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Phaser 840 Color Printer
Inspection
Rollers:
Replace the rollers when you see any of the following defects:
■
Flat spots.
■
Out of roundness.
■
Cracked rubber.
■
Loss of traction (tackiness) causing pick or feed failures.
Gears:
Replace gears that show any signs of wear or breakage. Look for these
problems:
■
Thinned gear teeth.
■
Bent or missing gear teeth; check especially where a metal gear drives a
plastic gear.
■
Fractured or cracked gears. (Oil or incorrect grease on a plastic gear can
cause the gear to crack.)
Belts:
Inspect the belts for wear. There are eight rubber belts in the printer:
■
A belt from the process motor to the compound gear
■
Two belts from the y-axis motor drive
■
A belt from the lower paper feed roller to the upper paper feed roller
■
Two belts on the cap/wipe/purge drive
■
An exit roller drive belt
■
A small belt for driving the cap/wipe purge assembly from the cap/
wipe/purge clutch
Look for these problems:
■
Loose rubber particles below the belts indicate a worn belt.
■
Missing teeth in the belts.
■
Cracking or moderate fraying; a small amount of fraying is inevitable,
so look for other signs of wear before replacing the belt.
Clutches:
There are four clutches: the paper-pick roller clutch, the upper feed
roller clutch, the maintenance drawer cam clutch and the cap/wipe/purge clutch.
Symptoms of a malfunctioning clutch are the printer not picking paper from the
tray or other paper jams. Also the cap/wipe/purge system could fail. In such
cases, replace the clutch.
Summary of Contents for Phaser 840
Page 46: ...36 Phaser 840 Color Printer ...
Page 95: ...Service Guide 85 Clearing PostScript NVRAM menu item ...
Page 96: ...86 Phaser 840 Color Printer ...
Page 121: ...Service Guide 111 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 ...
Page 125: ...Service Guide 115 Figure 3 Paper path FRUs 0388 16 2 1 5 11 10 9 12 6 4 3 7 13 8 ...
Page 127: ...Service Guide 117 Figure 4 Motors and fans FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 129: ...Service Guide 119 Figure 5 Circuit boards FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 13 12 ...
Page 131: ...Service Guide 121 Figure 6 Solenoids and clutches FRUs 4 5 3 2 1 0388 23 ...
Page 137: ...Service Guide 127 Figure 9 High capacity PaperTray 0388 65a 1 2 ...
Page 142: ...132 Phaser 840 Color Printer ...
Page 154: ...144 Phaser 840 Color Printer ...