Question about Pioneer DEH-P840MP CD Player

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Repair no.3 This repair--rear display doesnt light up...it does move...so the cd player works..however the ability to tweek the system is no more due to this problem....i was able to get by for several months...but i put a new battery in, and id like to tweek the system back to par. --i realize there were more posts similar to mine but i am on a dialup connection....enough said I appreciate your help Craig

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REPLACE THE RIBBON CABLE IN THE FACE PLATE

Posted on May 13, 2008

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Posted on Jan 02, 2017

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My cd is not being read on my panasonic cd stereo sa-ch64m


A typical symptom is you insert a disc in the player and after a while; the CD tray opens again with the message referring to no disc being in the system. This can be infuriating because you can see that there is a disc, however, the CD / DVD player cannot.
Every time the tray closes, the laser beam fires two long bursts of laser light, and the focusing platform moves up and down attempting to focus the beam. This is the time when it is looking for a disc. If the laser has failed, then it will not be able to detect a CD and therefore the error message appears.
I normally do two things when this happens. I normally clean the lens just in case there is dust on it obstructing the laser path. If cleaning the lens does not solve the problem then I make sure the laser is working. Second Problem can we with your CD. After some time the CD coating gets deteriorate due to atmosphere, this damages the coating of CD/DVD where data is stored..
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Here are few ways at this link:
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TOO MUCH BASE


Try for starters, a different mic, maybe something happened there, maybe some party mix got into it.
Other than that might need to figure out what you did tweek on? by getting a schematic on it and looking at the pictorial and checking the marking on the pc board what it says such as VR3 or whatever it is you might have tweeked on and see what it really does according to the schematic. Hard to tweek on something if you dont know what it does. I have never seen any tweeking make such an improvement that it increased power or talk ability to the extent it incresed your range dramatically. It's not worth the tweeking! The only way to tweek on CB's are with test equipment such as an oscilloscope and other gear. Sorry this has happened to you, it has happened to me before. Then I got wise and did it proper with the gear. Still no improvement as power gain to make any difference. Better off using a good antenna system to get more power going out into the world.

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I have the same problem and it's due to dirt!
I'm going to try using compressed air, but -
this definitely works:

:) Seriously:

tilt the cd player to a 45 degree angle (flat, basically - as if they tray were horizontal.)

I had my player for 10 or 12 years, and this problem is only coming up now. My house gets very dusty.

Also - vertical load disc players are hard to clean. X_X (inside the disc tray)

I love this stereo too!
I don't want to have to go out and buy another stereo!

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