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Old 30th December 2011, 05:07 AM   #1
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Default PIONEER GM-X624

THIS AMP DOES SOME WIERD STUFF..

THE AMP WILL POWER UP FOR ABOUT 5 SECS THEN THE POWER LIGHT STARTS BLINKING VERY FAST AFTER ABOUT 30 SECS THE POWER LIGHT WILL REMAIN SOLID AND THE AMP WILL POWER UP FO 5 SECS THE THE CYCLE REPEATS..

I REMOVED ALL OF THE OUTPUTS TO TEST THEM WHILE OUT OF THE AMP I TRYED POWERING IT BACK UP AGAIN AND IT DOES THE SAME THING..


WHILE THE AMP CYCLES I TRYED TESTING THE 494 AND ALL OF THE VOLTAGES ON ALL 16 PINS PULSE UP AND DOWN WHILE THE AMP IS DOING THIS

ANY IDEAS??
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Old 30th December 2011, 05:11 AM   #2
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Is the voltage pulsing on the B+ and ground terminals?
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Old 30th December 2011, 05:23 AM   #3
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No
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Old 30th December 2011, 06:23 AM   #4
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How much is the voltage dropping when it pulses?

IS the voltage pulsing on both the collector and the emitter of Q660?
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Old 30th December 2011, 06:29 AM   #5
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On pin 8 it will drop from 13.88 volts to 0 volts pin 4 will drop to -.68 volts


If i take the rectifiers out of the amp it will stay powerd up

Do not see a Q660

Last edited by mike49504; 30th December 2011 at 06:56 AM.
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Old 30th December 2011, 08:04 AM   #6
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I'm guessing that 4 and 8 are on the 494.

Reinstall the rectifiers and measure the DC voltage across the emitter resistors for each channel. Do you read anything more than 0.000 v DC on either channel?
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Old 30th December 2011, 10:14 AM   #7
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Found the problem R646 (10 ohm) resistor was bad
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