Lexmark 5016-001 manual Coupling Unit Service Check

5016-001

Coupling Unit Service Check

A 990 Service Engine Error. The coupling does not turn.

B 990 Service Engine Error. The coupling motor turns.

C 991 Service Engine Error. Indicates a problem with the coupling on and off sensors.

Note: Verify correct operation of the mechanical parts of the coupling unit by manually resetting the coupling unit. Use the green coupling arm knob to reset the coupling unit and observe its operation.

A 990 Service Engine Error - Motor does not turn on.

	FRU	Action
1	Coupling Motor	Disconnect the coupling motor at the inline
	Cable MK2	connector and measure the resistance of the
		motor on the motor connector. It should
	Engine Board	measure between 9 and 15 ohms. If incorrect,
		replace the motor.
		The motor may be binding due to a problem in
		the motor mounting stay assembly. Remove the
		stay assembly and check for problems with the
		motor and coupling unit. Repair as necessary.
		If no problem is found and the motor does not
		turn, check cable MK2.
		•	If incorrect, replace the cable.
		•	If correct, replace the engine board.

2-42Service Manual