User manual
v ARK-3390 User Manual
Safety Instructions
1. Please read these safety instructions carefully.
2. Please keep this User’s Manual for later reference.
3. Please disconnect this equipment from AC outlet before cleaning. Use a damp 
cloth. Don’t use liquid or sprayed detergent for cleaning. Use moisture sheet or 
clothe for cleaning.
4. For pluggable equipment, the socket-outlet shall near the equipment and shall 
be easily accessible.
5. Please keep this equipment from humidity.
6. Lay this equipment on a reliable surface when install. A drop or fall could cause 
injury.
7. Do not leave this equipment in an uncontrolled environment; storage tempera-
tures above 60°C may damage the equipment.
8. The openings on the enclosure are for air convection hence protecting the 
equipment from overheating. DO NOT COVER THE OPENINGS.
9. Make sure the voltage of the power source when connecting the equipment to 
the power outlet.
10. Place the power cord such a way that people cannot step on it. Do not place 
anything over the power cord. The power cord must be rated for the product and 
for the voltage and current marked on the product’s electrical ratings label. The 
voltage and current rating of the cord should be greater than the voltage and 
current rating marked on the product.
11. All cautions and warnings on the equipment should be noted.
12. If the equipment is not used for long time, disconnect the equipment from mains 
to avoid being damaged by transient over-voltage.
13. Never pour any liquid into ventilation openings; this could cause fire or electrical 
shock.
14. Never open the equipment. For safety reasons, only qualified service personnel 
should open the equipment.
15. If one of the following situations arise, get the equipment checked by service 
personnel:
a. The Power cord or plug is damaged.
b. Liquid has penetrated the equipment.
c. The equipment has been exposed to moisture.
d. The equipment has not worked well or you can not get it work according to
user’s manual.
e. The equipment has been dropped and damaged.
f. The equipment has obvious signs of breakage
Warning! THIS COMPUTER IS PROVIDED WITH A BATTERY-POWERED 
REAL-TIME CLOCK CIRCUIT. THERE IS A DANGER OF EXPLOSION 
IF BATTERY IS INCORRECTLY REPLACED. REPLACE ONLY WITH 
SAME OR EQUIVLENT TYPE RECOMMENDED BY THE MANUFAC-
TURE. DISCARD USED BATTERIES ACCORDING TO THE MANU-
FACTURER’S INSTRUCTIONS.










