This 9-pin mailbox connects electrically to the finisher with a 14-pin drawer connector. When a print job starts, the main motor turns on to rotate all rollers, and the specified bin receives the paper. The transport roller [A] transports the paper to each bin, and then the exit roller [B] outputs the paper to each tray [C].
When the junction gate solenoid [A] turns on, the gate [B] switches and the tray receives the paper. When the uppermost tray is selected, all solenoids stay off. When the last paper's trailing edge passes the tray overflow sensor and the sensor turns off, the paper has gone to the tray, so the selected tray's junction gate solenoid and the main motor turn off. Normally, the speed of paper transport in this unit is nearly the same as in the finisher.