on. I am assuming that the amp is blown at this point? Also pulled the fuses just to double check and they all seem to be fine.
Posted By: Mrhunter
Date Posted: June 23, 2004 at 2:22 PM
Any ideas on a good amp to run those 12's. I would need to stay on or below the $300.00 range.
Posted By: customsuburb
Date Posted: June 23, 2004 at 2:35 PM
Look at this Rockford Fosgate 551X. It outputs 275 on each channel when bridged (its a 4 channel amp). Also you should look at the JBL BP-1200.1. It outputs 600 watts continuous at 2 ohms.
Posted By: forbidden
Date Posted: June 23, 2004 at 4:55 PM
DId you think to check and see if the fuse in the main power line at the battery is blown? Protection mode is nothing to do with fuses, it is a constanly running safety check circuit inside the amplifier that will interupt power and shut the amp off if the potential for damage caused by one of the circuits is present. This could be a dead short on the power line, excessive heat build up or any number of problems. Like was said above, disconnect the speaker leads and double check the fuse up front. If you have a meter, double check fro a good power / remote on and ground at the terminals on the amp. If they have power and remote and a good ground at the amp, then it is likely that you have fried the amp.
-------------
Top Secret, I can tell you but then my wife will kill me.
Posted By: Mrhunter
Date Posted: June 23, 2004 at 5:24 PM
Yeah I already checked that too. All the fuses. I just checked thwe power to the amp and there isnt any. I will have to check to see if maybe the fuse is blown down towards the bottom where I cant see it.
Posted By: kgerry
Date Posted: June 23, 2004 at 5:45 PM
get the amp looked at before you junk it... i am a warranty service centre for Kenwood and see quite a few of their amps through here that simple burn open ground paths in the power supply when overloaded.. no parts needed..... just a suggestion..... ------------- Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: Mrhunter
Date Posted: June 23, 2004 at 7:31 PM
What do you mean by that? How could I check that problem and correct it?
Posted By: kgerry
Date Posted: June 24, 2004 at 9:44 AM
take it to a qualified service center... spring the diagnostic charge to have it looked at....
-------------
Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: Mrhunter
Date Posted: June 24, 2004 at 11:13 AM
I think the amp is ok. I connected the power-ground-remote up in someone elses car and the amp powered up. So my next step would be to check all the power running back to the amp. Ill check it out and see what happens. Again I thank everyone for the help.
Posted By: shaman
Date Posted: June 24, 2004 at 6:45 PM
Take your power ufse out and check it woth a meter, it might not look blown, but it still could be. It sounds wierd but its happened to me. Then put it back in the holder and make sure it has continuity through it, if thats all good I would say your battercable is screwed up or your ground wire.
Posted By: Mrhunter
Date Posted: June 24, 2004 at 6:50 PM
Thats what I plan on doing tonight. Ill see what happens and report it.
Posted By: Mrhunter
Date Posted: June 28, 2004 at 11:21 AM
Ok well I switched the amp and subs from my roomates car. His amp didnt work in my car either. So I started checking a little bit and I think the RCA's outputs are bad on the back of the deck. I also ran some checks on the amp itself and and only only the left input channel for the RCA's works.
Posted By: Paradigm
Date Posted: June 28, 2004 at 1:18 PM
If I were you, I'd be asking your buddy for some reimbursement...
-------------
VEHICLE: 2002 GMC Sonoma ZR2
Alpine CDA-7940
AudioControl EQT x2
JL Audio 1000/1
JL Audio 10W6 (originals) x3
Kicker ZR120
Kicker ZR460
Polk GXR-6 x4
Polk GXR-4 x2
Posted By: forbidden
Date Posted: June 28, 2004 at 1:41 PM
It sounds like the amp when it was installed in your car was in protection mode. This could be due to a blown sub, a speaker wire going to ground or a rca cable that is going to ground. Most amps that are running in mono or bridged accept only the left channel rca input.
-------------
Top Secret, I can tell you but then my wife will kill me.
Posted By: Mrhunter
Date Posted: June 28, 2004 at 2:21 PM
I need to give a better description I think. I took my amp and switched it with the one in my buddies car. Only the left input RCA jack on the amp works. Only the left +,- work on the outputs on the amp as well. I took his amp and put it in my car and his amp goes into a protection mode. It wont really do much of anything. I have full power going to the amp, the remote wire has power and the ground looks ok.
Posted By: forbidden
Date Posted: June 28, 2004 at 2:40 PM
If his amp works fine in his car and not in yours, then the problem will lie in either a bad sub or subs, bad speaker wiring or bad rca cables and maybe just maybe a bad cd player (I really doubt this though). It sounds more and more like you have a bad channel in your amp that may have been caused by a damaged sub or sub wire. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: Mrhunter
Date Posted: June 28, 2004 at 6:20 PM
I was thinking the right channel was bad. But the other problem appears. Why wouldnt his subs and amp work in my car? Would running it at 1 ohm go back and damage the outputs on the HU or the RCA's? I think I need to try to pull the RCA's and switch those out and if that doesnt work then switch it to another one of the RCA outputs on the HU. If the Sub outputs are bad would it ruin the other ones as well?
Posted By: forbidden
Date Posted: June 28, 2004 at 6:24 PM
If the subs are wired together in any kind of circuit it will throw the amp into protection. If the problem is in your wiring of the subs or a bad sub or in the rca cable then regardless of the amp used, it will go into protection. It really sounds like a problem in your vehicle that is causing the issues with both amps and may infact have led to damage of your amp. ------------- Top Secret, I can tell you but then my wife will kill me.
|