Bogen-CT35-pa-sm维修电路原理图.pdf

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1、A DIVISION OF LEAR SIEGLER, INC. AMPLIFIERS Models CT 35/60/100 Bogen Acousta-Master CT Series Public Address Amplifiers are versatile, silicon-transistor preamp-mixer- amplifiers designed for professional-quality sound reinforce- ment requirements. Model CT-35 is rated at 35 watts, Model CT-60 at 6

2、0 watts and CT-100 at 100 watts output. Four high-impedance microphone inputs are provided, each convertible for use with low-impedance microphones. A simple modification converts inputs to low-impedance unbalanced; balanced inputs require accessory plug-in transformers. Two mic inputs and one auxil

3、iary input may be remotely controlled or muted for announcements over another mic channel. The same two mic inputs may be con- verted to accept a magnetic source, i.e., turntable or tape player. Two auxiliary inputs with fader control are pro- vided, as well as a bridging input. Acousta-Master ampli

4、fiers feature the Bogen built-in acoustic equalizer filter circuit, which provides a means of boosting or attenuating any of five selected frequencies to suit individual room acoustics. An electronic limiter circuit provides uniform output regardless of wide variations in the input level. With this

5、capability, all paging calls can be transmitted with the same volume and clarity. An output terminal strip and connectors at the rear of the amplifier provide standard speaker impedance taps, as well as connections for 25volt or 70-volt balanced lines. There is also a bridging output for feeding a t

6、ape recorder. Bogen accessories provide the amplifier with telephone line input and output connections, remote volume control, and channel override facilities. Further information is contained in the Accessories section. The amplifier operates from a 105-125 volt, 50/60 Hz source. A three-prong line

7、 cord provides automatic ground- ing when connected to a three-wire power outlet. The power line is protected by a circuit breaker, and the output transistors by a thermal overload device, which shuts off the unit when the temperature of the heat sink rises excessively. INSTALLATION UNPACKING The am

8、plifier was carefully checked before leaving factory. Inspect shipping container and unit carefully for indications of improper handling. If the unit has been damaged, make an immediate claim to distributor from whom it was purchased. If the amplifier was shipped to you, notify transportation compan

9、y without delay and place your claim. POWER AND GROUNDING The ac line cord has a three-prong plug which should be plugged into a three-wire grounded, 120 volt, 60 Hz outlet. As it is important to ground the amplifier, where a three- wire outlet is not available, use an adapter (e.g., Leviton No. 501

10、7) and connect the grounding pigtail to the screw securing the wall plate. If the wall plate screw is not ground- ed, connect a wire from the GND terminal of the amplifier to a suitable ground. AUXILIARY POWER The auxiliary power receptacle on the rear chassis (see figure 1) is a three-wire grounded

11、 outlet, which can supply power to accessory sound equipment. When connecting associated equipment with a three-prong cord, appropriate grounding is accomplished when the amplifier line cord is properly grounded. Use the ON/OFF switch on the phonograph for turning off a record player connected to th

12、e auxiliary receptacle, as use of the amplifier power switch could cause flats to develop on the idler wheel of the phonograph. Be sure that the auxiliary components do not draw more than 250 watts on the CT35 and CT 60, and 500 watts on the CT1 00. Prmted i n USA 8104 54-5629-l 4 RadioFans.CN 收音机爱

13、好者资料库 TECHNICAL SPECIFICATIONS I CT35 I CT60 I CT100 I POWER OUTPUT (RMS at 1000Hz) FREQUENCY RESPONSE REGULATION 35 watts I 60 watts I 100 watts less than 2% total harmonic distortion 50Hz to 15kHz 2dB 2 dB HUM AUX 70 dB; Fundamental, 80 dB SENSITIVITY (for rated output) Hi Z MIC, 3 mV; Low Z Bal M

14、IC, 0.3 mV; Low Z Unbal MIC 0.3 mV; Bridging Input, 30 mV; AUX 150 mV OUTPUTS 4, 8 ,16ohms 8,16ohms 25V CT 25V CT 7ov 7ov I 4, 8, ,16ohms 25V CT 7ov I Bridging, 30 mV; Tape, 0.68 V. TAPE/BOOSTER/BRIDGING outputs, 500/6OOa telephone line input or output with WMT-i optional accessory. I OUTPUT CONNECT

15、IONS I 2 Quick disconnect type sockets with plugs provided, in addition to screw-type terminals, tape/booster jack, and provisions for WMT-1. I INPUTS CONTROLS 4 Hi Z MIC inputs, each convertible to Low Z Bal or Unbal MIC; 2 AUX inputs with fader control; MIC 1 Bridging input; 500/600 ohm telephone

16、line with optional WMT-1 accessory; 3 inputs for remote volume control. 4 MIC Volume, AUX 1, AUX 2-fader, MASTER VOLUME, 5 Equalizer Filter Slide Controls. 1 Compressor. 1 Power Switch. FILTER CONTROL ACTION 10dB Bvariation at the following frequencies:80 Hz, 300 Hz,1 kHz,3kHz,10kHz. COMPRESSION 5 m

17、illiseconds attack time, 2 seconds decay time, max. compression 30 dB LINE FUSING I Resettable Circuit BreakerI SEMICONDUCTORS POWER CONSUMPTION 0.93 A Hold 1.65 A Hold 2.5 A Hold 18silicon transistors 18 silicon transistors 20silicontransistors 2 Zener Diodes; 8 Silicon Diodes (10 in CTl00) 120 V A

18、C, 50/60 Hz DIMENSIONS SHIPPING WEIGHT 0.86A, 96W 16-3/8”W x 12”D x 4”H (41.6cm x 32.4cmx12.lcm) 19 lbs. (8.6 kg) 1.6A, 170w 2.9A, 300W 16-3/8”W x 13 3/4”D x 4 3/4”H (41.6cm x 34.9cm x 12.lcm) 221bs. (9.9 kg) 26 lbs. (11.8 kg) INPUT CONNECTIONS HIGH IMPEDANCE MICROPHONES: The amplifier is shipped in

19、 a configuration for direct connection of high impedance microphones (50k ohms) to the four MIC input receptacles of the amplifier. The microphone lead should be a single-conductor shielded cable under 35 feet long and terminated in a Cannon XLR-311C connector (Bogen Part No. 85-0124-01) as shown in

20、 figure 2. In the event jumpers on the printed circuit board have been rearranged and must be returned to the configuration for direct connection of high impedance microphones, connect the two jumpers involved as follows: the first jumper between terminals 11 and 19, and the second be- tween 8 and 1

21、8. Three jumpers are not involved and are stored by connecting both ends to an assigned terminal: the first jumper on terminal 20, the second on 24, and the third on 25. BALANCED LOW-IMPEDANCE MICROPHONES: Low- impedance accessory transformers are required to permit the amplifier to accept inputs fr

22、om microphones rated from 50 to 600 ohms. Before connecting microphone, insert appropriate plug-in transformers and reset jumpers adjacent to transformer sockets as described in the Accessories sec- tion. Use a two-conductor shielded cable for the + micro phone lead, terminated in a Cannon XLR-311C

23、connector, as shown in figure 3. , - 2 - RadioFans.CN 收音机爱 好者资料库 SPEAKER OUTPUT SOCKETS TERMINALS CIRCUIT TAPE/BOOSTER AUX BREAKER TAPE INPUTS I OUTPUT II I I I WMT-1 OUTPUT I I AUX POWER IMPEDANCE REMOTE/PRECEDENCE SELECTOR TERMINALS BRIDGING I I MIC INPUTS Note: Heat sink for Model CT-35 HEAT SINK

24、 is an aluminum plate. Figure 1 - Rear Panel, CT-100 UNBALANCED LOW IMPEDANCE MICROPHONES: Jumpers with push-on connector lugs are mounted on the printed circuit board assembly for use in converting the MIC input channel circuits. See note 4 on the schematic diagram, figure 6. To convert MIC 1 and 4

25、 for unbalanced low impedance use, connect jumper between pins 20 and 2 1; to convert MIC 2 and 3, connect jumper between pins 25 and 26. As shown in figure 2, connect a jumper between terminals 1 and 2 of the connector and wire microphone to pin 3 of the plug. AUXILIARY INPUTS: Two auxiliary inputs

26、 are provided for high-level, high impedance inputs. these may be used to connect a radio tuner, tape recorder, or turntable utiliz- ing a ceramic cartridge. An input signal of 0.15 volts is required to obtain full output from the amplifier. Use single-conductor shielded cable terminated in an RCA p

27、hono plug for connecting auxiliary component. If hum is experienced after making connections, run a ground wire between the chassis of the auxiliary unit and the GND terminal on the amplifier. BRIDGING: The amplifier may be bridged to a second Bogen CT amplifier to double the number of inputs. Con-

28、nect a single-conductor shielded cable, terminated in an RCA phono plug at each end, between the rear panel BRIDGING receptacles of the two amplifiers. Any input to either amplifier will then be fed through and available at the output of both amplifiers. The amplifiers must each When two amplifiers

29、are bridged together, any adjustment of the MASTER, COM- PRESSION or Acoustic Equalizer controls in one amplifier will not affect the output of the other amplifier. : (CONNECTION SAME FOR MAG PHONO) XLR-311C BALANCED LOW IMPEDANCE MICROPHONE XLR-311C J 2 UNBALANCED LOW IMPEDANCE MICROPHONE XLR-311C

30、feed separate speaker systems. Figure 2 - Connecting Microphone Cable Connector -3- MAG PHONO: The output of a phonograph employing a magnetic cartridge may be connected to the MIC 1 and 4 receptacles on the rear panel. Use a single-conductor shield- ed audio cable terminated in a Cannon XLR3 11C co

31、nnec- tor as shown in figure 2 (connections same as high im- pedance mic). A magnetic tape head may also be connected in this manner. Connect a single conductor shielded cable, terminated in an RCA phono plug at each end, between the rear panel BRIDGING receptacles of both amplifiers. This assures t

32、hat any input will have equal amplification. To provide the necessary equalization for magnetic phono and tape head inputs, the Berg terminal jumpers on the printed circuit board must be connected as indicated in note 3 on the schematic diagram. Connect a jumper be- tween pins 21 and 22 and between

33、pins 23 and 24. AMPLIFIER 1 GND COMI 25VCT AMPLIFIER 2 GND COMl 25VCT OUTPUT CONNECTIONS SPEAKERS: For installations where speakers will be con- nected permanently, output connections are available on the terminal strip at the rear of the amplifier for 4, 8, and 16 ohm speakers and 25volt lines. Con

34、nections may be made for an unbalanced line or for a balanced line with or without center-tap grounding. Make speaker line connections as shown in Table 1. Impedance indicated in Table 1 is also available at two speaker sockets on the rear panel. Two quick-disconnect plugs (Bogen 85-0147-01) are fur

35、nished with the amplifier to make connections to these sockets. Wiring of the speaker output plug is shown in figure 3. When the speaker sockets are used, connect the wired plug to either socket. For un- 1 L+25V ALL UNITS b AMPLIFIER 1 AMPLIFIER 2 GND COM 1 l6n GND COM 1 16n CT60 AND CT 100 A74-2031

36、-01 Figure 4 - Connecting Amplifiers in Series balanced. 4, 8, 16 ohms and 25-volt operation, attach the impedance selector lead to the speaker system impedance Both amplifier tone and master volume controls must be at the same setting to assure that each amplifier will share terminal, and leave the

37、 link connected between COM 1 and GND terminals. A balanced output is available by removing the the load equally. link. For 70 volt constant voltage systems, see Table 1. For detailed information see installation manual No. 54-5001, furnished with the amplifier. To minimize shock hazard, Class I wir

38、ing as defined in local building codes should be used for 70-volt outputs. All other outputs may use Class 2 wiring. CONNECTING AMPLIFIERS IN SERIES: Pairs of Bogen CT amplifiers of the same power rating can be connected in series to effectively double the power output into the same speakers. See fi

39、gure 4 for connection diagram. Be certain to remove the link between COM 1 and GND of amplifier No. 2. F O R 70V OPERATlON zil-J= FOR 25V OPERATION OR SELECTED IMPEDANCES -! 3c-1- Figure 3-Speaker Output Plug Wiring TAPE/BOOSTER OUTPUT: The amplifier may be used to drive a tape recorder or a booster

40、 amplifier. Connect a patch cord with an RCA phono plug from the TAPE/ BOOSTER jack on the rear panel of the amplifier to the input of the tape recorder or booster amplifier. The output at this jack is controlled by the amplifiers volume and equalization controls. TAPE OUTPUT: A tape recorder may al

41、so be driven from the TAPE OUTPUT jack on the amplifier. In this case, the output is not subject to the master volume and equalization settings of the amplifier and is controlled at the tape recorder. A patch cord terminated in an RCA phono plug is connected between the TAPE OUTPUT jack on the ampli

42、- fier and the input of the tape recorder. WMT-1 OUTPUT: This receptacle is used to accommodate a Bogen accessory which provides connections to a 500/ 600-ohm telephone line. ACOUSTIC EQUALIZER: The Acoustic Equalizer permits you to “tune” the amplifier to the room in which the sound system is used,

43、 so that the amplifier will operate at a substantially higher output before acoustic feedback oc- curs. Five slide controls, located on the front panel, boost or attenuate the output at five selected frequencies-80 Hz, 300 Hz, 1 KHz, 3 kHz, and 10 kHz. Varrying room acous- tics or microphone placeme

44、nt may cause feedback or howl- ing at or near some of these frequencies. If so, feedback can be greatly attenuated by setting the slide control for that particular frequency as described below. -4- TARI F 1-f-U ITPI IT CONNECTIONS ._I_ . _. _. Models CT35 X2 is for MIC 2 input. 7. Use spring clip(s)

45、 to secure transformer(s) in socket(s). 8. Change jumper connections as indicated in the table below. 9. At preamplifier board A2, install low impedance transformer(s) in 9-pin socket(s). XI is for MIC 4 input; X2 is for MIC 3 input. 10. Use spring clip(s) to secure transformer(s) in socket(s). 11.

46、Change jumper connection as indicated in the table below. Transformer Plugged in for: Remove Reconnect Jumper between: Jumper between MIC 1 Conversion Pins 8 96-5 96-5298-01 176-01 Q10 96-5283-01 Q11 96-5357-01 Q12 96-5356-01 Rl 77-001-712 R23 77-00 l-709 R32 77-001-722 R48 75-842-561 R65, 69 76-107

47、-096 R67, 68 76-116-003 PC board assembly Capacitor, electrolytic, 500F, 35V Capacitor, electrolytic, 50F, 50V Capacitor, tantalum, 2.2F, 15V Capacitor, electrolytic, 500F, 75V Capacitor, electrolytic, l0F, 50V Capacitor, Electrolytic, 1 OOF, 50V Diode, 400 piv 1 A Diode, zener, 18V, 2W Diode, zener

48、, 12V, 2W HVR3 Inductor, 150H Inductor, 50H Inductor, 1 5H Transistor, 2N5089 or Transistor, BC 239C Transistor, MPS-65 18 Transistor, SPS-1910 Transistor, MPS-A55 Transistor, 2SD-389 (P) /2SD313D/TIP31A Transistor, 2SB-5 12 (P) /2SB507D/TIP32A Control, aux vol., 2 megohm C.T. Control, comp., 50 kil

49、ohm Control, master vol., 10 kilohm Resistor, 560 ohm, 3W Resistor, .82 ohm, 2W Resistor, .27 ohm, 7W Schem. Ref. Part No. Description Chassis electrical components Cl0679-509-05 1 Cap, electrolytic, 1500F, 79-509-052 79-509-053 Cl07 79-509-O 15 79-509-O 17 79-509-O 19 CBlOl 94-00 17-04 94-00 17-09 94-00 17-15 CB-102 94-00 14-07 CR-101, 102 96-5241-01 CR-103, 104 96-5333-01 1101 94-0302-05 QlOl-106 96-5385-01 96-5397-01 RlOl-105 R108 R109, 110 SW101 TlOl 77-001-723 75-741-101 76-116-003 T102 81-003-057 81-003-053 83-805-000 83-804-000 83-803-000 83-422-000 83-423-000 83-424-000 7