Shure sr 106 service manual
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Extracted text from shure sr 106 service manual (Ocr-read)
Page 1
FIGURE A. SR106 FRONT PANEL Temperature Range: ................ Operating - 7" to 57°C (20" to 135°F) Storage .............. _ - 29" to 71 "C (-20" to 160°F) Dimensions ................ 44.5 mm height x 483 mm width x 216 mm depth (1% in. x 19 in. x 8% in.) ........................ Weight 3 kg (6 Ib, 8.8 oz) Finish .......................... Matte black Installation .................. Equipped for standard 483 mm (19 in.) audio rack mounting; may be operated in optional A30A or A105A Carrying Case (with other equipment) Certifications .............. ~isted by Underwriters' Labora- tories, Inc.; listed by Canadian Standards Association as cer- tified (SR106 only) OPERATING INSTRUCTIONS Functional Description (Refer to Figures A and B) 1. Power-On Indicator Lamp-Indicates ac power is being applied to unit. 2. POWER ON-OFF Switch-Controls ac power to unit. 3. LlNE LEVEL OUTPUTS/LOW FREQUENCY 3- Pin Male Connector-Provides low-frequency balanced output connection to power amplifier. May be unbalanced externally. 4. LlNE LEVEL OUTPUTS/LOW FREQUENCY Phone Jack-Provides low-frequency balanced or unbalanced output connection to power am- plifier. 5. LlNE LEVEL OUTPUTS/HIGH FREQUENCY Phone Jack-Provides high-frequency balanced or unbalanced output connection to power am- plifier. 6. LlNE LEVEL OUTPUTS/HIGH FREQUENCY 3- Pin Male Connector-Provides high-frequency balanced output connection to power amplifier. May be unbalanced externally. 7. CROSSOVER FREQUENCY Slide Switch- Selects crossover frequency of 500 Hz, 800 Hz or 2600 Hz for separation of high- and low- frequency signals to power amplifiers. 8. LlNE LEVEL INPUT 3-Pin Female Connector- Provides balanced bridging, high-impedance in- put connection from audio console or mixer- preamplifier. May be unbalanced externally. 9. LlNE LEVEL INPUT Phone Jack-Provides ba- lanced or unbalanced bridging, high-impedance input connection from audio console or mixer- preamplifier. 10. Ac Grounded Line Cord-Connects unit to ac power source (SR106 only). 11. AC (MAINS) POWER 3-Pin Connector-Con- nects unit to ac (mains) power source via supplied line cord (SR106-2E only). 12. VOLTAGE SELECTOR Slide Switch-Selects 115V or 220V input power (SR106-2E only). General Operating Instructions WARNING To reduce the risk of fire or electric shock, do not expose this appliance to rain or extreme moisture. 1. Using hardware provided, install SR106 securely in 483 mm (standard 19 in.) rack or optional A30A or A105A Carrying Case prior to making electrical connections. 2. Connect SR106 LlNE LEVEL OUTPUT/LOW FRE- QUENCY 3-pin connector or phone jack (3, 4) to (low frequency) power amplifier line level input. 3. Connect SR106 LlNE LEVEL OUTPUT/HIGH FREQUENCY &pin connector or phone jack (5, 6) to second (high frequency) power amplifier line level input. 4. Connect audio console or mixer-preamplifier line level output to SR106 LlNE LEVEL INPUT &pin connector or phone jack (8, 9). 5. Make sure speaker systems are properly con- nected to power amplifiers and are adjusted for biamplified operation. MTIM if(TOR t rr rolula 3 whr II SR106-2E ONLY 12 10 3 7 8 9 FIGURE B. SR106 REAR PANEL
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6. Move CROSSOVER FREQUENCY Switch (7) to select proper crossover frequency (see Speaker Operating Instructions). 7. (SR106-2E only) Move VOLTAGE SELECTOR Switch (12) to 115V or 220V position as desired. 8. Connect ac line cord to grounded 108- to 132- volt (SR106), or 105-1 25V or 210-250V (SR106- 2E), 50/60 Hz ac source. 9. Turn on front-panel POWER ON-OFF Switch (2). Red indicator lamp (1) will go on, indicating power application. The SR106 is now operating. 1 @. Adjust audio console or mixer-preamplifier and power amplifier controls for desired operating levels. Mounting and Ventilation The SR106 Electronic Crossover is designed for rack-mounting in a 483 mm (standard 19 in.) audio equipment cabinet rack and is supplied with the nec- essary mounting hardware (see Figure C). If possible, the SR106 should be rack-mounted below its asso- ciated power amplifiers. The SR106 may also be operated while mounted in a Shure A30A or A105A Carrying Case. The A30A has a panel height capacity of 88.9 mm (3Y2 in.), pro- viding space for two SRlOG's, or one SR106 and one other unit of 44.5 mm (1% in.) height. The A105A has a panel height of 178 mm (7 in.), providing space for up to four SRlO6's, or one SR106 and other equipment totaling 133.4 mm (5Y4 in.) in height. No special precautions are required for ventilation. The SR106 may be operated over a temperature range of - 7" to 57°C (20" to 135°F) in continuous duty with- out derating. 483 mm (19 1N! -44 4 mrn(1-3/4 IN, 'NOT lNCLUDlN6 CABLE/CONNECTOR CLEARANCE DEPTH FIGURE C. OVERALL DIMENSIONS Power Supply The SR106 is furnished with a three-conductor power cable and three-prong grounded plug (10). Connect the SR106 to an outlet which supplies 108 to 132 volts ac, 50/60 Hz power. Maximum power consumption at 120 volts under normal operating conditions is 3 watts (0.025 amperes at 120 volts). If extension cords are required, a high-quality, 18-gauge or larger cord should be used. The SR106-2E is furnished with a three-conductor line cord without a power plug. Obtain a suitable 3-pin male power plug and attach it to the line cord. The plug should be installed by qualified service personnel. (Brown lead goes to "hot" or "live" terminal, blue lead to neutral terminal, and greenfyellow lead to ground or earth terminal.) Select proper operating voltage (115V for 105-125V supply or 220V for 210-250V supply) using the VOLTAGE SELECTOR Switch (12). A POWER ON-OFF toggle switch on the front panel (2) controls the application of ac power to the SR106, and a red indicator lamp (1) indicates the power-on condition. The tamper-proof cover supplied (SR106 only) may be used to eliminate accidental movement of this switch. Functional Circuit Description The inputs of the SR106 Electronic Crossover con- sist of one phone jack (9) and one three-pin female audio connector (8) (see Figure D). The phone jack is a three-circuit (stereo) type and is wired in parallel with the three-pin connector to provide a balanced in- put with either connector. The input signal then passes through a 6 dB stepdown input isolation transformer to a unity-gain buffer amplifier. The next stage is a 12 dB/octave high-pass filter with an operating frequency of 500 Hz, 800 Hz or 2600 Hz. All frequencies above the selectable operating fre- quency are routed to a unity-gain filter amplifier stage. One output of this stage goes to a 6 dB gain, 600-ohm line driver, which drives the high-frequency output transformer to +I8 dBm. The other output goes to a differential amplifier/line driver stage, which also receives an input from the first buffer amplifier stage. The differential amplifier/line driver stage thus de- rives the low-pass signal by responding to the differ- ence between the buffer amplifier signal (all-pass) and the filter circuit signal (high-pass). The difference signal ampli.tude rolls off at 6 dB/octave. The differ- ence signal is amplified and drives the low-frequency output transformer. The resulting frequency response curves are shown in Figure E. Adding the two outputs out-of-phase provides a flat output response from 20 to 20,000 Hz. High- and low-frequency outputs appear on both phone jacks and three-pin, professional, male audio connectors. HIGH-PASS FILTER HIGH FREQUENCY LlNE LEVEL INPUT - - - - - - - - - - - - - - - - - 1 LINE LEVEL OUTPUTS LOW FREQUENCY LlNE LEVEL OUTPUTS FIGURE D. BLOCK DIAGRAM