Ricoh H545 Operator's Manual page 170

Installation
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"
8
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TSTC130N