Pioneer DEH-P860MP RCA grounding problem - Page 2

Perry Babin · 1st November 2006, 04:52 PM

http://www.littelfuse.com/data/en/Data_Sheets/466.pdf

This datasheet should apply to that fuse. P = 3A.

It should read very near 0 ohms. If it measures higher than 1 ohm, it's defective.

horent135 · 11th June 2007, 08:23 PM

Im not sure if my situation is the same as his but i have been using deh-p6500 for many years and it never happen to me before. The other day I install the aux port (ip-bus) to my ipod using RCA. After a few mins, i get an annoying, loud static noise. I switch over to radio and cd player, and i still get that noise. If i turn off the headunit for a few minutes, and turn on again, it doesn't make that noise until 5-10mins later. When i took out my headunit, the back was very hot.. and i try to check it out what making the noise and didn't find anything missing or loose wires.

Could be i have the same problem and i should do the same exact thing??

audiobahnkid592 · 17th June 2007, 04:30 AM

Hey Perry, Would this cure a slight alternator whine or no?

Perry Babin · 18th June 2007, 03:20 PM

With most systems, an open shield on the head unit (or on any signal processor in the signal line) will cause significant noise. If the noise is minor, you may be able to reduce it to acceptable levels by reducing the gain on the amp.

youatyahoo · 13th March 2008, 03:14 PM

Hey, great work, just happened to mine, need to repair then will do what you have posted here, do i have to do that with all rca cables?

Perry Babin · 13th March 2008, 04:19 PM

You can generally ground only one to restore the shield ground for all of the RCA outputs. If one or more of the ungrounded channels produces noise, ground them also.

geaugafletcher · 13th March 2008, 08:11 PM

The sensitive ground issue is well-known on certain Pioneer head units. See this thread:

http://www.diymobileaudio.com/forum/...0prs+grounding

at the diymobileaudio forums for info. It's a very long discussion, but the answers are all there. In a nutshell, there is a TINY fuse or sacrificial resistor that burns out if the grounding is not handled carefully.

To prevent problems, DO NOT connect/disconnect any RCAs to anything if the unit is on. In fact, disconnect the 'phantom' power as well. When it comes to installation and such, the first thing to attach is the ground, and the last thing to disconnect is the ground.

It was also recommended to ground the chassis to the same point as the harness ground.

1st November 2006, 04:52 PM	#11
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	http://www.littelfuse.com/data/en/Data_Sheets/466.pdf This datasheet should apply to that fuse. P = 3A. It should read very near 0 ohms. If it measures higher than 1 ohm, it's defective. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th June 2007, 03:20 PM	#14
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With most systems, an open shield on the head unit (or on any signal processor in the signal line) will cause significant noise. If the noise is minor, you may be able to reduce it to acceptable levels by reducing the gain on the amp. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

13th March 2008, 04:19 PM	#16
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You can generally ground only one to restore the shield ground for all of the RCA outputs. If one or more of the ungrounded channels produces noise, ground them also. __________________ 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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11th June 2007, 08:23 PM	#12
horent135 diyAudio Member Join Date: Jun 2007	Im not sure if my situation is the same as his but i have been using deh-p6500 for many years and it never happen to me before. The other day I install the aux port (ip-bus) to my ipod using RCA. After a few mins, i get an annoying, loud static noise. I switch over to radio and cd player, and i still get that noise. If i turn off the headunit for a few minutes, and turn on again, it doesn't make that noise until 5-10mins later. When i took out my headunit, the back was very hot.. and i try to check it out what making the noise and didn't find anything missing or loose wires. Could be i have the same problem and i should do the same exact thing??

17th June 2007, 04:30 AM	#13
audiobahnkid592 diyAudio Member Join Date: Mar 2007	Hey Perry, Would this cure a slight alternator whine or no?

13th March 2008, 03:14 PM	#15
youatyahoo diyAudio Member Join Date: Mar 2008	Hey, great work, just happened to mine, need to repair then will do what you have posted here, do i have to do that with all rca cables?

13th March 2008, 08:11 PM	#17
geaugafletcher diyAudio Member Join Date: Feb 2006 Location: Oklahoma	The sensitive ground issue is well-known on certain Pioneer head units. See this thread: http://www.diymobileaudio.com/forum/...0prs+grounding at the diymobileaudio forums for info. It's a very long discussion, but the answers are all there. In a nutshell, there is a TINY fuse or sacrificial resistor that burns out if the grounding is not handled carefully. To prevent problems, DO NOT connect/disconnect any RCAs to anything if the unit is on. In fact, disconnect the 'phantom' power as well. When it comes to installation and such, the first thing to attach is the ground, and the last thing to disconnect is the ground. It was also recommended to ground the chassis to the same point as the harness ground.

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