Sony Trinitron GDM-C520 Operating Instructions Manual page 47

Calibrating your System—cont.
After you click on the "Start" button, you will see this screen:
The Color Reference Sensor should remain firmly attached to the circle in the center of the screen throughout the calibration
process.
✍
If the sensor should fall from the screen during the calibration process, a dialogue box will appear. Follow the prompts
given by the dialogue box, reattach the sensor to the screen, and restart calibration.
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