44
Phaser 840 Color Printer
5.
Check that the pick roller is being rotated. In its starting position, the
pick roller’s flat side should face down; the flat, keyed end on the left
end of the pick roller shaft faces up. If it is not, go to the topic
“Checking the process motor and drive train” on page 45. Otherwise,
go to Step 6.
6.
Clean the pick roller with alcohol and a lint-free cloth. Paper dust can
coat the pick roller and affect its ability to grip the paper and pull it out
of the tray. Also clean the transport rollers.
7.
Use the PC-based diagnostic’s Verify Drive Current Requirement Test
to check the operation of the paper-pick system.
8.
Inspect the wiring harness leading to the paper transport clutch for
nicks, cuts or crimped wiring. Ensure the connector is seated.
9.
Inspect the paper-feed module for obstructions.
Print transfer jams
1.
Using PC-diagnostics, test the paper preheater. If the test fails,
replace the paper/drum heater assembly.
2.
Check to see if the upper feed roller drive belt is broken or slipped off of
its pulleys. In such a case, the upper feed roller does not rotate when
the lower feed roller rotates.
3.
Check that the feed rollers rotate smoothly and that the front cover is
fully closed and seated.
4.
Check the paper-eject path for obstructions. Ensure no small pieces of
paper are trapped around the stripper fingers.
If a piece of paper is trapped in the paper pre-heater, try pushing it out
by inserting a stiff piece of cardstock into the paper preheater.
5.
Ensure that the transfix roller rotates during the transfix process.
6.
Test the sensors in the paper path. Look for damaged or non-operating
sensor flags.
7.
Check the transfix solenoid and its cam. Ensure they operate correctly
and are properly lubricated.
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 ...