Topcon GPT-2005 Manuel D’Utilisation

   17 CHECK AND ADJUSTMENT

17-9

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1) Turn on the laser plummet and coincide the center of the laser with a measuring point.
2) Rotate the instrument 180°  or 200g around the vertical axis and check the measuring point.

If the laser is properly centered in the measuring point, adjustment is not required. Otherwise, 
adjust in the following manner.

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1) Turn the cap located on the left side corner of the 

instrument counterclockwise and remove it.
This will expose four adjustment screws which 
should be adjusted with the accessory hexagonal 
wrench.

2) Shift the laser to the measuring point. However, 

correct only one-half of the displacement in this 
manner.

3) Use the leveling screws and coincide the center of the laser and the point.
4) Rotate the instrument 180°  or 200g around the vertical axis once more and check the point and the 

laser. If the laser is coincided to the measuring point, then further adjustment is not required. 
Otherwise, repeat the adjustment.

The laser can be moved by turning the adjustment screws clockwise as follows.

Cap

Adjustment screws

Adjustment
 screws

Half amount

  of

displacement

Measuring point

Laser

Totla amount

 of

displacement

Note:

Note:First, loosen the adjustment screw to move the laser. Then tighten the adjustment screw on 
the opposite side by an equal amount which will leave the tension of the adjustment screws 
unchanged.
Revolve in the counterclockwise direction to loosen and in the clockwise direction to tighten, but 
revolve as little as possible.

Laser beam

Laser is moved down.

Laser is moved right.

Laser is moved left.

Laser is moved up.