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Old 9th February 2012, 12:15 AM   #1
timwebb is offline timwebb  United States
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Default hcca2400d

i got this amp to repair and two driver board have corrosion as well as a few caps on top. so i powered it on to get a quick look to see what was going on.the amp looks to be fixed a few times. the amp doesn't power up all the way it doesnt even put out a signal for the power supply transistors. im sure the sg3525ap is shutting down.
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Old 9th February 2012, 04:04 AM   #2
timwebb is offline timwebb  United States
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the shut down pin voltage is about 20v. i cant find whats causing it.
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Old 9th February 2012, 04:12 AM   #3
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The datasheets states that the maximum input to the logic inputs is 5.5v. 20v may have destroyed the logic section of the IC. You need to follow the circuit back from that pin to see what's driving it.
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Old 10th February 2012, 12:39 AM   #4
timwebb is offline timwebb  United States
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ok it getting 5v. there are two smd diodes labeled v. one is good the other gives no reading at all. i did not see it in a smd code book i have.
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Old 10th February 2012, 01:05 AM   #5
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You're going to have to provide WAY more information if you want help finding a replacement.
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Old 10th February 2012, 01:27 AM   #6
timwebb is offline timwebb  United States
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in the picture its d7.still dirty from who repaired last. im cleaning it up.
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Old 10th February 2012, 01:46 AM   #7
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My closest guess is a 1SS355. That's what alpine lists it as for the diode in the attached image.
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