Shure Pro Master 700 Service Manual Download | Manualshive

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Summary of Contents for Pro Master 700

Page 1: ...Price 10 00 700 AND 706 SERIES SERVICE MANUAL Manufacturedby SHURE BROTHERS INC 222 Hartrey Avenue Evanston Illinois 60204 U S A Copyright 1981 Shure Brothers Inc AL663 Al 27A8027 Printed in U S A ...

Page 2: ... channels one channel Power Output driven driven Per channel 4 ohms 200W min 240W typical Per channel 8 ohms 125W min 145W typical Measured at 1 kHz 120Vac 1 THD Distortion THD typically less than 0 1 at 40 Hz and 1 kHz 0 25 at 15 kHz IM distortion typically less than 0 25 One channel driven 180W or less to 4 ohms 110W or less to 8 ohms mea sured from low impedance in put with individual and maste...

Page 3: ...IMP INPUT to SPEAKER OUT PUTS Hum and Noise 20 Hz to 20 kHz 127 dBV equivalent input BAL LO IMP Noise 300 Hz to 20 kHz 128 dBV equivalent input BAL LO IMP Signal to Noise Ratio Greater than 80 dB below full output at typical control set tings orange marks MASTER at 5 INPUT ATTEN at 12 Mic lnput Simplex Power 24 Vdc open circuit 1 8k series resistance simplex onloff switch Power Requirements Models...

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Page 5: ... Adjustment 7 DC Bias Current Adjustment 7 DB Peak IndicatorsIFeedback Finder Frequency Calibration 7 Full Wave Balance 7 DB Peak LED Calibration 8 Feedback Finder Calibration 8 Small Signal and Driver Transistors and Integrated Circuits 8 Driver Transistors 8 Output Transistors 8 Diode Bridge Rectifier 8 Transistor and Diode Removal 8 Active Component Checking 8 Printed Circuit Board Connectors 9...

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Page 7: ...ining type octave filters Each filter is continuously adjustable over a 213 dB range except for the lowest which is a 12 dB1octave cut only switch The FEEDBACK FINDER circuit switches the LEDs from power amp peak output level indicators to visual indicators of feedback frequency for eliminating feedback by graphic equalizer adjustment The built in electromechanical spring type reverbera tion devic...

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Page 9: ... a line matching trans former Shure A95FP to a HI IMP INPUT TROUBLESHOOTING Should any difficulty be encountered in console opera tion the problem can often be traced to some simple source such as an error in interconnection The following is offered as a basic guide to this type of problem PROBABLE CAUSE SYMPTOM OR CORRECTION 1 Console appears to be overheating TEMP WARNING LED on Console power am...

Page 10: ... of channel VOLUME and MASTER volume controls 1 SIMPLEX 24V switch is on when not needed 2 Unbalanced cable used when SIMPLEX 24V switch is on 3 Check for defective micro phone cables 1 Check MONITOR OUTPUT connection to EQ or PA INPUT or external amplifier 2 Make sure MONITOR and MONITOR MASTER controls are turned up 3 Monitor speaker volume con trol if present may be turned down 1 Excessive equa...

Page 11: ...t signal to establish a square wave of approximately 1 2 Vpp U916B also con tains the FEEDBACK FINDER THRESHOLD control R999 which is used to adjust the sensitivity of the circuit U916B s output is capacitively coupled to comparator U903A via an RC filter R915 C909 that attenuates any ultrasonic noise present in the signal The first comparator U903A is a zero crossing detector with the operating t...

Page 12: ...tors are not shown on the accompanying Parts List Their values are shown on the Circuit Diagrams Com mercial parts not readily available and unique parts are shown on the Parts List and may be ordered directly from the factory The commercial alternates shown on the Parts List are not necessarily equivalents but may be used in the event that direct factory replacements are not immediately avail abl...

Page 13: ...A8 INPUT ALIGN BRKT AIO MP4 C6 PRINTED CIRCUIT BOARD AND PARTS LOCATION FIGURE 1 ...

Page 14: ...ed with screws When removing front panel jack retaining nuts with a Y2 nutdriver or wrench be care ful not to damage the surface around the jack Boards or parts secured with nylon standoffs may be removed by using a long nose pliers to squeeze the locking lugs of the nylon standoffs on the circuit board side and sliding the board outward and off the standoffs The printed circuit board connectors c...

Page 15: ...s necessary whenever any Power Amplifier circuit components are replaced The dc output balance adjustment should be made before making the dc bias current adjustment The dc balance adjustment is made with all volume con trols down and no speaker load Connect a dc voltmeter preferably with a 0 1 Vdc full scale range across a SPEAKER OUTPUTS jack J16 J17 for channel A J18 J19 for channel B Use a sma...

Page 16: ...istors Q608 and Q609 except make certain the two diodes mounted below the heat sinks on Q612 and Q613 are thermally coupled with Wakefield Type 120 thermal joint compound to the heat sinks above them Also make sure that the thermistor assemblies are replaced and the output transistors are replaced in the same orientation as when they were re moved Position the thermistor lead wires so that they ar...

Page 17: ...f the part is shown on the adjacent circuit diagram NOTE Each circuit diagram applies to all 700 Series consoles Portions shown in red only apply to Models 700 and 700E6 Further differences are shown in notes at the bottom of each diagram Not a significant measurement PRINTED CIRCUIT BOARD CONNECTORS All printed circuit board connectors use the Molex KK Modular Interconnection System To replace a ...

Page 18: ...tion 1 Cut the bare jumper between the red black and blue white leads 2 Unsolder the blue lead and solder it to the redlblack lead 3 Unsolder the white transformer lead and solder it to the yellow lead 100V Operation 1 Unsolder the white AC lead and solder it to the white transformer lead terminal 2 Solder a jumper wire between the white transformer lead terminal and the terminal with blue and yel...

Page 19: ...zer Board Power Supply Board 700 Power Supply Board 700E6 Power Supply Board 706 Power Supply Board 706E6 Power Amplifier Board Ch A all models Power Amplifier Board Ch B 700 700E6 Output Connectors Board 700 700E6 Output Connectors Board 706 706E6 lnput Connectors Board 700 700E6 lnput Connectors Board 706 706E6 Output Controls Board 700 700E6 Output Controls Board 706 706E6 Reverb Pan LED Board ...

Page 20: ...allory TNT405U050POA CDE BR250 50 Sprague 502D 226G050CEl C Mallory MTV 25B35 Varo VT200 T Motorola 1N4002 Monsanto MV5075C TI or GE 1N4148 Motorola 1N5359A Motorola 1N4002 Motorola 1N4721 RCA 1N48 l N60 Littelfuse 314010 Qty 4 2 4 4 Part No 86N628 86F629 86A632 868632 86C629 86B636 86L628 86B629 86A640 86A404 86D422 86A415 86A428 86A410 86A406 86A405 80C323 Replacement Kit Consists Of Description...

Page 21: ...689 90BL2600 90BK2600 95A899 90BJ2600 55A145 95A8004 80A365 90BM2600 90A8101 90A2950 65A8013A 66A158 66A164 90E2232 Any orders None Replacement Kit Consists Of Description Fuse Slo Blo 5A 250V 700E6 Fuse Slo Blo 4A 250V 706 Fuse Slo Blo 3 15A 250V 706E6 Fuse Pigtail Slo Blo 1A 250V 700 706 Fuse Time Lag 1A 250V 700E6 706E6 Connector Contact only Connector Contact only Phone Jack 2 Conductor Outlet...

Page 22: ...5 R996 R131 R132 R231 R232 R331 R332 R926 R939 Parts listed as RKC quantities Selected for 120V BV l o Replacement Kit No RKC66 RKC65 Kits should be ordered by min Replacement Kit Consists Of Description Transistor Silicon PNP Transistor Silicon NPN Transistor Silicon Power PNP Transistor Silicon NPN Transistor Silicon NPN Transistor Silicon NPN Transistor Silicon PNP Transistor Silicon Power NPN ...

Page 23: ...r SPST ON OFF 700E6 706E6 55A139 Switch Rocker SPST ON OFF 700 706 55C119 55E140 1Switch Slide DPDT BELOW 63 FLAT Switch Slide DPDT SIMPLEX 55A99 Switch Rotary VOLTAGE SELECTOR 700E6 706E6 55E135 51A285 1Transformer Power 706 706E6 Switch Slide TPTT FEEDBACK FINDERTM 51A282 9082150 1Output Transformer and Shield Transformer Power 700 700E6 Commercial Alternate None None IRC or Dale PW 5A None IRC ...

Page 24: ...egrated Circuit Voltage Regulator Negative lntegrated Circuit Dual Operational Amplifier Ac Cable and Plug 91 2 ft 3 Conductor 700 Ac Cable and Plug 9 ft 3 Conductor Single Connector 700E6 Ac Cable and Plug 91 2 ft 3 Conductor 706 Ac Cable and Plug 9 ft 3 Conductor Single Connector 706E6 Fuseholder 700 706 Fuseholder 700E6 706E6 Commercial Alternate None Raytheon RC4156DB Raytheon LM339DB Raytheon...

Page 25: ...more unless otherwise specified Electrolytic capacitors are shown in microfarads x volts All resistor values are shown in ohms k 1000 Resis tors are 5 tolerance unless otherwise specified Resistors are wattunless otherwise specified Transistor lead codes are shown in Figure 4 Acceptable replacements are shown in the Parts List The following ground symbols denote Chassis Ground d 7 Circuit Ground P...

Page 26: ...d with respect to chassis unless otherwise indicated 2 Line voltage 120V 60 Hz 3 Test signal of 0 5 mV 1 kHz applied across pins 2 and 3 of connector J802 4 Ac voltage measurements may vary 30 from values shown 5 Measurements made with ac VTVM of 1 megohm or greater input impedance 6 No load on SPEAKER OUTPUTS jacks J16 J19 7 All controls in full clockwise settings 8 REVERB RETURN set to full coun...

Page 27: ...INPUTS 1 8 A C LINE INPUT I 5 5 V FZA O V E R L O A D I MODEL 700 AND 706 BLOCK DIAGRAM FIGURE 5 ...

Page 28: ... SIGNAL OF SmV 1 K H t APPLIED AGO55 PIN5 2 AND 3 OF LOW IMPEMNCE CONNfCTORS AC VOLTAGE MEASLREMENT MAY VARY f 30 GROM VAWES SHOWN ALL P C 80ARG5 Pa02 STEREO D HEADFWNES C J813 T POWER I L AUX INPUT 7 JBI 3 1 8 1 4 BLU w24 AUX IbJPUT 8 A I caer T IOOPF I DLK 24 r c CONNECTOR P802 J21 FUNCTION I MODEL 706 J815 TIP AND RING ARE CONNECTED ARE IUTERCDNNECTED AS IN FINAL UhJIT INPUT CONNECTCRS BOARD A8...

Page 29: ...INPUT CONNECTORS BOARD A8 PARTS LOCATION FIGURE 7 INPUT CONNECTORS BOARD A8 COMPONENT SIDE FIGURE 8 ...

Page 30: ...INPUT CONNECTORS BOARD A8 FOIL SIDE FIGURE 9 ...

Page 31: ...INPUT CONNECTORS BOARD A1 FOIL SIDE FIGURE 10 ...

Page 32: ...I MIS ...

Page 33: ... A G E 4 TEST ZIGNAL CF 6mV I UHt APPLIED BETWEEU 3LU AND BLK INPUT WIRES FROM 33K OHM 5 W R C E ALL VOLTAGES MEASUREL AT 2 5 O C WITH 120 VAC AM0 ALL P C WARDS INTERCONNECTED 65 IN PINAL U N I T VOLTAGE MEASLIHmEN E MAY VARY f 30 FROM VALUE5 S H O W b EQ AND PAN W T R O L S CENTERED ALL OTHER COIJTKO 5 FULLY CLOCKWISE INPUT CONTROLS BOARD A1 CIRCUIT DIAGRAM FIGURE 13 CONNECTOR PI01 J 2 MODEL 706 ...

Page 34: ... OTHEHVJISE SHOWN ECTRGLYTIC CAPACITORS SHOLJU I N uF X VOLTS 2 ALL RESISTORS 1 4 W 5 UNLESS OTHERW SE S H O I N 3 THE FOLLOkriNG SYMBOCS DENOTE j CHA351S P C BOARD GROUND 0 D C VOLTAGE b_JA C VOLTAGE 4 All VCXTAtES MEASWED AT 25 C WITH IZOVAC INPUT AT I KHz A N D L PC BOARDS INTERCWEfJTED A5 IN FI UNIT LOLTAGE VALUE5 ARE WPICAL AND M Y VARY f 30 t WIRES CAN BE I N T E W A t J G E D MODEL 706 D702...

Page 35: ...OUTPUT CONNECTORS BOARD A7 PARTS LOCATION FIGURE 15 OUTPUT CONNECTORS BOARD A7 COMPONENT SIDE FIGURE 16 ...

Page 36: ...OUTPUT CONNECTORS BOARD A7 FOIL SIDE FIGURE 17 ...

Page 37: ... TEST POINT FULL WAVE P B A L TEST POINT DB C A L OUTPUT CONTROLS BOARD A9 FOIL SIDE FIGURE 18 ...

Page 38: ...OUTPUT CONTROLS BOARD A9 PARTS LOCATION FIGURE 19 OUTPUT CONTROLS BOARD A9 COMPONENT SIDE FIGURE 20 ...

Page 39: ... VOLTAGE VARIABLE WITH FREQUENCY o lev t 1 5 v WlTH LED OFF 5V WlTH LED O N N KC SIGNAL GROUND p SIGNAL GROKN D R NC SIGNAL GROUND G i NO ZONNECTION I H 2 4 I VlO J6 P7SIJ IMONITGK 9UTPUT J 2 2 1 GRN LM PLO LC B I B FEAK NDLCATOR DRIVE L K 22 O R N JII F LOZC A I X PEAK 1NDICATOR DRIVE C 24 B L A C K IA 8 C 8 2 0 AUX 7 GROUND D NO CONNECTION SIGNAL G R O U N D F 24 B L U E 8 LR13 AUX 7 INPUT OUTPU...

Page 40: ...C BOA90 OROUND C D C VOLTAGE 0 A C VOLTAGE 4 ALL VOLTAGES MEASURED AT 2S C WITH I20 VAC AND ALL P C BOARDS I N T E R C N N E C T E G AS IN FINAL UNIT VOLTAGE MEASUREMENTS M A Y VARY 230 FROM VALUES SHOWN LED BOARD A l l COMPONENT SIDE FIGURE 23 5 ALL PIN L E T T E R S OF 5401 3402 CONNECT T O CORRESPONDING PIN LETTERS OF W901 W902 AND OR W903 6 4 ON A P l W I I I A l T 0UTPlJTU NTROCS d A R D A9 6...

Page 41: ...EQUALIZER BOARD A4 COMPONENT SIDE FIGURE 25 EQUALIZER BOARD A4 PARTS LOCATION FIGURE 26 ...

Page 42: ...EQUALIZER BOARD A4 FOIL SIDE FIGURE 27 ...

Page 43: ...POWER AMPLIFIER BOARD A6 FOIL SIDE FIGURE 28 ...

Page 44: ...1 D fa POWER AMPLIFIER BOARD A6 PARTS LOCATION FIGURE 29 POWER AMPLIFIER BOARD A6 COMPONENT SIDE FIGURE 30 ...

Page 45: ...NECTED TO HEAT SlNK OF Qbl3 R T U X CONNECTED T O HEAT SlNK OF Obi5 3 THE FOLLOWING SYMBOLS DENOTE RT603 CWNECTED TO HEAT SINK OF 0614 3DC VmTAGE I f VOLTAGE CONNECTOR P601 A 10 4 ALL VOLTCGES MEANRED AT 2 9 2 W I T H I 2 0 VAC L I N E I KHZ INWT AND ALL PC Bmm INTERCONNECTED AS IN FINAL UNIT 3 P W R AND HEADPHONE OUTPUTS ARE UNLOLUWD VOLTAGE VALUES ARE T V P U L AND M A Y VRRV I2Q0b POWER AMPLIFI...

Page 46: ... W 5 IhlLE55 OTHERWISE 5MCWN 3 THE FOLLOwlNG 5YMaOL5 DENOTE PC K W D I R O V N U 0 D C VOLTAGE 0 A C V TAGE 4 ALL VOLTA SES bAEAtjURED AT E0C WlTH 120 V A C LINE I KHz INWT v ii ALL P C BCAUVZ INTE COMNECTEC 5 IN FINAL UNIT V O L A E VI LI ES ARE WFlGU AND MAY VAGV t 309 YC U501 AND UW2 M IJMTED ON kEAT 5iNK5 REGULATED POWER SUPPLY BOARD A5 CIRCUIT DIAGRAM FIGURE 32 ...

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Page 48: ...REGULATED POWER SUPPLY BOARD A5 FOIL SIDE FIGURE 35 ...

Page 49: ...WLR AMP C M N N E L B SHIELD L A I T G J61 P 7 0 1 E BLK 22 TO JZI P 8 0 2 A BLK 2 2 T O M A l N S U P P L Y C E N T E R T A P E L K I 6 TO MAIN SUPPL f CEL T I tt 3 K a 1 0 MAINDER OF SCHEMATIC SEE INDIVIDUAL PRINTEOTO 9 P O I E ELK I 8 BOARD SCHEMATICS 2 THE FOLLOWING SYMBOLS DENOTE 7 CHA IS GRWN D aDC VOLTAGE I AC VOLTAGE 3 ALL VOLTAfjES MEASURED AT 25O C WITH 120 AC LINE I K H z INPUT AND ALL ...

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