Sir Zeppo . . . . .
Looks like YOUR speeeee-cific unit has belt driven tray loading / unloading.
Also you are going to have to crack some eggs to make that omelet . . . .specifically . . .to pull off the top dust cover . . . to be able to initially see if there is no drag / fiction point where the tray mates with the front panel / cover.
THEN . . . .
Motor item 13 rotates in the load / unload direction and spins square cut belt item 9 , that is also riding in the top grooving of geared pulley item 8.
Gear 8 rotates and has its inner gearing meshing with geared pulley item 6's peripheral gearing.
Inner gearing spindle of item 6 meshes with the . . .YELLOW
MARK-UP . . . linear geared rack of the item 12 tray to either run it in or out . . .accordingly.
Your belt may have loosened and is sagging and producing no mechanical coupling.
Your belt may have broken and is loose inside.
Your belt may have sagged and dropped one end down.
mark in is an accessible entry slot where you might enter the eraser end of a pencil, inside to provide a wee bit of mechanical assistance, if you initially hear a slipping and spinning sound.
It might then cycle, with just that additional initial assist.
Thaaaaaasssssss-it . . . . . . tell us what you find and your degree of progress.
MECHANICAL BLOWUP . . . . .
73's de Edd
. . . . . . . . . . .
Be . . . . . .THE . . . perfect man . . . . .
Don't ask a girl where she wants to eat.
Tell her to guess where you are taking her to eat, then immediately take her to the first guess.