Topcon Total Station IS

Unscrew the cross-hair adjustment section cover, by revolving it in the counterclockwise direction, and take it off.

Loosen all four attachment screws slightly with the accessory screw-drive (while taking note of the number of revolutions).

Revolve the eyepiece section so that the vertical cross-hair coincides to Point A’.

Re-tighten the four screws by the amount that they were loosened.

Check once more and if the point travels the entire length of the vertical cross-hair, further adjustment is not required.

Sign off on the vertical cross-hair adjustment

Warning: This procedure requires trained personnel with PPE!

Rubber caps removed from the top of the instrument?

Hexagonal wrench used to adjust screws A, B, and C?

Laser pointer coincides with the point of intersection?

Screws A, B, and C equally tight?

Rubber caps of the adjustment screws not lost?

Operation keys placed on the telescope eyepiece side?

Sign off on the laser pointer optical axis adjustment

Check whether the optical axis of the laser pointer coincides with the optical axis of the telescope by carrying out the following steps.

1) On the center of a piece of graph paper or white paper, draw a target in the form of a vertical line and an intersecting horizontal line.

2) Set up the target about 10 meters from the IS, and collimate the instrument to the point of intersection of the two lines.

3) Turn on power to the instrument, press the star key mode, and then press the L. P. key, lighting up the laser pointer.

Checking of laser pointer's optical axis 4) With the instrument collimated to the point of intersection of the two lines, check whether the center of the laser pointer is within about 6 mm of the point of intersection.

5) If the center of the laser pointer is within about 6 mm of the point of intersection, there will be no problems with using the instrument.

If the distance is greater than 6 mm, carry out the following steps to align the center of the laser pointer with the point of intersection, and to align the laser pointer's optical axis with that of the telescope.;

Follow the steps below to set the instrument constant value:

Press the [ADJUST] icon from the main menu

The display should return to the previous menu

Adjustment of the level adjustment capstan screw

Bubble returned towards the center of the plate level

Correction of the remaining amount of the bubble displacement

Bubble displacement corrected with the leveling screws

Instrument rotated 180° or 200G around the vertical axis

Repeat of the adjustment if necessary