Grounding or RCA whining noise problem...

contentryder · 19th February 2008, 01:29 AM

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!

speye · 19th February 2008, 03:21 AM

check the sm fuse in the radio if its blown...it grounds the RCA/Pre out jacks..

Perry Babin · 19th February 2008, 03:41 AM

http://bcae1.com/images/rca/temporar...eldrepair.html

contentryder · 23rd February 2008, 05:52 PM

the sm fuse is the one in the rear of the HU or inside the HU?

Perry Babin · 23rd February 2008, 11:49 PM

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).

contentryder · 24th February 2008, 01:26 AM

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!

contentryder · 24th February 2008, 01:26 AM

well i kind of grounded the RCA to the HU using a wire with no fuse in between..is that safe?

Perry Babin · 24th February 2008, 01:37 AM

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.

contentryder · 24th February 2008, 03:27 AM

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..

I Am An Idiot · 24th February 2008, 03:59 AM

The purpose of the fuse is to protect the radio and patch cord, in the case of accidental contact with a 12 volt source.

19th February 2008, 01:29 AM	#1
contentryder diyAudio Member Join Date: Feb 2008	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!

19th February 2008, 03:21 AM	#2
speye diyAudio Member Join Date: May 2005 Location: house	noise check the sm fuse in the radio if its blown...it grounds the RCA/Pre out jacks..

19th February 2008, 03:41 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	http://bcae1.com/images/rca/temporar...eldrepair.html __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

23rd February 2008, 11:49 PM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

24th February 2008, 01:37 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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23rd February 2008, 05:52 PM	#4
contentryder diyAudio Member Join Date: Feb 2008	the sm fuse is the one in the rear of the HU or inside the HU?

24th February 2008, 01:26 AM	#6
contentryder diyAudio Member Join Date: Feb 2008	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!

24th February 2008, 03:27 AM	#9
contentryder diyAudio Member Join Date: Feb 2008	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..

24th February 2008, 03:59 AM	#10
I Am An Idiot diyAudio Member Join Date: Mar 2007	The purpose of the fuse is to protect the radio and patch cord, in the case of accidental contact with a 12 volt source. __________________ If it ain't broke Don't fix it

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