Ricoh H545 - Manual (Page 170)

Installation
154
8
G
Lay the machine on top of the unit as shown.
H
Make sure the machine and unit fit together correctly. If they are not
aligned, the machine will not be able to detect the second cassette when
you try and change the paper size setting with function 36. See P.103
“Changing The Paper Size Settings”
TSTC130N