DA3N
D/A CONVERTER
Owner's Manual
POWER INPUT HEADPHONE
DIGITAL TO ANALOG CONVERTER DA3N
OPT1
USB1 VOLUME
USB SOUND SYSTEM
D/A CONVERTER DA3N
2
●Introduction ………………………………………………………………… 2
●Features ……………………………………………………………………… 2
●Important Safety Instructions ……………………………………………… 3
●Handling Precautions ……………………………………………………… 6
●Accessories …………………………………………………………………… 7
●Front Panel Functions ……………………………………………………… 8
●Digital Filter ……………………………………………………………… 10
●"SuperLink" Digital Signal Transmission System …………………… 11
●Rear Panel Functions …………………………………………………… 12
●How to connect …………………………………………………………… 13
●Remote Control Unit ……………………………………………………… 17
●Operation …………………………………………………………………… 18
●Maintenance ………………………………………………………………… 20
●Troubleshooting …………………………………………………………… 21
●Service Contact Preparation ……………………………………………… 22
●Specications ……………………………………………………………… 23
Contents
Thank you for purchasing a DA3N.
Please read through and refer to this Owner's Manual to use your
DA3N safely and adequately. It is recommended that you keep the
unit's packaging available for future transportation needs.
Introduction
Features
●DA3N is a top-grade digital to analogue converter, which precisely
converts the digital signal to the analogue signal and transports the
converted signal to the amplifier without distortion.
●DA3N works perfectly with 5 kinds of digital sources. AES/EBU, COAX.,
TOSLINK and USB in addition to CEC original SUPERLINK.
●For SUPERLINK the BNC 4-cables connection is available in addition to
the traditional D-sub 9 pin connection. Performance at SUPERLINK may
improve when an external high-precision master clock is supplied.
●DA3N is equipped with a DAC chip, ES9008, which performs up to 24bit/
192kHz music signal.
●The digital filter is switchable between standard FLAT and ringing-free
PULSE.
●Balanced circuit design achieves the high quality signal path keeping the
sound quality very natural and clear.
●Both Fixed and Variable outputs provide balanced XLR and unbalanced
RCA connections.
DA3N User's Manual
3
Important Safety Instructions
The exclamation point within an equilateral triangle is
intended to notify the user to the presence of important
operating and maintenance (servicing) instructions in the
accompanying documentation.
The lightning flash with arrowhead symbol, within an
equilateral triangle, is intended to alertthe user to potential
electric shock hazards within the product’s enclosure.
CAUTION
RISK OF ELECTRIC SHOCK!
DO NOT OPEN!
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE THE COVER OR REAR PANEL. IT DOES
NOT CONTAIN ANY USER-SERVICEABLE PARTS. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT
EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use the DA3N near water.
6) Clean only with a dry cloth.
7) Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8) Do not install the DA3N near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including ampliers) that produce heat.
9) (For USA, Canada: ) Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades, with one blade wider
than the other. A grounding type plug has two blades and a third grounding
prong. The wide blade or the third prong is provided for your safety. If the
D/A CONVERTER DA3N
4
provided plug does not t your outlet, consult an electrician for replacement
of the obsolete outlet. (For European Countries: ) Do not defeat the safety
purpose of the grounding-type plug. This plug has two poles and a third
grounding hole. The third hole is provided for your safety. If the provided plug
does not t your outlet, consult an electrician for replacement of the obsolete
outlet.
10) Protect the DA3N’s power cord from being walked on or pinched,
especially around the plugs, convenience receptacles, and where it exits the
DA3N’s casing.
11) Only use attachments/accessories specied by the manufacturer.
12) Only use the DA3N with a cart, stand, tripod,
bracket, or table specied by the manufacturer or sold
with the unit. If using a cart, exercise caution when
moving the cart/ unit combination to avoid injury from it
tipping over.
13) Unplug the DA3N during lightning storms or when leaving it unused for
extended periods of time.
14) Refer all servicing to qualified service personnel. Servicing is required
when the DA3N itself, its power-supply cord, or plug has been damaged
in any way, when liquids have been spilled onto the DA3N, when foreign
objects have fallen into the DA3N, when the DA3N has been exposed to rain
or moisture, when the DA3N does not operate normally, or when the DA3N
has been dropped.
CAUTION:
● DO NOT EXPOSE THE DA3N TO DRIPS OR SPLASHES.
● DO NOT PLACE ANY OBJECTS FILLED WITH LIQUIDS, SUCH AS
VASES, ON THE DA3N.
● DO NOT INSTALL THE DA3N IN A CONFINED SPACE, SUCH AS WITHIN
A BOOKCASE OR SIMILAR PIECE OF FURNITURE.
● PLUG THE AC POWER CORD INTO AN EASILY ACCESSIBLE AC
WALL OUTLET, SO IT CAN BE QUICKLY UNPLUGGED IN CASE OF
EMERGENCY.
● DO NOT REMOVE THE PROTECTIVE HOUSING WITH A
SCREWDRIVER.
● USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF
DA3N User's Manual
5
PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.
● IF THE DA3N SEEMS TO BE MALFUNCTIONING, CONTACT
A QUALIFIED SERVICE STATION. DISCONTINUE USE OF ANY
MALFUCTIONING UNIT.
Handling Precautions
❶Connecting Other Devices
Unplug the DA3N’s AC power cord from the outlet before connecting or
disconnecting other devices. Exercise caution when handling the AC
power cord. When disconnecting the AC cord from a socket, make sure
you pull the plug, and not the cord itself.
❷Turning Power On/Off
Your system components should be turned on/off in the following order to
avoid generating noise from your speakers and damaging the speakers
themselves or other devices:
Turning power on: Turn on the DA3N’s power rst, before turning on the
amplier connected to the DA3N.
Turning power off: Turn off the amplier’s power rst, before turning off the
DA3N.
❸Handle With Care
Avoid exerting excessive force on the cabinet, the switch and the knob on
the DA3N.
❹Installation
Use of an audio rack is recommended to maximize the sound quality
and performance of the DA3N. Installation and use of the DA3N in the
locations described below may cause deterioration in sound quality or
malfunction:
● Locations exposed to direct sunlight, such as windowsills, and
AC POWER CORD CONNECTION
CAUTION:
TO PREVENT ELECTRIC SHOCK, MATCH THE BLADE WIDTH
OF THE PLUG TO THE SLOT WIDTH. THE PLUG MUST BE
FULLY INSERTED TO THE SLOT.
For CANADA
D/A CONVERTER DA3N
6
other exceptionally warm locations, such as near heating appliances
(surrounding temperature higher than 35 °C), or exceptionally cold
locations (surrounding temperature lower than 10 °C), may prevent the
DA3N from functioning adequately.
● Damp locations exceeding 90% humidity may cause the DA3N’s
metal parts to rust, causing the unit to malfunction.
● Dusty locations may cause the DA3N to malfunction. The
accumulation of dust inside the CD door may lower the performance of
music signal reading. It may also cause contact failure of the switches,
and/or noise.
● Otherwise, avoid installing the DA3N close to other transformers and
electrical motors, so as to prevent the pickup of induction hum. Also,
avoid mounting the unit on surfaces that may be affected by vibration.
❺Avoid lightning strikes
Disconnect the AC power cord from the AC outlet when there is a
thunderstorm in your vicinity.
❻Condensation
When the DA3N is brought into a warm room when the exterior
temperature is cold, or when the room temperature rises sharply from
using a heater, condensation may form both inside and outside the unit,
hampering its performance. If this happens, leave the DA3N unused in
the room for 1 to 2 hours (depending on the amount of condensation),
so as to bring the unit’s temperature closer to the room temperature. The
condensation should go away gradually.
❼Listening etiquette
When adjusting the sound volume level, make sure you do not disturb
other people and your neighborhood.
DA3N User's Manual
7
Accessories
DA3N should contain the following:
❶DA3N unit
❷BNC Cable x 4
❸AC Power Cord
❹Remote Control unit
❺Two AAA batteries for the remote control unit
❻Owner's Manual
NOTE: Keep the packaging available for future transportation needs.
The AC power cord is for use with the DA3N exclusively, and should not be
used for other devices.
DA3N
取扱説明書
❷
❺
❻
❸
❹
❶
DA CONVERTER
DA3N
1010
DA3N
DA CONVERTER
CEC CO., LTD.
MADE IN JAPAN
POWER INPUT HEADPHONE
DIGITAL TO ANALOG CONVERTER DA3N
OPT1
USB1 VOLUME
USB SOUND SYSTEM
D/A CONVERTER
D/A CONVERTER DA3N
8
Front Panel Functions
❶POWER Button
Press the POWER button to turn the power ON or OFF. The switch
will light up in blue color when power is ON and "WAIT" is displayed.
Approximately 6 seconds later the display will change to indicate the
selected input, sampling frequency and options.
❷OPT1 Input
Connect to any digital audio device using an optical fiber cable with a
mini round plug. This input supports sampling frequencies from 32kHz to
96kHz.
❸USB1 Input
Connect to a computer using a USB cable with a mini B plug. This input
supports sampling frequencies from 32kHz to 96kHz but not 88.2kHz
which is automatically upsampled to 96kHz.
❹INPUT Selector Knob
Turn the INPUT knob clockwise or counterclockwise to select a digital
input SL1(SUPERLINK / BNC), SL2(SUPERLINK / D-SUB), USB1(mini
B type on front), USB2(B type), OPT1(optical mini round connector),
OPT2(TOSLINK), OPT3(TOSLINK), AES(AES/EBU) or COAX(COAXIAL).
The selected input is displayed
at Ⓐand the display shows the
sampling frequency at Ⓑ once
DA3N detects the digital input signal.
Note: Whenever changing the input "Unlock" is displayed in a flash before
SL1 SL2 USB1 USB2
OPT1
OPT2
OPT3AES
COAX
POWER INPUT HEADPHONE
DIGITAL TO ANALOG CONVERTER DA3N
OPT1
USB1 VOLUME
USB SOUND SYSTEM
❶
❷
❹
❸❼
❻❺ ❽
DA3N User's Manual
9
the sampling frequency is displayed.
Note: Due to the input signal quality DA3N sometimes can not lock the
signal properly resulting in having a noise in the music. In that case select
the input again to reset the locking.
Note: Whenever changing the input to or from the SUPERLINK the
master clock source is also switched to external or internal to cause the
CD Transport to stop the playback. Push the CD play button again to
resume the playback.
When changing the input, set the volume to lower level to avoid
speaker damage! Each input signal varies the sound level and it
might amplify the small noise to the big one.
❺DISPLAY
ⒶThe selected digital input is displayed.
ⒷThe selected input sampling frequency is displayed.
When no or incompatible signal is there "Unlock" or "Unknown"(at USB)
is displayed.
When the volume knob is turned the level is displayed for 6 seconds.
ⒸThe selected digital filter type is displayed.
"P" is displayed when "PULSE" is selected or "F" for "FLAT". You may
change the digital filter by remote control. Refer to page 10 about the
digital filter function.
ⒹAn external master clock input is displayed.
"M" is displayed when a SUPERLINK is selected and an external master
clock 44.1kHz is connected. The same external master clock is supplied
to the CD Transport via DA3N.
❻REMOTE Sensor
The remote sensor, which receives signals from the remote control unit, is
located at the right side of display. Address the remote control unit to the
sensor correctly. The remote control unit may malfunction if there should
be any obstacles between the remote control unit and the remote sensor.
❼VOLUME Knob
The volume at headphone output and Variable output level can be
D/A CONVERTER DA3N
10
Push the DF button on the remote control to select a digital filter FLAT or
PULSE.
●The FLAT digital Filter is very common in digital audio items. The
frequency response is almost perfect, but such filter cause "ringing" in the
time domain. Some energy of a pulse signal is distributed in the time domain,
before and after the pulse centre. Any ringing before the signal does not exist
in nature.
●The PULSE filter avoids the problems in the time domain and thus has
a very good response in the time domain. The frequency response of the
PULSE digital filter shows a soft roll-off at high frequencies. This results in
about -2dB at 20kHz with an input sampling frequency of 44.1kHz. For higher
sampling frequencies the roll-off is irrelevant and the "PULSE" filter is the
best choice. For 44.1kHz and 48kHz the better result may depend on the
whole system as well as personal preferences.
Digital Filter
adjusted. Turn counterclockwise to minimize the volume to see VOL
MUTE. Turn clockwise to see -90dB, -80dB, -72dB by each step. After
-72dB one step goes by 6dB up to -54dB, and up to -42dB by 3dB. After
-42dB volume will be increased by 1dB at one step.
Note: VOLUME woks both headphone and Variable outputs. Unused
one should be switched off or disconnected.
❽HEADPHONE Jack
Headphone output jack for standard 6.3 mm plug.
Note: For using a headphone with 3.5mm mini plug, purchase a 6.3mm
conversion plug from a dealer.
Before using your headphones for listening, turn the volume
to the minimum and insert the headphones plug into the jack.
Excessive sound pressure from the headphones may cause
hearing loss to your ears.
VOL MUTE
-90dB -80dB -72dB -54dB
-42dB
0dB
DA3N User's Manual
11
FLAT PULSE
"SUPERLINK" Digital Signal Transmission System
SUPERLINK is CEC’s proprietary digital signal transmission system that
transports music signals and synchronization(clock) signals with separate
cables. The SPDIF(Sony Philips Digital Inter Face) and AES/EBU(Audio
Engineering Society/European Broadcasting Union) systems, commonly
used in coaxial digital outputs and optical outputs, transmit both the music
and clock signals through the same cable, and thus are prone to jitter effects
caused by the signals interfering with each other. CEC’s SUPERLINK
system transmits these signals separately with multiple cables, requiring no
encoding/decoding process for data transmission. It minimizes deterioration
of the music signal during transmission by using the clock signals from the
D/A converter’s master clock generator to achieve complete synchronization.
Each transmission path delivers/receives the following signals.
MCK(Master Clock): The CD transport receives the master clock signal
from the D/A converter through this line, and functions as a slave to the
DA converter, enabling completely synchronized transportation of audio
data.
BCK(Bit Clock): Sends bitclock signals, required for digital data bit
identification(e.g. sampling frequency) or signal readout, from the CD
transport to the D/A converter.
LRCK(L/R Clock): Sends left/right identication clock signals from the CD
transport to the D/A converter.
DATA: Sends audio data from the CD transport to the DA converter.
D/A CONVERTER DA3N
12
Rear Panel Functions
●VARIABLE Analog outputs
You may adjust the analog output level of DA3N by turning the VOLUME
knob. You may connect your loud speaker system with amplier or power
amplier to VARIABLE output; DA3N works as pre-amplier.
Note: VOLUME woks both Variable and headphone outputs. It is
recommended that unused headphones should be disconnected.
❶RCA(Unbalanced)
Standard RCA analogue signal output terminals for connecting a power
amplier.
❷XLR（Balanced）
Balanced analogue output using standard XLR terminals (1=GND,
2=Hot, 3=Cold). This should be the preferred connection since DA3N
has been designed at fully balanced circuit.
●FIXED Analog outputs
Connect to a pre-amplifier or amplifer with the volume control function.
❸RCA(Unbalanced)
Standard RCA analogue signal output terminals for connecting amplier
with the volume function.
❹XLR（Balanced）
Balanced analogue output using standard XLR terminals (1=GND,
2=Hot, 3=Cold). This should be the preferred connection since DA3N
has been designed at fully balanced circuit.
●Digital Inputs
❺COAX
Connect to any digital audio device using a 75Ω coaxial cable. This
input supports sampling frequencies from 32kHz to 192kHz.
❶
❷❹
❸
❼
❻
❺
❽❾
❿
DA3N User's Manual
13
❻❼ OPT2/OPT3
Connect to any digital audio device using an optical ber cable with a
TOSLINK connector. This input supports sampling frequencies from
32kHz to 96kHz.
❽AES/EBU
Connect to any digital audio device using a 110Ω balanced XLR cable
(1=GND, 2=Hot, 3=Cold). This input supports sampling frequencies from
32kHz to 192kHz.
❾USB2
Connect to a computer using a USB cable with a B plug. This input
supports sampling frequencies from 32kHz to 96kHz but not 88.2kHz
which is automatically upsampled to 96kHz.
❿MCK 44.1kHz
44.1kHz master clock input jack with a BNC connector. Connect to an
external clock generator using a BNC (75Ω) cable. When the external
master clock is supplied "M" is displayed. When DA3N is connected with
a CD transport via SUPERLINK ( SL1 or SL2), the CD transport is
under the same master clock control.
Note: External master clock does not work at the other connections than
SUPERLINK.
SL1(SUPERLINK BNC)
CEC’s proprietary SUPERLINK interconnection via BNC cables. There
are four terminals: DATA, LRCK, MCK and BCK which should be
connected accordingly via 75Ω coaxial BNC cables supplied with DA3N.
You may connect with CEC TL1N and TL3N. When the other BNC
cables are used, make sure to select high quality BNC cables with 75Ω.
Sampling frequency is xed at 44.1kHz.
SL2(SUPERLINK D-SUB)
CEC’s proprietary SUPERLINK interconnection via D-Sub-9pin cable.
Connect a CD transport equipped with a D-Sub-9 pin SUPERLINK
output like TL51 series.
Note: Common D-Sub-9pin cable at computer world cannot be
recommended. You may consult with your dealer for CEC recommended
cable.
AC LINE
Connect the AC power cord supplied with DA3N.
D/A CONVERTER DA3N
14
●SUPERLINK Connection / BNC
75Ω BNC cables are supplied with DA3N.
Connect DA3N’s SUPERLINK terminals to the same marked terminals on
the CD Transport (TL1N or TL3N) with 75Ω BNC cables.
（DATA ⇔DATA, BCK ⇔BCK, LRCK ⇔LRCK, MCK ⇔MCK）
●SUPERLINK Connection / D-SUB-9
Connect DA3N's SUPERLINK D-Sub terminal to a compatible CD-
Transport (i.e. TL51X). This is the older SUPERLINK standard. Note that
this connection is very sensitive to cable tolerances. You may ask your
dealer for the CEC original D-Sub-9 cable, which provides better results.
●MCK 44.1kHz(Master Clock) Connection
Connect an external clock generator using a 75Ω BNC cable.
When SUPERLINK works, the external clock is activated.
How to connect
Clock Generator
DA3N User's Manual
15
●USB Connection
Connect USB mini B or USB B plug to the DA3N’s USB terminal on front
or rear panel. This way DA3N can be used as an external computer sound
system. After connecting DA3N is automatically registered to the operating
system as CEC DA3N USB1 or USB2, but you may have to set your
computer to route the sound signals to DA3N instead of the internal sound
system. DA3N works with Windows 7, Vista, XP, Mac OSX and Linux. In
case of special operating system setups without automatic USB scanning
or limited user rights, you may ask your system administrator.
Manual setting in your computer
・Windows: Go to CONTROL PANEL. Select AUDIO out of SOUNDS
& AUDIO DEVICES. Select CEC DA3N USB1 or USB2 out of SOUND
REPRODUCTION.
・Macintosh: Select SOUND at system environmental set-up. Select CEC
DA3N USB1 or USB2 out of OUTPUT button.
●AES/EBU Connection
Connect to the AES/EBU terminal of any compatible digital audio device
with a 110Ω XLR cable.
POWER INPUT HEADPHONE
DIGITAL TO ANALOG CONVERTER DA3N
OPT1
USB1 VOLUME
USB SOUND SYSTEM
D/A CONVERTER DA3N
16
●COAXIAL Connection
Connect to the COAXIAL terminal of any compatible digital audio device
with a 75Ω COAXIAL (RCA) cable. If COAXIAL cable has an arrow mark,
connect to DA3N at the direction of mark.
●Optical Connection
TOSLINK optical fiber cable (round shaped mini-plug or squared shaped
standard type)
Connect to the TOSLINK terminal of any compatible digital audio device
with an optical cable.
Warning: LED light is used at optical cable. Do not try to directly watch
the light out of the cable in order not to harm your eyes.
Note: TOSLINK is using an optical fiber. Do not bend the cable too much
and keep unused TOSLINK terminals covered.
POWER INPUT HEADPHONE
DIGITAL TO ANALOG CONVERTER DA3N
OPT1
USB1 VOLUME
USB SOUND SYSTEM
DA3N User's Manual
17
Remote Control Unit
●Buttons function
❶to buttons can be used for DA3N and the other buttons for CD
Transport TL3N.
❶VOL-UP Button
Press to increase the volume.
❷VOL-DN Button
Press to decrease the volume.
❸OPT1 Button
Press to select the optical input with round mini terminal on the
front panel.
❹OPT2 Button
Press to select the optical input with squared TOS Link terminal.
❺OPT3 Button
Press to select the optical input with squared TOS Link terminal.
❻AES/EBU Button
Press to select the AES/EBU input.
❼COAX Button
Press to select the Coaxial input.
❽SL1 Button
Press to select the SUPERLINK input with BNC terminals
❾SL2 Button
Press to select the SUPERLINK input with D-SUB 9 terminal.
❿USB1 Button
Press to select the USB mini B input on the front panel.
USB2 Button
Press to select the USB B input.
DF Button
Press to select a digital lter FLAT or PULSE.
Lower the volume before changing the input to avoid changing
noise, sudden big sound, or headphone / speaker damage!
●Precautions on Using the Remote Control Unit
❶When operating the remote control, point it towards the remote sensor
on the DA3N’s front panel. Make sure nothing is blocking the front panel
where the remote sensor is located.
❷Avoid exposing the remote sensor on the front panel to direct sunlight or
other light sources, as such exposure can cause malfunction.
❸The remote control unit may malfunction when its batteries are running
❶
❷
❸
❹
❽
❺
❼ ❾
❿
❻
D/A CONVERTER DA3N
18
low. Change the batteries to new ones of the same type if this seems to be
the case.
●Battery Installation
Remove the cover of the battery compartment.
Insert the supplied two AAA batteries into the
compartment. Make sure that the batteries are
inserted with their positive (+) and negative (-)
poles positioned correctly, and put the cover
back on.
●Battery Replacement
If the distance at which the remote control unit can be used to operate the
DA3N seems to be decreasing, replace both batteries with new ones.
●Battery Precautions
❶Never use different types of batteries together. Both rechargeable and
non-rechargeable batteries can be used, but the two should not be used
together.
❷If you will not be using the remote control unit for an extended period of
time (more than a month), remove the batteries to prevent leakage.
❸If the batteries leak, use a cloth to wipe away the liquid inside the
battery compartment and replace the batteries with new ones.
❹Do not heat or disassemble batteries, and never dispose of old batteries
by throwing them in a re. Dispose of batteries following laws in the local
area
Operation
●Basic Operation
❶Power on DA3N and CD transport or computer connected to the DA3N.
"WAIT" is displayed and about 6 seconds later current functions are
displayed then DA3N can be operated.
❷After the volume is minimized on DA3N or amplifier, power on the
amplier.
❸Turn the INPUT selector or press the remote button to select an input
out of the connected terminals.
The selected input is displayed at Ⓐ. If no connected input is selected
"Unlock" or "Unknown" (USB) is displayed at Ⓑ.
DA3N User's Manual
19
When the input signal is detected the sampling frequency is displayed at Ⓑ.
❹After the sampling frequency is displayed, start the playback of the
selected digital audio device.
❺Increse the volume.
❻Select a digital lter FLAT or PULSE. FLAT features liner frequency up
to 20kHz. When selecting FLAT "F" is displayed at Ⓒ. PULSE features soft
treble roll off and ringing free playback resulting in wider sound stage and
dynamic sound. During PULSE "P" is displayed.
●SUPERLINK（BNC or D-SUB 9) Operation
❼When CD transport is connected with DA3N via SUPERLINK, external
44.1kHz master clock can be used. When the master clock is linked, "M" is
displayed at Ⓓ.
Note: An external master clock works with DA3N only when SUPERLINK
is used.
D/A CONVERTER DA3N
20
Maintenance
●If the surface of the DA3N case becomes soiled, wipe with a soft cloth or
use diluted neutral cleaning liquid. Be sure to remove any uid completely.
Do not use thinner, benzene, alcohol, chemical cloths or bleaching agents as
these may damage the surface of the DA3N case. Also avoid using aerosol
insecticides near the unit.
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