Xerox 6120 用户手册

If a hard disk is installed, fonts can be downloaded and saved, and the 
overlay function can be used.

It’s very important to protect the printer controller board and any associated 
circuit boards from electrostatic damage. Before performing this procedure, 
review the antistatic caution on Page 136. In addition, always handle circuit 
boards by the edges only.

1 Turn off the printer and disconnect the power cord and interface cables.

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2 Using a coin, remove the screw on the back of the printer.