Shure UHF MD Manuel de service

Shure Incorporated222 Hartrey AvenueEvanston IL 60202-3696 U.S.A.UHF Wireless SystemE2000 Shure Incorporated Printed in U.S.A.25–1022–2 (AG)SERVICE

Shure U2 Hand-Held UHF TransmitterDisassembly and Assembly25B1022 (AG) 9Disassembly and AssemblyATTENTIONObserve precautions when handling this static

Shure U2 Hand-Held UHF TransmitterNotes 25B1022 (AG)10NotesThis page intentionally left blank.

Shure U2 Hand-Held UHF TransmitterService Procedures25B1022 (AG) 11Service ProceduresService NoteUnits With Date Codes Earlier Than August 1996A small

Shure U2 Hand-Held UHF TransmitterService Procedures 25B1022 (AG)12Antenna ReplacementThe top printed circuit board (pcb) is connected to the bottom p

Shure U2 Hand-Held UHF TransmitterService Procedures25B1022 (AG) 13Test EquipmentMeasurement ReferencedBu is a measure of voltage, and dBm is a measur

Shure U2 Hand-Held UHF TransmitterService Procedures 25B1022 (AG)14Test Set-Up1. Use a UA802 0.61 m (2 ft) coaxial cable or an RG58 low-loss 50 Ω cabl

Shure U2 Hand-Held UHF TransmitterService Procedures25B1022 (AG) 15Rf AlignmentVC201J103 FREQUENCY COUNTERU2 Transmitter Frequency CounterPower (S101)

Shure U2 Hand-Held UHF TransmitterService Procedures 25B1022 (AG)16Audio AlignmentDeviation Reference VoltageS201 (INSIDE U4)U4 RECEIVERRF SIGNAL GENE

Shure U2 Hand-Held UHF TransmitterService Procedures25B1022 (AG) 17Deviation Reference Voltage AdjustmentR286U4 RECEIVERAUDIO ANALYZERTEST HEADRETAINI

Shure U2 Hand-Held UHF TransmitterService Procedures 25B1022 (AG)18Tone Key Level Adjustment1. Use a dc power supply to apply 2.5 ± 0.01 Vdc to the ba

E1999, Shure Incorporated Printed in U.S.A.25B1022 (AG)Service ManualU2 Hand-Held UHF TransmitterGeneralCharacteristicsThe Shure Model U2 Hand-Held UH

Shure U2 Hand-Held UHF TransmitterBench Checks25B1022 (AG) 19Bench ChecksDc Problemsn Verify the battery voltage is between 2 and 3.5 V.n Check for pr

Shure U2 Hand-Held UHF TransmitterBench Checks 25B1022 (AG)20Low Rf Output Powern Check the polarity of the microwave isolator (rf IN is marked with a

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings25B1022 (AG) 21Replacement Parts and DrawingsModel VariationsDifferent frequency versi

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings 25B1022 (AG)22Parts DesignationsThe following comments apply to the parts list and th

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings25B1022 (AG) 23Table 5Printed Circuit Board Replacement Parts: Side 1ReferenceDesignat

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings 25B1022 (AG)24Table 6Printed Circuit Board Replacement Parts: Side 2ReferenceDesignat

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings25B1022 (AG) 25NotesThis page intentionally left blank.

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings 25B1022 (AG)26U2 Hand-Held TransmitterDigital DisplayPrinted Circuit Board Legend“F”

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings25B1022 (AG) 27U2 Hand-Held TransmitterDigital DisplayPrinted Circuit Board Legend“G”

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings 25B1022 (AG)28U2 Hand-Held TransmitterRf-Audio Printed Circuit BoardLegend“F” and Ear

Shure U2 Hand-Held UHF TransmitterCircuit Description 25B1022 (AG)2Circuit DescriptionAudio SectionAudio enters L248, an inductor used as an rf choke.

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings25B1022 (AG) 29U2 Hand-Held TransmitterRf-Audio Printed CircuitBoard Legend“G” and Lat

Shure U2 Hand-Held UHF TransmitterReplacement Parts and Drawings 25B1022 (AG)30U2 Hand-Held TransmitterMicrophone Head Board

Shure U2 Hand-Held UHF TransmitterNotes25B1022 (AG) 31NotesThis page intentionally left blank.

Shure U2 Hand-Held UHF TransmitterCircuit Description25B1022 (AG) 3ence from external rf fields. Regulated 5 Vdc power from the dc/dc con-verter ensur

Shure U2 Hand-Held UHF TransmitterCircuit Description 25B1022 (AG)4operating frequency to the microcontroller. The oscillator circuit includesC102, C1

Shure U2 Hand-Held UHF TransmitterPreliminary Tests25B1022 (AG) 5Preliminary TestsTest Component LocationsTOPBOTTOMDIGITAL DISPLAY BOARDTOPBOTTOMRF-AU

Shure U2 Hand-Held UHF TransmitterPreliminary Tests 25B1022 (AG)6Listening TestBefore completely disassembling the transmitter, operate it to deter-mi

Shure U2 Hand-Held UHF TransmitterPreliminary Tests25B1022 (AG) 7Frequency ResponseValues between board versions may vary slightly; the following valu

Shure U2 Hand-Held UHF TransmitterNotes 25B1022 (AG)8NotesThis page intentionally left blank.