hcca2400d

timwebb · 9th February 2012, 12:15 AM

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.

timwebb · 9th February 2012, 04:04 AM

the shut down pin voltage is about 20v. i cant find whats causing it.

Perry Babin · 9th February 2012, 04:12 AM

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.

timwebb · 10th February 2012, 12:39 AM

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.

Perry Babin · 10th February 2012, 01:05 AM

You're going to have to provide WAY more information if you want help finding a replacement.

timwebb · 10th February 2012, 01:27 AM

in the picture its d7.still dirty from who repaired last. im cleaning it up.

Perry Babin · 10th February 2012, 01:46 AM

My closest guess is a 1SS355. That's what alpine lists it as for the diode in the attached image.

9th February 2012, 04:12 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

10th February 2012, 01:05 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You're going to have to provide WAY more information if you want help finding a replacement. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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9th February 2012, 04:04 AM	#2
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	the shut down pin voltage is about 20v. i cant find whats causing it.

10th February 2012, 12:39 AM	#4
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	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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