Lexmark 7003-050 X340n, Service Manual

Page: 46 / 162

Diagnostic information
2-25
7003-XXX
LVPS/HVPS service check
Main motor service check
FRU Action
LVPS/HVPS
LVPS portion of board
Fuses that open typically indicate a faulty LVPS/HVPS.
Use the voltage meter to verify the appropriate voltage at the MFP
end of the power cable.
Remove the LVPS/HVPS assembly from the MFP.
Check continuity on the fuses.
If either fuse has opened, replace the card.
Ensure the switch is off, and plug the power cord into the card.
Turn the switch on.
CAUTIONThe card has several points where AC voltage is
exposed.
Carefully verify the AC voltage between pins 1 and 2 matches the
power cable (wall) voltage.
• If voltage is incorrect, replace the card assembly.
• 24 V dc from pins 9 and 10 at CN201.
• If voltage is incorrect, replace the card assembly.
HVPS portion of board
Problems with the HVPS are exhibited in the print quality. See
“Print
quality service checks” on page 2-31 for more information.
FRU Action
Main motor cable
LVPS/HVPS
Controller card
24 V dc at J8, pin 8 and +5 V dc at pin 6 (controller card).
Verify ground at pins 2 and 7 for both the card and cable.
• If these voltages are correct, check the main motor cable for
continuity.
- Remove rear cover to access connector on motor.
- If continuity exists on each wire, call next level of service.
- If continuity does not exist on one or more of the wires,
replace the motor cable.
• If these voltages are not correct, see the “LVPS/HVPS service
check” on page 2-25 , or replace the controller card.
Note: The main motor is not a service part.
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