Lexmark Optra C710 Service Manual - Page 111
Cover Interlock Service Check, Door Open displayed
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5016-001 Cover Interlock Service Check Check that switches S2, S3, and S4 are open. These should be open anytime the cartridge, fuser or front covers are not latched properly. When a cover is opened, switch S2 opens the +24 V dc supply to the engine board and the AC line from the LVPS to the fuser lamps. Switches S3 and S4 open the +5 V dc supply from the engine board to the printhead. If Door Open displays, go to A. If a 922 Fuser Error displays, go to B. A Door Open displayed. FRU 1 Interlock Switch Mechanism Action Check the interlock switch actuator hardware for proper operation and be sure: • Actuator 1 activates door switch S2. • +5 V dc to interlock switches S3 and S4. If the mechanism does not operate properly or activate any of the switches, repair as necessary. Diagnostic Information 2-45