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Phaser 840 and 850 Color Printers
7.
Ensure that the cap/wipe/purge heater is operational. Verify that the heater
resistance is 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.
8.
Another way to evaluate a cap/wipe/purge assembly gasket leak is to
examine the 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.
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.
Maintenance tray showing good purge
Summary of Contents for Phaser 840
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Page 65: ...54 Phaser 840 and 850 Color Printers ...
Page 101: ...90 Phaser 840 and 850 Color Printers ...
Page 125: ...114 Phaser 840 and 850 Color Printers ...
Page 134: ...Service Guide 123 Clearing PostScript NVRAM menu item ...
Page 135: ...124 Phaser 840 and 850 Color Printers ...
Page 166: ...Service Guide 155 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 9 9 ...
Page 170: ...Service Guide 159 Figure 3 Paper path FRUs 0388 80 2 1 5 11 10 9 12 6 4 3 7 13 8 11a 11b ...
Page 172: ...Service Guide 161 Figure 4 Motor and fan FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 174: ...Service Guide 163 Figure 5 Circuit board FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 81 12 7a ...
Page 176: ...Service Guide 165 Figure 6 Solenoid and clutch FRUs 4 5 3 2 1 0388 23 ...
Page 182: ...Service Guide 171 Figure 9 High capacity PaperTray 0388 65a 1 2 ...