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  #1  
Old 09-23-2012, 03:42 PM
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Question 92 S500 radio making weird noises. IE, loud high pitched tone/crackle

My 92 S500's radio started making a loud high pitched tone and/or crackle.
If I turn off radio then turn back on it will work fine for another 10-15min or 10-15 sec. Has anyone had this happen to them? Dont know where to start.
Thanks. Jay

PS. I'm in Canada and we started using the S500 tag in 1992.
Dont want anyone to think I have the year or model posted wrong.

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Old 09-23-2012, 06:40 PM
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My wife's '95 C car had the exact symptoms, and it was the amp in the trunk going bad. Try to isolate it to one speaker, I think that would prove it.
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  #3  
Old 09-23-2012, 06:55 PM
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Its the front drivers side dash speaker. How do I test amp?
Thanks. Jay
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08 Toyota FJ 109K " Wifes winter rig "
04 Jetta TDI 120K " Daughters Car "
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  #4  
Old 09-23-2012, 07:17 PM
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I don't know the specifics of testing it with a meter, but the fact that one speaker is out points to the amp. If your two piece radio is basically the same as the later one piece, the radio doesn't have an output for each speaker. The amp separates it.
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  #5  
Old 09-23-2012, 07:58 PM
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Speaker is not always out, only goes out when the high pitch tone and cracking starts.
Thanks.Jay
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83 300TD Sable 402K " Work Truck "
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04 E320 Blue 90K " My Winter rig "
07 BMW X5 4.4 118K " My Summer rig"
04 Jetta TDI Wagon 168K " Wifes "
08 Toyota FJ 109K " Wifes winter rig "
04 Jetta TDI 120K " Daughters Car "
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  #6  
Old 09-23-2012, 08:50 PM
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It's typical for the amp to go out when hot. That's what ours did and sounds like that's the case with yours.
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  #7  
Old 09-23-2012, 11:14 PM
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Found this site. Going to have my buddy look at it for me. It says the capacitors might be dried up.


Mercedes w140 Bose amplifier rebuild
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Old 09-24-2012, 11:15 AM
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Quote:
Originally Posted by Targa-NF View Post
Found this site. Going to have my buddy look at it for me. It says the capacitors might be dried up.


Mercedes w140 Bose amplifier rebuild
I have a Bose Amp in case you need one.
I can get the part number if interested.
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  #9  
Old 10-12-2012, 09:50 PM
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Location: El Dorado Hills, CA, USA
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There are two generations of the amp:

This should answer your questions.

MBCluster.com Mercedes W140 Instrument Cluster Repair Homepage

It is a pain to unsolder each amp module on the old style, but it can be DIY'ed

Here is a DIY:

W140 BOSE AMP Rebuild - Benzworld.org - Mercedes-Benz Discussion Forum

Best of luck,

Martin
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  #10  
Old 10-14-2012, 08:26 PM
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The plug looks the same on the later stile amp. Has anyone tried to use a amp from a 95-99 part number 140 820 22 89, with a 92-94 that calls for a amp with part number 140 820 00 89.

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04 Jetta TDI 120K " Daughters Car "
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