m67_ug 电路图.pdf

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1、222 H A R T R E Y AVE., EVANSTON, IL. 60204 U . S . A . A R E A C O D E 312/328-9000 CABLE: S H U R E M I C R O (S; The M67 is a transistorized microphone mixer/remote amplifier specifically designed for professional ap- plications. The excellent performance and versatility of this complete, compact

2、 console make it an ideal choice for studio, remote, or original sound reinforce- ment use, and as an add-on mixer for expanding existing facilities. It is also ideally suited for use with tape recorders and VTRs to provide multiple micro- phone inputs. The Model M67-2E Professional Microphone Mixer

3、 is similar to Model M67 except that it is designed to be connected to a 216-264 volt AC power line. All information on the data sheet for the Model M67 applies, except for those references to AC operating voltage and power-line cord. Features include: Wide, flat frequency response and low distortio

4、n at up to $ 18 dbm output. Extremely low noise and RF susceptibility. Four low impedance balanced-line microphone in- puts with individual gain controls. Mumetal shielding on input transformers. Line input switchable for 600-ohms terminating, or bridging. Outputs, 600-ohm line and low impedance mic

5、ro- phone level. Outputs may be used simultaneously. VU meter calibrated for +4 and + I 0 dbm with range switch. Illuminated with AC operation. Meter isolated from DC on line. Line output trans- former unaffected by up to I00 ma DC. AC or battery operation (with accessory battery pack). Noiseless au

6、tomatic switch-over to battery in event of AC line failure. Battery test provision. Low frequency roll-off switch on each channel. Two-level headphone monitor provision designed to accommodate 600 to 2,000 ohm headphones. Any headphones from 8 ohms to crystal may be used. Direct mix bus input for st

7、acking units. Line output terminals phase indicated. All connec- tions phased. Compact, lightweight. U.S. Underwriters Laboratory and Canadian Standards Association approval for use in com- mercial applications. (Applies to Model M67). Guarantee: This Shure product is guaranteed in normal use to be

8、free from electrical and mechanical defects for a period of one year from the date of purchase. Please retain proof of purchase date. This guarantee includes all parts and labor. Shipping Instructions: Carefully repack the unit and return it prepaid to the factory. If outside the United States, retu

9、rn the unit to your dealer or Authorized Shure Service Center for repair. The unit will be returned to you prepaid. SPECIFICATIONS PERFORMANCE Frequency Response: 1-2 db from 30 to 20,000 Hz. Gain: (Outputs terminated; line 600 ohms, rnicro- phone 150 ohms). Gain will decrease a maximum of 5 db with

10、 nearly exhausted battery. Input I Line I i;rophone - - Low lmoedance Microhone 1150 ohms) / 90 db 1 30 db - Line, Bridging or Terminating 140db 1 -20db Noise: Equivalent input noise: -129 dbV (low im- pedance microphone, 150 ohms -300 to 20,000 Hz.) into 600-ohm load, at full gain. Equivalent input

11、 hum and noise: -125 dbV (low im- pedance microphone, 150 ohms- 20-20,000 Hz.) into 600-ohm load, at full gain. Distortion: Under 1% T.H.D. from 20 to 20,000 Hz. at + I 0 dbm out (0.5% Typical). Control Interaction: Under 1% db with any control . - com bination. INPUTS Impedance Input 1-d for c t u

12、a l I Input Clipping -30 dbV (150 ohms) Greater than +22 dbV - Line.Terminated I z: OWK;: 1 600 ohms I Greater than +24 dbm Minimum Common Mode Rejection: 100 db with microphone input of I 0 volts at I00 Hz. OUTPUTS Impedance Output Designed For Actual Output Clipping Use With (Internal) Level Micro

13、phone Any low 0.5 Ohms 6 rnv, - 4 4 dbV Line impedance microphone *Other line impedances may be used; however, the VU meter is calibrated for 600-Ohm line termination. See VU Meter Section on Page 3. Headphone Output: See Headphone Section on Page 3. Temperature Range: Operating: OF to 135OF (-17.8O

14、C to 57OC) Storage: -20F to 160F ( -29OC to 71 O C ) Copyright 1970. Shure Brothers Inc 27A954 (LI) Printed in U.S.A. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Master Gain Control: The front panel control designated Master is the master gain control and controls the overall output level of all

15、 the mixed sources (including signals which may be applied to the Mix Bus input). VU METER Range: The VU meter is factory calibrated for use with a 600- ohm terminated line. The VU Range Switch above the master gain control selects either a +4 or i- 10 dbm o u t u t at 0 VU meter indication. (This s

16、witch changes he meter indication, and does hot change the actual output level.) Microphone output levels are 60 db below line output. The t 4 range is recommended for normal use t o pro- vide 14 d b margin from operating level to clipping level. The VU meter is calibrated with no load on the head-

17、phone output. Low impedance (under 250 ohms) phones may have some loading effect and alter the VU calibrations slightly. If the use o f such phones appears to be normal, (or if other than a 600-ohm terminated line is used) it may be desirable to recali- brate the VU meter by means of the VU Cal. con

18、trol (see Figure D.) (Range of this control is approximately 2 db.) Illumination: The VU meter is illuminated by two No. 47 lamps operating well under the normal ratings for a life expectancy of greater than 10,000 hours. The lamps are used only with AC operation. Consequently, when a battery supply

19、 is used as a safety stand-by, the illumination serves as a visual alarm if the AC is inter- rupted and the unit has switched to battery. For lamp replacement instructions see Figure E. DC Isolation: The VU meter is connected on the primary side of the output transformer t o assure protection from a

20、ny D C level on the telephone line. (See OUTPUTS, LINE) TONE OSCILLATOR A built-in tone oscillator is provided for line test and level checks. The tone oscillator is activated by setting the Mic. I/Tone Osc. switch (rear panel) to Tone Osc. and may then be controlled in level by control Mic. l /Tone

21、 Osc. (on the front panel). The fre- quency is approximately 700 Hz. and the signal will appear on both line and microphone outputs as well as the headphone and mix bus connectors. The oscillator should be switched off (Mic. I position) when not actually in use. LO-CUT FILTERS These filters are acti

22、vated by the switch above each of the individual channel level controls, and may be used individually with each control as needed. The typical response function is shown in Figure B. The Mic. 4/LineW filter will operate with either micro- phone or line input. FREQUENCY IN HERTZ TYPICAL LOW-CUT FILTE

23、R ACTION FIGURE B HEADPHONES The headphone output appears on the rear panel and i s designated Headphones. A two-circuit phone jack is used t o provide a choice of level for different head- phone impedances. Normally, a single circuit plug should be used. If inserted only partially (to the first det

24、ent), the available voltage is approximately .I8 volts into 1,000 ohms with 4-4 dbm out of the Line Out terminals. With the same operating conditions the second position will provide approximately .38 volts. These voltages are selected for normal operation with 600-ohm t o 2,000-ohm headphones. Othe

25、r headphone imwedances mav be used. but with a variation in the mdnitor level and the pos;ibility of a slight amount of VU meter loading with very low impedance phones. (Maximum change is 0.5 d b with headphone jack shorted.) If stereo phones are used, the two-circuit plug may be inserted completely

26、 (to second position) and output will appear in both phones. The Tip connection of the headphone plug will be in phase with Pin 3 o f all input and output connectors, and with the tip of the mix jack. MIX BUS Direct access t o the mixing bus is provided through the Mix Bus jack (phono type) on the r

27、ear panel. This provision is made primarily t o facilitate stacking (or multing) of M67s t o achieve additional input capacity without losing any inputs. With two M67s, for example, the two mixing buses are directly connected, providing two independent masters and two isolated line amplifiers with e

28、ight individually controlled inputs. Since the buses are directly paralleled, a 6 db level drop will occur, but the VU meter indication will still be correct. Noise speci- fications are not adversely affected by this intercon- nection. The input clipping level t o the mixing bus is 0.2 volts through

29、 3.5 K ohms. The gain from mix bus input t o line output is 70 db, and from 150 ohm microphone t o mix bus is 20 db. To facilitate stacking, a hardware and cable kit is avail- able as Shure Accessory Model A68S. If other use of this provision is contemplated, it should be remembered that the mix bus

30、 terminal is con- nected directly t o the mixing bus and operates at 3.5 K ohms impedance, hence connecting devices should have at least 3.5 K ohms internal impedance. RadioFans.CN 收音机爱 好者资料库 BATTERY OPERATION Battery Supply The M67 is designed so that it may be operated with an external battery or

31、well filtered DC supply pro- viding 30 Volts DC. Current drain is under 6 ma. at + I 0 dbm output level. The DC input terminals are located adiacent t o the power cord on the rear panel and are designated 30 Volts DC -I- and -. The use of battery supplies designed for the M67 (see Accessory List) is

32、 recommended both for convenience in connecting and mounting and t o permit use of the automatic power change-over feature. Automatic Power Change-Over When used with Shure accessory power supplies, the M 6 7 may be operated from the AC power line with the battery supply connected. In this configura

33、tion, the unit will automatically switch t o battery operation should AC voltage fall below a suitable level. This change-over is completely automatic, instantaneous, and completely noiseless. Should line power fail completely, the VU meter lamps will extinguish, providing a visual indica- tion of t

34、he line failure. If use of a 30-volt DC supply other than Shure Battery Supplies is desired, the automatic change-over feature may be retained b y connecting a suitable silicon diode (Shure RKCPI) in series with the positive lead. The cathode (band) end connects t o the +30-Volt DC terminal. Battery

35、 Check Battery condition may be determined by use of the Battery Check position of the main power switch adjacent t o the VU meter. This check must be made with the AC line cord disconnected. The check pro- cedure is as follows: With the AC line cord disconnected, leave power switch in ON position f

36、or at least ten seconds (to discharge filter capacitors), then move switch up t o Battery Check. Observe reading on VU meter. A new battery will give about a +2VU Indi- cation. Battery condition is good if meter indica- tion is above 0 VU (red end of scale). 0 VU or below indicates that battery must

37、 be replaced for proper operation. For best performance on battery operation at temperatures below 40 F., change batteries when Battery Check meter reading is I .O VU or lower. NOTE: This check interrupts power t o the ampli- fiers, and therefore, should be made only when the unit is not in operatio

38、n. DC Power Take-Off With AC operation, the 30-Volt DC terminals are energized with polarity shown and may be used to power up to two additional M67s or other 30-volt DC low drain accessories. ACCESSORIES A67B Battery Supply This unit is designed t o power the M67 at full rated output. Battery life

39、is approximately 70 hrs at + 10 dbm and 85 hrs at +4 dbm output at 4 hours use per day. See temperature note below. It may be used either as the sole power source or as a stand-by safety during AC operation, providing automatic, noiseless switchover in case of AC failure. The housing is designed t o

40、 attach t o the M67 as shown in Figure C, and is attached by removing one of the M67 cover screws, positioning the battery supply over the hole, and fastening the two together with the screw. The battery complement is three Eveready 2 16s or equivalent 9-volt batteries. Earlier models of the A67B ha

41、d a battery complement of three Burgess U201s, Eveready 413s or equivalent 30-volt battery. NOTE: Due to changes in the operating characteristics of carbon-zinc batteries at low temperatures, the useful operating life will be noticeably shorter at lower than normal room tempera- tures. See Battery C

42、heck Instructions. A67B INSTALLATION FIGURE C A67H HandleiTilt Stand The Model A67H is designed to provide a convenient means for tilting the M67 to permit better panel visibility and greater ease of operation. In the locked position the front panel is elevated 20. In the free position, the A67H ser

43、ves as a rugged carrying handle. A68P Phono-Preamplifier The A68P is a monaural pre-amp which may be used to convert the bridging line input of the M67 for use as an equalized phono input. It provides both equali- zation and preamplification, and is powered from the 30-volt D C power take-off provis

44、ion. (The A68P is supplied with a phono plug which must be replaced with a Cannon XL3-I2 type connector. Pin 3 center conductor, pins 2 and I shield) A68S Sfacking Kit This accessory consists of brackets for vertical stacking of two M67s, and the interconnecting cable for the mix bus connections. A6

45、8R Rack Panel Kit This kit consisis of a 19x31/2 precut rack panel and necessary hardware for rack mounting of the M67 with its cover in place. A68L Locking Panel This panel fits within the front hood of the M67 cover and locks in place to prevent tampering with the front panel controls. AC60 ttach:

46、 Carrying Case This case is compartmentalized and foam lined for an M67 and accessories. * IT IS NECESShRI TO YELLOW DISCONNECT, PIT ONE END ONLY, THE THREE WIRES B CAPACITOR PRINTED CIRCUIT MARKED I TO ALLOW BOARD TO TILT 90. UP BOARD ASSEMBLY FOR SERVICING FIGURE D PI 2 RKCtP 1 NPN TWNSISTOR, 86A3

47、36, SILICOn, TEXAS IWSTRWNT TIS97. 013. RIC65 1 NPN TRANSISTOR, 86A334, SILICW, TEXAS INSTRUIEm T1592. 414. RKCSG 1 PNP TRANSISTOR, 86A331, SILICMI, TEXAS IHSTRWEWT T1593. RKC-1 NOT SH3M( RKC20 1 CHASSIS COVER. K1 - K4 RICE 1 BUCK KM8 R9,RlS,R?3, R35,R44 IK5 RKC6T t GRAY W O B I . TO INSURE LOW NOlS

48、E FIGURE, PURCHASE REPUCMENIS FOR 41-a11 FROl SHURE BROTI(ERS, IIICORPOR*TED. FOR REPLACEMENT, PURCHASE 413 AND 411 AS MTCHED PAIR IIS92LCTIS93H. LAMP REPLACEMENT 3 . DISCOPMECT A.C. CORD. 2. REMOVE 4 PHILLIPS HEAD SCRNS RETAINING COYER - ONE ON FRONT, ONE Oi BACK, WO ON BOTTDI. 3. REMOVE COVER. R I

49、 U 4. REMOVE VU MTER AS FOLLOWS: i l R S T DETEWINE W l C l i TYPE W SPRINT. RETAINER I S USED. W I R E - T SPRNG RETAINER UN BE IDENTFED BY APPEARANCE SIMILAR 70 mi iN rIGu& E 4 STRAP-TYPE SPRING RETAINER I S A BAND OF SPRlNC MATERIAL ABOUT 1/2 WIDE. 5. MAKE A PENCIL MARK ON THE INSIDE TOP PURFACE OF EACH METER BRACKET 10 &ID REASSEMBLY. REMOVE SPRiNG RETAINER. I F A rllRE-TYPE RETAINER 15 USED, PUSH D&% CN EITHER EN0 OF THE WIRE AND UNHOOK I T FRW MLTER BRACKET. I