Transfer Roll Service Check; Tray (X) Sensor Service Check - Lexmark C540n Service Manual

5025-2xx, 4xx

Transfer roll service check

Step Questions / actions
Remove the ITU. See
1
(ITU) removal" on page
contacts between the HVPS and the ITU.
Clean the contacts and recheck.
Does the error recur?
Does the new ITU fix the problem
2
Turn the printer off, and remove the rear
3
shield. See
"Top cover assembly removal"
on page 4-13.
Turn the printer on, and check the cable at
JHVPS1 connector on the controller board
without disconnecting it.
Verify the following voltage values:
Pin
7
10
11
13
14
16
Are the values approximately correct?

Tray (x) sensor service check

Step Questions / actions
When the printer is in Ready state, pull the
1
standard tray out. The display should indicate
Tray (x) Missing. Reinsert the tray.
Does the message remain on the display?
Service Manual
2-54
"Image transfer unit
4-44. Check the
JHVPS1
Voltage
+3.3 V dc
+3.3 V dc
+3.3 V dc
+24 V dc
Ground
Ground
Yes
Replace the ITU. See
"Image transfer unit (ITU)
removal" on page 4-44.
Go to step 2.
Problem resolved.
Replace the HVPS. See
"High-voltage power
supply (HVPS) assembly
removal" on page 4-38.
Yes
Go to step 2.
No
Problem resolved.
Go to step 3.
Replace the controller
board. See
"Controller
board removal" on
page 4-20.
No
Go to step 4.
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