Gerber HS15 Plus User Manual page 65

5. Locate the theta motor (23) on the far right closest to the top of the
plotter. Find the pinion gear at the center of the motor, which
meshes with the drive gear (17) on the rear way shaft (3). Now
locate the opto-sensing disk next to the drive gear (17). It is a flat
black disk about 1" in diameter.
6. Check to be sure that the disk is clean and centered between the
opto-sensors.
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If the disk is off-center, you must center the disk. To do so,
loosen the Allen set screw on the silver clamp next to the
disk. This allows the disk to be slid forward or backward.
When the disk is centered, tighten the Allen set screw.
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If the disk is dirty, shut off the plotter and the system. Clean
the disk with isopropyl alcohol using a lint free cloth or a
pipe cleaner, making sure all sides of the disk and opto-
sensors are clean.
7. Turn the rear way shaft (3) by hand until the slot in the disk faces
straight up.
8. Turn the machine on and watch the disk. It should rotate and stop
between the opto-sensors (located under 65). If this does not occur,
call Gerber Field Service. Otherwise, continue with the next step.
9. If the disk is clean and centered and homed correctly, loosen the
Allen set screw (47) but DO NOT MOVE THE DISK.
10. Turn the rear way shaft (3) until the locking pin (inside 30) is moved
to the 12:00 position.
11. Tighten the screw, being careful any of the parts.
12. To test, turn off the plotter and rotate the rear way shaft (3) a 1/4
turn. Turn on the machine. The pin should home to 12:00.
13. Repeat the above procedures if you were unsuccessful.
Plotter Adjustments 57