After the optical drive is out of the warehouse, bounce back.

When the button is pressed, the CD-ROM is long, but it bounces back immediately.

This failure is due to the optical drive out of the warehouse to judge the surface of the switch caused by oxidation, resulting in poor switch contact, so that the machine mistakenly think out of the warehouse, in the delay period will also enter the warehouse. This situation is common in the "Philips" movement.

The solution to this situation is the use of water sandpaper on the switch spring grinding, must pay attention to the strength, not too vigorously.