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Old 2nd January 2006, 03:59 PM   #1
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Default crackling sound CDM4

I have a problem with my CD player. It is a CDM4/31 type mounted in B&O Beocenter 8000.

It plays perfectly for apporx. 30 minutes. After that the sound distorts and crackling sound occurs in the high frequencies.

Does anyboy have an idea wht the problem can be? and how to fix it.

Thanks,

Thomas
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Old 3rd January 2006, 09:51 PM   #2
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Sounds like a DAC problem to me. What DAC(s) is/are used in B&O Beocenter 8000 ? Is the crackling noise only in one channel ?
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Old 3rd January 2006, 09:58 PM   #3
anatech is offline anatech  Canada
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Hi Thomas,
If you cool the circuit off, does it play longer before it starts? Removing the cover (difficult on B&O) may do this.

I have seen everything from the brown glue cause this to digital filters, DSP chips and DACs. Mistracking may also cause distorted sound, as will a low HF signal.

Can you record the sound in a sound file (ie MP3) and attach? This may give us more clues.

-Chris
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Old 4th January 2006, 07:32 AM   #4
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Jean-paul,

A TDA 1541 DAC is used.

The crackling sound is on both channels.

Thomas
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Old 4th January 2006, 09:01 AM   #5
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Use the freeze spray! Spray just a short burst on to 1541 and I bet the crackling noise will disappear.

Good luck,
Extreme_Boky
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Old 4th January 2006, 10:59 AM   #6
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Exactly.

If the TDA1541A is the problem and you really like the cdplayer you could replace the chip for a silver crown version.

I would advise you to replace all electrolytic caps too after you have solved this crackling noise problem.
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