Shure SR10 Operation And Service Manual
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Shure SR10 Operation And Service Manual

Shure SR10 Operation And Service Manual

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SR105 Power Amplifier
OPERATION AND SERVICE MANUAL
Manufactured by
SHURE BROTHERS INC.
222 Hartrey Avenue
Evanston, Illinois 60204 U.S.A.
W A R N I N G
To reduce the risk of fire or electric shock, do not
expose this appliance to rain or extreme moisture.
Copyright 1979, Shure Brothers Inc.
27A888 (SJ) (95B652)
Printed in U.S.A.

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  • Page 1 Evanston, Illinois 60204 U.S.A. W A R N I N G To reduce the risk of fire or electric shock, do not expose this appliance to rain or extreme moisture. Copyright 1979, Shure Brothers Inc. Printed in U.S.A. 27A888 (SJ) (95B652)

  • Page 2: Specifications

    SR105 Power Amplifier SPECIFICATIONS The following specifications apply to both SR105A and SR105B Power Amplifiers except where noted. The SR105A Power Amplifier provides both direct-coupled speaker output and transformer-coupled, constant-voltage, 70-volt output. The SRlO5B Power Amplifier is equipped for direct-coupled speaker output only. .
  • Page 3 SR105 Power Amplifier SPECIFICATIONS (Curves shown are typical) FREQUENCY (Hz1 OUTPUT POWER (WATTS) OUTPUT POWER VS. FREQUENCY AT 1 % 81 2% TOTAL HAR- TOTAL HARMONIC DISTORTION VS. OUTPUT POWER TO MONIC DISTORTION TO 4-OHM LOAD (DIRECT OUTPUT 4-OHM LOAD AT 50 HZ, 1 KHZ & 10 KHz (DIRECT OUTPUT ONLY) ONLY) LOAD RESISTANCE, OHMS...

  • Page 5: Table Of Contents

    SR105 Power Amplifier TABLE OF CONTENTS Section Page Section Page ............SPECIFICATIONS Replacement Parts .

  • Page 7: Description

    Shure Model SR101, a versatile, high- The Shure SR105 Power Amplifier is supplied with one quality, high-power, sound reinforcement system may be 1.8m (6 ft) audio input connecting cable and an acces-...

  • Page 8: Sr105 Power Amplifier Front Panel

    FIGURE 1. SR105 POWER AMPLIFIER FRONT PANEL FIGURE 2. SR105 POWER AMPLIFIER REAR PANEL (SR105A MODEL SHOWN)

  • Page 9: Operating Instructions

    SR105 Power Amplifier OPERATING INSTRUCTIONS 2. Set Switches (4,lO) to OFF and VOLUME Control (2) FUNCTIONAL IDENTIFICATION (Refer to Figures 1 and 2, to 0. Page 2). 3. Connect required speakers to Amplifier DIRECT OUT- 1. OUTPUT VOLTAGE Meter - lndicates Amplifier out- PUT jacks (8) andlor to terminal strip (9), using proper put voltage in percentage of maximum voltage.

  • Page 10: Mounting And Ventilation

    1.2 volts across a 25-kilohm load. dition is 450 watts (3.75 amperes at 120 volts). Idle power When using the Shure SR101 Audio Console as the consumption with no input signal is nominally 20 watts. mixer-preamplifier, connect the cable supplied with the...

  • Page 11: Sr105 Power Amplifier Block Diagram

    600-ohm termination for optimum performance. (This is not required with any Shure products.) When a 600-ohm interconnections. A low-capacitance, two-conductor, terminated input is required, a 620-ohm, 5%, %-watt re-...

  • Page 12: Output Connections

    UNBALANCED PARALLELED MIXER- POWER PREAMPLIFIER AMPLIFIER UNBALANCED PARALLELED HIGH-IMPEDANCE INPUTS TO POWER AMPLIFIER OR HIGH-IMPEDANCE TAPE RECORDER INPUT BALANCED BRIDGING INPUT TO POWER AMPLIFIER OR OTHER AUXILIARY EQUIPMENT SR105 MIXER- POWER PREAMPLIFIER AMPLIFIER 6-TT- SLEEVE 570,114 W FIGURE 5. INPUT CONNECTIONS OUTPUT CONNECTIONS ohms should not be used with this Amplifier.

  • Page 13: 70-Volt Output Power Vs Direct Output Load Impedance From 4 Ohms To 100 Ohms

    CAUTION Parallel connection of the DIRECT OUTPUT Con- nectors (8,9), or the speaker cables between two SR105 Power Amplifiers, or the SR105 Amplifier and any other amplifier, should not be attempted. Bal- ancing paralleled amplifiers is virtually impossible, and the circuitry mismatch cannot be balanced. The same precaution should be observed with regard to the 70V OUTPUT Connectors (11) of two SR105A Amplifiers, or the SR105A Amplifier and any other...

  • Page 14: Amplifier-To-Speaker Impedance Matching

    (see Figure 6, Page 7). If the speakers being used have a rated impedance of 16 ohms (such as the Shure SR102 and SR103), then four such speakers connected in parallel present a total load impedance of four ohms to the direct speaker output of the Amplifier.

  • Page 15: Output Voltage Meter

    For example, the dance may be calculated by the formula: Shure A102A, a 50-watt transformer, has taps at 50, 25, 12 and 6 watts. (Transformers are available at various power . . . etc.

  • Page 16: Basic Operating Hints

    This can be done either with program material or with an speakers. internal tone oscillator as in the Shure SRlO1 Audio Con- 4. Check for input and output cables re- sole. With this signal as an input to the Amplifier, adjust versed.

  • Page 17: Bridging Connections

    duce approximately 28.3 volts at the DIRECT OUTPUT Qty. Part Recommended Type Phone Jack Switchcraft 12-8 terminals (8,9), or 70 volts at the 70V OUTPUT terminals Phone Plug Switchcraft 280 (11) when the 70-volt input line is supplying 70 volts. Volume Control Switchcraft 666Pl or 656 (L-Pad)

  • Page 18: Service Instructions

    To maintain the highest possible performance and reliabil- be reached by removing the bottom cover. The dc balance ity, Shure factory replacement parts should be used. When of the Amplifier should be checked and adjusted as neces- ordering replacement parts, specify the Shure Replacement sary whenever any circuit components are replaced.

  • Page 19: Printed Circuit Board Removal

    R 3 9 R 4 0 D l 2 R 3 6 R 3 1 R 3 5 R 4 3 P L 2 P L 3 (XPL2) (XPL3) SRIOSA MODEL ONLY FIGURE 13. SR105 POWER AMPLIFIER TOP VIEW, COVER REMOVED (SRlOSA MODEL SHOWN) Circuit Board.

  • Page 20: Small Signal And Predriver Transistors

    SMALL SIGNAL AND PREDRIVER TRANSISTORS Main Circuit Board Transistors Q1 through Q6, Q13, Q14, and Q201 through Q203 are mounted on printed circuit boards. When re- placing these transistors i t is imperative that proper lead Letter Wire Color Letter Wire Color configuration be followed.

  • Page 21: Output Transistors

    Shure Franchised Dealer or directly from thermal joint compound between the heat sink base of the the Shure Factory. No modifications to the metal chassis or rectifier and the chassis to provide good heat transfer to front panel are required.

  • Page 22: 70-Volt Conversion: Added Circuitry

    CONVERSION SR105B AMPLIFIER TOOLS MATERIALS PARTS Shure Description Description Description Qty. Part No. Qty. Pliers, Diagonal, Locknuts, 10-32* Transformer, 70V 51 A244 or Wire Stripper Output (T3) Pliers, Long-nose Machine Screws, Switch, Slide, DPDT 55C131 Phillips Round 6 4 ) Screwdriver Head, 4-40 x 3/16"...

  • Page 23: Service Lllustrations

    J on the Main Circuit board. GUARANTEE CAUTION This Shure product is guaranteed in normal use to be free from electrical and mechanical defects for a period Be careful not to damage board or adjacent compo- of one year from date of purchase.

  • Page 24: 70-Volt Conversion: Internal Wiring

    JI-J2 T S 2 GROMMET &- FILTER CIRCUIT BOARD H& MAIN CIRCUIT BOARD R 4 1 VOLUME FIGURE 70-VOLT CONVERSION: INTERNAL WIRING...
  • Page 26 REPLACEMENT PARTS FOR SR105 POWER AMPLIFIER Commercial Replacement Reference Replacement Kit Consists Of: Alternate Kit. NO.* Designation Description Qty. Part No. Motorola 2N3741 86A362 Transistor, Silicon, PNP, Driver, BVCEO 120V min. (Selected) RCA 2N3773 86A360 Transistor, Silicon, NPN Q9-Q12 None Resistor, Fixed, 0.43 ohms, 5%, 7W R35-R40 45EB439D...
  • Page 27 REPLACEMENT PARTS FOR SR105 POWER AMPLIFIER Commercial Reference Replacement Kit Consists Of: Alternate Kit. No.* Designation Part No. Descri~tion Motorola 2N5088; 86A349 Transistor. Silicon. NPN TI 2N3711 RKC9 86A355 Transistor, Silicon, NPN Motorola MPS-A06 Motorola 2N5680 86A354 Transistor, Silicon, Power, PNP Motorola 2N5682 Transistor, Silicon, NPN RKC53...

  • Page 28: Main Circuit Board Parts Location Diagram

    FIGURE 18. MAIN CIRCUIT BOARD PARTS LOCATION DIAGRAM 2038-21525-2 FIGURE 19. FILTER CIRCUIT BOARD PARTS LOCATION DIAGRAM...

  • Page 29: Sr105 Power Amplifier

    GENERAL assembly are correct. If an incorrect ac voltage is found Shure part numbers are not shown in the Parts List at any board output, perform Dc Voltage Measurements on accompanying the Circuit Diagram (Figure 21, Page 25) that board as described below to isolate the problem area.

  • Page 31: Sr105 Power Amplifier Circuit Diagram

    LINE LEVEL INPUTS 120 VAC 5 0 1 6 0 H NOTE I: DIFFERENCES BETWEEN SRIOSA AND SR105B: "STRAIGHT- THROUGH" WIRING SHOWS SRlOSB CIRCUITS; SRIOSA CIRCUITS INCLUDE SRIOSB REFERENCE ASSEMBLY SWITCH S4, TRANSFORMER T3, AND TERMINAL DESCRIPTION STRIP TS2. I, R 9 WERE 12kb C13 ADDED C17, CIB ADDED FIGURE 21.

  • Page 33: Condensed Operating Instructions

    Amplifier from overheating The Amplifier shall be a Shure Model SR105A. due to short circuits, mismatched output loads, or high SRlOSB POWER AMPLIFIER ambient temperatures.
  • Page 34 Any Amplifier not meeting all of the above specifications sources. The balanced bridging input shall be a profes- shall be deemed unacceptable under this specification. sional three-pin audio connector. The unbalanced input The Amplifier shall be a Shure Model SR105B. connectors shall be standard %-inch phone jacks.

This manual is also suitable for:

Sr105

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