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DEH-P8400MP unit is dead & un responsive. power to unit has been checked along with ground. OEM equipment replaced & operates faultlessly with same power supplies

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SOURCE: Stopped working

I had a similar problem with a jvc 8040. when I replaced the fuse it became very obvious that the b1560 output on the center channel was blown (smoke and sparks, always a dead giveaway). I haven't fixed the center channel yet but simply unplugged the center channel board and removed it from the unit. Now everything works fine except of course the center channel. Pre outs still operate just fine so a slave amp could be used for center channel power, or you could just go and buy a marantz amp; I did and then I realized that I was lucky that the old jvc quit.

Posted on Jan 30, 2008

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1 Answer

How to install a pioneer deh-p8400mp car radio


Hi,
Here is the wring harness colour code for Pioneer.

Yellow= Constant 12V
Red= Switched 12V
Black=Ground
Blue=Power Antenna
Blue/White stripe= Power Amp Rmote turn-on
White & White/Black stripe= Front Right Speakers
Grey & Grey/Black stripe= Front Left Speakers
Purple & Purple/Black stripe= Rear Right Speakers
Green & Green/Black stripe= Rear Left Speakers
Orange= Illumination

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I have a pioneer DEH-8400mp. When you press the OPEN button which drops the front faceplate, the rear display turns off, and none of the buttons do anything. Can you help?


It is the failure of the flexible strip line wire that comes to the panel as this strip breaks of after sometime due to use.
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Hi, i jave just bought a used Pioneer DEH-P8400MP. The guy told me that id did not work no more and that the problem should be the whire to the front plates. Now i habe installed new whires but it still...


The electronics on the main circuit board may be faulty, it can be beyond a home repair I am afraid.

It is possible that the power supply wires were connected in reverse at one time, damaging the circuitry inside.

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I've a Pioneer DEH-P8400MP. I get no sound out of the ISO speaker connector, only out of the RCA outputs. This told me that there was a problem with the IC Amplifier (a PAL007A I believe). A quick check...


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Locating a PAL007A


Just get the
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With a DC voltage tester, check the two power leads for 12+ volts and proper operation, and be sure the unit is properly grounded.

The two power leads are,

1.Constant feed: which should be connected to an un-switched power source that delivers continuous
power to the units memory.

2.Switched feed: which should be connected to a switched power source controlled by the vehicles ignition switch.

Before installing in dash check unit for proper operation.

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Need pic of power, speaker harness


http://cgi.ebay.com/PIONEER-WIRE-HARNESS-DEH-P8400MP-DEH-P8600MP-DEH-P960MP_W0QQitemZ190037675247QQihZ009QQcategoryZ39752QQssPageNameZWDVWQQrdZ1QQcmdZViewItem#ebayphotohosting ------ copy and paste this. i hope this is what your looking for.

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