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CD shows no disc

hello: part of the CD shows no disc. The motor and laser do not move. The tray is working. The spindle motor spins nicely from 3V, the sled also runs normally from 3V, tray also. Switches are good. I can't measure anything plugged in, the wires are very short. + 5V and + 7V go to the unit. The drawing on the farm is missing the drawing of the CD unit. The exploded view shows CDM 28-58D10D, the panel HCMK-P3X, the ICs BA6297AFP and CXD 2515AQ. In addition, with KSS240 optics. Would anyone have an idea or a missing drawing? Valentine
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Mr._V.
Mr._V. picture

Laser power too low. (2-5 year need set up again).
On laser head.
800ohm --> 650 ohm
500ohm --> 350-400 ohm
300ohm --> 100 ohm
200ohm --> 50-100ohm

Not correct numbers only demonstration!
Test... and CD loaded, "reading" not read (scratch sound) +ohm set, (silent) -ohm set.

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