Controller Board Replacement - Ricoh MP 7503SP Field Service Manual

4. Replacement and Adjustment
[1] IOB
• Before you touch a board, touch a metal surface to discharge accumulated static from your hands.
• Remove screws carefully so the tip of the screwdriver does not touch any part of the board.
• Handle boards carefully by their edges to avoid sharp edges and points on the backs of the
boards.
• To avoid electrical shock, never touch a component on the PSU or AC drive board. Some of these
parts retain an electric charge long after the machine has been turned off.

Controller Board Replacement

Before You Begin
• The photo below shows rear of the machine with the controller box cover removed.
• The controller board [A] is on the right, connected to the BICU [B] on the left.
• Each model in this series (D223, D224, D225) has a different controller board.
• If you install the wrong controller board, the machine will return SC955-03. The machine will not
operate until the correct controller board has been installed.
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