Scientific Atlanta Explorer 4250HD User manual

User Guide
Explorer 4250HD Home Gateway

Notice to Installers
The servicing instructions in this notice are for use by qualified service personnel only. To reduce the risk of electric shock, do not
perform any servicing other than that contained in the operating instructions, unless you are qualified to do so.
Note to System Installer
For this apparatus, the coaxial cable shield/
screen shall be grounded as close as practical
to the point of entry of the cable into the building.
For products sold in the US and Canada, this
reminder is provided to call the system installer's
attention to Article 820-93 and Article 820-100 of
the NEC (or Canadian Electrical Code Part 1),
which provides guidelines for proper grounding
of the coaxial cable shield.
CAUTION: To reduce the risk of electric
shock, do not remove cover (or back).
No user-serviceable parts inside. Refer
servicing to qualified service personnel.
This symbol is intended to alert you of
the presence of important operating and
maintenance (servicing) instructions in
the literature accompanying this product.
This symbol is intended to alert you that
uninsulated voltage within this product may
have sufficient magnitude to cause electric shock.
Therefore, it is dangerous to make any kind of
contact with any inside part of this product.
WARNING
TO PREVENT FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS UNIT TO RAIN OR
MOISTURE.
20070112 SysInstaller 820 English

1
Contents
Important Safety Instructions.................................................................................................................................2
Welcome to the Explorer 4250HD.....................................................................................................................4
Safety First..............................................................................................................................................................................4
Explorer 4250HD Home Gateway Serial Number................................................................................4
Front Panel Features .....................................................................................................................................................5
Back Panel Connectors...............................................................................................................................................6
Connecting the 4250HD.............................................................................................................................................7
Connections for a HDTV and VCR.....................................................................................................................8
Connections for a Standard-Definition TV and VCR ..................................................................... 10
Performance Tips......................................................................................................................................................... 11
Automatic Software Updates............................................................................................................................. 11
Watching TV...................................................................................................................................................................... 12
Connection Diagrams............................................................................................................................................... 13
Frequently Asked Questions About HDTV and Digital TV ........................................................ 19
Picture Formats.............................................................................................................................................................. 20
Compliance Information......................................................................................................................................... 21

2
IMPORTANT SAFETY INSTRUCTIONS
Read These Instructions
Keep These Instructions
Heed All Warnings
Follow All Instructions
Power Source Warning
A label on this product indicates the correct power source
for this product. Operate this product only from an electrical
outlet with the voltage and frequency indicated on the product
label. If you are uncertain of the type of power supply to your
home or business, consult your service provider or your local
power company.
The AC inlet on the unit must remain accessible and operable
at all times.
Ground the Product
WARNING: Avoid electric shock and fire
hazard! Do not defeat the safety purpose of the
polarized or grounding-type plug. A polarized plug
has two blades with one 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 provided plug does
not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
If this product connects to coaxial cable wiring, be sure the
cable system is grounded (earthed). Grounding provides some
protection against voltage surges and built-up static charges.
Outdoor Grounding System
If this product connects to an outdoor antenna or cable system,
be sure the antenna or cable system is grounded (earthed).
This provides some protection against voltage surges and
built-up static charges.
Article 810 of the National Electric Code (NEC) ANSI/NFPA
No. 70-1990, provides the following information:
• Grounding of the mast and supporting structure
• Grounding the lead-in wire to an antenna discharge unit
• Size of the grounding conductors
• Location of the antenna-discharge unit
• Connection to grounding electrodes
• Requirements for the grounding electrodes (see the
following antenna grounding diagram as recommended
by NEC ANSI/NFPA 70)
WARNING: Avoid electric shock and fire
hazard! Do not locate an outside antenna system in
the vicinity of overhead power lines or power circuits.
Touching power lines or circuits might be fatal.
Protect the Product from Lightning
For added protection, unplug this apparatus during lightning
storms or when unused for long periods of time. In addition to
disconnecting the AC power from the wall outlet, disconnect
the signal inputs.
Verify the Power Source from the On/Off
Power Light
When the on/off power light is not illuminated, the apparatus
may still be connected to the power source. The light goes
out when the apparatus is turned off, regardless of whether it
is still plugged into an AC power source.
Eliminate AC Mains Overloads
WARNING: Avoid electric shock and fire
hazard! Do not overload AC mains, outlets, extension
cords, or integral convenience receptacles. For
products that require battery power or other power
sources to operate them, refer to the operating
instructions for those products.

3
IMPORTANT SAFETY INSTRUCTIONS,continued
Prevent Power Cord Damage
Protect the power cord from being walked on or pinched,
particularly at plugs, convenience receptacles, and the point
where the cord exits from the apparatus.
Provide Ventilation and Select a Location
• Do not block any ventilation openings. Install in accordance
with the manufacturer’s instructions.
• Do not place this apparatus on a bed, sofa, rug, or similar
surface.
• Do not place this apparatus on an unstable surface.
• Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers)
that produce heat.
• Do not install this apparatus in an enclosure, such as a
bookcase or rack, unless the installation provides proper
ventilation.
• Do not place entertainment devices (such as VCRs or DVDs),
lamps, books, vases with liquids, or other objects on top of
this product.
Protect from Exposure to Moisture and
Foreign Objects
Do not use this apparatus near water.
WARNING: Avoid electric shock and fire
hazard! Do not expose this product to liquids, rain,
or moisture.
WARNING: Avoid electric shock and fire
hazard! Unplug this product before cleaning. Clean
only with a dry cloth. Do not use a liquid cleaner or
an aerosol cleaner. Do not use a magnetic/static
cleaning device (dust remover) to clean this
product.
WARNING: Avoid electric shock and fire
hazard! Never push objects through the openings
in this product. Foreign objects can cause electrical
shorts that can result in electric shock or fire.
Accessories Warning
WARNING: Avoid electric shock and fire
hazard! Only use attachments/accessories speci-
fied by your service provider or the manufacturer.
Service Warnings
WARNING: Avoid electric shock! Do not open
the cover of this product. Opening or removing the
cover may expose you to dangerous voltages. If
you open the cover, your warranty will be void. This
product contains no user-serviceable parts. Refer all
servicing to qualified service personnel.
Servicing is required when the apparatus has been damaged
in any way, such as a power-supply cord or plug is damaged,
liquid has been spilled or objects have fallen into the apparatus,
the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
Check Product Safety
Upon completion of any service or repairs to this product, the
service technician must perform safety checks to determine
that this product is in proper operating condition.
Protect the Product when Moving It
Always disconnect the power source when moving the
apparatus or connecting or disconnecting cables.
WARNING: Avoid personal injury and
damage to this product! Use only with
the cart, stand, tripod, bracket, or
table specified by the manufacturer
or sold with the apparatus. When a
cart is used, use caution when moving
the cart / apparatus combination to
avoid injury from tip-over.
20070802 Set-Top Cable US & Canada