HP 2500C Series - Manual (Page 134)

Functional Overview 6-14
Paper Paths and Components
Output Tray Assembly
Output stack sensor
Output stack height has to be sensed to indicate the user that output tray is full so that
user can clear the printed media. Moreover , if the output stack height reaches beyond
certain limit (31mm from the seperator base to the ramp front side bottom end) it may
affect the ramp extension which inturn will disturb output media drying time / holding
distance.