Lexmark C792de, Service Manual

Page: 190 / 630

3-12
Service Manual
5062
Drift Sensors
This check is used to display the status of the thermal system used to compensate for printhead drift.
To perform the test:
1.
From the Diagnostics menu, navigate to:
Alignment Menu > Drift Sensors
2.
Select a color to test.
Test results:
•
If
Error
appears, replace the system board. See “System board removal” on page 4-142 .
•
If a number, Open, or Short appears, check the following:
a.
Check the cable of the appropriate thermistor (cyan, magenta, yellow, or black) to make sure it is
installed correctly to the system board and to the thermistor board. If correct, go to step b.
b.
Check the continuity of the appropriate cable. Replace the cable if there is no continuity. If continuity
is correct, go to step c.
c.
Replace the appropriate thermistor assembly. If this does not fix the problem, replace the system
board.
Press Stop (
X
) to return to the Alignment Menu.
MISC TESTS
Toggle ITU
The test is used to verify that ITU belt retraction, BOR, hardware is functioning properly. Two options are
available: Raise Belt and Lower Belt. If the belt is already in the requested position, no action occurs. Otherwise
the belt will move to the requested position.
1.
From the Diagnostics menu, navigate to:
MISC TESTS > Toggle ITU
2.
Select Raise Belt or Lower Belt from the menu.
Raise ITU Testing… or Lower ITU Testing… appears.
3.
The results appear on the display. For example: Lower ITU Test Passed . To exit the test, press any
button.
Printhead Inst
This test prints a page that aids in the mechanical alignment of the printhead. This test should not be used
independently of the printhead coarse alignment. See
“Installing and coarse aligning the printhead” on
page 4-121 .
Value: Description:
OK Communication is good
Error RIP to A/D communication error
Open Open thermistor error
Short Short thermistor error
Range Range error
Number Detected temperature in Celsius of last
reading. Indicates the system is functioning
properly.