3/99DocuPrint N24, N32 and N40 Service Manual 8-117 Options8.2.6 Mailbox Principles of Operation8.2.6.1 Mailbox ControlThe base engine Printer Engine Controller PWB provides the +5VDC and +24VDC that the Mailboxrequires for operation.The printer AC power cord plugs into a grounded AC wall outlet. The cord transmits AC line voltage tothe Noise Filter PWB. The Noise Filter smooths the AC voltage and sends it to the Main Power Switch.Switching on the Main Power Switch applies AC voltage to the Low Voltage Power Supply (LVPS) PWB.The LVPS converts the 110VAC to regulated +5VDC and +24VDC voltages. The LVPS sends thesevoltages to the Printer Engine Controller PWB. The MCU sends these two DC voltages to the SorterControl PWB. The Sorter Control PWB uses these voltages to run internal logic, sensors, solenoids, andthe motor within the Mailbox.Mailbox Control is a broad term that is used to describe the printer resources that monitor and control theactions and operations of the printer and the Mailbox; from bin output to error detection.The center of Mailbox control is the Mailbox Control PWB. The Printer Engine Control PWB provides thelogic and information processing that is necessary for the printer to function, and the Mailbox ControlPWB provides the logic and information processing that is necessary for the Mailbox to function. Everyelectrical component within the Mailbox is connected to the Mailbox Control PWB. Sensors in theMailbox send paper travel status information to the Mailbox Control PWB. The Mailbox Control PWBprocesses that information and shares it with the Printer Engine Control PWB. Acting on the results ofthe processing, the Mailbox Control PWB sends commands to the various Mailbox components;switching on the motor or switching off a bin solenoid.
