Into the disk boot, it is found that the disc does not rotate, the laser head nor focusing servo action, careful observation found the position of the laser head in the marginal zone of the disc, and in signal into the area of the disc center. The machine fault is due to play VCD when the power switch is switched off. The reason for this is that the fault may be caused by accidental power supply, which is caused by mechanical damage. Exit CD tray, hand to the center of the laser head gently to set the laser head components, servo motor began to rotate, the components of the return to the in situ test machine, playing normal, failure seems to rule out.

But in the play process, the machine can only play the first half of the CD, the second part is still unable to play. Then re open the cabinet. Into the disc, disc half choose to play, found laser head component from the center of the disc moves outward process in a position to arrest, disc stops rotating, then head back to toward the center to move a little, disc to rotate, but the rate decreased significantly. The laser head has been read dish state. Careful observation, found servo plastic rack in the middle of a tooth gap blockage, gear rack near the disk center position is less a tooth, just head assembly operation to the disc edge, running gear to the gear rack this end. This inference, it is the power of the impact of the broken teeth, and in the back of the head when the gears with a broken tooth movement and was on the rack on the lubricating grease to cause the new fault. Take off the broken teeth, the test machine, the second part of the play. Broadcast a zoned recorded programs are full of CD and play the last song, also can play is completed and the head to return to in situ, broken teeth position just is located at the edge of the CD, this is a description of bald is due to unexpected shocks moving in the opposite direction to break the one end of the gear rack and causing death card. Summary: in the play in the process of CD, if you want to shut down should be according to the first stop, l, 2 seconds, to be laser head back to a close power switch as well!

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