Xerox Phaser 6121MFP Service Manual page 328

Service Parts Disassembly
8-8
3. Position the removed Imaging Unit as shown.
Note
Keep the Imaging Unit horizontal and place it where it can not become
dirty.
Note
Do not leave the Imaging Unit removed for more than 15 minutes, and do
not place the removed Imaging Unit in a location where it is exposed to
direct light (such as sunlight).
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Phaser 6121MFP Service Manual