Open the cabinet, not on the plate current observation, laser focusing up and down movement, but without a laser beam. Normally when the pallet closed, the main CPU IC2511 IC2001 control drive circuit, to rotate the feed motor, drive the move to the CD inner ring laser. When touching the limit switch, the main CPU and signal laser light, laser focus and the spindle rotation. After careful observation, found that the laser head did not move, the feed motor or its drive circuit IC251l defective or mechanical parts. First dial it into the vortex to the alternator pole with the hand, found that cannot turn, look closely, found that the feed motor vortex rod instead of the meshing gear stuck. After correction with forceps, energizing of commissioning, troubleshooting.nEnservice manual download site