Usb Service Check - Lexmark C540n Service Manual

Step Questions / actions
Print a menu settings page.
8
Note: If two option trays are used, the 650
sheet will appear as tray 2, and the 550 sheet
tray will appear as tray 3.
Are all the attached option trays listed on the
first page of the menu settings pages?
1. Remove the 650 sheet tray from the printer
9
2. Attach the 550 sheet tray directly to the
printer
3. Print a page from the 550 sheet tray.
Did the page print?
With only the 650 sheet tray attached to the
10
printer, print a page from the 650 sheet tray.
Did the page print?
1. Turn off the printer.
11
2. Remove the rear shield.
assembly removal" on page
3. Disconnect the cable at JOPT1 on the
controller board.
4. Turn the printer on.
5. Measure the voltages below:
Pin
2
3
5
6
7
9
10
Are the voltages correct?

USB service check

Step Questions / actions
Is the USB cable properly connected to the
1
printer and host PC?
Try a different USB cable.
2
Does this fix the issue?
Connect a different device to the USB cable.
3
Did the host PC see the device?
see
"Top cover
4-13.
JOPT1
Voltage
Ground
Ground
+24V
Ground
+5V
Ground
Ground
Yes
Go to step 9.
Go to step 11.
Go to step 11.
Consult your next level
support.
Yes
Go to step 2.
Issue fixed.
Replace the Controller
board.See
"Controller
board removal" on
page 4-20.
5025-2xx, 4xx
No
• If the 550 sheet option
failed to appear, go to
step 9.
• If the 650 sheet tray
failed to appear, go to
step 10.
Replace the 550 sheet tray.
Replace the 650 sheet tray.
Replace the controller
board. See
"Controller
board removal" on
page 4-20.
No
Properly connect the cable
at both ends.
Go to step 3.
There is an issue with the
host machine.
Diagnostic information
2-57
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