e-survey ET2A Operating manual

ET2A
Electronic Digital Theodolite
MAINTENANCE GUIDE

Shanghai eSurvey GNSS Co., Ltd.

SHANGHAI ESURVEY GNSS CO., LTD.
Copyright © Shanghai eSurvey GNSS Co., Ltd. 2022. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means
without prior written consent of Shanghai eSurvey GNSS Co., Ltd.
Trademarks and Permissions
and other eSurveytrademarks are trademarks of Shanghai eSurvey GNSS Co.,
Ltd.
All other trademarks and trade names mentioned in this document are the property of their
respective holders.
Notice
The purchased products, services and features are stipulated by the contract made between
eSurvey and the customer. All or part of the products, services and features described in
this document may not be within the purchase scope or the usage scope.
The information in this document is subject to change without notice. Every effort has been
made in the preparation of this document to ensure accuracy of the contents, but all
statements, information, and recommendations in this document do not constitute a
warranty of any kind, express or implied.
Certificate This product has been tested and found to comply with European Council
Directive 2014/30/EU, thereby satisfying the requirements for CE Marking and
sale within the European Economic Area (EEA). These requirements are
designed to provide reasonable protection against harmful interference when the device is
operated in a residential or commercial environment.

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Contents
1Before You Start .........................................................................................................1
1.1 Precautions for Safe Operation..........................................................................1
1.1.1 Caution...........................................................................................................2
1.1.2Warning..........................................................................................................3
1.1.3Danger............................................................................................................3
1.2 Disclaimer..............................................................................................................3
2ET2A at a Glance ........................................................................................................4
2.1 Important Parts......................................................................................................4
2.2 Operation Panel.....................................................................................................5
3Disassembling ............................................................................................................6
3.1 Disassemble the Left Cover ..................................................................................6
3.2 Disassemble the Mainboard..................................................................................8
3.3 Disassemble the Vertical Circle.............................................................................9
3.4 Disassemble the Right Cover..............................................................................10
3.5 Disassemble the Vertical Tangent Screw............................................................12
3.6 Disassemble the Display .....................................................................................13
3.7 Disassemble the LCD Module.............................................................................13
3.8 Disassemble the Plate Level ...............................................................................14
3.9 Disassemble the Horizontal Tangent Screw........................................................15
4Assembling ...............................................................................................................15
5Check and Adjustment.............................................................................................16
5.1 Check and Adjust the Plate Level........................................................................16
5.2 Check and Adjust the Circular Level....................................................................16
5.3 Check and Adjust the Optical Sight.....................................................................17
5.4 Check and Adjust the Laser Plummet .................................................................17
5.5 Check and Adjust the Vertical Line of the Reticle................................................18
5.6 Check and Adjust the Line-of-Sight Error or Collimation Error ............................19
5.7 Check and Adjust the Vertical Index Error...........................................................20
5.8 Check and Adjust the Linearity of the Compensator............................................21
5.9 Check and Adjust the Coinciding of the Laser Spot and Target Center...............23
6Troubleshooting .......................................................................................................24
6.1 Failed to Power on the Instrument.......................................................................24
6.2 The Instrument Automatically Powered Off .........................................................24
6.3 Unstable Horizontal Angle...................................................................................25
6.4 Unstable Vertical Angle .......................................................................................25
6.5 Character TILT Shows.........................................................................................26
6.6 Serious Error in the Horizontal Angle ..................................................................26

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6.7 Serious Error in the Vertical Angle.......................................................................27
6.8 The Horizontal Tangent Screw is Broken ............................................................28
6.9 The Vertical Tangent Screw is Broken ................................................................28
6.10 Display Error........................................................................................................28

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1 Before You Start
Before you start, please carefully read this part.
1.1 Precautions for Safe Operation
Precautions in this part are intended to minimize the risk of personal injury and/or damage
to property, and all indicate ATTENTION! BECOME ALERT! YOUR SAFETY IS
INVOLVED!
Precautions can be divided into the following types according to the degree of loss or injury
in case of negligence or omission:
Indicates important paragraphs that must be adhered to in practice asthey
enable the product to be used in a technicallycorrect and efficient manner.
Indicates a potentially hazardous situation that, if not avoided, may result
in INJURY OR PROPORTY DAMAGE OR IRRETRIEVABLE DATA
LOSS.
Indicates a potentially hazardous situation that, if not avoided, could result
in SERIOUS INJURY OR EVEN DEATH.
Indicates an imminently hazardous situation that, if not avoided, will result
in VERY SERIOUS INJURY OR EVEN DEATH.

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1.1.1 Caution
The following outlines the cautions that you must avoid when operating the ET2A:
For optimum usage, please regularly check and adjust the instrument (at
least every three-month) especially after storage for a long time and
transportation.
Please make sure there is no leaves or obstacles between the target and
the instrument for good measuring result.
Please set up the instrument on the tripod, and make sure the connection
between the tripod and instrument is firm.
When transporting, please keep the instrument in the case provided and
try your best to minimize vibration of the instrument.
Please do not store the instrument in high temperatures or set it up under
strong sunlight to present the photosensor from heating up as it may affect
the accuracy of the instrument.
Please avoid direct sunlight from passing through the objective and
eyepiece which may cause interference.
Please do not touch the lens with your fingers. And please clean the
surface, buttons, screen and outer layer of the instrument with a soft cloth,
and clean the optical parts only with lens paper.
Please store the instrument and battery in a dry and cool place with proper
temperature.
When carrying the instrument, please tightly hold the handle.
Please do not take out the battery when the instrument is on, and please
replace the battery after powering off the instrument. Otherwise, the stored
data may be lost.
Please do not touch the instrument with wet hand. Otherwise, electric
shock may occur.
Please do not arbitrarily stand or seat on the carrying case, or turn over it.
Otherwise, the instrument may be damaged.
Please be careful of the tripod tiptoe when setting up or moving it.
Once your work is completed, please clean the instrument, and keep it
back into the case.
Please do not drop the instrument or the carrying case, or use defective
belt, agraffe or hinge. Otherwise, the instrument may be damaged.
Please do not touch liquid leaking from the instrument or battery.
Otherwise, harmful chemicals could cause burn or blisters.

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1.1.2Warning
The following outlines the warnings that you must avoid when operating the ET2A:
This instrument is only for qualified surveyor or professional users who
have a good knowledge of surveying.
To avoid permanent eye damage, please do not point the laser beam at
other’s eyes, do not directly look into the laser beam source, do not stare
at the laser beam, and do not look at the laser beam through a telescope
or other optical devices.
Please do not collimate the sun directly. Otherwise, eye injury or blindness
and objective damage may occur.
Please do not cover the charger when charging. Otherwise, fire may occur.
Please do not use wet battery or charger, defective power cable, socket or
plug, and power cable and battery not specified by eSurvey. Otherwise,
fire or electric shock may occur.
Please do not put the instrument close to burning gas or liquid and the
battery in the fire or high temperature condition, and do not use the
instrument in coal mine. Otherwise explosion may occur.
Please avoid short circuit of the battery. Otherwise, fire may occur.
Please avoid disturbance of severe electrostatic discharge. Otherwise,
degraded performances of the instrument may occur, like switching on/off
automatically, etc.
1.1.3Danger
The following outlines the danger that you must avoid when operating the ET2A:
Only eSurvey authorized distributors can disassemble or rebuild the
instrument.
If you need to replace important parts, please do not replace the parts of
other brands without permission.
1.2 Disclaimer
You are expected to follow all operating instructions and regularly check the performance of
this instrument. It is your responsibility to exercise common sense while using the ET2A,
and keep it operating safely.
We assume no responsibility for any damage and loss of profits in the following conditions:
A faulty or intentional usage or misuse.
Any disasters, such as earthquakes, storms, floods etc.
A change of data, loss of data, an interruption of business etc.
Wrong transport.
Use of non-original parts.
Usage not explained in the user guide.

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2 ET2A at a Glance
2.1 Important Parts
The important parts of ET2A is as follows:

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2.2 Operation Panel
The operation panel is as follows:
Keyboard
Keys
Meaning
0SET
Set the horizontal angle to 0.
R/L
Set the horizontal angle right or left.
HOLD
Hold the horizontal angle.
V/%
Set the display unit of the vertical angle (°or %) by pressing 1 second
and turn on or off the laser pointer by pressing 3 seconds.
Turn on or off the light by pressing 3 seconds.
Power on or off the instrument by pressing 3 seconds and turn on or off
the laser plummet by pressing 1 second after powering on the
instrument.
+ R/L
Configure the instrument.
+ HOLD
Measure the same horizontal angle several times.
Display
Characters
Meaning
22-01-11
The current date (year-month-day).
13:33
The current time.
The instrument will automatically power off within 30 minutes if no action
is carried out.
VA
The vertical angle.
HAL
The horizontal angle left.
HAR
The horizontal angle right.
The battery level.
The compensator is ON.
Measure the same horizontal angle several times.
Hold the horizontal angle.
Change the function.

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3 Disassembling
When disassembling the instrument, please carefully protect each part. It
is forbidden to disassembling parts not mentioned here.
3.1 Disassemble the Left Cover
To disassemble the left cover, do the following:
1. Remove four cross recessed pan head screws (M2.5X10) screws and one cross
recessed pan head screw (M2.5X20) that fix the left cover:
2. Remove the left cover.

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After disassembling the left cover, the structure is as follows:

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3.2 Disassemble the Mainboard
The structure of the mainboard is as follows:
Connector
Definition
Connector
Definition
J1
Vertical lower end CCD
connector
J2
Horizontal near-end CCD
connector
J3
Horizontal far-end CCD
connector
J4
Laser plummet (lower)
connector
J5
Laser plummet (upper)
connector
J6
Display connector
J7
Display connector
J8
Compensator connector
J9
Vertical upper end CCD
connector
POWER
Power connector
RS232
Reserved
Please do not put the mainboard on the electroconductive surface.

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To disassemble the mainboard, do the following:
1. Use tweezers to remove the connectors J1, J2, J3, J4, J5, J8 and J9 on the front from
the mainboard.
It is suggested to make a mark for different connection before removing the
connections.
During this process, please be mindful of electrostatic protection.
2. Loosen four cross recessed pan head screws (M2.5X5) that fix the mainboard.
3. Use tweezers to remove the connectors J6, J7, POWER and RS232on the backfrom
the mainboard, and remove the mainboard.
3.3 Disassemble the Vertical Circle
You can clean the vertical circle with alcohol and cotton swabs.
To disassemble the vertical circle, do the following:
1. Loosen two cross recessed pan head screws (M2X16) that fix the cover:
2. Remove the cover:

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3. Remove three cross recessed pan head screws (M3.5X7.5) that fix the vertical circle,
and remove the vertical circle:
3.4 Disassemble the Right Cover
To disassemble the right cover, do the following:
1. Remove four 90°countersunk flat head screws M2.5X7 that fix the right cover:
2. Remove the right cover.

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After disassembling the right cover, the structure is as follows:

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3.5 Disassemble the Vertical Tangent Screw
To disassemble the vertical tangent screw, do the following:
1. Unscrew the shorter mandril seat of the vertical tangent screw, and remove the
shorter mandril seat.
2. Loosen the two hexagon socket set screws (M2X3).
There is no need to remove them.
3. Pull out the vertical tangent screw:

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3.6 Disassemble the Display
The structure of the display is as follows:
To disassemble the display, do the following:
1. Remove 4 slotted cheese head screws (M2X6) that fix the display.
Be careful. The buzzer exists on back of the display.
2. Pull out the display cable, and remove the display.
3. Repeat step 1~ 2to disassemble the other display.
3.7 Disassemble the LCD Module
To disassemble the LCD module, do the following:
1. Remove 10 type AB cross recessed pan head self tapping screws (ST1.7X5):

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2. Remove the LCD module:
3.8 Disassemble the Plate Level
To disassemble the plate level, do the following:
1. Loosen the correction screw of the bubble with the adjusting pin, and remove it.
2. Unscrew the slotted fixing screw of plate level with slotted screwdriver, take down the
slotted fixing screw.
3. Take down the plate level: