NAD-C272-cd-sm维修电路原理图.pdf
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1、NAD SERVICE MANUAL C 272 STEREO AMPLIFIER C 272 STEREO AMPLIFIER RadioFans.CN 收音机爱 好者资料库 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 Distorti
2、on = 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 o
3、hms 50Hz) Input Impedance R = 20 kohms C = 470 pF Input sensitivity (for rated output into 8 ohms) 1.2 V0.1V Voltage gain 29 dB Frequency response 20 Hz 20 kHz 0.3 dB - 3 dB at 3 Hz/70 kHz Signal / Noise ratio, A-weighted 100 dB ref. 1 W 120 dB ref. rated power BRIDGED (MONOPHONIC)MODE CONTINUOUS AV
4、ERAGE POWER 330 W 25.2 dBW) 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
5、14.2 kg ( 31.3 Ib) Dimension (W H D) 435 133 350 mm RadioFans.CN 收音机爱 好者资料库 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
6、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 67.5mV reading on meter. 2. C
7、onnect a DC Millivoltmeter to R Channel TP4 (IDL) and TP6 (IDL), then adjust VR402 (500 ohms) for 67.5mV reading on meter. II. ISC ADJUSTMENT (WITH LOAD CONNECTED) 1. Connect a DC Millivoltmeter to Power Board CB725, and connect 4 ohms load to both L&R speaker output terminals. Then feed 20kHz signa
8、l to Fixed In RCA. 2. Turn unit ”ON” and try to get 15W on speaker output terminal. Then adjust VR701 (82kohms) to get a reading of 0V+/-10mV. 3. Change the load to 8 ohms and try to get 160W on speaker output terminals. Then adjust VR701 (82kohms) to get a reading of 1.4V+/-30mV. III. FINAL ADJUSTM
9、ENT Repeat procedure A and B for offset voltage and idling current alignment respectively. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 DRAFT C702 22n/250VC703 22n/250VC715 C716 Q703 C1815 Q702 A1015 TC701 TIC116D TC702 TIC116D R707 1K R713 22K R709 100 R7111K R712 1K R708 1K R710 100 R714 22K R7
10、16 0.025/3W 10% R717 100 MF 1% Q706 A1015 Q707 A1015 R718 9K1 MF 1% R719 220K ! ! ! ! RED GRY BLK ORG VIO ! ! ! ! H1 H2 L1 L2 52.1V AC 10% 10% 33.1V AC C704 22n/100V C705 22n/250V ! 10% 10% 32.5V AC C711 22n/250V C712 22n/250V R701 R702 R703 R704 C721 22n/100V C722 22n/100V C723 1000u/100V C724 1000
11、u/100V R721 1K R722 1K R723 33/FS R726 1K R725 1K R727 1K R730 1K R728 1K R735 3K3 1%MF R732 1K R731 1K8 R734 9K1 1%MF R724 33/FS R733 1K R737 22K 1%MF C728 100u/25V C732 10u/100V C733 4u7/100V C729 100u/25V C737 22u/100V C734 22n 100V C731 47P C730 47P C735 22n 100V Q708 KSC2690 Q710 C1775 Q711 C17
12、75 Q709 KSA1220 Q712 A872 D703 1N4148 D704 1N4148 D706 1N4148 D705 1N4148 C725 47u100V C726 47u/100V R736 22K 1%MF C736 22u/100V ! ! ! 60.5V AC T701: TI-65381: AC 230V AC S1 AC S2 + + - - B703 DB104 AC S1 AC S2 + + - - B704 DB104 AC S1 AC S2 + + - - B701 KBU1004 AC S1 AC S2 + + - - B702 KBU1004 C713
13、 22n/250V C714 22n/250V D702 1N5401 10A10A 0.5A0.5A Q704 A1015 Q705 C1815 R715 22K C717 C718 C719 N.I. C720 N.I. 1 2 3 4 7 8 9 5 6 10 11 12 T701 MAIN TRANSFORMER 1 2 3 4 5 CZ702 5PIN 1 2 3 4 5 CB702 5PIN 1 2 3 4 5 CZ701 5PIN 1 2 3 4 5 CB701 5PIN R720 100 R729 100 C727 0.1u FUSEABLE : 4 X 1/1W AC-DET
14、 ISC-C ISC-S 4X10000uF/80V +20%/-20% C715-C718 +18V R742 249 R743 249 R740 3K32 R741 3K32 C744 22u/50V C745 22u/50V C746 22n 100V C747 22n 100V IN IC702 LM317M IN IC703 LM337M C740 22n 100V C741 22n 100V +18V -18V C738 2200uF/50V C739 2200uF/50V C742 10u/50V C743 10u/50V D7071N4148 D7081N4148 1 2 CB
15、703 2PIN C706 0.1u ! AC S1 AC S2 + + - - B705 DB104 C708 1000u/16V C707 0.1u R706 10K 1 4 56 7 9 10 2 8 T702 STANDBY TRANSFORMER PJ701 +12V TRIG R705 2K2 Q701 C1815 1 2 3 SW702A AUTO TRIG 12 RL701A STAND-BY RL701B 5V D701 1N4148 IN IC7017805 C710 0.1u C709 10uF TGND 1 2 3 4 CZ706 4PIN 1 2 3 4 CZ706A
16、 4PIN 1 2 CZ703 2PIN F701 T4AL/250V(CE) R738 200/1W FS R739 200/1W FS R740-R743=1% MF YEL BLU WHI BLU YEL 1 2 CZ704 2PIN +T5V +T5V TGND R749 10K D710 1N4148 R758 100K 1% MF R759 91K 1% MF R757 62K 1% MF R756 390K 1% MF C753 10u/25V R754 1K C750 10u/25V R755 1K C751 10u/25V IC704A TL082CP C752 10u/25
17、V R751 1M IC704B TL082CP R745 27K MF R752 1M C748 1u/50V C749 1u/50V R750 10K D711 1N4148 R746 270K 1% MF D712 1N4148 R748 100K R753 100K 1% MF -18V D709 1N4148 -18V +18V ISC-S ISC-C R772 56K R773 56K C758 330u/16V C756 4u7/100V C757 220n/63V R764 10K R769 56K C755 47u/50V 1 2 3 4 5 6 7 8 IC705 uPC1
18、237HA +V34 R771 22K R770 22K D719 1N4148 D718 10V Q715 A1015 C754 10u/50V R762 22K R763 10K R765 10K R768 10K D713 1N4148 RL702B 36V R766 220/2W FP L-OUT R-OUT R767 5K6 +V34 PROTECT-I PT-OUT AC-DET +5V 1 2 CB707 2PIN 1 2 CB708 2PIN LA G1 G2 RA LB G3 G4 RB CB715 BINDING POSTS 12 RL702A RL-LCH 12 RL70
19、3A RL-RCH 1 2 3 4 5 6 7 8 CZ709A 8PIN 1 2 3 4 5 6 7 8 CZ710A 8PIN C759 22n 100V C760 22n 100V C761 2n2 C762 2n2 L-OUT R-OUT +64V -64V 1 2 3 SW704A BG-SIGNAL PROTECT-I 1 2 3 SW703A SOFTCLIP 10 11 12 SW704D BRIDGE 1 2 3 CZ711 3PIN +18V R779 10K R777 10K R774 4K7 D722 1N4148 D721 1N4148 D720 1N4148 R77
20、5 560 R778 4K7 R776 0 Q716 C1815 Q717 C1815 1 2 3 CZ712 3PIN +18V +18V PT-OUT 4 5 6 SW702B AUTO TRIG +5V Q714 C1815 Q713 C1815 R761 22K R760 22K PROTECT-T PROTECT-T ISC-C R783 25K R782 25K R785 1K R784 1K R781 1K R780 1K +68V -68V C764 10u/25V C763 10u/25V D71424V D71524V 4 5 6 SW703B SOFTCLIP +64V
21、-64V +18V +68V -68V R744 100 Q718 C1815 R786 22K D716 1N4148 +18V -18V C270 STANDBY BOARD LOUT GND +64V -64V -64V +64V GND ROUT MUTE-L MUTE-R POS90 POS90 POS80 POS80 SC-P SC-P SC-N SC-N OVERI-S OVERI-S -68V -68V +68V +68V BG-O BG-S1 2 CZ714A 2PIN BG-G 4 5 6 SW704B BG-GND 1 2 CZ713A 2PIN LIN GND 1 2
22、3 4 5 6 7 8 9 CZ61 9PIN R612 1K C62 100P R62 220 MF R64 2.2M MF Q62 2SK369 R68 1K MF R610 100/MF Q65 2SA970A Q68 2SD667A Q66 2SB647A D63 1N4148 D64 1N4148 C64 39P R62010/MF C68 0.1u C67 0.1u MGND 1 2 3 4 5 6 7 8 9 CB61 9PIN MLO +18V LOUT LIN- LIN+ GND RIN+ RIN- ROUT -18V R618 47/MF R616 0 R614 10K M
23、GND +18M -18MMGND MLOMRO R621 N.I. C611 N.I. MR-FB C270-INPUT BUFFER R66 N.I. 1% MF C610 47P R611 1K C61 100P R61 220 MF R63 2.2M MF Q61 2SK369 R67 1K MF R69 100/MF Q63 2SA970A Q67 2SD667A Q64 2SB647A D61 1N4148 D62 1N4148 C63 39P R619 10/MF C66 0.1u C65 0.1u MGND MRO R617 47/MF R615 0 R613 10K MGND
24、 +18M R65 N.I. 1% MF C69 47P MR-FB -18M ML-FB ML-FB -18M RIN GND2SA1943 BCE 2SA1943 2SA872 2SA1015 2SC1815 A872 E C B B649 TL431 LM317: R A K E C B TL431 2SB649 2SD669 3:IN LM337: 1:ADJUST,2:IN, 1 2 3 LM7805 LM7805 1:IN 2:GND,3:OUT 2SC5200 R101 220 MF C101 100P R102 2M2 RCA1A FIXED-L R201 220 MF C20
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