Service Guide
95
Locking the printhead
During normal power-down, the printer tilts the printhead back and energizes
the x-axis drive to move the printhead to the far right. This allows the printhead’s
tilt arm, which moves as the printhead moves, to engage a pin protruding from
the left-side printer frame. This effectively automatically locks the printhead in
place for moving and shipping. The printer will not lock the printhead if any
printer door is open.
Caution
After servicing the printer with power off, never leave the
printhead in the tilted-forward, far-right position. Upon power-
up, the printhead will be tilted backward and the head tilt arm will
crash into the head lock pin. This can damage process gears and
belts driving the tilt arm.
After servicing the printer.
When you service the printhead, x-axis drive, cap/
wipe/purge assembly or other relevant printer components, leave the printhead
in its print position, centered in front of the drum. Upon power-up the printer can
safely move the printhead.
Manually locking the printhead.
If you must manually lock the printhead:
1.
With the printer powered off, carefully tilt the printhead back about
two-thirds of the way by rotating the compound gear.
Do not allow the
spring-loaded printhead to fall forward or it may damage the drum.
2.
Manually rotate the X-axis drive gear, to move the printhead to the
extreme right of its travel. Ensure the lock pin on the left side of the
printer frame properly engages the slot in the head tilt arm.
3.
Rotate the x-axis gear in the opposite direction (about 1 rotation). This
prevents the x-axis drive from binding so tightly that the motor cannot
free it upon power-up.
Reverse these steps to unlock the printhead.
Summary of Contents for Phaser 840
Page 11: ...xii Phaser 840 and 850 Color Printers ...
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 ...