Lexmark C720 Service Manual - Page 149
—High Voltage Power Supply Unit (HVU) Service Check, High Voltage Unit HVU
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5024-001 997-High Voltage Power Supply Unit (HVU) Service Check FRU 1 OPC Belt Cartridge 2 High Voltage Power Supply (HVU) 3 • IOD1 P.W.B. Board • Main Engine (MCTL P.W.B.) Board Action Ensure the charge unit, on the belt cartridge, is installed correctly. Check the charge corona wire for a cut or short. Replace the OPC belt cartridge, if necessary. Note: This is a customer orderable part. Turn the printer Off and unplug the power cord. Ensure proper contact between the high voltage power supply and all CHV output and contact terminals on the high voltage power supply (HVU). If any parts are dirty or damaged, clean or replace the high voltage power supply unit (HVU). If the problem still exists, replace the IOD1 P.W.B. board. If the problem is present, replace the main engine (MCTL P.W.B.) board. High Voltage Unit HVU Diagnostic Information 2-69
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