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t
he operation instructions. Adjust only those controls
that are covered by the operating instruction, as an
improper adjustment of other controls may result in
damage and will often require extensive work by a
qualified technician to restore the product to its normal
o
peration.
E. If the product has been dropped or damaged in any
way.
F
. When the product exhibits a distinct change in perform-
ance — this indicates a need for service.
20. REPLACEMENTS PARTS — When replacement parts
are required, be sure the service technician has used
replacement parts specified by the manufacturer or have
the sam characteristics as the original part. Unauthorized
substitutions may result in fire, electric shock or other
hazards.
2
1. SAFETY CHECK
—
Upon completion of any service or
repairs to this product, ask the service technician to per-
form safety checks to determine that the product is in
proper operating condition.
22. WALL OR CEILING MOUNTING — The product should
b
e mounted to a wall or ceiling only as recommended by
the manufacturer.
23. HEAT — The product should be situated away from heat
s
ources such as radiators, heat resistors, or other prod-
ucts (including amplifiers) that produce heat.
EXAMPLE OF ANTENNA GROUNDING AS PER
NATIONAL ELECTRICAL CODE
ANTENNA
LEAD IN WIRE
GROUND
CLAMP
ANTENNA
DISCHARGE UNIT
(NEC SECTION 810-20)
GROUNDING CONDUCTORS
(NEC SECTION 810-21)
GROUNDING CLAMPS
POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250, PART H)
ELECTRIC
SER
VICE
EQUIPMENT
NEC-NATIONAL ELECTRICAL CODE
4