Shure PG Wireless Service Manual

PG4 Wireless Reciever Service Manual©2006 Shure Incorporated25A1104(Rev.1) 25A1104PG4 WIRELESS RECEIVERPRODUCT DESCRIPTIONThe Shure Model PG4 is a dua

1025A1104 (Rev.1)NOTES

1125A1104 (Rev.1)FUNCTIONAL TESTGENERAL INFORMATION LOOKUP TABLEREQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):LISTENING TESTBefo

1225A1104 (Rev.1)TONE KEY INDICATOR1. Modulate the RF signal with 32.768 kHz tone key generator. (If using an HP E4400B RF Generator use the Dual-Sine

1325A1104 (Rev.1)ASSEMBLY AND DISASSEMBLYASSEMBLY INSTRUCTIONS (REVERSE FOR DISASSEMBLY)1.2.!CAUTION!Observe precautions when handling this static-sen

1425A1104 (Rev.1)3.REF HIGH BANDREF HIGH BAND LEFT LEFTREF LOW BANDREF LOW BAND LEFT LEFTREF LOW BAND, RIGHTREF LOW BAND

1525A1104 (Rev.1)SERVICE PROCEDURESMEASUREMENT REFERENCENOTE: Audio levels in dBu are marked as dBm on the HP8903.REQUIRED TEST EQUIPMENT (OR APPROVE

1625A1104 (Rev.1)ALIGNMENT AND MEASUREMENT PROCEDUREGeneral notesThe following procedures are intended for a "bench" testing environment onl

1725A1104 (Rev.1)POWER TEST SECTION1. Measure +9.0 Vdc + 0.2 /-0.2 Vdc at test point "TP_9V" 2. Measure +5.0 Vdc + 0.1 /-0.1 Vdc at test poi

1825A1104 (Rev.1)4. Set signal generator level= -100 dBm. 5. Set signal generator to corresponding frequency.6. Measure SINAD at TPR (Pin 7 of IC610)

1925A1104 (Rev.1)NOTES

225A1104 (Rev.1)DETAILED DESCRIPTIONFront Panel1 audio LEDIndicates strength of incoming audio signal: green for normal, amber for strong, red for pea

2025A1104 (Rev.1)AGENCY APPROVALSFCC DD4 PG4 (Part 15 "Declaration of Conformity" filed)IC RSS-123 (Canada # 616A-PG4) Professional OnlyCE (

2125A1104 (Rev.1)FREQUENCY TABLESH7 536 - 548 K7 590 - 602 M7 662-674 M10 674-686 P11 702-714 Q11 740-752CH Freq CH Freq CH Freq CH Freq CH Freq CH Fr

2225A1104 (Rev.1)PRODUCT SPECIFICATIONSSystemWorking Range 75m (250 ft.)Note: actual range depends on RF signal absorption, reflection, and interferen

2325A1104 (Rev.1)TROUBLESHOOTINGCurrent draw and DC regulator tests1. Connect the PS20 DC power supply to CON400.2. Verify current draw is 120mA +/-

2425A1104 (Rev.1)under test can cause erratic and poor measurements. Verify using a spectrum analyzer that the frequency of operation under test has n

2525A1104 (Rev.1)emitter dc measurements are not correct replace Q603. If the voltages on Q603 were correct troubleshoot for correct component placeme

2625A1104 (Rev.1)Fails/Weak Audio at TPBAL2/TPBAL31.) Confirm audio at TPE2.) Confirm 4.5VDC at TP_Vref3.) Confirm tone key in RF signal or R280

2725A1104 (Rev.1)NOTES

2825A1104 (Rev.1)REPLACEMENT PARTSPRODUCT CHANGESPARTS DESIGNATIONSThe following comments apply to the parts list and the schematics:Resistors: Unles

2925A1104 (Rev.1)PG4 HARDWARE REPLACEMENT PART PG4 PCB REPLACEMENT COMPONENTSReference Description Shur

325A1104 (Rev.1)CIRCUIT DESCRIPTIONGeneral block diagram description.The receiver consists of the following components: Image filters, predictive dive

3025A1104 (Rev.1) PG4 FREQUENCY DEPENDENT PARTS**Fr e q u e nc y H 7 K 7 M 7 M 10 P 11 Q 11 R 10

3125A1104 (Rev.1) UNPLACED COMPONENT LIST**NOTE: APPLIES TO ALL FREQUENCY CODESC103 C114 C165 C346 C347 C520 C521 C600 C602C6

3225A1104 (Rev.1)PCB LAYOUTDGND+3.3VTPRVREFTP RSSI - A2DTP5VTP9VTP600TP750TPI5VPLUTP3TP2TPN

3325A1104 (Rev.1)

425A1104 (Rev.1)The first, the second VCO's and PLLThe first VCO is a two-stage design composed of an oscillator stage and a buffer stage. Its fr

525A1104 (Rev.1)RF & AUDIO BLOCK DIAGRAM From µP Controller Audio & Muting CircuitryAudio Proc MutingUnbalancedBalanced18 kHz LPFTone KeyDetec

625A1104 (Rev.1)Digital SectionThe Freescale 8Kb FLASH microprocessor was chosen to maximize its benefits and to reduce system cost. The internal ADC

725A1104 (Rev.1)RF BAND RESISTORSFour resistors Ra, Rb, Rc, and Rd are responsible to start the microcontroller in a RF band. Table 2 shows the refere

825A1104 (Rev.1)Microcontroller Netnames and Programming Testpoint List Pin Port Name Testpoint 1 RESETn Reset TP_RST 2 PTC0/TxD2 Seven Segment A

925A1104 (Rev.1)The microprocessor reads the RSSI level from an ADC several times a second when the PG4 is unmuted, to predict if a switch is neces-sa