Question about Kenwood KAC-9152D Car Audio Amplifier

1 Answer

Won't turn on

Information: -2x Rockford Fosgate HX2's in 4ohm load wiring -Kenwood KAC-9152D Amp -4ga. Power/Ground -16ga. remote Problem: Alright, this amp WAS working for a good while on my old setup, which the only difference was a box. At some point, one of the wires on the sub's coils came loose (due to someone not putting it in the clip properly), and it started making a fuzzy noise, but still worked ok. Up until one day, my amp just wouldn't turn on. Eventually, the box just fell apart (shoddy construction, this was a second hand box), so I pulled the system out, pulled the power fuse from the wire, and just had the components floating around in my room. Eventually, I got a new box, rewired everything, and hooked it all back up into my car, only to finally remember that my amp will not turn on. I pulled out my trusty DVOM and my power probe. Full battery voltage in, ground is good, and the remote wire is also sending 12.6v in. So everything is in order. I checked the amp fuses again, JUST in case. All good there. I've opened up this amp before just to do a trace check when it first went. All the traces are good, no burns on the components. What in the world could be the issue?

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  • mikerocsuall Mar 16, 2008

    Got the same problem with my Kenwood KAC-8102D, the amplifier has gone into "protection function" its in the manual. I can not get my amp. out of this function and neither can this other guy, any help out there?

  • Clint Bruck May 01, 2008

    I actually ended up rebuilding this amp. It now works perfectly.

  • Clint Bruck May 01, 2008

    I rebuild this amp. It now works fine. :D

  • Anonymous May 21, 2008

    on, wont put out sound.

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  • Kenwood Master
  • 1,689 Answers

The output devices (IC's), and their respective drivers are damaged. It is very likley that some of their support components may also be damaged.

When there are intermittants and or shorts on the output of these amplifiers, they are very easily damaged.

The amp will require proper shop service done by an experienced tech.

Jerry G.

Posted on May 01, 2008

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Larry T
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http://www.cybersoundsaudio.com/cybersounds/vehiclepics.html

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Usually, protection mode is caused by one of these conditions:
  • Shorted speaker outputs.
  • Speaker output shorted to ground.
  • There is an internal issue, causing DC voltage to be present on the speaker outputs.
  • Amp overheats.
  • Ground connection is insufficient for amp or HU.
I'm not sure of the history or symptoms of your amp, but those are the reasons why the amp could go into protection mode.

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Does it shut off for a couple of minutes or a couple of seconds? Is the amp hot when it shuts off? Are you sure you have the speakers wired to an acceptable ohm load for the amp? Have you measured the voltage at the amp (across the B+ and ground terminals) to make sure it's not dropping too low on hard bass notes?

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use a multimeter to check for power on the +ve wire, could be your fuse, it only rus a sec when you jumper the remote to +ve because the remote cannot give out the nessary current to run the amp.

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