Controller board removal
Note: If you are replacing the controller board, retain the flash card from the original controller board so that you
can use it with the replacement controller board.
Warning—Potential Damage: When replacing the control panel, control panel board, or controller board, replace
only one component at a time. Replace the required component and perform a POR before replacing a second
component. If this procedure is not followed, the printer will be rendered inoperable. Never replace both the control
panel and the controller board without a POR after installing each one or the printer will be rendered inoperable.
Never install or remove these components as a method of troubleshooting while operating in normal user mode.
See “Controller board/control panel replacement” on page 268.
Warning—Potential Damage: When a component has been installed in a machine and has been powered up in
normal user mode, it cannot be used in another machine; it must be returned to the manufacturer. The machine
must be powered up in Diagnostic mode or the controller board, control panel boards, or control panel will become
locked.
CAUTION—POTENTIAL INJURY: This product contains a lithium battery. There is a risk of explosion if the battery
is replaced with an incorrect type. Discard used batteries according to the battery manufacturer’s instructions
and local regulations.
1 Remove the right cover. See “Right cover removal (MX71x)” on page 311.
2 Remove the rear lower cover. See “Rear lower cover removal” on page 309.
3 Remove the LVPS. See “LVPS removal” on page 403.
4 Remove the left cover. See “Left cover removal (MX71x)” on page 301.
5 Remove the controller board access shield. See “Controller board access shield removal” on page 388.
6 Disconnect all cables from the controller board.
7 Remove the six screws (B) securing the controller board to the machine.
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Repair information
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