Sc-901 Whining Noise In Prologic Only

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Sc-901 Whining Noise In Prologic Only

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ddub View Member Profile	Aug 28 2008, 06:03 PM Post #1
Newbie Group: Members Posts: 8 Joined: 28-August 08 Member No.: 47,477 Status: Location: usa Drives: c70	My 2004 C70 SC-901 whines when in Pro Logic mode only. Not alternator noise, happens when engine is on or off. Any ideas?

ddub View Member Profile	Sep 9 2008, 12:52 PM Post #2
Newbie Group: Members Posts: 8 Joined: 28-August 08 Member No.: 47,477 Status: Location: usa Drives: c70	OK, the tech rep at URS (the alpine service center) got my head unit today and he cant replicate my problem. He says he called Alpine and they say that the issue is likely in the amp or in an equalizer somewhere. Since the units equalizer is built in, Im guessing it must be a problem with the amp. I found one on ebay that I purchaced but I wonder if anyone has any experience replacing or having an amp worked on? The URS tech says the amp is not Alpine and they dont know if it is servicable or not.

MKC70 View Member Profile	Sep 10 2008, 10:13 AM Post #3
Senior Group: Members Posts: 290 Joined: 29-January 07 Member No.: 23,913 Status: Location: USA Drives: 1999 Volvo C70 coupe	The amplifier other than a DIN connection instead of RCA's is physically identical with the Alpine MRV-12 series, and perhaps gold plated terminals. Your URS tech says that the problem is in the amp? I would question the diagnosis since it obviously works well in the other modes. Yes, the one equalizer is built into the HU, but the Dolby processor is a separate audio component located near the HU.

ddub View Member Profile	Sep 11 2008, 11:36 AM Post #4
Newbie Group: Members Posts: 8 Joined: 28-August 08 Member No.: 47,477 Status: Location: usa Drives: c70	Maybe I should clarify. The URS tech says that he called Alpine and the Alpine tech is the one that says the noise is likely not coming from the head unit but from either the amplifier or "from a seperate equalizer or something" Since the noise is only in the prologic mode, it may be the dolby unit. Where is the dolby processing unit? Id like to check the grounding of that unit. Followup: nevermind... found it. http://volvospeed.com/vs_forum/index.php?showtopic=92471

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