Lexmark C746n Service Manual page 145

Step Questions / actions
Remove the left cover. See
3
removal" on page
Reseat then and check all the toner level
sensor cables (A) connected to the rear of the
HVPS for damages and if they are installed
correctly.
Does the problem persist?
Connect four new toner level sensors outside
4
the machine and perform a POR.
Note: Keep track of which sensors change
the error code to reduce the number of failing
sensors. Keep the old sensor which does not
reduce the failing number, leaving three new
sensors and no error reported.
Does the problem persist?
Replace the HVPS board. See
5
power supply (HVPS) removal" on
page 4-123.
Does the error clear?
1. Install the old HVPS back to the machine.
6
2. Replace the HVPS cable. See
voltage power supply (HVPS) cable
removal" on page 4-125
Does the problem persist?
"Left cover
4-31.
"High-voltage
"High-
Yes
Go to step 4.
Go to step 5.
Problem resolved.
Replace the system board.
See
"System board
removal" on page 4-163.
5026
No
Problem resolved.
Replace the failing toner
level sensors. See
"Toner
level sensor removal" on
page 4-171.
Go to step 6.
Problem resolved.
Diagnostic information
2-107
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