Print Speed Service Check; Printhead Service Check - Lexmark 2591+ Service Manual

Print speed service check

The speed of the 2500+ printers varies with the font, forms thickness setting, and printhead temperature.
Graphics output may print slowly due to data throughput limitations. Thermal sensing is built into the printhead
on 2500+ printers and protects the printhead from overheating.
Step FRU
1 Head Gap sensor

Printhead service check

Step FRU
1 Printhead cables
Printhead
2 Carrier shaft
Carrier unit
Platen assembly
Printhead nose
Ribbon guide
Action
Check the function of the Head Gap sensor by turning the printer on while
pressing the Macro button. Open the operator panel to the second level and do
the following:
• With the Forms Thickness lever at 1, Macro LED 1 lights.
• With the Forms Thickness lever at 2 and 3, Macro LED 2 lights.
• With the Forms Thickness lever at 4 through 7, Macro LED 3 lights.
Disconnect the Head Gap sensor from connector J4 on the logic board. Place
the Forms Thickness lever in position 1 and verify continuity at the following pin
locations:
• J4 - 3 and J4 - 4
• J4 - 4 and J4 - 5
Place the Forms Thickness lever in positions 2 and 3 and verify continuity at the
following pin location:
J4 - 3 and J4 - 4
Verify that there is no continuity at Forms Thickness lever positions 4 through 7.
Action
If the printout contains missing or extra dots or lines, do the following:
• Check the continuity and connection of the printhead cables and the short
flexible cable.
• Be sure the voltages to the logic board are correct.
If dots are missing:
• Perform the print test to determine which wire is not firing.
• Remove the printhead, and verify that no pins on the printhead are broken or
missing. If pin(s) are missing, replace the printhead.
• Check the continuity of the printhead cable pins. Be sure no pins have
continuity to the printhead housing.
If the printout does not contain missing or extra dots or lines, be sure the
printhead is securely installed in the carrier and perform the
platen gap adjustment" on page
Check and replace worn or damaged parts.
2580+, 2581+, 2590+, 2591+
"Printhead-to-
4-2.
Diagnostic information
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