Lexmark Forms Printer 2400 Service Manual - Page 50

Top-Of-Forms Service Check, voltage readings

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24xx Top-Of-Forms Service Check FRU 1 Top-Of-Form Sensor 2 Logic Board Action Check that the top-of-form sensor and its flag are properly installed and are not damaged. 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. 2-32 Service Manual

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2-32
Service Manual
24xx
Top-Of-Forms Service Check
FRU
Action
1
Top-Of-Form
Sensor
Check that the top-of-form sensor and its flag
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
.