![Operation](/images/new-backgrounds/152906/15290611x1.webp)
Operation
4 Operation
Sensitize
Desensitize
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Switch the sensitise/desensitise switch to the required operating mode.
Slide the book through the Model 955 as illustrated adjacent.
The light beam from the optical sensor will be interrupted.
An audible sensitise/desensitise pulse will be triggered.
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