Lexmark C720 Service Manual - Page 152

5024-001 Options No Power Service Check FRU • Lower Feed Unit Installation Cable • Main Engine (MCTL P.W.B.) Board. • Duplex Unit Installation Cable • Duplex (DUP P.W.B.) Board • Main Engine (MCTL P.W.B.) Board • Low Voltage Power Supply (LVPS) Action Note: If any paper handling options (250 tray or duplex unit) are installed, disconnect or remove the options and check the base printer for correct operation. If the printer operates correctly, reinstall one option at a time to isolate the device. If the lower feed unit is the problem: • Ensure the lower feed unit is connected to the printer. • Check that the lower feed unit installation cable for damage and replace, if necessary. • Ensure connector DCN8 on the main engine (MCTL P.W.B.) board is connected. Replace, if necessary. • If the duplex unit is the problem: • Ensure the duplex unit is connected to the printer. • Check the duplex unit Installation Cable for damage and replace, if necessary. • Ensure connector DPCN, on the main engine (MCTL P.W.B.) board is connected. • Ensure connectors ACN4 and ACN1 on the low voltage power supply (LVPS) are connected. • Ensure connectors DPCN1 and DPCN6, on the duplex (DUP P.W.B.) board are connected. • Replace the duplex (DUP P.W.B.) board. • Replace the main engine (MCTL P.W.B.) board. • Replace the low voltage power supply (LVPS). 2-72 Service Manual