Kenwood KAC-X811D Current issues - diyAudio
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Old 21st September 2008, 11:29 PM   #1
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Default Kenwood KAC-X811D Current issues

Ok here is my problem in a nutshell, MY trunk is uneven when my spare tire is in making my power wires pull out well while in the process the positive contacted the body of the amp and blew part of the board (a little part that had a line of solder on it) well i opened it up since no warranty and found this i ran a new bead of solder where the old one was it fixed the problem, a couple days later my battery was dead. come to find out now my amp draws current constantly even when shut off. btu the weird part is other than that my amp works fine. i dont know why its drawing current when off but it gets hot if left hooked up. when i remove the power i can here something click.

plz someone help me fix this i cant yet afford a new one and dont wanna have to unhook it everytime i park my car for any period of time.
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Old 22nd September 2008, 01:58 AM   #2
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Q80 may be shorted. You should not read anything near 0 ohms between any of the legs of Q80. If you do, you need to remove it from the circuit to check it. Do this with no power applied to the amplifier.
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Old 22nd September 2008, 02:50 PM   #3
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Im kinda new at repairing amps and everything so im still learning what and where things are. i beleive i found what you were talking about and i get resistince between all the legs.
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Old 22nd September 2008, 03:42 PM   #4
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Can you get to Q79?

If so, check it to confirm that there are no 0 ohm connections between any of its legs.

If you haven't read the basic repair page (link below), you should do so now. It will make this process easier.
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Old 23rd September 2008, 06:26 AM   #5
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no i cant even find the Q79

some more info i can tell you is that the resistance between the power and gorund inputs is when my red lead is hooked up to positive and black to ground it read out at 60K ohm but when i connect them backwards red to ground and black to positive i get 0 ohms a direct flow but it only does that in one direction.

take ur time to think it out some possibilties cus im going out of town till thursday.
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Old 23rd September 2008, 02:17 PM   #6
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Q79 should be within ~1/4" of Q80. It's a surface mount transistor. The base and emitter are marked on the image below. The 3rd leg is the collector. Measure the resistance between the emitter and collector (no power applied to the amp).

You can't use your meter to measure resistance with power applied. The voltage on the circuit will skew the readings.
Attached Images
File Type: jpg kenwood811q7901.jpg (33.4 KB, 30 views)
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