Lexmark E220 Service Manual - Page 95

4500 Cooling fan service check (E320/E322) FRU Cooling fan Action Make sure the cooling fan motor cable plug is properly seated on the engine board. Unplug the printer and disconnect the cooling fan cable on the engine board. Restore printer power. Within approximately 3 seconds the engine board should apply +24 Volts direct current (V dc) to the fan. See "Connector locations " on page 5-1 for more information. • If voltage is present, replace the cooling fan. • If voltage is not present, see the "Engine board service check (E320/E322) " on page 2-72 for more information. Service checks involve measuring voltages of the LVPS, high voltage power supply (HVPS), and controller card assembly. Continuity and resistance verifications are done on cables and components as required. Note: When looking at the printed side of a PCB, connectors are designated with "J" followed by a number. Pin 1 is designated on the PCB by an adjacent "1" or triangle. Pin numbers index sequentially to the opposite end of the connector. See "RIP controller (E220/E321/E323 only) " on page 5-8 for more information. Diagnostic information 2-65