Lexmark Optra S Service Manual - Page 110
J4-2 Approximately +16 V dc
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4059-XXX FRU 4 Output Expander Control Board Level 1 Action Check the voltages at connector J4. Go to "Output Expander Control Board - Level 1 Stepper Motor" on page 5-22. Printer idle J4-1 +21 V dc to +24 V dc J4-2 +21 V dc to +24 V dc J4-3 +21 V dc to +24 V dc J4-4 +21 V dc to +24 V dc Printer Feeding Paper J4-1 Approximately +16 V dc J4-2 Approximately +16 V dc J4-3 Approximately +16 V dc J4-4 Approximately +16 V dc The voltage drops to approximately +16 V dc as the output expander bin stepper motor turns on and a sheet of paper is fed through the redrive into the output expander assembly. If any of the voltages fail to change, replace the output expander option board. If that does not correct the problem, replace the output expander mechanical linkage assembly. 2-83 4059 Service Manual