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2-28 Service Manual
24xx
Print Speed Service Check
The speed of the 24xx 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 249x printers and protects the printhead from
overheating.
6 Logic Board If no problem is found with the other
components, but the power problem still
remains, replace the logic board and reset
“Bidirectional Print Adjustment” on
page 4-4.
FRU Action
1 Head Gap Sensor Check the function of the head gap sensor by
turning the printer on with the Macro button
pressed. 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 CN4 on the logic board. Place the
forms thickness lever in position 1 and verify
continuity at the following pin locations:
CN4 - 1 and CN4 - 2
CN4 - 2 and CN4 - 3
Place the forms thickness lever in positions 2
and 3 and verify continuity at the following pin
location:
CN4 - 1 and CN4 - 2
Verify no continuity at forms thickness lever
positions 4 through 7.
FRU Action