15
13912-101 Rev. B
Note: If the Travel Lock has not been disengaged, perform the steps in the Disengage
Travel Lock, paragraph in the Instrument Setup section of this manual.
When power is applied to the AT555, it will initially perform a calibration check. After
completion of the calibration, the message “Press any button to continue” will be displayed.
After this message is displayed, press any Control Button on the operator side and the
instrument will be ready for use.
After you press any button, the Operator Display will display a message to move the Forehead
Rest fully to the left or right until it locks into position if it is not already in this position.
Instructions for Use
Alignment & Measurement
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