Maintenance Manual

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©2021 Broadcast Electronics
Telephone: [phone]
E-Mail: [e-mail]
RETURN, REPAIR, AND EXCHANGES
Do not return any merchandise without our written approval and Return Authorization. We will
provide special shipping instructions and a code number that will assure proper handling and
prompt issuance of credit. Please furnish complete details as to circumstances and reasons when
requesting return of merchandise. All returned merchandise must be sent freight prepaid and
properly insured by the customer.
MODIFICATIONS
Broadcast Electronics, reserves the right to modify the design and specifications of the equipment in
this manual without notice. Any modifications shall not adversely affect performance of the
equipment so modified.
SAFETY PRECAUTIONS
PLEASE READ AND OBSERVE ALL SAFETY PRECAUTIONS
DANGEROUS HAZARDS EXIST IN THE OPERATION OF POWER TRANSISTORS
The operation of power transistors involves one or more of the following hazards, any one of which,
in the absence of safe operating practices and precautions, could result in serious harm to personnel.
A. HIGH VOLTAGES & CURRENTS – AC mains voltages can be deadly. DC power
supplies and;/or batteries used in RF amplifier circuits can supply very high currents.
B. HOT SURFACES – Certain areas of the equipment, heat sinks and components may be
operating well above ambient temperature. In particular are the junction temperatures
of power transistors which can reach temperatures of several hundred degrees
centigrade and cause serious burns if touched
C. RF BURNS - RF power transistors and their circuits may contain high RF potentials. Do
not operate an RF power module with the covers removed.
RADIO FREQUENCY RADIATION
Exposure of personnel to RF radiation should be minimized, Personnel should not be permitted in
the vicinity of open energized RF generating circuits, or RF transmission systems (waveguides,
cables, connectors, etc.), or energized antennas. It is generally accepted that exposure to “high levels”
of radiation can result in severe bodily injury including blindness. Cardiac pacemakers may be
affected.
The effect of prolonged exposure to “low level” RF radiation continues to be a subject of investigation
and controversy. It is generally agreed that prolonged exposure of personnel to RF radiation should
be limited to an absolute minimum. It is also generally agreed that exposure should be reduced in
working areas where personnel heat load is above normal. A 10 mW/cm
2
per one tenth hour average