Hey guys it been awhile since I have been on this site. I had to shut down the repair shop for a while due to moving back and forth from Missouri to North Carolina and now back to Missouri. Anyways, enough with the sob story and down to my question.
I have a Rockford fosgate 501x 4 channel amp. I tested the powersupply chips and all the audio outputs and they checkout fine. I turned all the bias pots counterclockwise and adjusted them individually. At this point everything seems good. I apply a 100hz input signal and start checking the outputs and nothing. I adjust the gain and there is ac voltage for one sec then zero. The same for all 4 channels. I removed the input signal and checked for dc voltage on the outputs and boom I have approximately 27vdc on all 4 channels.
Any ideas?
Does this sound like a tl494 pwm issue?
Does this sound like a lm339 comparator issue?
any help would be appreciated
thanks, matt
I have a Rockford fosgate 501x 4 channel amp. I tested the powersupply chips and all the audio outputs and they checkout fine. I turned all the bias pots counterclockwise and adjusted them individually. At this point everything seems good. I apply a 100hz input signal and start checking the outputs and nothing. I adjust the gain and there is ac voltage for one sec then zero. The same for all 4 channels. I removed the input signal and checked for dc voltage on the outputs and boom I have approximately 27vdc on all 4 channels.
Any ideas?
Does this sound like a tl494 pwm issue?
Does this sound like a lm339 comparator issue?
any help would be appreciated
thanks, matt
Do you have both positive and negative rail voltage as well as positive and negative regulated voltage on the power supply pins of all op-amps?
Was the 27v all positive?
Where was the black meter probe when measuring the voltage?
Was the 27v all positive?
Where was the black meter probe when measuring the voltage?
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