Y-Axis Belts Tension Adjustment - Tektronix Phaser 380 Service Manual

9
Checks and Adjustments

Y-axis belts tension adjustment

9-8 Phaser 380 Color Printer
Perform this procedure after loosening or removing the y-axis belt drive
assembly.
1. Turn off the printer. Remove the right-side panel as described in the
topic "Cabinet panels and covers" on page 8-4.
2. Ensure the correct shims are installed under the drive assembly's
bracket at each mounting screw. Screw a = 0, b = 0.18 mm (0.007 in.),
c = 0.5 mm(0.020 in.) and d = 0.30 mm(0.012 in.). (Later drive brackets
will not use shims but instead will feature bosses of the required
height.)
3. Ensure that the four screws that secure the Y-axis drive assembly are
1/2 turn loose. The assembly's bracket should be loose and slide
freely against the chassis.
4.
Attach the Y-axis belt tension tool (in its unloaded or folded out
position) to the keyholes in the side frame of the printer just below
and in front of the Y-axis drive assembly. The tool's fishhook should
engage the eyelet on the underside of the Y-axis drive assembly.
5. Pull forward and down on the lever arm of the tension tool to apply
tension to the Y-axis belts.
6.
Connect a PC to the printer and start diagnostics as described in the
topic "Starting the diagnostics" on page 6-25. Turn on the printer and
start service diagnostics on the connected PC.
7. On the PC, scroll and activate the test menu item Y-Axis – Rotate
Y-axis at Medium for 5 to 10 seconds to seat the drive belts in place.
Exit the test by selecting Y-Axis – Stop Y-Axis.
8.
Rotate the drive clock-wise (as viewed from the right side of the
printer) until the drum ring gear's minimum radius mark is inline
with the centerline of the drum and the Y-axis pulley and also at its
farthest position from the idler pulley, and the access hole in the idler
pulley allows access to mounting screw (b).
9. Tighten the four mounting screws to 33 kgs/cm (30 in./lbs.) in the
order (b), (c), (d) and then (a) to secure the Y-axis drive assembly in
place.
10. Release the tension tool's lever arm and remove the tool.
11. Reassemble the printer and make a test print.