That indicates that the black laser/scanner is defective. If you have never done it before it could take you about 1 hour to replace. Everything in the back needs to come off to expose the laser/scanners. Most times the issue is the motor inside the laser/scanner and most times it can be fixed by putting a small drop, very small drop of oil on the shaft of the motor. You will need the service manual since it is a bit tricky to remove the laser/scanners.
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