Question about Pioneer DEH-P4100

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Malfunction I have had this model for the past couple of years, and I am now having some serious problems. It now plays only CD at 30 notches of blasting volume! And I can't change it all. It is completely locked up. I appreciate all the help you can give me. thanks. It is a pioneer DEH-P4100

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Re: Malfunction

Check none of the buttons are stuck in. Try pressing the reset button. I think it is bottom right and recessed in a hole. The unit should be on and you'll need something pointy like a pen or toothpick. If you cant find the reset button, disconnect the car battery for a minute or two. If that doen't work, then it will probably need repair.

Posted on Sep 21, 2007

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My car jvc player dsplay please eject message.somtimes it playes cd after a large numbre of 'switch on and off' task.reset severl times doesnt work,also a cd cleaning service only helps rare or upto some...

i have been servicing car audio for 20 years if the lens is god driven then its probably your lens have you ever had i hand cleaned? by a service pro start there if it still plays up then the take up rollers or latch tray are damaged and the unit will have to be replaced ..... there is only 1 way to tell if a lens is any good you have to use a special lazer disc was this used when tested



Adjusting your gain for your amplifier, or amplifiers

I contacted JBL, and Pioneer about the RCA outputs of the DEH-P5800MP. I got a question answered by JBL that you should gain your amplifier, or amplifiers at half of the Head Units volume, in which case the 5800 model has a max volume of 62. I would assume that this goes for any unit since I didn't give JBL the model or brand, which indicates that they are giving a tip on every, or most units unless specified. You can e-mail the manufacture on what unit you have just in case yours is different. I found after a good conversation with the technical support guy at Pioneer that you should turn your volume up to 25-30 (25 for your loudest CD, and gain it from there. I told him that I was an audiophile and he suggested that I could gain it at 45 for my lowest recorded CD. I have been installing and gaining systems at 3/4 volume, or if the max volume was 62 then I would gain my lowest recorded digital CD at that volume. I was amazed that JBL had an answer for probably 90% of the head units, and I have learned something new. I was under the assumption that the higher the volume the more voltage the RCA's put out allowing you to be able to have your amp gain at a lower level. From my experience of 12 years, hearing both companies say roughly the same thing it is apparent that Pioneer units with a 2 volt output should be gained at the 25-30 volume range(probably for your lowest recorded CD. I have CD's that are pure digital and bass CD's and CD's that are recorded louder (like techno music, or alternative music) If you know what you are doing, and can hear distortion, like I can, the tech said that I could gain it at 45 for the lowest recorded CD. This allows your lowest recorded CD to be played at max volume at 30-45, and your loudest CD's would be at peak volume before 30, or 45 if you choose that route. Keep in mind that less power blows speakers before more power does. That is the best advice I can give, and I will adjust my system accordingly to there recommendations. Thank you

on Sep 08, 2007 | Pioneer DEH-P5800MP CD Player

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JVC car stereo won't play cd

If it does it with any cd and it played before you have to clean the lense or laser. Get a cd player laser cleaner disk or cd. If you still have problems take the radio fuse off in the fuse block to restart it. Remove the fuse wait five minutes then reinstall. Also some times when you burn CDs in the wrong format the cd player will not recognize them.


1 Answer

Cd's won't play!!

You can try just one more thing to see if it helps. Use a cleaning disc to clean the lens. You run it for about 20 or 30 seconds and it brushes off any dust or the like from the lens. If that does not work you have a problem with the laser or the servo circuit that can only be repaired by a professional technician.

If it is under warranty contact Dual to find an authorized repair center or the address to send it to for repair. If it is not under warranty they can still tell you where you can get it repaired.

I have been working at authorized service centers for many manufacters for over 17 years, but have never seen anyplace authorized for "Dual" car audio. So you may find it very difficult to get it repaired.

If the laser is bad, the repair may cost around $125 to $150 depending on the cost of the new laser and the labor rates of the service center. The laser is the most common problem with all CD players, car or home.

If you have found this information to be helpful a good rating like "FixYa" or "Helpful" would be appreciated. The other two ratings are actually bad ratings.

Thanks, and let me know if you need any more help.


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Does it play the tuner but not the CD?

If it so, the problem is directly related to the CD deck. If not, the problem could be a sensor or any number of other components that may have overheated.

Try to reset the unit. Most of the time this error is an electrical problem not fixable by the end user. But it is worth trying to reset the microprocessor and see if that helps.

Here is a diagram of where the reset button is at. Press it in with the tip of an ink pen or paperclick, whatever you have that will fit into the little hole. Just hold it in a couple of seconds. Be advised that when yo reset the unit, you will loose all things in memory like the correct time, preset radio stations ect.

If this does not help you will need to have it checked out by a good repair center. These Alpine radios are very good radios and are worth getting fixed unless the estimate is close to what you paid for it.

good luck, I hope this helps. if so, a good rating would really be appreciated. You can always ask me for more help if you need it. I have been repairing car and home audio equipment for over 17 years.


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Have you tried removing the negative terminal from your car battery and giving it a few minutes. Hook the terminal back up and try your cd player again? That should be the same as resetting your cd player settings.

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