Repair information 4-19
5025-2xx, 4xx
Controller board removal
See “Controller board—C544n, C544dn, C544dw” on page 7-7 or “Controller board—C540n, C543dn” on
page 7-7 for the part number.
Warning: Observe all ESD precautions while handling electrostatic-discharge sensitive parts. See “Handling
ESD-sensitive parts” on page 4-1.
Warning: Replace one of the following components, and perform a POR before replacing a second
component. Never replace both of the components without performing a POR after installing each
one, or the printer may be rendered inoperable:
• Operator panel assembly
• Controller board
Warning: Never install and remove components listed above as a method of troubleshooting components.
Once a component has been installed in a printer, and the printer is powered on, it cannot be
used in another printer. It must be returned to the manufacturer.
1. Remove the rear shield. See “Rear shield removal” on page 4-11.
2. Disconnect all the cables from the controller board.
3. Remove the nine screws (A) that are securing the controller board.
4. Remove the board.
CAUTION
After disconnecting the high-voltage power cable from the controller board, always check that
the HVPS connector was not loosened. Make this check anytime you are working near the
HVPS cable.
CAUTION
This product contains a lithium battery. THERE IS A RISK OF EXPLOSION IF THE BATTERY
IS REPLACED BY AN INCORRECT TYPE. Discard used batteries according to the battery
manufacturer’s instructions and local regulations.
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