Question about Kenwood KAC-7202 Car Audio Amplifier

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Working on a MA Audio HC4002 amp......

This amp comes on,shows red LED for protection mode. as it is turning on,it seams to put dc current into one channel just before it goes into protect. i want to know if its the ouputs(TIP35C & TIP36C) that need replaced or the power supply mosfets(IRFZ44N)? none of either look bad or burnt. or if i can get any kind of repair manual for this amp. email me back with any answers. thanks everyone

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Re: working on a MA Audio HC4002 amp......

On an amp? All the devices should be replaced at once as they can measure or look good, but still have a high resistive leakage, and if this happens to save a couple of bucks, you can blow out all the devices you just replaced. The thing with solid state devices? Most of the time you cannot look at them and see they are bad unless they had a total blowout and blew apart and put a big hole into itself and then yes that ones bad and beleive me most of the others are too. Good Luck

Posted on Oct 09, 2006

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The red light you describe on your amp, is the protection mode warning light. An amp goes into protect for many reasons. Here's a checklist.

1st check the fuse (s) on your amp and make sure they are not blown.

2nd check the inline fuse next to your car battery (if you have an inline fuse)

3rd, disconnect the speaker wires with amp on, does the light go off?

4th check your ground, this may be ok if you have tried another amp with the same wires.

5th.if none of these turns the protect mode off, it may be an internal fault.

you may have blown transistors and it is a tricky job to repair and costly.

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1 Answer

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1 Answer

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