____________________________________________________________________
_______________________________________________________________________
MN0090-05 Page 62 of 68 18008
MPT-90 PRODUCT MANUAL
This document contains U.S. export controlled technical data as regulated by the U.S. Export Administration Regulations 15 CFR Parts 730-774, export, disclosure or transfer contrary to U.S. law is prohibited.
6.6.1
Backlash Test
Test and adjust backlash on the Pan or Tilt axis as follows:
1) Stop the unit with the Tilt Table in the horizontal position and remove
power.
2) To test for Pan backlash, grip the Tilt Table and manually try to rotate the
table left and right. Free play should be between 0 and 1/64”.
3) To test for Tilt backlash, grip the Tilt Table and manually try to tilt the
table forward and back. Free play should be between 0 and 1/64”.
4) If free play is excessive in any axis, adjust the backlash.
6.6.2
Backlash Adjustment
CAUTION
BACKLASH ADJUSTMENT MUST ALWAYS BE DONE ON
AN ELECTRONIC STATIC DISCHARGE (ESD) BENCH WITH
ESD TOOLS AND THE TECHNICIAN MUST USE A
GROUNDING STRAP SO AS NOT TO DAMAGE THE CIRCUIT
BOARD.
Backlash adjustment on the Pan or Tilt axis is done as follows:
1) Remove AND KEEP the sixteen (16) cover mounting screws & all
washers
and the Rear Access Covers. Protect the paint from chipping.
2) Remove two screws and tip the Circuit Board outward.
3) Cover the board with an ESD bag so as not to damage the board.
4) Decrease tension on the two (2) Carrier Counter Adjustment Screws.
5) Turn the four (4) Carrier Adjustment Screws clockwise until free play is
within limits.
6) Reapply tension on the two (2) Carrier Counter Adjustment Screws.
7) Adjust Backlash:
To Increase Backlash: Turn the four (4) Carrier Adjustment
Screws counter-clockwise while simultaneously applying tension
to the two (2) Carrier Counter Adjustment Screws.
To Decrease Backlash: Turn the four (4) Carrier Adjustment
Screws slightly counter-clockwise, then turn the two (2) Carrier
Counter Adjustment screws counterclockwise, allowing the worm
in the carrier to get closer to the large helical gear.
Then tighten the four (4) Carrier Adjustment Screws while
checking backlash across the complete diameter of the helical
gear.
8) Repeat this procedure until the free play is within limits.
