Lexmark W820 Service Manual - Page 16

4025-Finisher Principles of Operation Finisher Power The Base Engine supplies 120VAC to the Finisher, and the Finisher Power Supply converts it into 24VDC and 5VDC that are necessary for the Finisher to function, and sends these voltages to it. The printer AC power cord plugs into a grounded AC electrical outlet. The cord carries AC line voltage to the 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 Finisher Power Supply. The Finisher Power Supply converts the 120 V ac to regulated +5 V dc and +24 V dc voltages. The Finisher Power Supply sends these voltages to the Finisher PWB. The Finisher PWB uses these voltages to run internal logic, sensors, clutches, and motors within the Finisher. 1-4 Service Manual