UBS Axcera 840A 10,000-watt UHF solid state television transmitter User Manual Chapter 1

UBS-Axcera 10,000-watt UHF solid state television transmitter Chapter 1

Chapter 1

10-kW UHF Transmitter with Chapter 1, IntroductionFeedforward Drive840A, Rev. 0 1-1Chapter 1IntroductionThis manual explains the installation,setup, alignment, and maintenanceprocedures for the 840A 10-kW UHFtransmitter with feedforward drive. It isimportant that you read all of theinstructions, especially the safetyinformation in this chapter, before youbegin to install or operate the unit.1.1 Manual OverviewThis instruction manual is divided intofive chapters and supporting appendices.Chapter 1, Introduction, containsinformation on the assembly numberingsystem used in the manual, safety,maintenance, return procedures, andwarranties. The second chapter describesthe transmitter and includes discussionson system control and status indicatorsas well as remote control connections.Chapter 3 explains how to unpack,install, setup, and operate thetransmitter. Chapter 4 contains adetailed discussion of the circuits andboards that make up the 840Atransmitter. Chapter 5, DetailedAlignment Procedures, providesinformation on adjusting the system toachieve peak operation of theassemblies. The appendices containassembly and subassembly drawings andparts lists as well as systemspecifications.1.2 Assembly Designation ProcedureADC has assigned assembly numbers,such as Ax (x=1,2,3…), to all assemblies,trays, and boards that are referenced inthe text of this manual and shown on theblock diagrams and interconnectdrawings provided in the appendices.These supporting documents arearranged in increasing numerical order inthe appendices. Section titles in the textfor assembly and tray descriptions oralignment procedures also indicate theassociated drawing(s) and the relevantappendix that contains that drawing.Sections describing vendor-supplieditems, such as meters and powersupplies, do not contain this information.1.3 SafetyThe UHF transmitters manufactured bythe Broadcast Systems Division of ADCare designed to be easy to use and repairwhile providing protection from electricaland mechanical hazards. Listedthroughout the manual are notes,cautions, and warnings concerningpossible safety hazards that may beencountered while operating or servicingthe transmitter. Please review thesewarnings and familiarize yourself with theoperation and servicing proceduresbefore working on the transmitter.Read All Instructions – All of theoperating and safety instructions shouldbe read and understood before operatingthis equipment.Retain Manuals – The manuals for thetransmitter should be retained at thetransmitter site for future reference. Weprovide two sets of manuals for thispurpose; one set can be left at the officewhile one set can be kept at the site.Heed all Notes, Warnings, andCautions – All of the notes, warnings,and cautions listed in this safety sectionand throughout the manual must befollowed.Follow Instructions – All of theoperating and use instructions for thetransmitter should be followed.Cleaning – Unplug or otherwisedisconnect all power from the equipmentbefore cleaning. Do not use liquid oraerosol cleaners. Use a damp cloth forcleaning.
10-kW UHF Transmitter with Chapter 1, IntroductionFeedforward Drive840A, Rev. 0 1-2Ventilation – Openings in the cabinetsand tray front panels are provided forventilation. To ensure reliable operationof the transmitter, and to protect the unitfrom overheating, these openings mustnot be blocked.Servicing – Do not attempt to servicethis product yourself until becomingfamiliar with the equipment. If in doubt,refer all servicing questions to qualifiedADC service personnel.Replacement Parts – Whenreplacement parts are used, be sure thatthe parts have the same functional andperformance characteristics as theoriginal part. Unauthorized substitutionsmay result in fire, electric shock, or otherhazards. Please contact the ADCTechnical Service Department if you haveany questions regarding service orreplacement parts.1.4 MaintenanceThe 840A is designed with componentsthat require little or no periodicmaintenance except for the routinecleaning of the fans and the front panelsof the trays.The amount of time between cleaningsdepends on the conditions within thetransmitter room. While the electronicshave been designed to function even ifcovered with dust, a heavy buildup ofdust, dirt, or insects will affect thecooling of the components. This couldlead to a thermal shutdown or prematurefailure of the affected trays.When the front panels of the traysbecome dust covered, the top coversshould be removed and any accumulatedforeign material should be removed. Avacuum cleaner, utilizing a small wand-type attachment, is an excellent way tosuction out the dirt. Alcohol and othercleaning agents should not be usedunless you are certain that the solventswill not damage components or the silk-screened markings on the trays andboards. Water-based cleaners can beused, but do not saturate thecomponents. The fans and heatsinksshould be cleaned of all dust or dirt topermit the free flow of air for coolingpurposes.It is recommended that the operatingparameters of the transmitter berecorded from the meters on the traysand the system metering control panel atleast once a month. It is suggested thatthis data be retained in a rugged folderor envelope.1.5 Material Return ProcedureTo insure the efficient handling ofequipment or components that have beenreturned for repair, ADC requests thateach returned item be accompanied by aMaterial Return Authorization Number(MRA#).An MRA# can be obtained from any ADCField Service Engineer by contacting theADC Field Service Department, BroadcastSystems Division, at (724) 941-1500 orby fax at (724) 941-4603. This procedureapplies to all items sent to the FieldService Department regardless ofwhether the item was originallymanufactured by ADC.Note: To prevent damage to theproduct during shipping, ADCsupplies a shipping container to thecustomer at no cost.When equipment is sent to the field onloan, an MRA# is included with the unit.The MRA# is intended to be used whenthe unit is returned to ADC. In addition,all shipping material should be retainedfor the return of the unit to ADC.Replacement assemblies are also sentwith an MRA# to allow for the properrouting of the exchanged hardware.Failure to close out this type of MRA# willnormally result in the customer beinginvoiced for the value of the loaner itemor the exchange assembly.
10-kW UHF Transmitter with Chapter 1, IntroductionFeedforward Drive840A, Rev. 0 1-3When shipping an item to ADC, pleaseinclude the MRA# on the packing list andon the ADC-provided shipping container.The packing slip should also includecontact information and a briefdescription of why the unit is beingreturned.Please forward all MRA items to:ADCBroadcast Systems Division102 Rahway RoadMcMurray, PA 15317-3349 USAFor more information concerning thisprocedure, call the ADC Field ServiceDepartment, Broadcast Systems Division.ADC, Broadcast Systems Division, canalso be contacted through e-mail atbsd_service@adc.com and on the Webat www.adc.com/broadcast.1.6 Warranty for Broadcast Products– Limited One-Year WarrantyADC warrants each new product that ithas manufactured and sold againstdefects in material and workmanshipunder normal use and service for aperiod of one (1) year from the date ofshipment from ADC's plant, whenoperated in accordance with ADC'soperating instructions. This warrantyshall not apply to tubes, fuses,batteries, or bulbs.Warranties are valid only when and if(a) ADC receives prompt written noticeof breach within the period of warranty,(b) the defective product is properlypacked and returned by the buyer(transportation and insurance prepaid),and (c) ADC determines, in its solejudgment, that the product is defectiveand not subject to any misuse, neglect,improper installation, negligence,accident, or (unless authorized inwriting by ADC) repair or alteration.ADC's exclusive liability for any personaland/or property damage (includingdirect, consequential, or incidental)caused by the breach of any or allwarranties, shall be limited to thefollowing: (a) repairing or replacing (inADC's sole discretion) any defectiveparts free of charge (F.O.B. ADC’s plant)and/or (b) crediting (in ADC's solediscretion) all or a portion of thepurchase price to the buyer.Equipment furnished by ADC, but notbearing its trade name, shall bear nowarranties other than the special hours-of-use or other warranties extended byor enforceable against the manufacturerat the time of delivery to the buyer. NOWARRANTIES, WHETHERSTATUTORY, EXPRESSED, ORIMPLIED, AND NO WARRANTIES OFMERCHANTABILITY, FITNESS FORANY PARTICULAR PURPOSE, ORFREEDOM FROM INFRINGEMENT,OR THE LIKE, OTHER THAN ASSPECIFIED IN PATENT LIABILITYARTICLES, AND IN THIS ARTICLE,SHALL APPLY TO THE EQUIPMENTFURNISHED HEREUNDER.

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