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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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Table of Contents
Related Manuals for Shure SR105
Summary of Contents for Shure SR105
- 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)
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Page 2: Specifications
. I 5 0 watts max. (33 ohms min.) onl y . Model SR105A onl y . "Model SR105B SR105 Power Amplifier SPECIFICATIONS Load Regulation: Di rect-Coupled Speaker Output . . Less than 1 dB from no-load to 4- 70-Volt Output* . - Page 3 TOTAL HARMONIC DISTORTION VS. OUTPUT POWER TO 150-WATT (33-OHM) LOAD AT 1 KHz FOR INCREASING OUT- PUT VOLTAGES (70V OUTPUT ONLY)* 'Model SRIO~A only. SR105 Power Amplifier SPECIFICATIONS (Curves shown are typical) OUTPUT POWER VS. FREQUENCY AT 1 % 81 2% TOTAL HAR-...
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Page 5: Table Of Contents
....Bridged Amplifier Connections Headphone Jack for Speaker Connections SR105 Power Amplifier Top View, Cover Removed (SR105A Model Shown) SR105 Power Amplifier Bottom View. Cover Removed (SR105A Model Shown) -
Page 7: Description
The Shure SR105 Power Amplifier is a high-power ampli- fier designed for sound reinforcement applications. It is capsble of delivering 200 watts rms to a 4-ohm load, and is available in two models, the SR105A and SR105B. The SRlO5A Power Amplifier provides both a direct-coupled... -
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
Using hardware supplied, secure Amplifier in rack or carrying case, allowing at least 51 mm (2 in.) above and behind case for ventilation. Use forced-air cooling for multiple-amplifier installations. SR105 Power Amplifier OPERATING INSTRUCTIONS 2. Set Switches (4,lO) to OFF and VOLUME Control (2) to 0. -
Page 10: Mounting And Ventilation
(F3, 1 ampere). These fuses are located under the chassis. FUNCTIONAL CIRCUIT DESCRIPTION (See Figure 4, Page 5) The inputs of the SR105 Power Amplifier consist of two unbalanced (grounded) phone jacks (13) and one balanced- - 7 " to 43°C (20"... -
Page 11: Sr105 Power Amplifier Block Diagram
- - - - - - - - - - - - SR105 POWER AMPLIFIER BLOCK DIAGRAM Additional SR105 Power Amplifiers may be added to the system for a fail-safe type operation where complete re- dundancy is required. Refer to the section on Bridging Connections (Page 11). -
Page 12: Output Connections
(8,9) is four ohms. The output voltage under these conditions is 28.3 volts. Speaker loads of less than four POWER AMPLIFIER UNBALANCED PARALLELED HIGH-IMPEDANCE INPUTS SR105 POWER AMPLIFIER SLEEVE FIGURE 5. INPUT CONNECTIONS ohms should not be used with this Amplifier. If less than... -
Page 13: 70-Volt Output Power Vs Direct Output Load Impedance From 4 Ohms To 100 Ohms
8-ohm direct output load. 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. -
Page 14: Recommended Wire Gauge Vs . Amplifier-To Speaker Distance: Direct Output
(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: Volt Output
The primary winding is also tapped and labeled with the wattage rating applicable to each tap. For example, the Shure A102A, a 50-watt transformer, has taps at 50, 25, 12 and 6 watts. (Transformers are available at various power . . . -
Page 16: Basic Operating Hints
VU meter, usually 0 VU. This can be done either with program material or with an internal tone oscillator as in the Shure SRlO1 Audio Con- sole. With this signal as an input to the Amplifier, adjust the VOLUME Control to provide the desired sound level from the speakers connected to the Amplifier. -
Page 17: Bridging Connections
IMPEDANCE.. 6 f i M I N e n . . . POWER TO POWER TO 1 6 n . . . 2 0 0 W VOLTAGE OUT SR105 AMPLIFIER L-PAD) J A C K PHONE N O T E... -
Page 18: Service Instructions
AMPLIFIER SERVICE (See Guarantee) The SR105 Power Amplifier uses components of the high- est quality, operating well within their respective ratings to assure long life. W A R N I N G Voltages in this equipment are hazardous to life. -
Page 19: Printed Circuit Board Removal
SRIOSA MODEL ONLY FIGURE 13. SR105 POWER AMPLIFIER TOP VIEW, adjustment screw below the meter face until the needle is properly positioned. With no load on the Amplifier (speaker disconnected), connect an ac voltmeter across one of the DIRECT OUTPUT Terminals. Turn the Amplifier on and ap- ply a 1 kHz sine-wave signal at approximately 3 volts rms to one of the Amplifier inputs. -
Page 20: Sr105 Power Amplifier Bottom View Cover Removed (Sr105A Model Shown)
M P4 SR105A MODEL ONLY FIGURE 14. SR105 POWER AMPLIFIER BOTTOM VIEW, SMALL SIGNAL AND PREDRIVER TRANSISTORS Transistors Q1 through Q6, Q13, Q14, and Q201 through Q203 are mounted on printed circuit boards. When re-... -
Page 21: Output Transistors
The required parts may be ordered through a local Shure Franchised Dealer or directly from the Shure Factory. No modifications to the metal chassis or front panel are required. W A R N I N G... -
Page 22: 70-Volt Conversion: Added Circuitry
PARTS Shure Part No. Qty. Transformer, 70V 51 A244 Output (T3) Switch, Slide, DPDT 55C131 6 4 ) Terminal Strip, 3- 56A204 Screw-Terminal (TS2) Filter Circuit 90A2038 Board Assembly (A21 are presently securing lamp socket assemblies; two more are Two locknuts *'Four machine screws presently securing rear-panel 70-Volt Conversion Cover (53A1319) may be used. -
Page 23: Service Lllustrations
Diagram shows all printed circuit board and chassis- mounted parts. GUARANTEE This Shure product is guaranteed in normal use to be free from electrical and mechanical defects for a period of one year from date of purchase. Please retain proof of purchase date. -
Page 24: 70-Volt Conversion: Internal Wiring
JI-J2 T S 2 H& MAIN CIRCUIT BOARD R 4 1 VOLUME FIGURE 70-VOLT CONVERSION: INTERNAL WIRING GROMMET &- FILTER CIRCUIT BOARD... - Page 26 REPLACEMENT PARTS FOR SR105 POWER AMPLIFIER Replacement Reference Kit. NO.* Designation Qty. 86A360 Q9-Q12 45EB439D R35-R40 46A041 45CB758C R43, R44 45CB308C R45, R46 52, S3 RKC37 55C131 XPLl XPL2 MAIN CIRCUIT BOARD ASSEMBLY RKC23 RKC21 D2, D3, D6 04, D5...
- Page 27 REPLACEMENT PARTS FOR SR105 POWER AMPLIFIER Reference Designation Kit. No.* RKC9 RKC53 FILTER BOARD ASSEMBLY (SRIOSA ONLY) C201 C202, C203 C204 C205 C206 Q201, Q202 RKC9 Q203 'Parts listed as RKC Kits should be ordered by that kit number. Any orders received for piece parts where RKC Kit number is shown will be shipped in RKC quantities ^*Use i n emergency only.
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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: Troubleshooting
NOTES TO CIRCUIT DIAGRAM GENERAL Shure part numbers are not shown in the Parts List accompanying the Circuit Diagram (Figure 21, Page 25) if parts are readily available through local electronics parts suppliers. In these instances, the Circuit Diagram shows only the reference designation and value of the standard parts. -
Page 31: Sr105 Power Amplifier Circuit Diagram
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. SR105 POWER AMPLIFIER CIRCUIT DIAGRAM... -
Page 33: Condensed Operating Instructions
13 other silicon transistors, and 1 Zener diode. Any Amplifier not meeting all of the above specifications shall be deemed unacceptable under this specification. The Amplifier shall be a Shure Model SR105A. SRlOSB POWER AMPLIFIER The Amplifier shall be a rack-mountable, 120-volt, 50/60 Hz line-operated, all silicon transistor, 200-watt powar amplifier. - Page 34 The Amplifier shall contain 4 silicon output transistors, 10 other silicon transistors, and 1 Zener diode. Any Amplifier not meeting all of the above specifications shall be deemed unacceptable under this specification. The Amplifier shall be a Shure Model SR105B.
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