Lexmark Optra C710 Service Manual - Page 113

5016-001 B 922 Fuser Error displays. FRU 1 Interlock Switch Mechanism 2 Interlock Switch S2 Action Check the interlock switch actuator hardware for proper operation making sure of the following: • Actuator 1 activates door switch S2. • There is +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. Switch S2 has two functions. Two terminals control +24 V dc to the engine board and four terminals control AC line voltage to the fuser lamps. Terminal A1, B1, A2 and B2 control AC line voltage to the fuser lamps. When this circuit opens, a 922 service error displays. CAUTION: Be careful when checking the voltages on switch S2, as AC line voltage may be present on terminals A1 (brown) B1 (yellow), A2 (brown) or B2 (yellow). Check the voltage between terminals A1 (brown) and B1 (yellow). The voltage should read the same as the AC line voltage. Note: The lamp voltage varies as the fuser lamp turns on and off, or when power saver is selected. • If incorrect, go to the "Printhead Service Check" on page 2-77. • If correct, check, the voltage across terminals A2 (brown) and B2 (yellow). The voltage should read the same as the AC line voltage. • If incorrect, check the switch for continuity and proper operation. • If correct, disconnect the power cord and check continuity between switch terminals A2 and B2. • If incorrect go to the "Fuser Cold Service Check" on page 2-51. Diagnostic Information 2-47