Denon DCM-280 not reading all CD-R, originals and some CD-R reads fine without skipping. What to do?

SOURCE: New laserunit won't work

You seem confident enought to take it apart, have you tried cleaning the runners that the laser runs backward and forward on.
Some times they collect dirt/dust and the laser can't move smoothly so it jerks and skips.

SOURCE: Denon DCM 5000 error code

The disc is loaded upside-down in the disc rack or the disc is dirty or scratched, try another disc and make sure the top side (label side with printing) is facing towards the back of the rack, away from you. The bottom or data side should face out towards the front of the rack. If that does not work then your laser picups inside may need cleaning. Make sure your disc is clean and now scratches.

SOURCE: Denon DCM 390 not longer reads discs--HELP!

Hi there, this lens may be dirty or it may have a thin layer of heat film that is causing it to not read in a consistent manner. i would try to clean the lens with a good CD lens cleaner. if the cleansing doesn't restore the lens to its original reading state, this will confirm lens assembly failure and you will need to replace this assembly.

SOURCE: Denon DCM-280. Tray won't open, there are CDs in

If you don't wanna send it for service, open the chassis of the player and free the CDs from the tray. Its highly likely that the CDs came off the trays and got stuck inside.

SOURCE: cd changer is jammed in denon dcm 360 5 cd changer

Simply remove the outer casing and remove the jammed disc