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Old 30th December 2011, 05:22 AM   #51
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all resistors look good and i tested the transistors and diodes they all test fine..


Wondering 1 thing how do i tell if the 4427 driver is bad for the outputs ?
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Old 30th December 2011, 06:19 AM   #52
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You can compare the input and output signals.

Do you have 12v on either end or the large 2.2 ohm resistor on the narrow end of the preamp board?
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Old 30th December 2011, 06:31 AM   #53
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1 end measures 10.60 volts other end is 11.50 volts
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Old 11th January 2012, 12:57 PM   #54
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Ok im gonna order some new outputs for this amp along with a driver IC ..


Does anyone know the part number for the Driver IC ( U500)

It looks like the markings are AS4427 Just wondering if anyone knows the full part number for this IC
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Old 12th January 2012, 12:38 AM   #55
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MIC4427 or TC4427

Make sure you get the correct width (between the rows of pins). I think they make these in the normal SOIC and maybe 2 other SMD packages. I think you need the 3.9mm package.
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Old 23rd January 2012, 02:44 AM   #56
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Ok i replaced the MIC4427.. I ordered it from Future electronics the part number i orderd is MIC4427ZM..

After replacing it and powering the amp up R613 went up in smoke..


Does anyone know the value of that resistor its right next to the 7805 ?
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Old 23rd January 2012, 08:57 AM   #57
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It's a 0.1 ohm from what I can see in photos.
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Old 26th January 2012, 12:51 PM   #58
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Is there a good sub for the IRLZ34N (Q612) that also is defective. ?


Also is it normal to have only 16.4 ohms between pads 2 and 3 for the 7805 (U601) ?

Last edited by mike49504; 26th January 2012 at 01:21 PM.
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Old 26th January 2012, 04:29 PM   #59
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It's a logic level transistor so you should use a logic level transistor if you use a sub. Standard transistors are likely to overheat and fail from low drive voltage (not driving the transistor into saturation).

The regulator would probably run hot if it had to drive into that resistance. A junk board I have here reads 200 ohms without the preamp board being plugged in and 195 ohms with the preamp board plugged in.
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Old 27th January 2012, 03:07 PM   #60
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Hey mike have you taken off the pre-amp board? If so did you notice that the power terminals blocks are a about 1/8" away from the pre-amp board? And if they make contact you could have problems. Just throwing that in, something to look for.
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