Topcon GPT-2005 Manuel D’Utilisation

   17 CHECK AND ADJUSTMENT

17-4

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1) Adjust the eyepiece of the telescope properly prior to any checking operation which involves 

sighting through the telescope.
Remember to focus properly, with parallax completely eliminated.

2) Carry out the adjustments in the order of item numbers, as the adjustments are dependent one 

upon another.  Adjustments carried out in the wrong sequence may even nullify previous  
adjustment.

3) Always conclude adjustments by tightening the adjustment screws securely (but do not tighten them 

more than necessary, as you may strip the threads, twist off the screw or place undue stress on the 
parts).
Furthermore, always tighten by revolving in the direction of tightening tension.

4) The attachment screws must also be tightened sufficiently, upon completion of adjustments.
5) Always repeat checking operations after adjustments are made, in order to confirm results.

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Note that the angle measuring precision may be effected directly if the tribrach has not been installed 
firmly.
1) If any leveling screw becomes loose and slack or if collimation is unstable due to the looseness of 

leveling screws, adjust by tightening the adjusting screws (in 2 places) installed over each leveling 
screw with a screwdriver

2) If there is any slack between the leveling screws and the base, loosen the set screw of the holding 

ring and tighten the holding ring with adjusting pin, until it is properly adjusted. Re-tighten the set 
screw on completing the adjustment.

Adjustment  screw

Leveling screw

Holding ring

Set screw

Adjustment  screw