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Old 18th March 2012, 07:00 PM   #1
timwebb is offline timwebb  United States
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Default hifonics 1200

im working on this amp and i got it to play but the output driver card get really hot then the relay clicks.but the amp doesnt turn off or go into protect.any idea what that could be?
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Old 18th March 2012, 07:10 PM   #2
timwebb is offline timwebb  United States
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i think i found the issue. i get a bad signal on half of the output transistors.
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Old 18th March 2012, 10:51 PM   #3
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You need to give the exact model number. Even then, more information may be needed because at least one model number hifonics amp had 2 different boards.
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Old 19th March 2012, 12:00 AM   #4
timwebb is offline timwebb  United States
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its the bxi1208
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Old 19th March 2012, 06:26 AM   #5
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The driver boards run hot, especially the two 1D transistors in the center of the board (you should replace them, even if they're not defective).

Measure the voltage across the relay coil. Does the voltage drop when the relay drops out?
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Old 19th March 2012, 10:45 PM   #6
timwebb is offline timwebb  United States
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the driver card get hot at idle with no load on it. there was a cold joint at the relay that was arcing. im going to measure it now..
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Old 20th March 2012, 03:32 AM   #7
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The components in a class D amp (except for the output transistors) operate at approximately the same temperature whether it's idling or driving its lowest rated load at full power.
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