Xerox Phaser 8400 Service Manual page 267

5.
On the left side of the printer, pull the X-Axis bias spring and hook out slightly
and shift to the side (rotate down), see #1 and #2 of the following figure. Allow
the spring hook to rest against the detentes in the printer frame.
1.
6. Disconnect the air hose from the purge pump (see figure above).
Service Manual
Purge pump
Bias spring hook
2.
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