Question about Pioneer DEH-P7400 CD Player

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How do i reset the unit? after my battery died got a new one now the only sound is through the rca output

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  • ratpuncher Nov 10, 2010

    you would think so but if there is one nobody i know can see it

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There is a small reset button that you can push with the tip of a pen on the front or detach or drop the face and you should see it.

-david

Posted on Nov 09, 2010

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Posted on Jan 02, 2017

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If you want to upgrade your sound system in your car by adding a sub woofer or speakers powered by an auxiliary amplifier without having to get a new head unit then hopefully this should help you :)

I decided to keep my standard head unit because it looks well in the car, is less likely to attract thieves than a shiny after-market unit and it is a factory upgraded unit anyway and i find it gives pretty good audio quality, it works with the steering wheel controls and has bluetooth and aux-in, so an after-market unit wouldn't offer a substantial upgrade.

Factory head units rarely have RCA or "Low line" outputs which your amplifier will need for it's input signal.
A "Low line converter" is a device which will piggy back your speaker outputs from your head unit and convert them to Low Line RCA outputs for your amplifier

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I have an RCA RTD3136 theater system, bought new in 2013. Worked fine for a few months, then started going out occasionally. I'd unplug the unit and reset, and it would work fine,for a while.


It sounds to me like the audio output transistor or IC is going bad,or the unit is overheating.Try blowing the unit out with canned air and relocating it so it can(breathe)<dissipate heat .

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1 Answer

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Light is on so suggests power, earth and remote turn on cable all ok. Now you just need to test the RCA signal and the AMP output. I take it you have used low level RCA as the input from the head unit? (two cables usually red n white although can somtimes be other colours) best way is with substitute amp n speakers etc although can be done with osciliscope or headphones. Once it is established the RCA signal is fine then you can check the speakers from the amp. disconnect them at the amp and put each of the two wires briefly to a battery, any battery will do e.g. 9v PP9 or 1.5v AA etc you should hear a pop from each speaker as you do it. that proves the speakers and wiring to them.
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Or the RCA output from the unit may be knackered.

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