Riken Keiki TP-70DGII, Руководство по эксплуатации

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3. Product Components 3-3. Names and functions for each part
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<Detaching and Attaching Sensor Unit>

Loosen the knurled screw that fixes the front cover of the main unit and open the cover.

Push the two buttons at the top of the display unit together to open the
front cover. (Pushing only either one button cannot open the cover, but
then pushing the other can open it.)

Hold the convexed parts on both sides of the sensor unit and pull it out.
If the sensor unit is hard to detach, insert a finger into the gap at the top
right of the sensor unit and pull it out.

When attaching the sensor unit to the main unit, thrust it onto the main
unit and make sure that the sensor unit is securely fixed, otherwise it
might come off.

After replacing the sensor unit, close the front cover of the display unit.
Be sure to check the click of the front cover to fix it properly, otherwise it
might open again.

Close the front cover of the main unit and tighten the knurled screw.
Knurled screw
Top view
CAUTION
Turn the power off before detaching or attaching the
sensor unit.