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Old 17th October 2008, 08:14 AM   #11
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If it's in the audio section, there should be an identical one in the other channel.
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Old 17th October 2008, 09:11 AM   #12
hakentt is offline hakentt  United States
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problem, digikey does not have MPSW56, only in bulk. Do you know if any other replacement that would work? And that zener diode looks like it has been taking some beating, number on it is 756 red and black color and in digikey site it shows the one that is black and has a silver strip on it?!
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Old 17th October 2008, 09:49 AM   #13
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You'll have to get the MPSW56 from Mouser.

The color of the diode isn't important as long as it has the same electrical characteristics.
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Old 22nd October 2008, 04:34 AM   #14
hakentt is offline hakentt  United States
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I got all the parts here. I took the MTX 302 appart and I see darkening of the board around one mpsw42, so I will change all the components that are around there, I hope that fixes the problem that I was having with this scope.
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Old 22nd October 2008, 09:34 PM   #15
hakentt is offline hakentt  United States
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Perry can you tell me what values are the two burned resistors that I need?

Here is the photo of the good board, the two resistors are between two circuled transistors

Click the image to open in full size.

150 2%
Warning: Non-standard 2% (E48) value. Standard E24 value. Reverse: 20M(1%)

so is it 150 or 20m?
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Old 22nd October 2008, 09:55 PM   #16
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The originals are 150 ohms. I've been using 390 ohm 1/2 watt flameproof. The higher value causes the resistor to drop more voltage so the regulator transistors run a bit cooler.

I also mount them under the board on the sink. This reduces the heat being generated in the area of the regulators.

http://www.bcae1.com/temp/IMG_6779bs.jpg

What value did you use in your other amp?
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Old 22nd October 2008, 10:04 PM   #17
hakentt is offline hakentt  United States
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cool thanks, in my other amp I did not even replace them, but my other amp am not pushing hard at all. it is only pushing one 12 inch. I don't listen to hip-hop so there is no boom boom resistor kaboom LOL
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Old 22nd October 2008, 10:10 PM   #18
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These are not affected by the way the amp is used. They will operate at the same temperature whether the amp is being driven hard or at idle.
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Old 22nd October 2008, 10:14 PM   #19
hakentt is offline hakentt  United States
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Am going to buy some of those now and install them in both amps, my question is if the store does not have 390 ohm, can I use 350ohm or 400ohm or 300ohm?
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Old 22nd October 2008, 10:19 PM   #20
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330/360/390/430 would work. Those are all standard values.
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