Dawei Laser Technology DAVI D30 RF CO2 User manual

Beijing Dawei Laser Technology Co., Ltd.
The Most Professional CO2 Laser Supplier
Beijing Dawei Laser Technology Co., Ltd.

Beijing Dawei Laser Technology Co., Ltd.
The Most Professional CO2 Laser Supplier
Content
Company Introduction....................................................... 3
Hazard Information............................................................ 4
Model D30 Laser Specification working condition............. 9
D30 Laser signal wiring method & Note.......................... 10
Utility Requirements and System Installation.................. 11
Laser Operation .............................................................. 14
Maintenance and Troubleshooting.................................. 19
D30 Laser Tube Picture .................................................. 21
Structure Drawing ........................................................... 22
Condensation.................................................................. 22
Common questions and answers during Laser use........ 23

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Company Introduction
Beijing Dawei Laser Technology Co., Ltd. is professional high-tech enterprise
in the laser industry with elites from laser area, optics area, electrics and
mechanical field, and computing industry. Our company has been engaged in
R&D and production for RF CO2 laser tube for more than 10 years.
Our products are widely used in medical, cosmetic, electronic components,
machinery parts, laser engraving, laser marking, packaging, printing and other
industries. We have supplied our core products to more than 100 customers all
around domestic market and overseas market has been to provide many
relevant enterprises core components.
The company has an excellent R & D team to strive for excellence of high
technology in laser area, we dedicate to produce and provide high quality
products for the domestic and international customers with the best technical
support and after-sales maintenance services.
Since the establishment of the company, it keeps "professional, honest,
trustworthy” as business philosophy, and approaches "the most reasonable
prices, the most complete services, providing the best products," as service
goal, and sets "provide first-class products and services " as business goal.
Our company is one of best laser related products maker with professional
technical personnel, modern management system, diligent dedication of the
marketing team by hard work and excellent governance.
In order to maintain the leading technology, build long-lasting business, our
company continues to increase investment in scientific research, adhering to
the people-oriented and service-oriented, is committed to wide spread our
brand to all over the world to create the greatest value of development for our
company.

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Hazard Information
Hazard information includes terms, symbols, and instructions used in this
manual, or on the equipment, to alert both operating and service personnel to
the recommended precautions in the care, use, and handling of Class 4 laser
equipment.
Terms
Certain terms are used throughout the manual or on the equipment labels.
Please familiarize yourself with their definitions and significance.
Danger Imminent hazards which, if not avoided, will result
in death or serious injury.
Warning Potential hazards which, if not avoided, could result
in death or serious injury.
Caution Potential hazards or unsafe practices which, if not
avoided, may result in minor or moderate injury.

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General Hazards
Danger –Serious Personal Injury
This Class 4 laser product emits invisible infrared laser radiation at 10.6µm.
Do not allow laser radiation to enter the eye by viewing direct or reflected laser
energy. CO2laser radiation can be reflected from metallic objects even though
the surface is darkened. Direct or diffuse laser radiation can inflict severe
corneal injuries leading to permanent eye damage or blindness. All personnel
must wear
eye protection suitable for 10.6µm CO2radiation when in the same area as
an exposed laser beam. Eyewear protects against scattered energy but is not
intended to protect against direct viewing of the beam. Never look directly
into the laser output aperture or view scattered laser reflections from metallic
surfaces.
Enclose the beam path whenever possible. Exposure to direct or diffuse CO2
laser radiation can seriously burn human or animal tissue, which may cause
permanent damage.
This product is not intended for use in explosive, or potentially explosive,
atmospheres.
Warning –Serious Personal Injury
U.S. customers should refer to and follow the laser safety precaution
described in the American Nation Standards Institute (ANSI) Z136.1-2007
document, Safe Use of Lasers. Procedures listed in this Standard include the
appointment of a Laser Safety Officer (LSO), operation of the product in an
area of limited access by trained personnel, servicing of equipment only by
trained and authorized personnel, and posting of signs warning of the
potential hazards.
European customers should appoint a Laser Safety Officer (LSO) who should
refer to and follow the laser safety precautions described in EN60825.1-2007,
Safety of Laser Products.
Warning –Serious Personal Injury
Materials processing with a laser can generate air contaminates such as
vapors, fumes, and/or particles that may be noxious, toxic, or even fatal.

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Material Safety Data Sheets (MSDS) for materials being processed should
be thoroughly evaluated and the adequacy of provisions for fume extraction,
filtering, and venting should be carefully considered. Review the following
reference for further information: ANSI Z136.1-2007, Safe Use of Lasers.
Warning –Serious Personal Injury
The use of controls or adjustments, or performance of procedures other than
those specified herein, may result in hazardous radiation exposure.
Laser Safety
To prevent exposure to direct or scattered laser radiation, follow all safety
precautions specified throughout this manual and exercise safe operating
practices per ANSI Z136.1-2007 always when actively lasing.
Always wear approved Laser Safety Glasses with a minimum OD (Optical
Density) 4.27 for a wavelength of 10.6µm.
A CO2laser can ignite most materials under the proper conditions. Never
operate the laser in the presence of flammable or explosive materials, gases,
liquids, or vapors.
Other Hazards
The following hazards are typical for this product family when incorporated for
intended use: (A) risk of injury when lifting or moving the unit; (B) risk of
exposure to hazardous laser energy through unauthorized removal of access
panels, doors, or protective barriers; (C) risk of exposure to hazardous laser
energy and injury due to failure of personnel to use proper eye protection
and/or failure to adhere to applicable laser safety procedures; (D) risk of
exposure to hazardous or lethal voltages through unauthorized removal of
covers, doors, or access panels; (E) risk of exposure and/or interference from
radio-frequency (RF) electro-magnetic energy through unauthorized removal
of covers, doors, or access panels; (F) generation of hazardous air
contaminants that may be noxious, toxic, or even fatal.
Introduction
This guide provides the basic information needed to operate an Iradion Laser.
This laser is designed for use while integrated within a system and is not
designed to meet CDRH requirements as a stand-alone product. As such, the
user must be aware of certain requirements before use.

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CDRH
This is an OEM laser component that has been designed for integration into a
functioning laser system. As a stand-alone device, it cannot be turned on and
therefore does not incorporate all the safety features required by the Center for
Devices and Radiological Health (CDRH). Provisions for the incorporation of
these safety features are available, and it is expected that the user will apply
them and fully comply with all CDRH requirements.
Available Safety Features
The following safety features are available as electronic signals on the
rear panel interface:
Interlock
Upon contact closure, allows the system to operate. An open connection will
prohibit the laser from firing.
Key switch
Upon contact closure, allows the laser to fire after imposing a 5-second delay.
(Key switch function is program version dependent.)
Power up in Fault
Requires the key switch to be cycled. (Program version dependent.)
Lase signal
Output signal indicating the laser is firing.
Fault signal
Output signal indicating the malfunction of an internal component or
the electronics.
Indicator lights
DC Power, Temp Warning, Interlock, Fault, Ready, Lase.
Caution
The lasers are waveguide lasers with a “slab” unstable optical resonator. The
resulting elliptical beam is corrected by a cylindrical lens in the black extension
tube mounted to the faceplate. This assembly is exactly positioned so that the
beam direction is close to the original elliptical beam. Removal of the cylindrical
lens assembly will result in the loss of this original alignment and will require a
procedure for replacement.
Caution

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The optical intensity at the cylindrical lens is VERY high (>6000W/cm2). Any
contamination to the optical surface could cause runaway destruction of the
lens. Do NOT burn materials close to the lens or leave fingerprints on the
lens.
Caution
The cylindrical lens comes with a pink plastic cap that covers the lens for
protection. Remove this cap before applying DC power. Firing the laser
through the cap WILL cause permanent damage to the lens.

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Model D30 Laser Specification working condition
Model
D30
Wavelength
10.55 µm to 10.63µm
CW Output Power
≥30W
Power Stability
<±5%
Mode
>98%TEM00
Beam Size
1.8±0.2 ㎜
Beam Divergence
7.5±0.5 mrad
Mode Quality
M²<1.2
Polarization
>100 to 1 fixed linear
Weight of Laser System
11.5 1bs(5.2kg)
Input voltage
48 VDC <±2% regulation
<1%P-P Noise/Ripple
Input DC current
≤12A
Ambient Air Temperature
5℃to 40℃
Altitude
<6,500 ft.(2,000m)
Humidity
Non-condensing
Attention:
1. Laser power is tested according to the temperature of laser which is 25，
everytime the laser temperature rises 1℃, the output power will reduce 1%.
2. Definition of stabilization: ±（Pmax－Pmin）/（2Pmax）.
3. Testing condition of stabilization: Warming up about 10mins, controlling
duty cycle constantly, under the normal operating environment.

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D30 Laser signal wiring method & Note
PIN NO
SIGNAL DESCRIPTION
1（PWM Orange and white）
RF Enable
TTL logic input
1=RF ON,0=RF OFF；1KΩ impedance.
This input turns on the laser. (See also Pin 7, Control
Enable, below)
2(+15V Orange)
+15 VDC±0.5VDC,0.25 A Max output for customer use
3(Laser Green and white)
Laser ok
TTL logic output,1=LASER OK,0=LASER Fault;
Output is asserted when no faults (SWR, Temp or Volt.)
are detected
4(Temp Blue)
Temperature OK
TTL logical output,1=Temp ok,0=Temp fault;
Output is asserted when temperature is below 60℃
5(Volt Blue and white)
Power and voltage OK
TTL logical output;1= voltage ok,0=voltage fault;
Output is asserted when DC supply voltage is below
max. value
6(GND Green)
For internal use. must be grounded
7(Enable Brown and white)
Control enables
TTL Logical input；1= Laser control enable，0= Laser
controlled disabled
This input must be asserted before RF enable can be
used to turn on the laser.
8(GND Brown)
GND
Attention：
1) The connector uses the RJ-45 type
2) These specifications are subject to change

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Utility Requirements and System Installation
Unpacking and Inspection
Before unpacking the laser components, inspect the shipping carton for
evidence of rough handling, and note any damage. If damage to the shipping
carton is evident, request the carrier’s agent be present when the unit is
unpacked. Inform the Shipping carrier and DAVI of any evidence of damage in
shipment. The Buyer and shipping carrier are responsible for any damage
which occurs during shipment.
Verifying Delivery
The shipping container contains the following:
•Laser head and integral RF power supply
•Final Test Sheet
•This Operating Manual
If any of these items are missing, report this to DAVI Immediately.
Checking Delivered Items
Verify that the delivered laser head model is that same as the one ordered. If
there is any discrepancy noted, contact DAVI immediately.
DAVI recommends that the shipping box and packing materials be saved, as
these will be useful should the laser need to be shipped back to DAVI.
Safety Issues in Laser Installation
Installation of the D30 laser must comply with all applicable electrical safety
and laser safety laws and regulations. Review Laser Safety for important
information relating to Safety.
The negative (return) side of the DC input connection to the D30 RF power
supply is connected internally to the chassis. The user must assure that the
system into which the D30 is built protects against the possibility that the D30
laser head or RF power supply chassis could be at a hazardous voltage and
that personnel could be exposed to these voltages.
The laser must be secured properly to avoid the possibility of the laser shifting
unexpectedly during operation, creating a hazardous condition. The location of
the output beam of the D30 laser head is shown in Figure 3. The laser output is
emitted from the aperture shown in the referenced figures and propagates
within a full cone angle up to 5°. The acceptance angle of the system aperture
must intercept all the output of the output of the laser.
DAVI recommends that all beam propagation paths be enclosed and that
personnel operating the laser be qualified optical technicians who are familiar
with this type of hardware.
Mechanical Mounting
The dimensions for the D30 laser head are shown in Figure 3. Mechanical
mounting of the D30 laser head must result in on distortion or stress the laser
head in any way. Otherwise, optical alignment and power stability could be
adversely affected
Mounting Considerations for D30
Certain aspects of specific customer applications may preclude absolute

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interchangeability of laser heads. For example, for certain applications, the
sensitivity of the application to optical beam pointing errors may require optical
realignment after the laser head is replaced in the customer's integrated
system.
Depending on the method of mounting and the sensitivity of the integrated
customer system to beam pointing errors, even removing a laser head from the
customer's system, then replacing the same laser head back into the
customer's system may require optical realignment. Consult issues.
DAVI recommends use of the optional brackets that are designed for mounting
the laser safely without inducing any stress onto the laser. In any case, take
care not to induce stress onto the laser head, as optical misalignment can
occur, which would require the laser to be returned to DAVI for service. A
mechanical drawing for this bracket is provided in the Appendix A. DAVI
strongly encourages use of this bracket or a similar design in order to
accommodate temperature changes in operation while providing secure
mounting.
Ambient Air Cleanliness
D30 laser heads are designed for use in a dust-free or nearly dust-free
environment. They should be installed in a protective. Housing that prevents
dust or debris from contaminating the optical output window. Do not turn the
laser on if there is water, dust, or dirt on the output element; otherwise,
damage to the coating on this optical element may occur. To prevent such
optical damage, never allow the output window to become contaminated.
Do not allow the fins on the heat-sinking elements to become clogged with dirt,
dust, or debris. They must be cleaned periodically as indicated in Section Five:
Maintenance and Troubleshooting. The DAVI warranty covers defects in
material and workmanship relating to the output optical element, but this
warrant does not cover damage to the external output surface which is the
result of contamination of the surface, or abrasion of the surface.
Air Cooling
The D30 air-cooled laser incorporates heat sinks cooled by forced air (blown
by fans). The four fans draw 1 A of current when supplied with the required 48
VDC electrical power. Running the fans at higher voltages will reduce the
operating life and is strongly discouraged. The user must provide the correct
voltage polarity to the fans for the airflow. Direction to be enough to cool the
laser adequately.
Air Flow
For the D series of air-cooled lasers, open-air flow for the laser system is
critical. Therefore, DAVI requires clear access to free air within 60 mm of the
cooling fans and fins for the laser system. The air used to cool the D30 must be
clean and free of contaminates. This requirement be fulfilled by filtering the air
at the input to the laser cavity or system equipment.
Signal Interface
The signal interface in the laser interlock system shuts the laser off when the
fans fail to operate. With this approach, the laser is commanded through the
signal interface to shut down if the airflow interlock system detects excessive
heat. DAVI recommends that both RF Enable and Control Enable be
commanded to the OFF state when the airflow interlock system detects an
over-temperature fault. These signals are listed in Table 1 and further

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discussed in subsections of Section Four: Laser Operation.
Electrical Power Connection
The D30 laser requires 48 VDC input DC power. This power is carried from the
power source to the system through the terminal block on the D30. The
maximum current required is 12 A.
The negative (return) side of the DC input connection to the D30 RF power
supply is connected internally to the chassis.
The user must assure that the system into which the D30 is built protects
against the possibility that the D30 chassis Could be at a hazardous voltage
and that personnel could be exposed to these voltages. DAVI strongly
recommends that the user review the precautions described in Section Two:
Laser Safety regarding electrical safety before using the D30 laser. It is the
user's Responsibility to provide circuit breakers and/or fusing of the AC power
source, in accordance with all applicable laws and regulations.
DC Power Supply Requirements
The following are the requirements for the customer-supplied DC power
supplies.
Control Signal Connection
Electrical control of the D30 laser is achieved via a RJ-45 connector built into
the system. The signals carried on each of the pins are indicated in Table 1.
Details about controlling the laser through the signal interface are discussed in
Laser Operation.
DAVI highly recommends use of shielded interface cables. The interface cable
shield must connect to the chassis ground of the controller. In addition to
proper shielding, this shield provides a secondary connection for the signal
ground (Pin #8).
A floating ground connection (use of un-shielded interface cable or no return
path between the host control electronics and the laser) can present an unsafe
condition and result in unstable or unexpected operation of the laser. This
condition can arise when the control signal ground connection (Pin #8) is lost
and the Control Enable (Pin #7) and RF Enable (Pin #1) remain high.
Therefore, DAWEI strongly recommends that a second safety ground be
provided either via a shielded control cable or common potential chassis
mounting between the laser head and the control electronics.

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Laser Operation
Signal Interface Connectors
For all D30 laser, the signal interface between the D30 laser and the
customer's equipment is through a RJ-45 connector that is built into the RF
power supply. The pin assignments for the interface are indicated in Table 1.
The signal interface and its use are discussed in detail in this section.
Table 1. Signal Interface Description and Connector Pinout
PIN NO.
1
RF Enable
TTL logic input; 1=RF ON, 0=RF OFF; 1 kΩimpedance
This input turns on the laser. See also Pin 7, Control Enable, below
2
+15 VDC ±.5 VDC, .25 Amps Max output for customer use
3
LASER OK
TTL logic output; 1=LASER OK, 0=LASER Fault; I =-0.4 mA, I =8 mA
Output is asserted when no faults (SWR, Temp. Or Volt.) are detected
4
Temperature OK
TTL logic output; 1=Temp OK, 0=Temp Fault; I =-0.4 mA, I =8 mA
Output is asserted when temperature is below maximum value
5
Voltage OK
TTL logic output; 1=Voltage OK, 0=Voltage Fault; I =-0.4 mA, I =8 mA
Output is asserted when DC supply voltage (V) is below max. value
6
Must be connected to GND
7
Control Enable
TTL logic input; 1=Laser Control Enabled, 0=Laser Control Disabled
This input must be asserted before RF enable can used to turn on laser
8
GND
Notes:
1) Connector used is RJ-45 type.
2) These specifications are subject to change.
To avoid damage to the RF power supply, make sure your electronic controller
is compatible with the interface described in Table 1.
As noted in Section Two: Laser Safety, the signal interface is designed to
provide a high degree of reliability in the control of laser on any use of the
signal interface in safety interlock subsystems, or in any other subsystem
which affects personnel safety.
Operating Modes

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All D30 lasers can be operated in continuous wave (CW) mode or Gated CW
mode. Each mode is described in the following sections; details about how to
operate the laser in each mode is also discussed.
In the following sections, the assumption is that the laser has been initially
started so the laser is now ready for operation.
Typical Waveform
Figure 1 illustrates a typical periodic pulsed laser waveform. The RF input to
the laser will generally follow the “RF Enable”signal (Table 1). The laser output
will generally follow the RF input, but will be distorted.
The pulse repetition frequency is PRF =
T
1
T = period of the waveform
The duty cycle is DC = (
T
τ
) 100 τ= the pulse width
CW Mode
To command any D30 laser to operate in CW mode, “RF Enable”must be set
continuously to Logic Level 1 (high).
Pre-lonization
Pre-ionization is a feature of the D30 laser that provides ease of start-up and
improved pulse timing. Upon 48 VDC Power-up the D30 will automatically
begin a pre-ionization pulse sequence.
During the first approximately 40seconds the Laser OK fault Condition will be
assured (Laser OK=false). It is not possible to operate the D30 during this
period. Under normal conditions, after 40 seconds the Laser OK will
automatically return to Laser OK = true and the laser is ready to operate.
Gated CM Mode
The D30 laser can produce a wide range of pulse repetition frequencies
(PRFs), pulse widths, and duty cycles in Gated CW mode. RF Enable pulse
widths of less than 1 µs and/or PRFs greater than 25 kHz are not advisable.
Except for these restrictions on pulse widths and PRFs, the RF power support
any duty cycle from zero to 100% in Gated CW mode.
Figure 1
Variable Output Power Capability; Pulse width Variation
All D30 lasers provide the capability to vary the average laser output

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continuously from near zero to least the CW output power specified in Table
1-1. The user implements this capability by adjusting the pulse width of the
input command “RF Enable Select”.
Optical Pulse Shape
When the pulse width of the input digital signal “RF Enable” Is varied, the Pulse
width of the RF input to the laser's electric discharge is also varied. Because of
the complex dynamics of the electric discharge and the laser resonator, the
optical output from the laser will be a distorted version of the RF input
waveform.
To vary the laser output power, adjust the RF pulse width in Gated CW mode,
with the recommended lower limit on pulse width at 1 µs.
Complex Modulation Waveforms
There are a variety of potentially useful Modulation waveforms in addition to
simple periodic waveforms with a single pulse per period of the waveform
Varying the Pulse width
Some users may require pulsed output with fixed pulse width but variable
pulse energy. It is possible to approximate the desired optical output by pulsing
the laser at a relatively high PRF (e.g.,25 kHz), then envelope-modulating at a
lower PRF (e. g., 1 kHz). Variation of the pulse width of the 25 kHz modulation
would provide the ability to vary the pulse energy of the 1 kHz pulses
continuously.
Protection from Unacceptable Inputs
The D30 laser easily accommodates complex modulation waveforms. The
laser system will protect itself from damage due to inappropriate inputs, even
for such complex input waveforms.
Turning the Laser On and Checking Output Power
The following steps detail the method to turn a D30 laser on and to perform an
output power check.
1. Ensure that the laser output aperture is clear and free of packing material.
2. Place a laser power meter head in a position to intercept the output beam,
and turn on the power meter.
3. Verify that the system does not have condensation on its outer surfaces.
4. If the D30 laser is built into a system with safety interlocks, verify that all
required laser safety interlocks are positioned for laser operation.
5. Verify that other safety features, such as equipment covers, shutters, and
warning lights are functional and operating properly.
6. Verify the solid electrical connection between the negative DC input terminal
on the system and earth ground.
7. Ensure that all safety procedures, such as use of laser safety goggles as
detailed in Section Two: Laser Safety are observed.
8. Turn AC power to the DC power supply on.
9. Turn DC power to the system on.
10. Set the user-supplied control equipment to activate the laser in CW mode,
in accordance with the instructions below.
11. After a few seconds of laser operation, read and verify the power level. The
laser output should meet or exceed the laser output power specification given
in Table 1.
12. Set the user-supplied control equipment to deactivate the laser.
13. Turn DC power off.

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14. Turn AC power off.
Electronic Control
Your D30 laser is controlled through the electronic interface described by Table
1. In this section, additional information is provided about the use of this control
interface.
Use of the control interface in any strategy for assuring personnel safety must
comply with the design guidelines discussed in : Laser Safety.
Electronic Signals Required to Turn the Laser On
The laser can be commanded electronically to turn on any time during which
DC power is applied to the RF power supply and the RF power supply is
connected to the laser head properly. DAVI recommends that all the control
signals be set to their “off” condition until DC power is applier to the RF power
supply.
Start-up Sequence
The following steps detail how to turn the laser on in CW mode.
1. Apply DC power to the laser. Note that this will initiate the pre-ionization
pulse stream and laser will be locked out of operation for approximately 30
seconds. During this time the “LaserOK” fault signal will indicate a fault
condition.
2. Set “Control Enable” (Pin 7) to “TTL high” (logic 1). This enables the RF
power supply by enabling DC power to an internal control board.
3. After the “LaserOK” pulse how returned to a true condition, activate “RM
enable”.
4. Set “RF Enable” to login 1 (pin 1. This activates the RF output of the FR
power supply.
Response Times of Laser to RF Enable and Control Enable
The response time of the RF power supply to “Control Enable” (Pin 7), and to
“RF Enable” (Pin 1) are quite different. The response to “RF Enable” is on a
microsecond time scale, whereas the response to “Control Enable” is on a time
scale of milliseconds.
This difference is not significant if the objective is to use the power supply only
in CW mode. However, if it is desired to use the power supply in Gated CW
mode, it is important to consider the response time of the power supply.
In general, it is best to turn the DC power supply on with “Control Enable” and
leave it on while modulating “RF Enable” as required.
Signals Used for Fault Detection
Several of the signals listed in Table 1 may be used at the customer's
discretion for diagnosing faults the laser system.
The approach that provides the easiest access to these signals is to provide
indicators, such as light-emitting diodes (LEDs), on the customer's system
control console for three of these signals. One way to use these signals is to
sink the current for one LED on the operator's control panel with each of the
following three Signal leads:

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Figure 2. Fault Detection Circuit
Laser OK (pin 3): This signal indicates a composites fault if either over
temperature, or voltage are at fault. The LaserOK will indicate a fault condition
on power up of the 48VDC supply for a period of approximately 30 seconds.
Temperature OK(pin 4): This signal indicates an over temperature fault, This
will trip at a laser head temperature Of approximately 65℃.
Voltage OK (pin5): This signal will indicate a fault if
DD
V
Exceeds 55 VDC.

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Maintenance and Troubleshooting
The D30 laser requires no routine maintenance. However, the air-cooling
system may require maintenance, as described below.
Air Cooling system maintenance
Ambient air cleanliness must be maintained for fans and heat sinks to operate
properly. Cooling efficiency will degrade if the fans and heat sinks accumulate
dust and dirt particles. The user must clean and vacuum any dust and dirt
particles from the heat sinks and fans approximately every six months, or as
needs.
Cleanliness of Output Optical Element
The laser head must never be activated if the output optical element is
contaminated by water, dust, or any contaminant. Operation of the laser head
with any contaminant on the surface of that optical element may result in
damage to the coating. If any contamination is present, the laser must be
returned to DAVI so the problem can be corrected. The customer’s system
design should also be reviewed to prevent a recurrence of the contamination
problem.
Troubleshooting
DAVI recommends that the following checks be performed before calling for
service.
DC power and voltage
Verify that DC power is available to the RF power supply. Verify that the
voltage on Pin 2 of the signal interface connector is (+15±0.5) VDC, as shown
in Table 1.
If the voltage is not within the specified range, the RF power supply is faulty
and the laser must be returned to DAVI.
Over Temperature shutdown
If the fault detection signal named “Temperature OK”(Pin 4 in Table 1,”signal
Interface Description and Connector Pinout”) is active, troubleshoot the cooling
system to determine why the RF power supply appears to be overheating.
Control Inputs
Verify that the control inputs at the interface connector are set to appropriate
values in accordance with Table 1, “Signal Interface Description and Connector

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pinout,”on page 15.
The fault detection signals form the RF power supply are discussed in the
section titled “Signals Used for Fault Detection”on page 4-6.
CW Mode
If the laser output is non-zero, measure the laser output power in CW mode
and compare it to the output power specified for your laser model in Table 1-2
on page 5.
The signal inputs required to place the laser in CW mode are discussed in the
section titled “CW Mode” on page 16.
Control Inputs
Verify that the control inputs at the interface connector are set to appropriate
values in accordance with Table 1, “Signal Interface Description and Connector
Pinout,” on page 15.
The fault detection signals from the RF power supply are discussed in the
section “Signals Used Fault Detection” on page 4-6.
Over-Temperature Shutdown
The D30 comes equipped with a temperature fault sensor. This sensor is
located inside the RF supply module in the vicinity of the RF power amplifier.
This sensor detects an over-temperature condition when this RF amplifier is
approximately 100℃. Under normal conditions (fans operating with free air
flow), this corresponds to a case temperature of approximately 85℃.
Determine why the over-temperature fault is activating and correct this
problem. The laser will not be damaged by an over-temperature.
If the fault detection signal “Temperature OK” (Pin 4 in Table 1 on page 4-1) is
active, the temperature of the laser has exceeded 90℃. Troubleshoot the
cooling system to determine why the laser appears to be overheating.
CW Mode
If the laser output is non-zero, measure the laser output power in CW Mode
and compare it to the output power specified for your laser model in Table 1-2
on page 5.
The signal inputs required to place the laser in CW mode are discussed in the
section titled “CW Mode” on page 16.
Visualizing
If the laser output is non-zero and you have access to visually inspect the
spatial structure of the output beam, perform such a visualization and record
the results.
If there is evidence that the spatial quality (Transverse Mode quality) of the
output beam is degraded, examine the output optical element of the laser head,
looking for evidence of damage to the optical coating. (This examination must
be performed with AC power to the laser system disconnected.)
If any coating damage is present, the laser must be returned to DAVI to be
corrected by DAVI technicians.
The customer's system design should also be reviewed to determine if
contamination to the optical element could have Contributed to the coating
damage. If, after performing the above checks, there is a problem with the
laser, proceed to Section B, “D”Series Laser Warranty.