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Hello,
I have an Extreme Sound WM5353 stereo in my old truck that I bought from Wal Mart. It plays normal cd's, cdr's and mp3's. The warranty is out on it unfortunately. It has stopped taking cd's. It will eject them fine if I push the cd in and push the eject button, but will not "pull" the cd in on it's own or play cd's anymore. Any idea's on what might be the problem? Thanks for any help you might be able to give me.
Model: 7 36614 00586 4
Answer -
Jared,
The best way to find out why a CD won't go in all the way is to pull the CD player out of the dash and take off the cover. with the cover off try to load a CD and SEE what happens. In many of the CD palyers that I repair the main reason that the CD will not go in all the way is because the rubber rollers are out of adjustment or dirty/slippery. With the top cover off you may want to gently clean the laser lens with a Qtip dampened with rubbing alcohol.
TOM,
T&D ELECTRONICS
tdeser@zoominternet.
Hello Tom,
Thanks for your reply. The cd will go all the way in if you push it in. The problem is that the stereo does not "pull" the cd in automatically like it used to and once the cd is in the player (even if it is pushed in) it will not actually play the cd but it will eject the cd just fine. I have taken the cover off of the cd player and can see nothing obvious wrong. What is it that "triggers" the cd to be "pulled" into the player and be played? The rollers appear to be clean but I do not see an adjustment on them. The eject button works fine and I don't see any problems with the gears or "rubber band" that eject the cd. Since they are the only gears and "rubber bands" that I can find, I assume the same ones are used to "pull" the cd into the player. Is there some sort of sensor or trigger that could have gone bad? Or is there some sort of special way to adjust these rollers? The rollers spin fine when ejecting though. Thanks again for the help. I'll try cleaning the lens next chance I get to see if that helps any.
Answer -
Jared,
After giving your problem some more thought, the rubber rollers may be gripping the CD ok or it wouldn't eject the CD. The load problem is most likely due to a faulty sensor. With the top cover off of the CD assembly you will notice a small circuit board at the top front of the CD chassis. When you insert a CD in the front slot, the CD will break a beam of infrared light from the LED to the photo transistor. When this happens the control processor will send a motor load signal to the load motor and the CD will be pulled into the play position. On many of these car CD players that I repair with a load problem the most common problem is a defective solder connection in the sensor wiring. On a few I will find defective sensors. Note, if you manually push the CD in as far as you can and then press eject and the CD comes all the way out and then the load motor stops, it confirms that the motor drive circuits, the full out sensor and the load motor is OK. The problem is with the in sensor circuits.
TOM,
T&D ELECTRONICS
tdeser@zoominternet.net
Hello again Tom,
Thanks for all the help. I've found the photo sensors buried in the top plate of the cd player. I uncovered some tape and found the words "eject" next to one sensor and the words "xin xing" next to the other. With no power to the unit, using my multimeter set on continuity check, with the leads of the meter across the legs of the "eject" sensor I get a small reading - 1.5 I think. On the other (I'm assuming it to be the "in" sensor) I get 0.L which I'm assuming means an open or broken circuit. With power to the unit, and the leads of my meter across the legs of the sensors, and the meter set to 2 volts, when I push the cd in manually past the sensors, I get a small reading on the "eject" sensor and no reading on the other one. Does this tell you anything? Do you think it is still more likely to be a solder connection somewhere than the sensor itself as you stated above? If it is the sensor, can these be purchased at Radio Shack? Just trying to narrow down my troubleshooting. Is there a good way to test the sensors while they are still soldered into the stereo? Thanks again for all the great help.
AnswerJared,
You should see two sensors on the sensor plate/board. There will be one sensor for loading the CD in and one to tell the system that the CD has been ejected all the way out. With the volt meter you should test/measure the voltage on the load sensor without a CD in place, the voltage on the output will be around 5volts. When you insert a CD past the load sensor the voltage should drop to less than .5 volts. basically the sensors are a photo transistor that when the LED is shines on them the transistor will conduct/turn on and the voltage across it will drop to near 0 volts and with no light on them the output will be near 5 volts.
TOM,
T&D ELECTRONICS
tdeser@zoominternet.net
