Akai-AM-2850-维修电器原理图手册

AKAINo.1PRELIMINARY SERVICE MANUALM0 DEL AM-2850/2950DATE January,1979I.TECHNICAL DATA1.Mode1 AM-2850POWER AMPLIFIER SECTIONRated Output Power2-Channels Driven95 watts per channel,minimum RMS,at 4 ohmsfrom 20 to 20,000 Hz with no more than 0.08%total harmonic distortion.85 watts per channel,minimum RMS,at 8 ohmsfrom 20 to 20,000 Hz with no more than 0.08%total harmonic distortion.2 x 140 watts into 8 ohms at I kHz,with nomore than 0.08%total harmonic distortion.2 x 100 watts into 8 ohms at 1 kHz,with nomore than 0.08%total harmonic distortion.Frequency ResponseMain in:DC to 100kHz +0dB,-0.5dBPower Bandwidth (IHF)10 Hz to 40 kHz/8 ohms(Total Harmonic Distortion:0.08%)Signal to Noise Ratio (IHF)PHONOBetter than 75 dBAUXBetter than 95 dBResidual NoiseLess than 0.3 mV at 8 ohmsChannel Separation (IHF)PHONOBetter than 50 dB at lkHzDamping FactorMore than 50 (1 kHz,8 ohms)Output SpeakersA,B,C (4 to 16 ohms)/A+B,A+C,B+C (8 to 16 ohms)Headphone4 to 16 ohmsPRE AMPLIFIER SECTIONInput Sentivity/ImpedancePHONOPHONO 1:3mV/33/47/100 kohms,PHONO 2:3mV/47 kohmsAUX150 mV/100 kohmsTUNER150 mV/100 kohmsTAPE MONITORPIN:150 mV/100 kohms,DIN:30 mV/100 kohmsMAIN INPIN:1V/47 kohmsOutput Level/ImpedanceTAPE RECPIN:150 mV/1 kohms,DIN:150 mV/30 kohmsPRE OUTPUT1V/47 kohmsFrequency ResponsePHONO (RIAA equalization)30 Hz to 15 kHz +0 dB,-1 dBAUX,TAPE MONITOR3 Hz to 60 kHz +0 dB,-1 dBTone ControlBASS±9dBat100HzMID RANGE±10dBat1kHzTREBLE±9dBat10kHzLoudness Control+10 dB at 100 Hz,+6 dB at 10 kHz(Volume control set at -30 dB position)FilterHIGH-6 dB at 10 kHzLOW-6 dB at 30 HzAKAI ELECTRIC CO.,LTD.(P.O.BOX 21,Tokyo Airport,Japan)12-14,2.chome,Higashi-Kojiya,Ohta-ku,Tokyo,JapanPrinted in Japan