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Old 30th July 2010, 06:14 AM   #1
dtisme is offline dtisme  United States
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Default hifonics 1606d

i have a hifonics 1606d amp that makes a high pitch ringing noise through the subs. I replaced the hip4080a and tried adjusting the vr10 with no luck. Anyone know what im missing? Is there something else i should check? Thks
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Old 30th July 2010, 09:26 PM   #2
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How loud is the noise?

Is the frequency of the noise related to the engine speed?
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Old 30th July 2010, 09:48 PM   #3
dtisme is offline dtisme  United States
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It’s a loud noise. Similar to the “This is a test of the emergency broadcasting system” sound that plays (or use to play) through the television years back. The noise is not dependent on the engine running. The engine itself can be off and the noise and its levels are the same. I also turned the stereo volume level down to zero on the stereo however the amp still plays ringing whine noise through the subs.
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Old 30th July 2010, 09:50 PM   #4
dtisme is offline dtisme  United States
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It’s a loud noise. Similar to the “This is a test of the emergency broadcasting system” sound that plays (or use to play) through the television years back. The noise is not dependent on the engine running. The engine itself can be off and the noise and its levels are the same. Volume level of the stereo is set to zero however the ringing whine still plays through the speakers. I have noticed that it only starts after listening to music for about 10 minutes at moderate volume levels. Once the amp cools down, it plays normal for about another 5 to 10 minutes then its statrs back again.
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Old 30th July 2010, 10:51 PM   #5
dtisme is offline dtisme  United States
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Ive attaced pics of what ??could?? posibily be the issue. Im not sure however.
Attached Images
File Type: jpg IMAG0237.jpg (69.2 KB, 60 views)
File Type: jpg IMAG0239.jpg (104.9 KB, 60 views)
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Old 31st July 2010, 12:53 AM   #6
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That appears to be fixative that has been overheated. The resistor normally runs hot and can cause the fixative to change color. If you're concerned about it, you can pull the fixative off of the resistor and apply a different type of fixative.

If that's not it, it could be due to an intermittent connection (short or open). When it begin to make the noise, push on various components and various points on the board to see if you can change the tone. Use a non-conductive probe (wood, fiberglass...).
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Old 2nd August 2010, 07:45 PM   #7
dtisme is offline dtisme  United States
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Nothing change as for the sound. Is it possible the yellow (or orange color caps) next to the terminal are bad or going bad?
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Old 2nd August 2010, 07:48 PM   #8
dtisme is offline dtisme  United States
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I've also noticed yesterday that the stereo does not need to be on for an certain amount of time before it starts to make noise. Seems to simply coincide with the outside temperture here in Houston. Temp in my truck read 97. Soon as I turned stereo on, amp was maknig the noise.
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Old 2nd August 2010, 10:09 PM   #9
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If it's related to temperature, use a heat gun to selectively heat various components to see which one causes the fault.

Did you try moving various components to see if that made a difference?
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Old 2nd August 2010, 10:17 PM   #10
dtisme is offline dtisme  United States
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I pushed on various components with no success. I'll try the heat gun method. Sounds like that would work.
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