Printhead-To-Drum Spacing Adjustment (Phaser 840 Printer) - Tektronix PHASER 840 Service Manual

Printhead-to-drum spacing adjustment (Phaser 840 printer)

Tool required
Printhead-to-drum gap tools
9/64 in. hex tip
T-20 TORX tip
This procedure assures that the printhead is the proper distance from the drum.
Make this adjustment after removing or replacing the printhead. The Phaser 850's
printhead mounts are factory calibrated; no printhead-to-drum calibration is needed. If
calibration is ever required, follow the Phaser 840 printhead-to-drum adjustment.
1. Remove the top cover. Remove the metal heat cover.
2.
Tilt the printhead to its print position and, if removed, attach the head
tilt spring.
3. For the "hot" adjustment, scroll to the printer's hidden service support
menu. Activate the diagnostic's Printhead to Drum Gap Adjustment
(Hot) routine. The routine automatically centers the printhead, and
brings the printhead and drum to their operating temperatures.
4.
Lift the ink loader up and back slightly so that the printhead can be
accessed. Do not unplug the printhead.
5. If not already tightened, tighten the printhead mounting screws to
20 in- lbs.
6.
If not already loose, loosen the printhead's four locking screws (two at
each end of the printhead) until they are just snug in place.
102
Phaser 840 and 850 Color Printers
Small (3/16 in.) flat-blade screwdriver
Magnetic screwdriver