Pioneer CDJ eject problems

Pioneer CDJ eject problems

The eject mechanism of all the Pioneer CDJs is almost identical. In this tutorial we disassemble the eject mechanism of a CDJ1000MK3 but the procedure is very similar for all the other Pioneer CDJ. After that we address the most common problems you may encounter. Remember that most eject problems are mechanical problems and rarely electronic.

(With “eject problems” we mean when the cdj has difficulty loading or ejecting cds, and not the problem where the cdj ejects the cds by itself. This problem is usually due to a bad laserhead and we will cover it in another tutorial.)

Below is an opened CDJ1000MK3:

Remove the 4 screws shown in the red circles:
Lift the metal cover of the eject mechanism. Make sure not to lose the earth spring shown in the red circle:
Unhook the eject mechanism from the four black hooks shown in red circles. One way to do this is to push with one hand simultaneously the two hooks and with the other hand lift up the mechanism from the edge shown in the photo. Then do the same for the other side:
Disconnect the connector pulling it out gently:

 

When the eject mechanism is unhooked, lift it up from the front:

 

Turn the eject mechanism upside down and place it gently on the cdj. You have to unhook the eject motor from its place.
To do this first turn slightly the motor to the left:

 

Then lift up carefully the motor from the thread side:
Apply carefully little force and unhook the motor from its holding:

 

The eject mechanism is now free from the rest of the cdj:

Now that we have disassebled the eject mechanism we can check for problematic parts. The most common problems are the following:

 

dnk3407_1.jpgPart No: DNK3407 This is the most common failure. This part bends or wears out but it is not obvious. Replacing it fixes many eject problems and it is recommended if no other obvious sign of damage is present. To replace it pull it down and then it can be removed. It needs caution when mounting the new part because all the surrounding parts must be fit in place.
dnk3404.pngPart No: DNK3404 or DNK3576 This part holds the cd disk on the spinning motor. Usually the point in the red circle breaks and the cd player jams. Remove a spring that holds it and it can be easily replaced.
dnk3478_1.pngPart No: DNK3478 This part usually breaks in the point in the red circle. The white part (dnk3407) should be first removed to replace this one.
dnk4369_2.jpgPart No: DEA1022 or DNK4369 The loading base may be broken in the plastic parts. In such case the whole loading base should be replaced.
dea1008_1.jpgPart No: DXX2510 or DEA1008 Often this motor accumulates debris and dirt, and the loading may not be smooth. If the debris is excessive the motor should be replaced but usually another part may have been damaged first: usually a fuse or even the main pcb. To check it you need an ampere-meter. Supply the motor with 5volts and check the current. If it is more than 200mA the motor is defective and it should be replaced.