Index Adjustment Procedure - Barco F90 Service Manual

11. Colorwheels

11.3 Index adjustment procedure

Procedure
1. Enable the Clean up Wheel slider, and use the arrow keys on the projector keypad to move the slider to the left, step by step, until
a slight disturbance are observed on the screen. This disturbance is identified by horizontal orange /yellow lines on the screen.
This distortion is attempted visualized in figure "Picture distortion".
2. To find the exact point where the distortion starts to be visible, move the slider back and forth around the observed distortion start
point. Find the exact point where the disturbance is visible, and note the value that appears to the right of the Clean Up Wheel
slider.
3. Move the slider to the right, until the distortion in the picture occurs again, typically approximately 15 steps. This is the same type
distortion as described above, but the orange/yellow lines appear to be wider. This is attempted visualized in figure 2. Repeat
the same process for this point, and note the value.
4. Find the average value by adding the two values, and divide by 2 (A+B)/2.
5. Move the Clean Up Wheel slider to the calculated point, and the index are now set to the optimal value.
Image 11-2
Picture distortion
48 723–0016 F90 01/12/2017