Hi-Target HTS-420R User manual

HTS-420R Maintenance Manual
HTS-420R Total Station
User Service Manual
2 0 1 9
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HTS-420R Maintenance Manual
Manual Revision
HTS-420R Total Station
Revision Date
Revision No.
Description
Mar. 2019
1
HTS-420R Total Station Service Manual

HTS-420R Maintenance Manual
HTS-420R
Total Station

HTS-420R Maintenance Manual
Contents
Disassembly of Main Parts ............................................................................................................................. 1
Handle Unit ............................................................................................................................................ 2
Display Unit (Face 2)............................................................................................................................... 2
EDM board ............................................................................................................................................. 2
Mainboard ............................................................................................................................................. 4
Electric Brush ......................................................................................................................................... 4
EDM Module .......................................................................................................................................... 5
Long Vial ................................................................................................................................................ 5
Horizontal Tangent Screw Unit ............................................................................................................... 6
Vertical Tangent Screw Unit.................................................................................................................... 6
Eyepiece ................................................................................................................................................. 7
Common maintenance items ......................................................................................................................... 8
List of Common Maintenance Items....................................................................................................... 9
Maintenance Operations........................................................................................................................ 9
1. Long vial calibration.................................................................................................................... 9
2. Circular vial alignment.............................................................................................................. 10
3. Telescope reticle alignment ...................................................................................................... 10
4. Collimation Error Calibration (2C Calibration) .......................................................................... 11
5. Index Error Calibration (2I Calibration)..................................................................................... 12
6. Compensator zero position alignment ..................................................................................... 13
7. Compensator linearity calibration (calibration by software) .................................................... 13
8. Laser plummet alignment......................................................................................................... 14
9. EDM laser beam alignment ...................................................................................................... 15
10. EDM Laser Replacement......................................................................................................... 16
11. Filter Motor Replacement ...................................................................................................... 16
12. Prism/No Prism Switch Motor Replacement .......................................................................... 17

HTS-420R Maintenance Manual
13. Light Path Switch Motor Replacement ................................................................................... 17
Troubleshooting ........................................................................................................................................... 18
Fault Analysis........................................................................................................................................ 19
Fault Clearance..................................................................................................................................... 20
1. Fail to turn on ........................................................................................................................... 20
2. Automatic shutdown after turning on ...................................................................................... 21
3. Program crash .......................................................................................................................... 21
4. Tilt over even when the instrument is level ............................................................................. 21
5. Blank screen, black screen or buttons don’t work .................................................................... 21
6. Fail to communicate with PC .................................................................................................... 21
7. Don’t measure distance at all ................................................................................................... 21
8. Only measure short distance .................................................................................................... 21
9. Inaccurate slope distance result ............................................................................................... 22
10. Accurate slope distance result but inaccurate horizontal distance result ............................... 22

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Chapter 1
Disassembly of Main Parts
This Section Describes
- Handle unit
- Display unit (face 2)
- EDM board
- Mainboard
- Electric brush
- EDM module
- Long level vial
- Horizontal tangent screw unit
- Vertical tangent screw unit
- Eyepiece

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Handle Unit
1. Unscrew the two bolts with hand then take out the handle unit.
Display Unit (Face 2)
1. Unscrew the 4 screws then open the screen unit and turn it over.
2. Take off both compensator cables and LCD flat cable then take the display unit out.
EDM board
1. Unscrew the 4 screws and remove the top telescope cover. Refer to figure 2-4.
2. Take off all the cables and the 3 screws on the board. Refer to figure 2-5.
3. Turn over the EDM board then unscrew the fixing screw of the optical fiber cable and take the cable out.
Refer to figure 2-6.
Compensator cables
LCD cable
Figure 2-2 display screws
Figure 2-3 display cables

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Figure 2-6 optical fiber cable
EDM board
Figure 2-4 telescope cover screws
Figure 2-5 EDM board,cables and screws

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Mainboard
1. Unscrew the 6 screws on the right cover and take the cover out.
2. Take off all the cables and unscrew the 4 screws then take the mainboard out.
Electric Brush
Figure 2-9 Mainboard Figure 2-10 electric brush and fixing screws
Mainboard
Figure 2-7 right cover screws
Figure 2-8 main board , cables and screws

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1. After taking out the mainboard, remove the 3 fixing screws.
2. Take off the connector from the EDM board side then pull the Electric brush out from the mainboard
side.
EDM Module
Figure 2-11 telescope cover screws Figure 2-12 EDM module and fixing screws
1. Unscrew the 4 cover screws to take the cover out.
2. Take off all the cables on the EMD board then use the Hex screw driver (3.0mm) to unscrew the 3 fixing
screws on the EDM module board and take the whole module unit out.
Long Vial
Figure 2-13 long vial and screws

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Loosen the 2 screws and take long vial out.
Horizontal Tangent Screw Unit
Figure 2-14 fixing screws
Open the display unit (face 2), then unscrew the 2 screws and take the whole tangent screw unit out.
Vertical Tangent Screw Unit
After taking out the cover, do the same thing as done for Horizontal tangent screw unit.
Figure 2-15 fixing screws

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Eyepiece
1. Unscrew and take out the protective cover.
2. Unscrew the 3 screws and take out the eyepiece.
Figure 2-16 eyepiece, protective cover, screws

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Chapter 2
Common maintenance items
This Section Describes
- List of common maintenance items
- Maintenance operations
- Troubleshooting

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List of Common Maintenance Items
1
Long level vial calibration
2
circular level vial calibration
3
Telescope reticle calibration
4
Collimation error calibration(2C calibration)
5
Index error calibration(2I calibration)
6
Compensator mechanical zero position alignment
7
Compensating linearity calibration of compensator
8
Laser plummet alignment
9
EDM laser replacement
10
EDM laser beam alignment
11
filter motor replacement
12
Prism/No Prism mode switch motor
13
light path switch motor replacement
Maintenance Operations
1. Long vial calibration
1) Fix the instrument on a solid and stable platform and set the vial to the position between leveling screw
A and B, then continue the steps below.
2) Adjust the screw A and B to center the bubble. Turn the instrument horizontally by about 90°and then
adjust screw C to center the bubble. Turn the instrument 180°to check if the bubble is still staying in the
center. If it is, the vial is aligned, otherwise take the next step.
3) Use the adjusting pin to twist the screw beside the vial to make the bubble move half distance toward
the center.
4) Repeat the step 2 and 3 until the bubble is in the center in every direction.

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AB
C
AB
C
2. Circular vial alignment
1) Fix the instrument on a solid and stable platform. After leveling the instrument, check if the circular level
vial is within the center circle. If it isn’t, continue the following steps to align it.
2) Loosen or tighten the screw on the opposite side of the bubble to push the bubble to be as close to the
center circle as possible.
3) Do the same thing on the other screw.
4) Repeat the steps 1 and 2 until the bubble is within the center circle.
A B
3. Telescope reticle alignment
1) Fix the instrument on the solid and stable platform and then level it. Adjust the telescope to connect the
top/bottom endpoints of the vertical lines of telescope, target crosshair then check if there is offset
between two vertical lines. If there is, continue the following steps to align the reticle.
2) Unscrew and take out the protective cover.
3) Loosen the 3 screws on the spacer slightly and twist the plate to make both crosshairs coincide.
4) Tighten the screws and install the cover.
Step 2
Step 3

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4. Collimation Error Calibration (2C Calibration)
1) Fix the instrument on a solid and stable platform. After leveling it, continue the following steps.
2) Face 1: Aim at target crosshair and make both crosshairs coincide. Set horizontal angle to 00°00′00″ (for
easier calculation) and turn instrument to the Face 2.
3) Face 2: Do the same thing as done on the Face 1 except setting 0. Note the horizontal angle HR and
calculate the 2C: 2C = HR (Face 2) –HR (Face 1) - 180°= HR (Face 2)-00°00’00”-180°=HR (Face 2)-180°then
check if the 2C is within the qualified range of -16 to 16. If it is not, take the following steps to calibrate the
2C.
4) If 2C<-16, loosen the screw of the right side then tighten the screw on the left side to draw the vertical
line of the telescope crosshair toward the left side , in the meantime, observe the movement of the vertical
line of the telescope crosshair until the vertical line is in the correct position. E.g. if 2C=179°59’10”-180°=
-50”, loosen the screw of the right side then tighten the screw of left side to draw the vertical line toward
the left side by |-50|”/2=25’’(namely 1.25 grid by 1grid=20’’), as shown in the picture below.
5) If 2C>16, loosen the screw of the left side and tighten the one on the right side. E.g. If 2C=180°00’
20’’-180°=20”, loosen the screw of the left side then tighten the other one to draw the vertical line toward
the right side by 20”/2=10”.(the alignment the is based on face 2)
Spacer

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5. Index Error Calibration (2I Calibration)
1) Fix the instrument on a solid and stable platform then level it. In the meantime, make sure the sight line
from the eyepiece to the target crosshair is approximately horizontal.
2) Turn the instrument to Face 1, aim at the target crosshair and make both crosshair coincide. Note the HR
(Face 1) and turn the instrument to Face 2. Do the same thing as done on Face1 and note HR (Face 2).
Calculate the 2I= 360°- HR (Face 2)-HR(Face 1). If the 2I is outside of the qualified range of -16 to 16, take
the steps below to calibrate the 2I.
3) Face 1: press the button to enter the bubble chart interface to turn off the compensator, as shown
in the first picture. Choose “Tools”->”Adjust”->”Adjust Index Error”, as shown in the second picture below.
Aim at the target crosshair and make both crosshairs coincide then press 【ok】, the screen will display the
message “Take reverse”, then turn the instrument to Face 2.

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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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3) Adjust the tangent screws to make both crosshairs coincide again and then press【Ok】. When the screen
display the massage ‘’F1 down 3’”, adjust the leveling screw to tilt the instrument down by 6’from the
target horizontal line (the compensator axis is actually tilted down 3’from the horizontal plane).
4) Adjust the tangent screw to make both crosshairs coincide again then press 【Ok】. The screen will
display message’’F2 up 3’”.
5) Adjust the leveling screw to Tilt the instrument up 3’(9 grids by 1 grid=20”) to level the instrument again
and then turn it to Face 2. Do the same thing as done on Face 1. Finally, check if the value of Cok and Coz is
respectively within the qualified range of -1< Cok <1 and -30<Coz<30.
6) When both values are qualified, note the electronic bubble offset X(Face 1) and turn 180°to get X(Face 2)
then calculate X(Face 1)+X(Face 2). If the result of X (Face 1) + X (Face 2) is within -30 to 30, the calibration
is successful, otherwise repeat the calibration.
Y compensator:
Do the same thing as done on X compensator, but every time before pressing 【Ok】, turn the instrument
anticlockwise by 90°.
8. Laser plummet alignment
1) Remove the plummet cover at the bottom of the pedestal. Set up the tripod and mount the instrument
on, and then level it. Turn on the laser and place a paper reticle where the laser spot is. Rotate the
instrument and check if the laser spot is drawing circle. If it is, continue the following steps to align the
plummet.
2) Place the cross point of the reticle to the center of the laser spot track. Slightly loosen the plummet
screw of the laser spot side and tighten the one on the opposite side to push the laser spot as close to the
center as possible. Check the offset of the laser spot again, then tighten or loosen the third screw to center
the laser spot.
3) Repeat adjusting paper retical and screws until the laser spot is cast right on the center of the cross.
Tilting process of X compensator

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9. EDM laser beam alignment
Setup the instrument and set a crosshair over 30 m away from it. Level the instrument and adjust the
telescope to make both crosshair coincide. Turn on the EDM laser to check if the laser spot is cast right on
the center of target crosshair. If it is not, open the top telescope and continue the following steps to align
the laser beam.
Up - down adjustment:
As shown in the picture below, twist the screw 1 anticlockwise to push the laser spot up, or twist it
clockwise to push the laser spot down, until the laser is right on the horizontal line.
Left - right adjustment:
Twist the screw 2 anticlockwise to push the laser spot to the left, or twist it clockwise to push the laser
spot to the right, until the laser is spot right in the center.
A
B
C