Front Door Sensor Or Switches Service Check - Lexmark C540n Service Manual

5025-2xx, 4xx

Front door sensor or switches service check

Step Questions / actions
1 Enter Diagnostics Menu (turn the printer off,
press and hold
and then release the buttons when the
installed memory and processor speed
displays).
Perform the Base Sensor Test. See
Sensor Test" on page
1. Select Base Sensor Test, and press
Select ( ).
2. Select Front Door, and press Select (
3. Open and close the front door, and
observe the display.
Does the display indicate Value Closed with
the door closed and Value Opened with the
door opened?
2 Open the front door, and check the thin, tall,
plastic web (pivot plate) at the top right of the
printer. With the other covers in place and
closed, this web interacts with switches in the
door.
Open the toner cover, and check the motion of
the web. Is the web loose, damaged, or
missing?
3 Open the toner door, and inspect the vertical
web that pushes and rotates the pivot plate.
Is it damaged?
4 With the front cover open, inspect the two
switches. Using a tool, such as a spring hook,
push the metal arms to check the movement.
Is there any damage to the switches or the
surrounding area?
5 Turn the printer off, and remove the rear
shield. See "Top cover assembly removal"
on page 4-13. Turn the printer on, and verify
the following values at JINT1 and JCVR1:
JINT1
Pin Value
1 +5 V dc
2 Ground
Are the values approximately correct?
2-26
Service Manual
and , turn the printer on,
"Base
3-16.
).
JCVR1
Pin Value
1 +24 V dc
Yes
Sensor, toner door, and
right doors are OK.
Replace the right cover
assembly. See "Right
cover assembly removal"
on page 4-12.
Replace the top cover
assembly. See "Top cover
assembly removal" on
page 4-13.
Replace the right cover
assembly. See "Right
cover assembly removal"
on page 4-12.
Go to step 6.
No
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Replace the controller
board. See "Controller
board removal" on
page 4-20.