Lexmark C752 Service Manual page 123

Step Actions and questions
3 Go to "Base Sensor Test" on page 3-30
the magenta TMC sensor. When you press the TMC
pin in the magenta cartridge contact assembly make
sure it actuates the TMC switch on the developer
HVPS. When the TMC pin is pressed in you hear a
click when the switch actuates. Check for mechanical
interference between the contact block and the
developer HVPS.
Note: You may need to turn the printer off to hear the
click.
Does the magenta TMC switch on the developer HVPS
board actuate properly when the TMC pin is pressed?
4 Check the developer HVPS board to make sure it is not
cracked or broken.
Is the developer HVPS cracked or broken?'
5 Check the mounting of the developer HVPS. Make
sure the screws that mount the power supply are
properly tightened down and the board is positioned
and mounted correctly.
Is the developer HVPS mounted correctly?
6 Make sure the developer HVPS cable is correctly
installed on the developer board assembly.
Is the cable correctly installed?
7 Make sure the developer HVPS cable is correctly
installed at J20 on the system board.
Is the cable properly installed?
8 Check the voltage at connector J14-6 on the system
board while pressing the magenta TMC pin in the
cartridge contact assembly.
Does the voltage change when the pin is pressed?
9 Check the voltage at connector J14-6 when the
magenta TMC switch is pressed.
Does the voltage measure approximately +3.3 V dc?
10 Check the developer HVPS to system board cable for
damage, broken connections, or wire and shorts
between adjacent pins.
Are there any signs of damage to the cable?
11 Disconnect the developer HVPS cable from connector
J14 on the system board. Measure the voltage on
connector J14-6 on the system board.
Does the voltage measure approximately 0 V dc?
Yes
and check Replace the
cartridge.
Go to step 6
Replace the
"Developer
HVPS board" on
page 4-30.
Go to step 7
Go to step 8
Replace the
"System board"
on page 4-67.
Go to step 10
Replace the
cable.
Replace the
"System board"
on page 4-67.
5060-2XX
No
Go to step 4
Go to step 5
If the board is
incorrectly
installed, install it
correctly. Make
sure all the
mounting screws
are tightened
down. Recheck
the printer to see
if a 941 Error is
still displayed.
Correctly connect
the cable.
Correctly connect
the cable.
Go to step 9
Go to step 11
Replace the
"Developer
HVPS board" on
page 4-30.
Replace the
developer HVPS
and developer
HVPS to system
cable.
2-89
Diagnostic information