Service Checks; Controller Card Service Check - Lexmark E120 Service Manual

4506-1xx

Service checks

Service checks which involve measuring voltages on the LVPS/HVPS (low voltage power supply/
high voltage power supply board) should be performed with the printer positioned on its back side.
Note: When you make voltage readings, always use frame ground unless another ground is
specified. See the wiring diagram in the back of the book for more information.

Controller card service check

FRU
Controller card
assembly
Warning: Do not
replace the operator
panel and controller
card at the same time.
Each card contains the
printer settings. When
either of these cards is
new, it obtains some of
the settings from the
other card. Settings
are lost when both are
new and replaced at
the same time.
2-24
Service Manual
Action
POST (Power-On Self Test)
Note: The printer should complete POST in approximately 30 seconds.
If the printer fails to display lights or activate the drive motor, fuser or fan, check
the following in order:
1. Power to the LVPS/HVPS
2. Power from the LVPS/HVPS to the controller card
3. Cables are plugged in correctly, especially for the operator panel. The printer
will not power-up without a functioning operator panel.
4. The controller card assembly.
5. The operator panel. See
"Operator Panel Service Check" on page 2-25.