Question about Sony CDX-MP40 CD Player

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Can't get CDX-MP40 to work...

I've had it for awhile and haven't had any problems. But I accidentally left a cd in it for a week (I was out of town) and now I can't get it to power on to get my cd back out. Nothing comes on, no Also, I can't find the manual and am not sure I still have it. Help!? Thanks, Dolly

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Re: can't get CDX-MP40 to work...

You can get a manual here Your unit sounds like its dead. Try unplugging it for a day or overnight. if that dosent work your going to need to take the unit into the repair center. Good Luck

Posted on Aug 13, 2006

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good day, you may have an audio problem, try to check the wiring harness of your stereo for some maybe are loosen. hope this helps

Feb 04, 2010 | Sony CDX-MP40 CD Player

1 Answer

Can the illumination colour be changed on the cdx mp40

You will need an expert technician to open the unit, they are small bulbs with covered color lenses, usually small plastic caps. the simplies is to remove this caps and mark it with colored felt tips marker

Aug 09, 2009 | Sony CDX-MP40 CD Player

1 Answer


Hi there,

i doubt you will be able to find one, if you do its going to be more expensive then the unit itself.

you have a look on ebay?? or your best of buying a new one!

hope this helps


Apr 06, 2009 | Sony CDX-MP40 CD Player

1 Answer

My tracks don't play in the recorded order, list I made them.....

If song tracks jump or skip then it is problem of cd player like optical laser is dirty / clogged,
and if track doesn't jump or restarts in middle of playing back then cd player is just fine,
Please check cd creator software settings.

Dec 18, 2008 | Sony CDX-MP40 CD Player

1 Answer

CDX mp40 will skip when playing a cd everytime it gets bumped


May 22, 2008 | Sony CDX-MP40 CD Player

2 Answers

Sony CDX-MP40 only works after hitting reset button

If you dosn't find a solution, then I'am very interested in buying the faceplate for this unit.

Mar 09, 2008 | Sony CDX-MP40 CD Player

1 Answer


You are correct, the unit powers entirely from the red and yellow leads. Your symptoms sound like a unit that isn't getting power on the red (switched) lead. The most likely cause is a blown fuse in your vehicle's fuse box.

Mar 13, 2007 | Sony CDX-MP40 CD Player

1 Answer

Sony CDX-MP40 won't power up the amp.

Most in-dash stereos have a blue wire in the harness which is used as a "wake up" signal for external amps. Did you connect this? Does it have any voltage on it when the stereo is on?

Mar 03, 2007 | Sony CDX-MP40 CD Player

1 Answer

MP3 files start skipping/popping after few minutes of playback

Sony say in the manual that if you record high bit-rate mp3's the sound may be intermittent. I feel this is due to the decoder having to move ALOT of bits around to play, try some makeing a disk with mixed rate mp3's on. e.g.) some 64Kbps, some 128, some 192, and some as high as you can get and see if there is any differ Luck

Mar 02, 2007 | Sony CDX-MP40 CD Player

1 Answer


Did you hook up the red ignition wire?

Sep 14, 2006 | Sony CDX-MP40 CD Player

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