Alpine 3522

warpedhifi · 22nd February 2011, 05:12 PM

I have this Alpine amp 3522 in for repair, so far found a blown channel, replaced both outputs, went to check and amp will not power up. Here are the pin voltages off the 494:

Pin 1: 3.19 volts
Pin 2: 4.90 volts
Pin 3: 0.04 volts
Pin 4: 00.0 volts
Pin 5: 1.43 volts
Pin 6: 3.51 volts
Pin 7: 00.0 volts
Pin 8: 12.85 volts
Pin 9: 5.28 volts
Pin 10: 5.28 volts
Pin 11: 12.86 volts
Pin 12: 12.86 volts
Pin 13: 4.95 volts
Pin 14: 4.95 volts
Pin 15: 0.72 volts
Pin 16: 0.03 volts

Any idea's??

Perry Babin · 22nd February 2011, 05:52 PM

The IC is producing output. Are you sure that it's not producing rail voltage?

warpedhifi · 22nd February 2011, 07:14 PM

The amp has rail voltage, -19.5 and 20.9. checked led and found a loose connection. So the amp looks to be ok, need to check it with audio and see how it goes.

22nd February 2011, 05:12 PM	#1
warpedhifi diyAudio Member Join Date: Jul 2006 Location: Denton, Tx	Alpine 3522 I have this Alpine amp 3522 in for repair, so far found a blown channel, replaced both outputs, went to check and amp will not power up. Here are the pin voltages off the 494: Pin 1: 3.19 volts Pin 2: 4.90 volts Pin 3: 0.04 volts Pin 4: 00.0 volts Pin 5: 1.43 volts Pin 6: 3.51 volts Pin 7: 00.0 volts Pin 8: 12.85 volts Pin 9: 5.28 volts Pin 10: 5.28 volts Pin 11: 12.86 volts Pin 12: 12.86 volts Pin 13: 4.95 volts Pin 14: 4.95 volts Pin 15: 0.72 volts Pin 16: 0.03 volts Any idea's??

22nd February 2011, 05:52 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The IC is producing output. Are you sure that it's not producing rail voltage? __________________ 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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22nd February 2011, 07:14 PM	#3
warpedhifi diyAudio Member Join Date: Jul 2006 Location: Denton, Tx	The amp has rail voltage, -19.5 and 20.9. checked led and found a loose connection. So the amp looks to be ok, need to check it with audio and see how it goes.

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