Lexmark Optra C Service Manual - Page 62
No AC Power/Dead Machine, ON/Off switch. Check the AC line wiring. Replace
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5045-001 No AC Power/Dead Machine FRU 1 On/Off switch connector 2 Power supply 3 Power cord 4 Circuit breaker (CB1) 5 Wiring, power supply unit Action Be sure connector J6, see "Connector Locations" on page 5-14, is connected into the LVPS. This connector will sometimes fall off the LVPS when working in this area. Check voltage at the outlet. Inform the user that rated voltage is not supplied at the outlet. Is the power cord firmly plugged into the printer, the paper feeder and the outlet? Replug it. Is the circuit breaker OFF? Press the button to reset the breaker. If the circuit breaker turns OFF again immediately after turning the power switch ON, check whether the AC power supply line is shorted. Note: This circuit breaker, labeled CB1 is in the LVPS, directly above the power cord connector. The button can be viewed without removing the power supply from the machine. Look in the lowest hole toward the front of the machine. This hole is oblong. Unplug the power cord. Check the continuity of the ON/Off switch. Check the AC line wiring. Replace the power supply unit. 2-30