NAD C-272 free download

File name NAD_C-272_service_manual.pdf

C 272 SERVICE MANUAL STEREO AMPLIFIER NAD STEREO C 272 AMPLIFIER SPECIFICATIONS STEREO MODE CONTINUOUS AVERAGE POWER = 150 W (21.8 dBW) OUTPUT INTO 8 OHMS OR 4 OHMS (Min. power per channel, 20 Hz ­ 20 kHz, both channels driven, with no more than rated distortion) Rated Distortion = 0.03% (THD 20 Hz ­ 20 kHz) Clipping power = 170 W (maximum continuous power per channel). IHF dynamic headroom at 8 ohms = +2.3 dB IHF dynamic power (Maximum short term power per channel) 8 ohms: = 230 W (23.6 dBW) 4 ohms: = 410 W (26.1 dBW) 2 ohms: = 520 W (27.2 dBW) Damping factor > 150 (ref. 8 ohms 50Hz) Input Impedance R = 20 kohms C = 470 pF Input sensitivity (for rated output into 8 ohms) 1.2 VЎА0.1V Voltage gain 29 dB Frequency response 20 Hz ­ 20 kHz ЎА0.3 dB - 3 dB at 3 Hz/70 kHz Signal / Noise ratio, A-weighted > 100 dB ref. 1 W > 120 dB ref. rated power BRIDGED ЈЁ MONOPHONICЈ©MODE CONTINUOUS AVERAGE POWER 330 W 25.2 dBWЈ© OUTPUT INTO 8 OHMS (Min. power per channel, with no more than rated distortion) IHF dynamic headroom at 8 ohms 3 dB IHF dynamic power 8 ohms: 800 W (29.0 dBW) IHF dynamic power 4 ohms: 1200 W (30.8 dBW) DIMENSIONS AND WEIGHTS Net Weight 12.5 kg ( 27.5 Ib) Shipping Weight 14.2 kg ( 31.3 Ib) Dimension (W Ч H Ч D) 435 Ч 133 Ч 350 mm ALIGNMENT PROCEDURE (C272) I. INITIAL ADJUSTMENT (No load connected) A. OUTPUT OFFSET VOLTAGE 1. Connect a DC Millivoltmeter to L Channel TP2 (DC) and TP8 (GND). 2. Turn unit "ON" and adjust VR301 (100ohms) to get a reading of 0V+/-30mV. 3. Connect a DC Millivoltmeter to R Channel TP5 (DC) and TP7, then adjust VR401(100ohms) to get a reading of 0V+/-30mV reading on meter. B. IDLING CURRENT 1. Connect a DC Millivoltmeter to L Channel TP1 (IDL) and TP3 (IDL), then adjust VR302 (500 ohms) for 6~7.5mV reading on meter. 2. Connect a DC Millivoltmeter to R Channel TP4 (IDL) and TP6 (IDL), then adjust V