Lexmark 2380 - Forms Printer B/W Dot-matrix, Service Manual

Page: 63 / 204

Diagnostic Information 2-39
Top of Forms Problem Service Check
Note: This service check applies to the 23XX-002 and 23XX-003
printers only. 23XX-001 machines have a single paper sensor that
serves as a paper empty sensor and also determines the top of form
setting. For top of forms problems on 23XX-001 printers, refer to the
“Paper Empty Sensor Service Check” on page 2-26 .
23XX-002 and 23XX-003 machines have two sensors:
•
The left sensor is paper empty.
•
The right sensor is top of form.
FRU Action
1 Top of Form
Sensor Check that the top of form sensor and its flag
are properly installed and are undamaged.
2 Main Logic Board Remove the paper and set the paper select
lever to the cut sheet position and turn the
power on.
Measure the voltage between main logic board
CN8-2 (TOF signal) and CN8-3 (GND).
• 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 sensor if the voltage is incorrect.
Replace the main logic board if the voltage is
correct and there is still a problem.
Reset the “Bidirectional Print Adjustment” on
page 4-5.
23xx.bk Page 39 Wednesday, March 13, 2002 10:42 AM