Xerox 1200 User Manual page 122

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Chapter 9
To connect the document feeder:
Switch off the scanner and then switch off your Macintosh computer.
Power switch.
"O" is off and
"I" is on.
Devices connected through SCSI cables require a certain power-on sequence.
See "Switching the Power On," in Chapter 2, for more information.
Grip the scanner top cover on both sides and lift it off.
Put the original cover away in a safe place for future use. The document
feeder replaces the cover.
Grasp cover here.