Top-Of-Forms Service Check

	FRU	Action

1	Top-Of-Form	Check that the top-of-form sensor and its flag
	Sensor	are properly installed and are not damaged.

2	Logic Board	Remove the paper and set the paper select
		lever to the cut sheet position and turn the
		printer on.
		Measure the voltage between logic board
		connector CN6-2 (TOF signal) and CN6-1
		(GND). You should receive the following
		voltage readings:
		• When there is paper in the printer the
		voltage should be 0 V dc.
		• When there is no paper in the printer the
		voltage should be 5 V dc.
		Replace the top of form sensor if the voltage is
		incorrect.
		Replace the logic board if the voltage is
		correct, and reset the “Bidirectional Print
		Adjustment” on page 4-4.

2-32Service Manual

Lexmark 24XX-100 manual Top-Of-Forms Service Check