HTS-420R Maintenance Manual
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4) Face 2: do the same thing as done on Face 1, and finally press 【Ok】and restart the instrument to save
the parameter.
6. Compensator zero position alignment
1) Fix the instrument on a stable and solid platform then level it. Take out the right cover and put in the
battery then hang the cover to keep the battery connected.
2) Choose “Tools”->”Adjust”->’’Adjust Tilt X”. Loosen the right screw according to the offset value ( the
larger the value is, the looser the screw should be, and sometimes the left screw should also be loosened).
Tap the right side of compensator up or down to adjust the value to be as close to 0 as possible. Note the
value as A when it gets steady. Turn the instrument horizontally by about 180° and note the value again as
B, then calculate the offset =A+B. Check if the sum of A+B is within the qualified range of -30 to 30. If it is
not, continue tapping the compensator until the sum of A+B is qualified. Finally, tighten the screw and
install the cover. Do the same thing for calibration of Y compensator which is behind the display unit(Face
2).
7. Compensator linearity calibration (calibration by software)
This calibration should be based on qualified compensator zero position, otherwise the calibration may fail.
Before linearity calibration, calibrate the Index error first to give this calibration the correct reference data.
X compensator:
1) Place the instrument on a solid and stable platform and set one leveling screw to the target crosshair
direction. Fix the instrument and level it, in the meantime, make sure the sight line from the eyepiece to
the target crosshair is approximately horizontal, then take the steps below.
2) Turn the instrument to Face 1, choose “Tools”->”Adjust”->’’Adjust Tilt X”, as shown in the picture below.
Aim at the target cross and make both crosshairs coincide, then tighten the clamps. After that, adjust the
front leveling screw to tilt the instrument up by 3′ (by 1 grid= 20”, the horizontal line of the telescope
crosshair will go up 9 grids from the target horizontal line in this process).
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