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Old 19th February 2008, 01:29 AM   #1
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Default Grounding or RCA whining noise problem...

I have a Pioneer Premier DEH-P860MP indash receiver and I am having grounding or RCA whining noise problem...

Four things I've done so far:
1. Replaced three different RCA cables.
2. Changed to a different amplifier.
3. Re-grounded three times to different areas.
4. RCA cables not being near the power cables.

One thing that I figured out was when I unplug the RCA cables from the Sub-Out from the receiver. The whining noise stops. My other amp that controls the highs (door speakers) don't make any noise. I tried turning off Sub in the settings, still the same problem.

Once I get this fixed, I have one more question...Since the receiver has an IP-Bus..will I be able to use a Pioneer IPod adapter (CD-I200) ?

Thanks!
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Old 19th February 2008, 03:21 AM   #2
speye is offline speye  Jamaica
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Default noise

check the sm fuse in the radio if its blown...it grounds the RCA/Pre out jacks..
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Old 19th February 2008, 03:41 AM   #3
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http://bcae1.com/images/rca/temporar...eldrepair.html
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Old 23rd February 2008, 05:52 PM   #4
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the sm fuse is the one in the rear of the HU or inside the HU?
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Old 23rd February 2008, 11:49 PM   #5
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He was likely referring to an SMD fuse.

You can check for continuity with an ohm meter to determine if the shield ground is open.

From the photo in the service manual, I can't tell if it's an SMD or through-hole type fuse. The attached image shows its location (FU351 - just under the IP bus connector).

Click the image to open in full size.
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Old 24th February 2008, 01:26 AM   #6
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thanks a lot Perry Babin !! i followed that link you gave me...i grounded the RCA cable to the HU and the whining stopped! ..it was hard soldering..the solder wouldnt stay on the RCA shiney piece.. i musta got cheap solder? but job is done..thanksss!
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Old 24th February 2008, 01:26 AM   #7
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well i kind of grounded the RCA to the HU using a wire with no fuse in between..is that safe?
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Old 24th February 2008, 01:37 AM   #8
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It's not safe. If you allow the 12v power wire to contact the RCA shield, something will burn. If you used a small wire to ground the shields, it's likely to burn, If you used a large wire, the RCA shield may burn along its entire length.

Fuses are cheap. There's no excuse not to use one.

It's sometimes difficult to solder chrome plated connectors. If you hit it with sandpaper to take off the top layer, it's much easier.
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Old 24th February 2008, 03:27 AM   #9
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hmm..i dont think the 12v wire is contacting the rca shield..but i did use a 16gauge speaker cable i believe..and attached to the 12v wire is a fuse along with some kind of capacitor? ..its coils of copper that stores energy i believe..
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Old 24th February 2008, 03:59 AM   #10
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The purpose of the fuse is to protect the radio and patch cord, in the case of accidental contact with a 12 volt source.
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