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Shure Brothers Incorporated222 Hartrey AvenueEvanston IL 60202-3696 U.S.A.UHF Wireless SystemE2000, Shure Incorporated Printed in U.S.A.25–1062–2 (

Shure U4D Dual Diversity UHF Receiver9 25D1062 (AG)Preliminary TestsPreliminary TestsTest Component LocationsRf-Audio Board, Side 1

Shure U4D Dual Diversity UHF Receiver1025D1062 (AG)Preliminary TestsAudio-Rf Board, Side 2

Shure U4D Dual Diversity UHF Receiver11 25D1062 (AG)Preliminary TestsListening TestBefore completely disassembling the receiver, operate it to determi

Shure U4D Dual Diversity UHF Receiver1225D1062 (AG)Preliminary Tests8. Make sure the tone key switch (S201) on the receiver rf-audioboard is in the ON

Shure U4D Dual Diversity UHF Receiver13 25D1062 (AG)Disassembly and AssemblyDisassembly and Assembly! IMPORTANT SAFETY INSTRUCTIONS !1.. READ these in

Shure U4D Dual Diversity UHF Receiver1425D1062 (AG)Disassembly and AssemblyFront Panel Removal1. Remove the three screws securing the brace and the rf

Shure U4D Dual Diversity UHF Receiver15 25D1062 (AG)Disassembly and AssemblyPrinted Circuit Board (PCB) RemovalRf-Audio Board Removal1. Tag and discon

Shure U4D Dual Diversity UHF Receiver1625D1062 (AG)Disassembly and AssemblyJ304J301J203DISPLAY BOARD DISPLAY BOARDNETWORKINTERFACE BOXMONITORBOARDDC P

Shure U4D Dual Diversity UHF Receiver17 25D1062 (AG)Service ProceduresService ProceduresProduct ChangesThe following changes have been made to the U4D

Shure U4D Dual Diversity UHF Receiver1825D1062 (AG)Service ProceduresTest EquipmentMost test equipment needed is described in the Shure Wireless Servi

E1999, Shure Incorporated Printed in U.S.A.25D1062 (AG)Service Manual25D1062 (AG)U4D Dual Diversity UHF ReceiverGeneralCharacteristicsThe Shure Model

Shure U4D Dual Diversity UHF Receiver19 25D1062 (AG)Service ProceduresAlignmentAlign Receivers 1 and 2 separately. Receiver 1 is on the left and Recei

Shure U4D Dual Diversity UHF Receiver2025D1062 (AG)Service ProceduresAlignment1. Turn the U4D receiver power ON.2. Connect the U4D receiver antennas.3

Shure U4D Dual Diversity UHF Receiver21 25D1062 (AG)Service ProceduresRf Tuning, Channel ADc Voltage VerificationC227C242P202P202P203S201ANTENNA A INP

Shure U4D Dual Diversity UHF Receiver2225D1062 (AG)Service ProceduresLocal Oscillator Frequency Alignment (Channel A)U308VCOTPRF6P202P202P203PIN 1S201

Shure U4D Dual Diversity UHF Receiver23 25D1062 (AG)Service ProceduresFM Detector Quadrature Coil Alignment (Channel A)AUDIO ANALYZERRF SIGNAL GENERA

Shure U4D Dual Diversity UHF Receiver2425D1062 (AG)Service ProceduresSecond Mixer Coil Alignment (Channel A)L313P202P202P203S201RF SIGNAL GENERATORANT

Shure U4D Dual Diversity UHF Receiver25 25D1062 (AG)Service ProceduresTHD Verification and RSSI Adjustment (Channel A)TP306 AUDIO CH ATP328 RSSI CH AR

Shure U4D Dual Diversity UHF Receiver2625D1062 (AG)Service ProceduresNoise Set-Up (Channel A)The Noise Setup procedure aligns each channel so that for

Shure U4D Dual Diversity UHF Receiver27 25D1062 (AG)Service ProceduresFM Detector Quadrature Coil Alignment (Channel B)AUDIO ANALYZERP202P202P203S201R

Shure U4D Dual Diversity UHF Receiver2825D1062 (AG)Service ProceduresSecond Mixer Coil Adjustment (Channel B)P202P203U313 / U316L324P202S201ANTENNA A

Shure U4D Dual Diversity UHF Receiver225D1062 (AG)Circuit DescriptionCircuit DescriptionPower SectionThe receiver accepts power line voltage ranging f

Shure U4D Dual Diversity UHF Receiver29 25D1062 (AG)Service ProceduresTHD Verification and RSSI Adjustment (Channel B)TP308R367U310P202P203P202S201ANT

Shure U4D Dual Diversity UHF Receiver3025D1062 (AG)Service ProceduresNoise Setup (Channel B)The Noise Setup procedure aligns each Channel so that for

Shure U4D Dual Diversity UHF Receiver31 25D1062 (AG)Service ProceduresAudio Level Setup, Channel BU207R250P202P202P203S201ANTENNA A INP202P202P203S201

Shure U4D Dual Diversity UHF Receiver3225D1062 (AG)Service ProceduresAudio Level Setup, Channel AU207R203P202P202P203S201ANTENNA A INP202P202P203S201A

Shure U4D Dual Diversity UHF Receiver33 25D1062 (AG)Service ProceduresTone Key Filter AlignmentReinstall the antennas for the Tone Key Filter Alignmen

Shure U4D Dual Diversity UHF Receiver3425D1062 (AG)Service ProceduresU4D Receiver 2 AlignmentThe Receiver 2 alignment procedure is identical to the Re

Shure U4D Dual Diversity UHF Receiver35 25D1062 (AG)Replacement Parts and DrawingsReplacement Parts and DrawingsU4D Model VariationsDifferent frequenc

Shure U4D Dual Diversity UHF Receiver3625D1062 (AG)Replacement Parts and DrawingsTable 4U4D Receiver Replacement PartsReference Designation Descriptio

Shure U4D Dual Diversity UHF Receiver37 25D1062 (AG)Replacement Parts and DrawingsU4D Receiver Replacement Parts (Continued)Reference Designation Desc

Shure U4D Dual Diversity UHF Receiver3825D1062 (AG)Replacement Parts and DrawingsTable 8Network Interface Printed Circuit Board Replacement Parts,Non-

Shure U4D Dual Diversity UHF Receiver3 25D1062 (AG)Circuit Descriptionond mixer. The second down–converter also incorporates an internal IFamplifier t

Shure U4D Dual Diversity UHF Receiver39 25D1062 (AG)Replacement Parts and DrawingsTable 11RF–Audio Printed Circuit Board Replacement Parts,SMT Compone

Shure U4D Dual Diversity UHF Receiver4025D1062 (AG)Replacement Parts and DrawingsTable 13VCO SelectionCountry Code UA205 VCO Range Shure Part NumberUA

Shure U4D Dual Diversity UHF Receiver41 25D1062 (AG)Replacement Parts and DrawingsSIDE 1SIDE 2Figure 18. Digital Display Printed Circuit Board Legend

Shure U4D Dual Diversity UHF Receiver4225D1062 (AG)Replacement Parts and DrawingsFigure 19. Headphone Monitor Printed Circuit Board Legend

Shure U4D Dual Diversity UHF Receiver43 25D1062 (AG)Replacement Parts and DrawingsSIDE 1SIDE 2Figure 20. Network Interface Printed Circuit Board Legen

Shure U4D Dual Diversity UHF Receiver4425D1062 (AG)NotesNotesThis page intentionally left blank.

Shure U4 UHF Diversity Receiver25D1062 (TL) 45U4 Rf-Audio Printed Circuit Board Legend (Side 1)

Shure U4 Diversity UHF Receiver4625D1062 (TL)U4 Rf-Audio Printed Circuit Board Legend (Side 2)

Shure U4D Dual Diversity UHF Receiver425D1062 (AG)Circuit Descriptioncompared to an adjustable squelch level (a dc level). If either channel’snoise is

Shure U4D Dual Diversity UHF Receiver5 25D1062 (AG)Circuit Descriptionthe LEDs. The output from this stage drives the audio level meter on thefront pa

Shure U4D Dual Diversity UHF Receiver625D1062 (AG)Circuit DescriptionUser Interface SectionThe user interface section consists of switches SW101 MENU,

Shure U4D Dual Diversity UHF Receiver7 25D1062 (AG)Circuit DescriptionDisplay Board Interconnect with Rf-Audio BoardIntegrated ribbon cable connector

Shure U4D Dual Diversity UHF Receiver825D1062 (AG)NotesNotesThis page intentionally left blank.