JL audio 300/4 driver board issues - diyAudio
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Old 1st August 2012, 01:58 AM   #1
DcMaN is offline DcMaN  United States
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Default JL audio 300/4 driver board issues

Hello, a while ago i successfully replaced all the output transistors, and got 3 outta 4 channels working. The third channel driver board has the two lights on the top out and the one off to the left on the bottom is on, but is more dim than the other driver boards. I've tried removing solder and re soldering parts from one of perry babins diagrams. But still can't get any output in the third channel. However if i bridge channels 3 & 4 i get a very low output, i also noticed when i unhook the speaker with the amp on the top two driver board lights turn on and then off really quick. Any help is appreciated.

Thanks

-Rob
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Old 1st August 2012, 07:43 AM   #2
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Check the two resistors on the bottom left of the driver board. They are marked 10R0 most likely. Are both within tolerance?
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Old 1st August 2012, 07:53 PM   #3
DcMaN is offline DcMaN  United States
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The resistor closest to the end of the board won't give me a reading, but the other resistor to the right of it reads 10.3.

Im assuming the resistor that won't give me a reading is faulty? Also on the resistors they say 100 on them.
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Last edited by DcMaN; 1st August 2012 at 08:06 PM.
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Old 2nd August 2012, 12:31 AM   #4
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That's a 10 ohm resistor. It's defective.
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Old 2nd August 2012, 02:28 AM   #5
DcMaN is offline DcMaN  United States
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I don't have any 10 ohm resistors on hand right now. I have a couple 11 ohm resistors would those work, or should i just order some 10 ohm resistors ?
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Old 2nd August 2012, 04:11 AM   #6
DcMaN is offline DcMaN  United States
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almost fixed, Channel 3 now works, but distorted output. OK at lower volumes but distorts about 20% up
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Last edited by DcMaN; 2nd August 2012 at 04:34 AM.
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Old 2nd August 2012, 05:07 AM   #7
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Did you set the bias for that channel?
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Old 2nd August 2012, 03:27 PM   #8
DcMaN is offline DcMaN  United States
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I believe i set the bias for all the channels a long time ago. Where should i position the potentiometer?
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Old 2nd August 2012, 04:23 PM   #9
DcMaN is offline DcMaN  United States
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Just tried messing with the bias a little, still distorted. Is it possibly because i used an 11 ohm resistor where there should be a 10ohm resistor ? I also noticed driver board for channel 3, the one that has distorted output tends to run maybe 5~10 degrees hotter than the rest.

Last edited by DcMaN; 2nd August 2012 at 04:44 PM.
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Old 3rd August 2012, 03:58 AM   #10
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ok not to be mean but i posted a JL 1000 slash v1 about a 3 weeks ago and you guys post this week and get a responds i have 0 responds wtf all i'm asking is a little freakin help
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