Lexmark C 540n, Service Manual

Page: 88 / 262

2-54
Service Manual
5025-2xx, 4xx
USB service check
8 Print a menu settings page.
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?
Go to step 9. • If the 550 sheet option
failed to appear, go to
step 9.
• If the 650 sheet tray
failed to appear, go to
step 10.
9 1. Remove the 650 sheet tray from the printer
2. Attach the 550 sheet tray directly to the
printer
3. Print a page from the 550 sheet tray.
Did the page print?
Go to step 11. Replace the 550 sheet tray.
10 With only the 650 sheet tray attached to the
printer, print a page from the 650 sheet tray.
Did the page print?
Go to step 11. Replace the 650 sheet tray.
11 1. Turn off the printer.
2. Remove the rear shield.
see “Top cover
assembly removal” on page 4-13 .
3. Disconnect the cable at JOPT1 on the
controller board.
4. T urn the printer on.
5. Measure the voltages below:
Are the voltages correct?
Consult your next level
support. Replace the controller
board. See
“Controller
board removal” on
page 4-20
.
Step Questions / actions Yes No
1 Is the USB cable properly connected to the
printer and host PC? Go to step 2. Properly connect the cable
at both ends.
2 Try a different USB cable.
Does this fix the issue?
Issue fixed. Go to step 3.
3 Connect a different device to the USB cable.
Did the host PC see the device?
Replace the Controller
board.See
“Controller
board removal” on
page 4-20
.
There is an issue with the
host machine.
Step Questions / actions Yes No
JOPT1
Pin Voltage
2 Ground
3 Ground
5 +24V
6 Ground
7 +5V
9 Ground
10 Ground