STARLITE Mk5 User Manual Version 1.2
49
To adjust Pan Sensor (cont.)
1. Loosen off the two retaining screws holding the Pan Sensor Unit. The unit should be loose enough
to allow the sensor gear to become un-meshed from the ring gear.
2. Manually turn the sensor gear fully CCW till it reaches the end stop of the pot.
(Do this with care, so that the pot is not damaged)
3. Manually turn the units head fully CCW until the end stop is engaged.
(Ensure that the sensor unit out of the way and is not altered whilst doing this).
4. While holding the coupling on the sensor unit, to maintain the pot in it’s fully CCW position,
reposition the sensor unit, with the sensor gear correctly meshed into the ring gear.
5. Tighten up the two retaining screws ensuring that the sensor gear is only meshed with the main
ring gear and not the ring gear and main drive gear. If the plate is moved to far over so that these
gears mesh, the drive will be locked and damage may occur. The sensor gear should be meshed
with a small amount of backlash to the main ring gear. This is to ensure that the minimum of side
load is applied to the potentiometer assembly.
6. Power up the lamp and send the Pan to its full (CW) position, mid-position (50%) and check for
position and full travel. Check that the motor does not drive against the clutch at either end of its
travel. If this needs adjusting refer to the section on ‘Adjusting the Decoder Card reference
voltage’.
Adjusting the Pan position sensor(Current models)
This should not require adjustment during normal use. If adjustment is required, first unplug the unit
and remove the cover over the main pan ring drive gear to expose the pan drive gear and position
sensor located on the “input connector” side of the base.
Cross-sectional view of pan sensor
Pan sensor Coupling
Right angle
gearbox
Main pan drive
shaft
Pan position
gear
Main pan
drive gear
Pan Ring
Gear
Pan ring
gear
journal
Pan sensor mounted
on spring-damped
arm.
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