HTS-420R Maintenance Manual
22
(2) Replace the laser and test again to find out if the laser is weak
9. Inaccurate slope distance result
(1) Reset the Add constant
(2) Reset the Mul constant
(3) Check if the laser is blocked by light shutter of motors
10. Accurate slope distance result but inaccurate horizontal distance result
(1) Calibrate the Index error correctly
(2) Clean the code disc
(3) Calibrate the compensator
(4) Align the laser beam
(5) Replace the tribrach to check if it is faulty
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