Operating and Safety Instructions Chapter 1

3-kW UHF Transmitter Chapter 1, Introduction
835-3, Rev. 0 1-2
Cleaning
– Unplug or otherwise disconnect all power from the equipment before cleaning.
Do not use liquid or aerosol cleaners. Use a damp cloth for cleaning.
Ventilation
– Openings in the cabinets and tray front panels are provided for ventilation.
To ensure reliable operation of the transmitter, and to protect the unit from overheating,
these openings must not be blocked.
Servicing
– Do not attempt to service this product yourself until becoming familiar with
the equipment. If in doubt, refer all servicing questions to qualified ADC service personnel.
Replacement Parts
– When replacement parts are used, be sure that the parts have the
same functional and performance characteristics as the original part. Unauthorized
substitutions may result in fire, electric shock, or other hazards. Please contact the ADC
Technical Service Department if you have any questions regarding service or replacement
parts.
1.4 Maintenance
The 835-3 is designed with components that require little or no periodic maintenance
except for the routine cleaning of the fans and the front panels of the trays.
The amount of time between cleanings depends on the conditions within the transmitter
room. While the electronics have been designed to function even if covered with dust, a
heavy buildup of dust, dirt, or insects will affect the cooling of the components. This could
lead to a thermal shutdown or premature failure of the affected trays.
When the front panels of the trays become dust covered, the top covers should be
removed and any accumulated foreign material should be removed. A vacuum cleaner,
utilizing a small wand-type attachment, is an excellent way to suction out the dirt. Alcohol
and other cleaning agents should not be used unless you are certain that the solvents will
not damage components or the silk-screened markings on the trays and boards. Water-
based cleaners can be used, but do not saturate the components. The fans and heatsinks
should be cleaned of all dust or dirt to permit the free flow of air for cooling purposes.
It is recommended that the operating parameters of the transmitter be recorded from the
meters on the trays and the system metering control panel at least once a month. It is
suggested that this data be retained in a rugged folder or envelope. Photocopies of the log
sheet should be made to allow you to make continued data entries.
1.5 Material Return Procedure
To insure the efficient handling of equipment or components that have been returned for
repair, ADC requests that each returned item be accompanied by a Material Return
Authorization Number (MRA#).
An MRA# can be obtained from any ADC Field Service Engineer by contacting the ADC Field
Service Department, Broadcast Systems Division, at [phone] or by fax at (724)
941-4603. This procedure applies to all items sent to the Field Service Department
regardless of whether the item was originally manufactured by ADC.
Note: To prevent damage to the product during shipping, ADC supplies a shipping
container to the customer at no cost.