GT LASERS CYL-2000/S User manual

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ZHEJIANG GT LASERS TECH.CO., LTD.
CYL-2000/S
1.0μm Single Mode
Continuous Fiber Laser
User manual

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Before using this product, please read the user manual carefully. Please put the product
specification together with the product to provide you with relevant important
information at any time.
Attention
We reserve the right to modify the information in this manual without prior notice.
GT Lasers believes that the information provided in this manual is accurate and
reliable, but GT Lasers does not undertake any warranty regarding the contents of
this manual, including but not limited to the implied warranties of merchantability
and applicability. Moreover, GT Lasers will not be liable for any patent infringement
or damage to the rights and interests of any third party caused by the use of this
manual. GT Lasers will not be responsible for any error information in this manual.
GT Lasers is not liable for any accidental or indirect consequences arising from the
provision, execution, or use of this manual.
Direct or indirect use of the information provided in this manual does not mean that GT
Lasers authorizes any patent or other intellectual property.
Zhejiang GT Lasers Tech. Co., Ltd. All rights reserved. This content is not allowed to be
reproduced, transmitted, stored, or adapted for publication in any form or method without
the written authorization of GT Lasers, unless permitted by the relevant copyright law.

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Contents
1.0 Safety Information .............................................................................4
1.1 Security identity..................................................................................................................4
1.2 Laser safety level ................................................................................................................5
1.3 Optical security ...................................................................................................................5
1.4 Electrical security................................................................................................................5
1.5 Other safety precautions .....................................................................................................5
2.0 Description of Product .......................................................................5
2.1 Product characteristics ........................................................................................................5
2.2 Product advantage...............................................................................................................6
2.3 Main applications................................................................................................................6
2.4 Specification .......................................................................................................................6
2.5 Order information ...............................................................................................................7
3.0 Product Installation............................................................................8
3.1 Actual configuration list......................................................................................................8
3.2 Unpacking and inspection...................................................................................................8
3.3 Operating environment .......................................................................................................8
3.4 Product performance...........................................................................................................9
3.5 Notes .................................................................................................................................10
3.6 Installation dimensions .....................................................................................................10
3.7 Installation notes ...............................................................................................................10
3.8 Precautions for the cooling system ...................................................................................11
4.0 Use of Products .................................................................................12
4.1 Front panel of the product.................................................................................................12
4.2 Rear panel of the product..................................................................................................13
4.3 Control interface definition..................................................................错误!未定义书签。
4.4 Power connection..............................................................................................................15
4.5 Start operating procedures ................................................................................................17
4.6 Control Mode Selection ....................................................................................................17
4.6.1 External control mode (daily use status)................................................................17
4.6.2 Internal control mode (for debugging only)...........................................................17
5.0 Quality Assurance and Repair and Return Process .....................18
5.1 General warranty...............................................................................................................20
5.2 Services and maintenance .................................................................................................20
5.3 Change ..............................................................................................................................20

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1.0 Safety Information
Thank you for choosing GT Lasers fiber laser, this user manual provides you with important safety,
operation, maintenance, and other information. Therefore, please read this user manual carefully
before using this product.
We will use different words and characters to alert you to potential hazards and important
information, including:
1.1 Security identity
WARNING
May cause serious personal injury or even endanger life.
CAUTION
May cause general personal injury or damage to products or
equipment.
IMPORTANT
This symbol represents laser radiation and this symbol
appears on products with laser output.
Safety Guidance
To ensure safe operation and optimize the performance of this product, please strictly abide by
the following WARNINGs and CAUTIONs, and other information contained in this manual.
WARNING: when using this product, please make sure to use the appropriate
grounding power.
WARNING: the user is not allowed to open any part inside the product for
maintenance. If necessary, please contact GT Lasers technicians to provide maintenance
services. Any unauthorized changes to this product will result in the warranty invalidation.
WARNING: the output connector of this product is connected by fiber optic cable and
laser. Please use the output connector carefully.
WARNING: if this product is not operated in accordance with the instructions. The
protection mechanism provided by this product may be affected. This product must be and
can only be used under normal conditions.
CAUTION: when operating the fiber output connector (such as installing the connector,
testing the connector end face with an optical instrument), be sure to keep the AC power off.

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1.2 Laser safety level
According to European standard EN 60825-1, clause 9, this series of lasers belong to 4 types of
laser instruments. The product emits laser radiation with a wavelength of 1080nm or around
1080nm, and the optical power radiated from the output head is greater than 100W~3000W
(depending on the model). Direct or indirect exposure to such light intensity can cause damage to
the eyes or skin. Although the radiation is invisible, the laser beam can cause irreparable damage
to the retina or cornea. Suitable and certified laser protective glasses must be worn throughout the
operation of the laser.
WARNING: laser safety protective glasses should be worn throughout the operation of
the product. Laser safety protective glasses have laser wavelength protection selectivity, so
please choose the laser safety protective glasses that accord with the laser output band of
the product. Even if you wear laser safety glasses, it is forbidden to watch the output head
directly when the laser is electrified, whether or not it is in the state of light.
1.3 Optical security
If there is dust on the lens of the laser output head, the crystal of the laser output head will be
damaged or the laser will cause irreparable damage.
CAUTION: do not output the laser without the laser output head protection cap
removed, otherwise the laser output lens or crystal will burn down.
1.4 Electrical security
Ensure the product ground wire is effectively grounded and the environment is safe and reliable.
WARNING: product grounding disconnect will cause the laser shell to be electrified,
which may cause personal injury to the operator.
Ensure the AC voltage supply is normal.
CAUTION: the wrong wiring or supply voltage will cause irreparable damage to the
laser.
1.5 Other safety precautions
Do not look directly at the laser output head while the laser is running.
Do not use fiber laser in dark.
Please strictly follow the laser manual to operate the laser, otherwise any damage to the laser will
not be guaranteed.
The laser does not have built-in usable accessories, all repairs should be carried out by GT Lasers
technicians. To prevent electric shock, please do not damage the label or remove the lid, otherwise
any damage to the laser will not be guaranteed.
2.0 Description of Product
2.1 Product characteristics
GT Lasers CYL-1000/S, CYL-1500/S, CYL-2000/S, CYL-3000/S single-mode 1.0μm

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continuous fiber laser uses the latest technology and optimum design. It has the advantages of
high electro-optical conversion efficiency, long service life, high safety, and reliability. With good
output beam quality and strong anti-high reflective ability, which can be widely used in laser
cutting, welding, drilling, 3D printing and other fields.
GT Lasers has established a scientific after-sales service system with Internet technology. Each
equipment has a unique identity code (that stores the original technology and material information
of the machine), which can be used for remote real-time monitoring online, providing users with
fault warning, quick technical support and after-sales service.
GT Lasers with its high quality, high reliability and excellent cost performance, can meet the
diverse needs of customers, customization and good after-sales service, which is an ideal choice
for system integrators and equipment manufacturers.
2.2 Product advantage
High electro-optic conversion efficiency greatly reduces power consumption cost
Strong anti-high reflective ability, suitable for processing different materials
Remote real-time monitoring
Long service life, high safety and reliability
Personalized customization
Good after-sales service system
Excellent performance-to-price ratio
2.3 Main applications
Laser cutting, laser welding, laser cladding, laser brazing, laser surface heat treatment, etc.
2.4 Specification
Performance
Min.
Typ.
Max.
Remarks
Optical characteristics
Central wavelength
(nm)
1070
1080
1090
Spectral bandwidth
(nm)
3
5
-3dB
Output
optical
power
CYL-1000/S
(W)
1000
CYL-1500/S
1500
CYL-2000/S
2000
CYL-3000/S
3000
Short time power stability
（%）
±1
Long time power stability
（%）
±2
Laser opening time
(μs)
50~100
Laser shutdown time
(μs)
100~200
Power regulation range
(%)
10
100
Beam quality
(M2)
1.3
QBH-20/400
2.8
QBH-50/360
Modulation frequency
(KHz)
5
20
100% output
Red light Power
(mW)
5
60
Output
characteristics
Output connector
QBH
Customizable
Output fiber core diameter
(μm)
20
100
Output fiber length
(m)
15
Customizable
Output cable bending radius
(mm)
200

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Work model
Continuous/modulation
CW/Modulate
State of polarization
Random
Random
Electrical cooling characteristics
Communication interface
RS232/AD /Super terminal
Remote communication
APP
Customizable
Power supply
(V)
220
Power
consumption
CYL-1000/S
(KW)
3.0
Single phase three
CYL-1500/S
4.5
CYL-2000/S
6.0
220 V in two groups
CYL-3000/S
8.5
Cooling mode
Water cooling
External
Cooling water temperature
(°C)
20
28
Cooling water
flow
CYL-1000/S
(L/min)
10
CYL-1500/S
20
CYL-2000/S
25
CYL-3000/S
40
General characteristics
Working ambient temperature
(°C)
10
40
Working environment humidity
(%)
10
85
Storage temperature
(°C)
-10
60
Structure
Rack
Weight/
Size
CYL-1000/S
(kg)
38
(W)×(L) with
Handle)×(H)
(mm)
482.6(440)×451×104
CYL-1500/S
40
482.6(440)×451×104
CYL-2000/S
43.4
482.6(440)×596×111
CYL-3000/S
53
482.6(440)×666×111
2.5 Order information

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3.0 Product Installation
3.1 Actual configuration list
Please refer to the packing list in the packing box.
3.2 Unpacking and inspection
Through specially designed packaging materials and boxes, GT Lasers ensures that the laser can
always be fully protected during transportation. Nevertheless, to prevent the unpredictable
situation in the transportation process, the user still needs to carefully check whether the packing
box is placed correctly and whether there is any damage such as collision, cracking and flooding
outside the box before opening the box. Once the external box is found to be abnormal, please
inform GT Lasers in time so that we can deal with it as soon as possible.
After unpacking, please check whether the packing list is consistent with the actual items. If in
doubt, please contact GT Lasers in time.
When the laser is taken out of the box, attention should be paid to avoid the collision or violent
vibration to the laser. When taking out the coiled laser output cable, we should pay special
attention to it, do not twist, bend, pull the laser output cable, and avoid the collision and vibration
of the laser output head.
CAUTION: laser output cable is a precise optical device, twisting or overbending the
output cable, vibration and impact of the laser output head will cause irreparable damage
to the laser.
3.3 Operating environment
Supply voltage (V)
AC 220V±10%, 50/60Hz
Power supply capacity (KW)
Less than 7.5
Environment of placement
Smooth without shock or impact
Operating ambient temperature (℃)
10～40
Operating ambient humidity (%)
30-70
1) Ensure reliable grounding before using the laser.
2) The laser output head is connected to the output optical cable. Please check the laser output head
carefully to prevent dust or other pollution. Please use special lens paper when cleaning the laser
output head.
3) If the laser is not used as specified in this manual, the laser may be in an abnormal working state
and cause damage.
4) It is forbidden to install the laser output head when the laser is in operation.
5) Do not directly watch the laser output head, and be sure to wear laser protective glasses while
operating the laser. The best reliability and performance will be acquired when the laser is
installed in an air-conditioned environment.

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CAUTION: do not expose this product to a high humidity environment
(humidity >95%). Do not let this product work below the dew point temperature. (As Table
below)
CAUTION: in actual use, the ambient temperature exceeds 30℃. In order to
effectively prevent condensation, clean dry air should be injected into the one-way air inlet
valve at the back of the chassis, and the air pressure should be kept at 0.1Mpa.
3.4 Product performance
The technical parameters of the laser are as follows:
Optical characteristics
Output power (W)
2000
Working mode
Continuous or pulsed
Polarization direction
Randomized
Central wavelength (nm)
1080
Optical output characteristics of QBH output heads
Numerical aperture (NA)
0.22
Fiber Core Diameter (μm)
50
Output fiber length (m)
15
Electrical characteristics
Working voltage
AC 220V±10%, 50, 60HZ
Other characteristics
℃Size (W×L ×H )(mm)
482.6(440)×451×111
Operating ambient temperature range (℃)
10～40
Operating ambient humidity range (%)
30～70
Storage temperature (℃)
-10～60
Cooling mode
Water cooling
Constant dew point table at ambient temperature and relative humidity
Ambient
temperature ℃
Maximum relative humidity
20%
30%
40%
50%
60%
70%
80%
90%
95%
20
-3.5
2
6
9
12
14.5
16.5
18
19
25
0.5
6
10.5
14
16.5
19
21
23
24
30
4.6
10.5
15
18.5
21.5
24
26
28
29
35
8.5
15
19.5
23
26
28.5
31
33
34
40
13
20
24
27.5
31
33.5
36
38
39
Laser operating temperature range

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3.5 Notes
1) Before connecting the laser to the AC power supply, ensure that it is connected to 220V AC
voltage, wrong connection to the power supply will cause irreparable damage to the laser.
2) It is very important to ensure that the output end of the adjusted laser output head is clean,
otherwise the laser will be irreparably damaged.
3) When the laser is not used, please cover the output head protective cap, do not touch the lens at
the output end. If necessary, use special lens paper and alcohol to clean the lens.
4) The loss of optical power may be caused by incorrect operation by the above specifications, such
loss will not be covered by warranty.
3.6 Installation dimensions
Figure 1 Laser dimensions (unit: mm)
Figure 2 QBH Output head (unit: mm)
Before the laser works, the two copper contacts (Interlock pins) on the output head must be short
connected, otherwise the laser cannot work normally.
3.7 Installation notes
1) Placing the laser horizontally in an appropriate position and fixing it as necessary.
2) Please check whether the AC power supply of the laser is at the appropriate voltage (2 sets 220V
AC±10%, 50/60Hz) and whether the grounding wire is good before the laser is powered on.
3) Connect the power line to the control cable of the laser in the uncharged state.
4) Connect the cooling system to the laser and the output head according to the the water inlet and
outlet mark.
5) Please check the output head of the laser, make sure it is clean and then install it on the equipment.
6) Do not step on, squeeze or overbend the protective tube during the installation of the jumper wire
to avoid damage to the optical fiber.
7) In the process of installing the jumper output head, the surrounding environment should be kept
clean (do not use an electric fan to dissipate heat in summer to avoid heavy dust in the air).

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8) The minimum bending diameter of the transmission fiber of the laser should not be less than 20cm
in the non-working state such as transportation and storage; the minimum bending diameter
should not be less than 30cm in the laser emitting state.
CAUTION: all control lines of the lasers should be connected in a non-electric state,
and the live installation of control lines may cause laser damage.
CAUTION: (1) if the winding diameter of the output cable is too small, the laser will
be damaged. (2) The lens and cutting head cavity must be clean before assembling the laser
output cable. (3) Please take good care of the output head protective cap to prevent it from
being polluted. Otherwise, it will cause indirect pollution to the output head when the cap is
covered.
3.8 Precautions for the cooling system
Parameters
Unit
2000W
Refrigerating capacity
KW
≥5
Min. flow
L/min
25
Max. output pressure
Bar
7
Water pipe size
mm
hosepipeφ16
Water temperature setting for the cooling system: 24±1℃;
Cooling system requirements:
1) Purified water is used for cooling water. It is recommended to use purified drinking water.
2) To prevent mold growth in the chiller from clogging the pipe, it is recommended to add
ethanol when filling the purified water. The amount of ethanol should be 10% of the purified
water.
3) When the ambient temperature of the equipment is -10℃～0℃, ethanol solution with a
volume ratio of 30% must be used and replaced every two months.
4) When the ambient temperature of the equipment is below -10℃, a dual-function chiller must
be used and the cooling system must be kept in continuous operation.
Other requirements for cooling system:
(1) When starting the cooling system for the first time, the leakage of water throughout the waterway
system and joints shall be checked. The external water pipe must be installed and connected
according to the inlet (IN) and outlet (OUT) identified by the laser, otherwise the laser may not
work properly.
(2) If the laser is not used for a long time, the cooling water inside the cooling system and the laser
should be emptied, otherwise it will cause irreparable damage to the laser.
(3) When emptying the cooling water of the laser water cooling system, customers should use
compressed gas with pressure less than 0.5 MPa, otherwise it will cause irreparable damage to
the water cooling system.

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Water cooling requirements for output cables:
Cooling water flow: 1.7-2.0L/min
Water cooling pressure: inlet less than 0.6Mpa
Water pipe type: outer diameter ϕ6 inner diameter ϕ4
Cooling water direction: unidirectional, connect the water pipe in strict accordance with the water
inlet and outlet direction marked on the shell.
Cooling water quality: deionized water, distilled water, purified water
Cooling water PH range: 5.5-9
A water cooler shall be equipped with a filter element with a filter particle size of less than 100
um.
Max. cooling water temperature: 40℃
Min. cooling water temperature: 5℃ higher than saturated dew point temperature
Additives in cooling water: meet the above requirements of PH values and solid particle size
Long-term vibration, less than 2G; impact, less than 10G.
CAUTION: correctly set the water temperature of the cooling system according to the
ambient temperature. Setting the water temperature too high will lead to the laser cannot
work properly, setting the water temperature too low will lead to condensed water to be
generated inside the laser or in the laser output cable, which will cause irreparable damage
to the laser.
CAUTION: before turn on the laser, please ensure the cooling system work normally
and the water temperature reaches a suitable temperature.
4.0 Use of Products
4.1 Front panel of the product
REM /ON: key switch, insert key and rotate to "ON" or "REM" position, the laser will enter
external control or internal control mode.
POWER: power indicator light, blue light indicates that the power is on.
LASER: laser indicator light, yellow light indicates that the laser is working.

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ALARM: alarm indicator light, red light indicates the machine failure.
EMERGENCY: emergency stop switch, press it to turn off the laser immediately and rotate
clockwise to release the button. Use the key switch to power on the laser to back to normal.
4.2 Rear panel of the product
AC INPUT: AC power input socket, must be used with the plug provided by GT Lasers. This
socket has a lock.
SERVICE: these service connectors provide control signals (DB15 connector), I/O (DB25
connector), RS232 communications, LAN, users can set control modes, input analog voltage
signals, modulate 24V signals, and are also alarm signal output connectors.
RS-232 Serial Port Introduction
Each pin is defined as follows:
Pin NO.
Definition
2
TX
3
RX
5
GND
Other
Idle

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4.3 Control interface definition
DB15 Control Interface Diagram
DB25 pin is defined as follows:
Pin NO.
Definition
Remarks
1(EN+)
Remote control light, front panel red indicator light up.
Emission enable
（5-24V）
2(EN-)
GND
（0V）
18(PWM+)
Modulated signal input
（5-24V）
19(PWM-)
Return
（0V）
20(DA+)
Analog input to control current
（0-10V）
21(DA-)
GND
（0-10V）

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Note: please check the level of the control signal to ensure compliance. Voltage excess or
voltage fluctuation may damage the laser. Ensure that the analog voltage signal does not
exceed 10V, otherwise the laser may be damaged.
Control signal line
All the control signals of the laser are
concentrated on the control signal (DB25
interface) port of the rear panel. The diagram on
the right shows the control signal line provided
by our company.
CAUTION: please check the level of the control signal to make sure it meets the
requirement. Voltage excess or voltage fluctuation may damage the laser.
LAN: laser LAN communication, can monitor the running state of the laser.
WATER: waterpipe interface, inlet and outlet are used for cooling water inflow and outflow.
This interface is suitable for Ф16 hosepipe pagoda interface.
AC POWER: control the on-off of alternating current.
Power switch on rear panel
CDA (right picture): clean and dry air
interface, access clean and dry air to
prevent laser condensation..
CDA usage:
1) The CDA needs to be dried and cooled
by a cold dryer, through 5um and
0.3um particle filters, and 0.1um oil
mist filter, respectively. The temperature is in the range of 5-40℃, the highest dew point is
0℃(it is recommended that the compressed air temperature is 5℃ lower than cooling
water temperature), the air pressure is around 0.1mpa, the flow rate is set at 10LPM, and
the interface pipe diameter is 6-12mm.
2) Ventilation shall be started 30min before the CDA starts. Ventilation can be stopped when the
temperature is lower than 10℃ and humidity is lower than 50% in winter.
4.4 Power connection
CAUTION: (1) before connecting to the AC power supply, please check that the laser
model is consistent with the AC power supply below. (2) The wrong connection will cause
damage to the laser, so please check that the power cord connection is correct before the
laser is powered on.

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Power outlet
The other end of the power supply is
a stripped four-strand wire, which
marks as, L1, L2, N and PE. It can be
connected to two groups 220V AC
power supply according to the wire
mark. The power cord must be
reliably connected as shown in the
table before the laser is powered on.
power-line connection
Depending on the power of the laser, below 2KW: using 220V single-phase three-wire power
cords, circuit breakers with a rated working current≥60A; 2KW-3KW: using 4-core wires,
380V three-phase four-wire, circuit breaker with rated working current ≥100A.
All circuit breakers used must have zero line and be effectively grounded.
The power cord must be connected when the power is off.
Take out the power cord in the packing box, insert one end into the AC power interface of the
laser, and connect the other end of the power cord to the correct hole according to the mark on
the line (as shown in the figure)
Makes
Color
Definition
L1
Red
Fireline
L2
Yellow
Fireline
N
Green
Zero line
PE
Blue
Grounding

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The power cord provided by our company:
Insert the plug at the end of the power supply into the AC power interface on the rear panel. Note
that the plug has an anti-reverse connection function.
CAUTION: please check the level of the control signal to make sure it meets the
requirement. Voltage excess or voltage fluctuation may damage the laser.
4.5 Start operating procedures
Make sure that the air switch on the rear panel of the laser is disconnected and that the
"EMERGENCY STOP" button on the front panel has been pressed. All electrical connections
must be completed before the laser is powered on.
1) Turn on the chiller to ensure that there is no leakage throughout the waterway. The chiller starts
working and the water temperature is at the appropriate working temperature (refer to 3.8
Precautions for the cooling system).
2) Release the "emergency stop" switch on the front panel of the machine, and then turn the power
switch on the rear panel to "ON".
3) Turn on the laser power supply and all the indicator lights on the panel are off (DB15 PIN7 input 0V).
The laser enters the on-going state.
4.6 Control Mode Selection
4.6.1 External control mode (daily use status)
1) Turn the key switch to "ON".
2) Wait for the completion of the laser self-test (about 10s), the front panel "POWER" indicator light is
always on. The laser is turned on by an external controller connected by the DB15 signal line (PIN7
provides 24V voltage to enable the laser output) .
4.6.2 Internal control mode (for debugging only)
1) Turn the key switch to "REM".
2) Wait for the internal main control board circuit initialization completed (about 10 S), and the front
panel "POWER" indicator light will be on.
3) Connect the laser with the computer with the RS232 serial port line, and control the laser through
the computer control software.

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Steps：
1) Please turn on the computer and
insert the U disk, as shown in the
figure: click the PL2303 folder,
double-click to install the driver.
One end of the RS232 line is connected to the
RS232 interface on the rear panel of the laser, and
one end is connected to the USB interface on the PC.
When the laser is powered on, press the Power switch button on the rear panel, and the green
light of the button is always on.

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2) Double-click GT Fiber Laser Control System V1.23 (laser control software).
3) Click Refresh , select the corresponding port and connect.
4) QCW mode：the optical laser can produce pulse of μs magnitude,
duty cycle is 10%. This allows the pulsed light to have a peak power
of more than ten times the average power, which is very beneficial
for applications such as drilling. The repetition frequency can be
modulated up to 2KHz according to the pulse width.
5) Select quasi-continuous (QCW) in PWM working mode.
6) The default (minimum) value of PWM quasi-continuous pulse width is 50μs, and the default
(minimum) value of PWM quasi-continuous cycle is 500μs.
Customers can increase the value of quasi-continuous cycle according to the requirement, and increase the
percentage of quasi-continuous pulse width to set the working frequency of the o

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5.0 Quality Assurance and Repair and Return Process
5.1 General warranty
Unless otherwise specified, GT Lasers provides a 24-month warranty for all products for material
defects and quality problems (from the date of shipment). GT Lasers will choose 1) repair 2)
replace 3) refund products that are confirmed to be defective and still within the warranty period.
All repaired or replaced products continue to use the initial warranty period of the original repair
product, that is, free repairs can be submitted only during the remaining warranty period of the
original repaired product. The buyer must submit written repairs within 30 days after finding any
quality problems. All repair requests must be submitted directly by the buyer, GT Lasers will not
accept any third party repair requirements.
The above repair is not applicable to product problems caused by the following situations:
1) Incorrect or improper maintenance or calibration performed by non-GT Lasers personnel.
2) Software, interfaces or power supplies provided by customers or third parties.
3) Unauthorized maintenance or repair, incorrect operation beyond the limits of product parameters.
4) Abuse, negligence, accident, loss or damage during transportation;
The technical guidance and service provided by GT Lasers to customers will not affect the
warranty terms provided by GT Lasers.
5.2 Services and maintenance
CAUTION: there are no built-in parts for user maintenance. All maintenance shall be
carried out by GT Lasers personnel. Therefore, the maintenance or replacement
requirements in the warranty scope must be notified to GT Lasers or the service
representative as soon as possible. Approved returned products must be placed in suitable
containers.
If the goods are found to be damaged, it shall be reported to the carrier in writing in time.
IMPORTANT: please do not return the product to GT Lasers without a Return
Merchandise Authorization (RMA). If the warranty period of the product has expired, or
the product is not within the scope of maintenance, the buyer will bear the maintenance
costs.
IMPORTANT: users should keep the software log files properly for the convenience
of the GT Lasers maintenance personnel for fault analysis.
5.3 Change
We reserve the right to change the design and structure of the products, and we will not be
responsible for any modification of the same model products that have been sold.