Videotec PTH900 User Manual

Page 23

Pag. 5 PTH910 / PTH911 3201

Adjustment of the potentiometer for PTH910P / PTH911P preset pan & tilt motor

This operation is very important for the correct working of the preset.

PTH910P/PTH911P Pan & Tilt motors are still set in our works, therefore this procedure is to be made only in case of
real necessity.
The following procedure has to be followed both for the potentiometer connected with the horizontal movement and for
the one connected with the vertical movement.

1. Disconnect the pan & tilt motor supply
2. Adjust the cams by means of a screwdriver until their

position is symmetric compared to the end of stroke

3. Loosen the fixing screw “A” of the potentiometer holder

bar

4. Release the pinion from the gear
5. Place an Ohmmeter between the Vcc and Pan clamps of

the terminal strip J4 and turn the potentiometer shaft,
which is connected to the Horizontal movement, till
reading the value of about 1875 Ohm.

6. Replace the potentiometer gear
7. Lock the fixing screws “A” of the potentiometer holder bar
8. Repeat the same operation for the vertical movement till

reading the value between Vcc and Tilt clamps of the
terminal strip J4.