JL Audio 300/2 Blown Left Channel - Page 2 - diyAudio
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Old 10th June 2011, 09:31 PM   #11
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Location: Louisiana
If you found an open resistor, you need to replace it. The large 47k resistors need to be resoldered, no matter the fault. They overheat and the solder oxidizes and creates a bad electrical connection.
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Old 10th June 2011, 09:43 PM   #12
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Understood. I was just awaiting instructions on how to proceed.

Where do I go about buying a 621 SMD resistor, Radio Shack?
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Old 10th June 2011, 09:53 PM   #13
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Mouser or digikey unless you have a local electronics distributor.

You'll need to measure it. It's likely a 1206 but I don't show a 620 ohm resistor on any of the driver board photos I have. It's 620 ohms.
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Old 10th June 2011, 10:27 PM   #14
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You are correct about the value. The 621 mentioned above is what was stamped on the body. As you know, 621 = 620 Ohm's.

I will check Mouser or Digikey for a replacement part and, while I am at that, purchase some of the other items you suggest getting on your Amplifier Repair website.

Thanks for all your help so far, until I get the above part ordered.
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Old 18th June 2011, 03:38 AM   #15
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UPDATE

Replaced the 620 Ohm resistor and unseated the two big resistors and the left channel was restored. However, the left channel did not last for very long.

I again, replaced the 620 Ohm resistor as it had again increased in value. Unsoldered and resoldered those big resistors and now have the amplifier running on my test bench. Every now and then I would take voltage readings from each channel.

The left channel reads 27.75 VAC, unloaded.

Right channel reads 27.74 VAC, unloaded.

Bench source Rockford Fosgate RFX 8140. At max it clips the inputs of the amplifier at the minimum input sensitivity on the "High" setting which is 8 Volts.
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