Maintenance Tray Showing Good Purge - Xerox Phaser 840 Service Manual

Ensure that the cap/wipe/purge heater is operational. Verify that the heater resistance is
7.
about 350 ohms (+/- 50). Inspect inside the cap for ink build up; a lot of built up ink
inside the cap indicates that the heater is not melting it out. The ink built up interferes
with the wiper compressing, and can prevent the cap/wipe/purge assembly from
sealing on the printhead.
Another way to evaluate a cap/wipe/purge assembly gasket leak is to examine the
8.
distribution of ink in an empty waste bin following a purge cycle. When the system is
sealing properly, a purge cycle produces approximately 18 mm (3/4 in.) of ink across
the waste tray.
The purge mass for the Phaser 860 will be approximately half the
Note
volume, due to new ink saving features.
Fig 3-5 Maintenance tray showing good purge
If the vacuum system suffered from low vacuum, either caused by a
poorly-sealed gasket, a failing vacuum pump or a clogged vacuum tube, then
you will see significantly less waste ink in the waste tray.
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