Canon SELPHY DS810 Service Manual page 20

(2) Notes on disassembly and re-assembly
For DS810, only removal methods of external parts which are different from DS700 are described.
Since external parts of DS810 contains the mirror / coated parts, make sure not to scratch or smear them.
For notes on disassembly and re-assembly of parts other than the parts shown below, refer to DS700 Service Manual.
Access Sub Panel removal
From the rear side of the printer, remove the access sub panel by lifting it frontward using fingers.
(There are seven claws. Make sure not to break (not even whiten) them.)
Output Tray Unit removal
1) Release the left hook, pulling out the left side of the paper tray. (Release the left side first, then the right side.)
2) Release the hook, pushing the both sides of the paper output tray.
* After lifting the printer's left side, release the hook (the left hook first) with the paper output tray declined.
Front Cover removal
1) Remove the screw from the bottom face.