The causes of interference, Interference, Diathermy – Curtis TV2010 User Manual

Page 4: Snow, Ghost, Car ignition

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18. SERVICING

Do not attempt to service this unit yourself as opening or
removing covers may expose you to dangerous voltage or
other hazards. Refer all servicing to qualified service
personnel.

19. DAMAGE REQUIRING SERVICE

Unplug this unit from the wall outlet and refer servicing to
qualified service personnel under the following conditions:

a) When the power-supply cord or plug is damaged.
b) If liquid has been spilled, or objects have fallen

into the unit.

c) If the unit has been exposed to rain or water.
d) If the unit does not operate normally by following

the operating instructions. Adjust only those
controls that are covered by the operating
instructions, as an improper adjustment of other
controls may result in damage and will often
require extensive work by a qualified technician to
restore the unit to its normal operation.

e) If the unit has been dropped or the cabinet has

been damaged.

f) When the unit exhibits a distinct change in

performance, this indicates a need for service.

20. REPLACEMENT PARTS

When replacement parts are required, be sure the service
technician uses replacement parts specified by the
manufacturer or those that have the same characteristics
as the original part. Unauthorized substitutions may result
in fire, electric shock or other hazards.

21. SAFETY CHECK

Upon completion of any service or repairs to this unit, ask
the service technician to perform safety checks to
determine that the unit is in proper operating condition.

22. HEAT

The product should be situated away from heat sources
such as radiators, heat registers, stoves, or other products
(including amplifiers) that produce heat.

23. CONNECTING

When you connect the product to other equipment, turn off
the power and unplug all of the equipment from the wall
outlet. Failure to do so may cause an electric shock and
serious personal injury, Read the owner s manual of the
other equipment carefully and follow the instructions when
making any connections.

24. NOTE TO CABLE TV SYSTEM INSTALLER

This reminder is provided to call the Cable TV system
installer's attention to Article 820-40 of the NEC that
provides guidelines for proper grounding and, in particular,
specifies that the cable ground shall be connected to the
grounding system of the building, as close to the point of
cable entry as practical.

25. DISCONNECTING

To disconnect the main POWER, you must unplug the
power cord from the AC outlet. The power switch DOES
NOT completely disconnect power.

THE CAUSES OF INTERFERENCE

Incorporated in your TV set is the most up-to-date technology to eliminate
interference. Local radiation however, can create disturbances which in turn, can
noticeably affect the picture. Proper installation and a good antenna are your best
safeguards against these disturbances.

Interference

Moving ripples across the screen are caused by nearby transmitting or receiving shortwave radio
equipment.

Diathermy

Herringbone pattern and partial picture loss can result from the operation of diathermy equipment
from a nearby medical center or hospital.

Snow

Weak TV signals from long distant stations result in an unsteady picture and give the effect of
falling snow. An antenna adjustment or antenna amplifier may be needed.

Ghost

Multiple images caused by TV signals reflected back from surrounding buildings, hills, aircraft, etc.
are minimized by proper antenna positioning.

Car Ignition

Nearby cars and electrical motors can cause small streaks across the picture or make the picture
roll.

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