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Infinity Reference 475a
Infinity Reference 475a
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Old 16th January 2019, 07:15 PM   #11
PapaZBill is offline PapaZBill  United States
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Join Date: Oct 2013
Location: Yale, Oklahoma
Assuming you replaced D4 or anything else you may have removed, clamped board in chassis, and load each amp with a 2 ohm dummy load if you have one, or 2 ohm test speakers or 4 ohm bridged will do.Apply signal with no more than 10 watts power. Use a 12 gauge or bigger short length of cable. Briefly short across each channel. The amp should go into protection and back out again.Short each channel to power ground. You should have the same result.

You can thermal test the amp also. Run amp at or near clipping. Use a 1khz test tone into 2 ohm stereo or 4 ohm bridged dummy load. If running speakers in either configuration, use hard hitting music at high volumes. A test tone is libel to damage the voice coils. Dummy loads will thermal in a shorter time. You may want to let the amp thermal cycle a couple of times.
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Old 17th January 2019, 05:35 PM   #12
Cekpi7 is offline Cekpi7
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Join Date: Mar 2018
Thanks, i guess it was just bad solder joint, everything seems to be working fine now. Tested it with dummy load at full power, it's playing music for past 2h and doesn't go into protect, i even try turning off and on few times.
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