Troubleshooting guide

63
Calibration For Earlier Style Mechanical Gearmotor/Potentiometers
and 1100 millivolts. Without changing the gear
mesh, remove one ¼” screw, and apply Loctite
#242 to the threads. Reinstall the screw finger
tight, then repeat the procedure on the remain-
ing screw (do not change the orientation of the
lockwashers on the screws). The gear lash must
be adjusted so there is no side load on the po-
tentiometer shaft. Tighten and torque the ¼”
socket head cap screw to 16 ft/lbs. Recheck
the millivolt reading. It must be between 900
and 1100 millivolts. If not, the gear mesh will
have to be readjusted.
At this point, press the Set Min button in the
Volume Slide Valve Potentiometer window.
Realize that the Current Vol window will show
a value, but it has no meaning at this point.
Now turn the command shaft to the fully
loaded position. With the slide valve against
the mechanical stop, release the tensions in
the mechanism by actuating the brake and
manually turn the command shaft back one
tooth on the command shaft gear. This is the
maximum millivolt position. Now press the
Set Max button. Calibration of the slide is
completed AFTER pressing the Main button,
to exit the Slide Calibration Screen. Now if
you re-enter the Slide Calibration Screen, the
correct value will be displayed in the Current
Vol window and on the Main screen.
Upgrading from Old Style Gear
Motors to Optical Actuators.
Refer to the installation instructions that are
supplied with the new Optical Actuators.
(VPN 25972A)