HS-105P
Installation
User Manual
3-7
Minimizing Backlash
It is a good idea when the lens drive is fitted (and periodically thereafter) to
adjust the eccentric mounts for minimum backlash. Advance the eccentric
mounts to remove any excess play between the gears. However, do not set the
mounts so close that the lens barrel is tight. Similarly, do not set the mounts so
loose that the lens servo is not repeatable. Find the happy medium. If you
remove the drive from a lens, and then re-mount it on the same lens, no adjust-
ment should be necessary.
Pre-loading The Anti Backlash Gear
Before engaging the zoom and focus anti backlash gears with the lens, preload
the tension as follows: Viewing the gear from the bottom, preload the gear by 3
teeth in the clockwise direction. Hold the preloaded gear to maintain the tension
until it is fully engaged with the lens.
Follow Pot Adjustment
The positional information in the lens servo comes from the zoom and focus
potentiometers. The wiper voltages provide the accurate feedback of position to
the servo. It is important therefore, that the pot wipers move within the center of
the pot’s travel for an end-to-end move of the lens. The method of adjustment is
described below, but note that the resistance values quoted are for reference
only, and may vary slightly from lens to lens. It is more important that the resis-
tance values at each end of travel are symmetrical.
Focus
1.
Switch the lens Manual/Servo lever to Manual.
2.
Loosen the two fixing screws “A” sufficiently to allow the focus pot gear to
rotate free of the lens barrel, if required.
3.
Measure the resistance of the focus pot pin #1 with respect to the wiper.
Rotate the lens barrel to the end of travel in the far focus direction - the
resistance should decrease. Lift the pot anti-backlash gear out of mesh and
rotate the gear for a resistance of 300 ohms. Re-engage the pot with the
lens focus barrel, advancing the ant-backlash gear by 2-3 teeth.
4.
Connect the resistance meter to pin 3 with respect to the wiper. Rotate the
lens barrel to the end of travel in the near focus direction - the resistance
should decrease. Check that the resistance is approximately 300 ohms.
Repeat steps 3 and 4 until the resistance readings at each end of lens travel
are the same.
5.
When symmetry is achieved, check that the anti-backlash gear is set cor-
rectly and tighten the two fixing screws “A”.
Summary of Contents for HS-105P
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