Lexmark 250d - E B/W Laser Printer, Руководство по обслуживанию

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Diagnostic information
2-43
4512-220, -230
Operator panel service check
Inspect the operator panel cable for damage. Make sure the cable is plugged in securely. Run POST, and check
each light for proper operation. See
“Power-On Self Test (POST) sequence” on page 2-2
.
Paper feed service checks
Paper jam error indication during POST
Media picks during POST and/or continuously
LED Operator panel service check
FRU Action
Operator panel (LED)
Controller card
Warning:
Do not
replace the operator
panel and controller
card at the same time.
Each card contains the
printer settings. When
either of these cards is
new, it obtains the
settings from the other
card. Settings are lost
when both are new
and replaced at the
same time.
Lights
If none of the lights come on, open the controller card cage and locate the operator panel
connector at J3. Make sure the cable is properly connected to the controller card and the
controller card has input voltage to it.
With the printer on, verify the following without disconnecting the cable:
• Pins 1, 3, 5, and 6–3.3 v
• Pin 2–5 v
• Pins 4 and 7–GND
If these are correct and the operator panel is not functioning, replace the operator panel.
If any are incorrect, see “Controller card service check” on page 3-39 .
Buttons
If the buttons do not respond, replace the operator panel. There is no test or repair for the
faulty switches.
FRU Action
Fuser (exit sensor) If the exit sensor flag, which is visible at the back of the fuser, is in any position other than
vertical, the printer will display a paper jam. Make sure the flag is operating freely. Replace
the fuser if the sensor is damaged.
Input/duplex sensor
Manual feed sensor Make sure the input paper feed sensors are working properly. A stuck or incorrectly installed
sensor causes a paper jam.
FRU Action
ACM
Manual feed clutch Check the ACM clutch for wear. The solenoid interacts with the clutch to control the motion
of the pick tires.
If the ratchet teeth of the ACM clutch assembly are worn or broken, the solenoid may not
stop the ACM from rotating. Replace the ACM clutch assembly if necessary.
Check the manual feed clutch for damage.