Drift Sensors; To Exit The Test, Press Return Or Stop; Top Fine Mar Adj; Misc Tests - Lexmark C750 Service Manual

5060-00x

Drift Sensors

This check is used to display the status of the thermal system used to compensate for printhead drift.
The following screen is displayed when the test is selected:
Com=aaaa
C=cc
Values:
If:
Com=
M=, C=, Y=, or K=
If Com=Err, replace the system board. See
If a number displays, or C, Y, or K=OP, or SH, check the following:
1.
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 2.
2.
Check the continuity of the appropriate cable. Replace the cable if there is no continuity. If continuity is
correct, go to step 3.
3.
Replace the appropriate thermistor assembly. If this does not fix the problem, replace the system board.

To exit the test, press Return or Stop.

TOP FINE MAR ADJ

Do not change this setting without consulting your next level of support.

MISC TESTS

Motor Detect

This test initiates an Automated Motor Detection. It must be performed if the NVRAM contents are erased such
as when a RIP or engine board has been replaced. This test must be performed anytime the ITU motor, Fuser
motor, or Cartridge drive motors are replaced.
To run the Miscellaneous Tests:
1.
Select Misc Tests from the Diagnostics Mode.
2.
Select Motor Detect.
3.
Remove all the print cartridges from the printer.
4.
Press Go.
Motor Detection in progress is displayed:
The test lasts approximately ten seconds. No buttons are active during detection and the test completes
automatically.
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Service Manual
M=bb
Y=dd K=ee
Value: Description:
Err RIP to A/D communication error
Good Communication is good
OP Open thermistor error
SH Short thermistor error
RA Range error
Number Detected temperature in Celsius of last
reading. Indicates the system is functioning
properly.
"System board" on page 4-80.