Dukane-1A731-mix-sch维修电路原理图.pdf

SECTION 1GENERAL INFORMATION1.1 INTRODUCTIONThis manual provides installation and service information for the Dukane Model lA729 60-WattIn-Wall Amplifier, and the Dukane lA731 120-Watt In-Wall Amplifier. These amplifiers aremanufactured by Dukane Corporation, St. Charles, Illinois 60174.This manual is divided into three sections, as follows:1. General Information.2. Installation Information.3. Service Information.1.2 GENERAL DESCRIPTIONThe Dukane Models lA729 and lA731 transistorized in-wall amplifiers are designed for use ascomplete sound distribution systems providing standard 25-Volt or 70-Volt speaker line output,input facilities for up to eight microphones, a radio tuner and phono input. These amplifiers havea power output of 60-Watts and 120-Watts respectively. An Octave Filter (438-496), Compressor(436-408). Dual Microphone Expander (438-407). and Remote Volume Controls may be installedas options at the output for improved sound reproduction. Terminals are provided for each option.1.3 TECHNICAL SPECIFICATIONSPower Output:MODEL lA729: 60-Watts (RMS)MODEL 1A731: 120-Watts (RMS)Distortion:Less than 2% at rated power output,from 40 to 20 kHz.Frequency Response:40 to 20 kHz 2dB. Envelopemeasuredat -6 dB from full output on 70 V line.Power Source:105-125VAC. single phase, 50-60 Hz.Power Required:MODEL 1A729: 150 Watts at rated out-put, 30 Watts at idle.MODEL 1A731: 240 Watts at rated out-put, 40 Watts at idle.Fuse:MODEL 1A729: (1) 1.5 Ampere Slo-BloMODEL 1A731: (1) 3 Ampere Slo-BloNoise Level:Microphone: Better than 60dB downfrom 300 uV referenceinput.Auxiliary: 75 dB below output.Inputs:(4) microphone, low impedance(4) optional microphone inputs(2) auxiliary high impedance inputsInput Sensitivity:Microphone: 300 uV maximum.Auxiliary: 0.4 V rms.l - lRadioFans.CN 收音机爱 好者资料库?2.3.2 Option MountingThe option packages available have complete instructions and hardware included for mounting andconnections. See individual packages for related literature.2.3.3 Amplifier MountingMount the amplifier chassis into the backbox using the four #10-24 studs and nuts supplied(Figure 2-l). DO NOT install the Front Door Panel at this time.2.4 ELECTRICAL CONNECTIONSCut all wires to length and strip wire ends as required. Make all external connections to screwterminals on strips inside this unit (Figure 2-2).CAUTIONConnect AC power to this amplifier AFTER all connections have been completed.2.4.1 GroundingIt is good practice to ground this amplifier to the backbox which is, in turn, connected to theconduit and electrical ground (street-side of meter, cold water pipe). To be sure grounding existsbetween the unit and the backbox, place an outside toothed lockwasher under each mounting nut.2.4.2 Balanced Microphone InputsConnect microphone center wire to MIC 1 and the shield side of the wire to the center terminalmarked SH (Figure 2-3). Connect the second microphone to MIC 2, and the shield to the centerterminal. Use only shielded wires for microphone connections.Figure 2-3. Balanced Mic Center Connections.2-4RadioFans.CN 收音机爱 好者资料库2.4.3 Singleended Microphone InputsConnect the microphone center wire to a microphone input MIC “N” and the shield to the SHLD center terminal with a jumper wire from SHLD to the unused MIC terminal (Figure 2-4).IF ;SEDFigure 2-4. Single-Ended Mic Connections.Connect all unused microphone inputs to the shield common terminal (Figure 2-5).SHLDFigure 2-5.2.4.4 Auxiliary Program InputUnused Mic Connections.Connect the auxiliary program input (from AM/FM tuner, phono, or tape player: to AUX 1Connect the shield to the center terminal (Figure 2-3, 2-4).NOTEA second auxiliary program input can be connected to AUX 2 terminal withthe shield connected to center terminal. Either auxiliary program can thenbe selected by the front panel controls.2-5 2.4.5 OutputFor all single-ended operation connect common to ground (Figure 2-6). Other terminals (8, 16Ohms; 25, 70 Volt) are used for present output circuits.Figure 2-5. Speaker Line Connections.2.4.6 Amplifier ModificationsCertain custom modifications to the in-wall. amplifien can be made if desired. Refer to Figure, 2-7for information.2.4.7 PowerCAUTIONSet all volume controls to “0” before switching on AC Power. NEVER turnup the amplier without an output load; e.g. speakers (matched).Plug in the 3-prong AC power plug into the receptacle on the handi-box within the back-box (Figure 2-l).The SO-Watt amplifier is protected by an externally removable 1.5 Ampere slo-blo fuse and eninternal 3 Ampere slo-blo fuse. The 120-Watt amplifier is protected by an externally removable3 Ampere slo-blo fuse (Fig. 2-2). and an internal 5 Ampere slo-blo fuse.2-SRepair Parts List - Chassis Mounted Parts (1A729)Legend Description Dukana Part No.C103, C104C105, C106,C l 0 7C108, Cl09C l 1 0Cl11C112C113CR101F101F102LED101Ml01cl101Q102R101, R102R103, R104R105R107, R109R108R112R113R114R115-R122R123, R124S101S102S103T101T102Capacitor, 65OOuF. 50WVDC, Lytic 199-2030-658Capacitor, .OluF, 14OOWV. Disc Car. 199-9255Capacitor, 25OuF. 5OWVDC, Lytic 199-2048-257Capacitor, .015uF, lOOWVDC, Mylar 199-4043-l 53Capacitor, 2OOOuF. 5OV. Lytic 199-2048-208Capacitor, .033uF, lOOV, Mylar 199-4043-333Capacitor, 6.8uF. 35V, Tant. Lytic 199-2036-685Rectifier 595-74Fuse, 1.5 Ampere, 125V320-010-0150Fuse, 3.2 Ampere, 125V, 3AG 320-019-0320Diode Light Emitting 230-8004-001Meter VU 485-2014Transistor, Power; 2N5882 720-39Transistor, Power; 2N5880 720-109Resistor, 1OOK Ohm, l/2 Watt, 5% 600-0073-104Resistor, 750 Ohm, 1/2 Watt, 5% 600-0073-751Resistor, 910 Ohm, l/2 Watt, 5% 600-0073-911Resistor, .22 Ohm Wire, 5 Watt, 5%. WW600-1050-R22Resistor, 20 Ohm Wire, 3 Watt, 10%600- 1050-200Resistor, 15 Ohm, 5 Watt, 5% 600-1050-150Resistor, 100 Ohm, 5 Watt, 5% 600-1050-101Resistor, 1800 Ohm, 1 Watt, 5% 600-01 IO-182Resistor, 620 Ohm, l/2 Watt, 5% 600-0073-621Resistor, 51 Ohm, l/2 Watt, 5% 600-0073-510Switch, Toggle SPDT 680-733Switch, AC Output 680-720Thermostat 7 0 2 - ITransformer, Power 710-4239Transformer, Audio Output 710-2163Power Cord 200-204Knob 440-303Receptacle, Crimp Style, 3 Terminal 597-240-0003Receptacle 597-240-00043 - 4