McIntosh-MA2275-int-sm维修电路原理图.pdf

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1、SERVICE MANUAL Performance Specifications . 2 Notes . 2 Rear Panel . 3 Section Location . 4 Block Diagram . 5 - 7 Interconnection Diagram . 8 - 10 Main Schematic and PCB. 11 - 16 Control Schematic and PCB . 17 - 20 Balanced Schematic and PCB . 21 - 22 Volume/Tone Schematic and PCB . 23 - 26 Data Sch

2、ematic and PCB. 27 - 28 Pushbutton Schematic and PCB . 29 - 30 Amplifier Schematic and PCB. 31 - 34 Power Supply Schematic and PCB. 35 - 38 Meter Schematic and PCB . 39 - 40 Backup PS Schematic and PCB . 41 Terminal Schematic and PCB . 42 Parts List . 43 - 48 Exploded View and Parts List . 49 - 52 R

3、epacking Instructions . 53 CONTENTS TUBE INTEGRATED AMPLIFIER RadioFans.CN 收音机爱好者资料库 PERFORMANCE SPECIFICATIONS 2 1. The heavy lines on the schematic denote the primary signal path. 2. Unless otherwise noted, all voltages indicated on the schematics are measured under the following conditions: a. A

4、C input at 120 volts, 50/60Hz. b. All voltages are +/-10% with respect to ground. A high impedance (10 megaohm) voltmeter must be used. 3. Unless otherwise specified: a. Resistor values are in ohms. b. Capacitor values are microfarads (uF). c. Inductor values are in microhenries (uH). 4. On PC board

5、 drawings, Square pad indicates: a. Polarized Capacitors - Positive b. Diodes - Cathode c. Others - Pin 1 5. WARNING Parts marked with the symbol have critical characteristics. Use only replacement parts recom- mended by the manufacturer. NOTES Power Output Minimum sine wave continuous average power

6、 output per channel, both channels operating is: 75 watts into a 2 ohm load 75 watts into a 4 ohm load 75 watts into an 8 ohm load Rated Power Band 20Hz to 20,000Hz Total Harmonic Distortion Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power output is: 0.5% for a

7、 2, 4 or 8 ohm load Frequency Response +0, -0.5dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 50,000Hz Sensitivity Phono: 4.4mV for 2.5V preamp output High Level: 450mV for 2.5V preamp output Power Amplifier Input: 2.5V for rated output A-Weighted Signal To Noise Ratio Phono Input: 80dB below 10mV i

8、nput High Level: 97dB below rated output Power Amplifier: 110dB below rated output Intermodulation Distortion Maximum Intermodulation Distortion if instantaneous peak output does not exceed twice the rated output, for any combination of frequencies from 20Hz to 20,000Hz is: 0.5% for a 2, 4 or 8 ohm

9、load Input Impedance Phono: 47k ohms, 65pF High Level: 22k ohms Maximum Input Signal Phono: 90mV High Level: 8V Preamplifier Maximum Voltage Output Phono: 8V High Level: 8V Main Out: 8V at preamp output Voltage Gain High Level to Tape output: 0dB High Level to Preamp output: 15dB Wide Band Damping F

10、actor Greater than 18 Power Requirements 100 Volts, 50/60Hz at 3.6 amps 110 Volts, 50/60Hz at 3.6 amps 120 Volts, 50/60Hz at 3.6 amps 220 Volts, 50/60Hz at 1.8 amps 230 Volts, 50/60Hz at 1.8 amps 240 Volts, 50/60Hz at 1.8 amps Note: Refer to the rear panel of the MA2275 for the correct voltage. Prea

11、mplifier Tube Compliment 2 - 12AX7A Phono Circuitry 2 - 12AX7A High Level Circuitry Power Amplifier Tube Compliment 2 - 12AT7 4 - KT88/6550 Overall Dimensions Width is 17-3/4 inches (45.09cm), Height is 10-1/8 inches (25.72cm) including feet, Depth is 18-3/4 inches (47.63cm) including the Front Pane

12、l and Knobs Weight 77 pounds (35 kg) net, 110 pounds (50 kg) in shipping carton RadioFans.CN 收音机爱好者资料库 3 MA2275 TOP AND REAR VIEWS PHONO GND EXT SENSOR POWER AMP IN T 4AL 250V SLO-BLO120V50/60Hz 3.6A PREAMPTAPE OUTPUTS POWER CONTROLSUM DATA PORTS MAINACC SERIAL NUMBER MA2275 McINTOSH LABORATORY, IN

13、C., BINGHAMTON, NY MADE IN USA CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTIONFOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE ONLY WITH SAME TYPE ANDRATING FUSE. CD INPUT INTEGRATED AMPLIFIER LR L R DVDTUNERCD 2CD INPUTS TAPE 12 AVISRISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR. REMPLACER PAR UN

14、 FUSIBLE DE MEME TYPE, AMPERAGE ET VOLTAGE. RadioFans.CN 收音机爱好者资料库 4 SECTION LOCATIONS BOTTOM VIEW WITH COVER REMOVED 510 POWER TRANSFORMER METER PCB OUTPUT TRANSFORMER 3 CONTROL PCB OUTPUT TRANSFORMER VOLUME/TONE PCB 7 PUSHBUTTON PCB 8R8L AMP PCB AMP PCB 11 BACKUP POWER SUPPLY PCB 9 POWER SUPPLY P

15、CB 13 TERMINAL PCB 2 MAIN PCB 12 TERMINAL PCB 6 DATA PCB CHOKE FILTER 4 BALANCED PCB 1 1 1 1 TOP VIEW WITH COVERS REMOVED RadioFans.CN 收音机爱好者资料库 576 MA2275 BLOCK DIAGRAM RadioFans.CN 收音机爱好者资料库 8109 1INTERCONNECT RadioFans.CN 收音机爱好者资料库 111312 MA2275 2AMAIN 049965 SH 1 OF 2 RadioFans.CN 收音机爱好者资料库

16、C20 C58 C43 R96 R95 R23 C15 R6 R15 R5 R4 R11 C2 R17 C16 R35 C31 R1 R10 C42 R44 R3 R12 R43 R45 R27 C32 R42 R64 C53 R73 R72 JMP1 R76 R79 R70 R60 R81 R84 R71 R61 R82 R87 R80 R94 R93 R21 R19 R22 R8 R20 R37 R39 R40 R77 R66 C19 R56 C59 C46 R68 C45 R69 R63 C71C69 C82 R46 C41 C24 C84 C85 C26 C25 C28 C27 C17

17、 R30 R24 D4 R91 GP1 U1 U5 R92 R86 J11 R25 K2 K3 R26R34 C3 R2 C11 C5 R9 C7 R18 R74 C73 R32R28 C35 C36 C33 C40 C37 R41 C30 U3 C34 C1 C6 R14 C8 C12 C86 R16 C10 K21 K1 U4 R29 C68 C39 C38 C29 R33 R38 C67 R62 C56 R59 C50 R83 Q4 Q2 C65 R75 C54 C52 C55 R53 R54 R85 C74 Q1 C81 C79 D2 K7 R13 C76 U9 K9 K8K11 C4

18、 R7 R36 U2 R90 R89 K13K12 C61 R65R67 U8 R78 R57 R58 C77 C60 Q3 R51 R50 C72C70 K16 R55 C48C47 K19 R88 C83 R52 J1 C18 C23 R48 C9 129472 R31 C64 R49 C66 C63 C51 C57 V5V6 C44 R47 K20 GP2 C80 J7 J6 C13 K6 K10 J3 K17 K18 J10 C75 V4 J5 U6 C62 V7 C49 D1 C14 J8 U11 U7 C78 U10 J4 J2 * * * * Rev. A CDDVDPHCD2T

19、UNERTAPE OUT TAPEOUT 2AMP INOUT 1 141615 2BMAIN 049965 SH 2 OF 2 RadioFans.CN 收音机爱好者资料库 1718 MA2275 CONTROL 0499663 RadioFans.CN 收音机爱好者资料库 1920 CONTROL 0499663 R2 R5 Q2 R12 R13 C4 C5 Q1 R6 R15 R17 C2 C1 R1 R8 C3R22 S1 DS2 DS14 DS13 DS12 JMP1 129473 U4 R11 R9 R21 R23 R19 R16 DS9 R10 DS1 DS4 Y1 J2J1

20、 R20 R24 R18 DS10 DS11 U1 J3 R7 U5 DS7 U3 DS15 DS6 R3 R4 ASSY1 DS5 U2 Rev.A RadioFans.CN 收音机爱好者资料库 BALANCED 0499674 MA2275 2122 RadioFans.CN 收音机爱好者资料库 2324 VOLUME/TONE 049968 5AVOLUME/TONE 0499685B RadioFans.CN 收音机爱好者资料库 2526 MA2275 VOLUME/TONE 0499685 R13 C19 R21 R22 R20 D1 R19R24 C17C20 R25 R6

21、R5 R2 C4 K1 C16 C13 R14 R15 U2 C14 K4K2 R16R23 129475 C11 C1 C8 C6 C3 C42 C5 C9 C12 R7 C15 R18R4 C10 U1 R8 R3 R10 R9 R11 R12 K3 C18 J1 R53 R26 C2 C7 R17 R1 U7 Rev.A RadioFans.CN 收音机爱好者资料库 DATA 0499696 2728 C5 C1 C4 D3 C2 R13 R16 R14 R19 R22 R8R7 R5 R2R10R20 129476 R23R6 R3 U4 D2 U3 C3 R11 R21 D1 J8

22、 SP1 J5J4J2J7J10 J9 R9R4R1R12R17 R15 U1 U2 R18 J6 SP2 J3J1J11 Rev.A RadioFans.CN 收音机爱好者资料库 2930 PUSHBUTTON 0499707 MA2275 0V 5.6V NC 3 3 3 3 3 3 3 3 3 3 3 3 J1:18 J1:17 J1:16 J1:13 J1:12 J1:11 J1:8 J1:7 J1:6 J1:3 J1:2 J1:1 15V 5.6V 0V 3 3 3 3 3 3 J1:15 J1:14 J1:10 J1:5 J1:9 J1:4 TO DISPL TONE BYPAS

23、S STANDBY/ON 324 R1 REC MON MUTE REC MON MUTE .1uF C1 MONO 47uF C2 5.6V IR SENSOR 5.6V 15V 5.6V 5.6V 5.6V 5.6V HDPH GND FP DATA 15V REC MON TONE MUTE REC MON TONE BYPASS MUTE STANDBY/ ON S4 TONE BYPASS MONO S5 100 R2 5.6V L HDPH GND R HDPH TUBE WARMUP MONO MONO 1 2 3 45 6 7 8 DS8 R14 S1S2S3 213 Vcc

24、Vout GND MT1 STANDBY/ON TUBE WARMUP 5V J1:2 J1:7 J1:12 J1:17 DS5 DS4 DS2 J1:1 J1:3 J1:6 J1:5 J1:8 J1:11 J1:10 J1:13 J1:16 J1:15 J1:18 DS3 1 3 2 J2 DS1 J1:4 J1:9 J1:14 AY NC 5.6V 5.6V 0V 0V 0V 0V 499 RadioFans.CN 收音机爱好者资料库 3132 AMPLIFIER 049971 8 R L RadioFans.CN 收音机爱好者资料库 3334 AMPLIFIER 0499718 MA

25、2275 R30 R21 L1 R10 Q7 R32 C1 R17 R14 Q2 R5 R11 R36 R7 R6 R9 R13 J3 J4 J9 Q9 R16 R37 R35 Q8 J1 R33 C10 C8 C2 C7 R8 R34 Q4 Q6 J5 J6 J2 C3 U1 C4 C11 L2 R31 R27 F1 R23 R22 Q5 Q3 R15 R12 R19 R25 129478 C6 R20 R24 C5 V1 J7 V2 R28 V3 Rev.A YEL GRYBLU GRNYEL/WHT BLU/WHT RadioFans.CN 收音机爱好者资料库 3536 POWER S

26、UPPLY 0499729 11 11 11 11 11 1 1 1 1 1 1 1 1L1 1L1 1 1 RED 14V -15V 15V -15V 15V 2 2 2 2 2 2 8L 8L 8L 8L 11 1 1 RED -24V 24V 2 2 2 8L 8L J11:6 J11:5 J11:3 J11:2 J11:1 T1 T1 T1 T1 T1 T1 T2L T2R GND GND 5V D5 24V 300V 100k R5 TURN/ON -15V 15V -24V 300V FIL_B AMP_MUTE -400V FIL_B FIL_A -400V J5:9 J5:7

27、14V J5:6 J5:5 FIL B J5:4 FILGND FILA J5:1 GND 8R FIL B J7:6 8RJ7:5 FILGND FIL B 8RJ7:2 TURN ON 8R -400V J7:1 J7:6 J7:5 FILGND J7:4 FILA TURN ON J7:1 J11:4 T1 T1 5V .047uF C13 47uF C6 2.2k 2w R10 2 34 1 AC AC D1 -24V 4700uF C14 47uF C7 -400V 680uF C4 680uF C3 10uF C15 47uF C5 D3D2 100k 2w R2 18k R1 1

28、uF C8 100k R6 3 1 2 G D S Q6 AMP_MUTE 100k R9 14V 24V FIL_A TURN/ON J5:8 J5:3 TO MAIN -15V 15V J5:2 300V 8R 8R TO R AMP J7:4 J7:3 FIL B J7:2 J7:3 -400V TO BACKUP PS 4700uF C11 680uF C9 680uF C10 10uF C12 D10 3 1 2 Q2 221k R8 TO L AMP TO POWER TRANSFORMER J11:1 POWER ON POWERON J11:5 J11:6 BLK J14 BL

29、U D9 BLU/BLK BLUJ8 GRN GRN/BLKJ6 FIL_A BLUJ1 REDJ12 REDJ13 -24V POWER ON POWERON J18:6 J18:5 J17:6 J17:1 J16:5 J11:3 J11:2 POWER ON F2 2A J10 D8 3 1 2 INOUT U3 F1 2A J7 D6 2 31 INOUT U2 FIL_B GRN J5 D4 RED J4 J3 .047uF C2 J2 1M R7 -15V 23 1 Q1 J18:8 J18:9 J18:4 J18:3 J18:2 J18:1 AMP MUTE J17:5 J17:2

30、 J17:3 J17:4 J16:6 AMP MUTE J16:1 J16:2 J16:3 TURN/ON AMP_MUTE 1 GP1 J9 J11:4 D7 1 3 2 Q3 2.74M R4 J18:7 J16:4 15V REGULATOR -15V REGULATOR 300V REGULATOR 100k 2w R75 100k 2w R76 POWER AMPLIFIER TURN ON CONTROL 485V 485V 485V 490V .47uF C1 RadioFans.CN 收音机爱好者资料库 J13 C13 R9 R6 R7 C8 R4 J12 D10 J5 J6

31、 J7 D5 D3 D2 129526 D4 R8 Q6Q3 R5 Q2 J3J4 J2 J1 C5 Q1 C15 D6 D8 D9 F1 F2 C12 GP1 J18 J17 C7 R10 C6 C2 R1 J9 C14 C11 J11 J10 J14 D7 U3U2 J8 D1 C9 J16 C3 R2 C4 C10 BLUBLUBLU/BLK GRN RED RED Rev.A GRN REDBLK RED BLU RED GRN/BLK R76R75 3738 MA2275 POWER SUPPLY 0499729 RadioFans.CN 收音机爱好者资料库 METER 04997

32、310 3940 RadioFans.CN 收音机爱好者资料库 4142 MA2275 BACKUP PS 05000711TERMINAL 05005212 TERMINAL 05005213 RadioFans.CN 收音机爱好者资料库 4443 PARTS LIST Ref. No.DescriptionPart No. INTERCONNECT L1CHOKE FILTER .5H122379 LFILLINE FILTER117755 MT1METER124087 MT2METER124087 S1POWER SWITCH171026 S2SWITCH146243 T1POTTE

33、D TRANSFORMER, POWER050041 T2POTTED TRANSFORMER, OUTPUT050042 T3POTTED TRANSFORMER, OUTPUT050042 049965 MAIN PCB C1CAP MONO 47PF 200V 10% NPO061299 C2CAP MONO 47PF 200V 10% NPO061299 C3CAP ELECT 100UF 16V OR 25V066447 C4CAP ELECT 100UF 16V OR 25V066447 C5CAP MPF 0.1UF 630VDC064431 C6CAP MPF 0.1UF 63

34、0VDC064431 C7CAP PF 0.001UF 5% 63VDC064300 C8CAP PF 0.001UF 5% 63VDC064300 C9CAP ELECT 100UF 25V-50V066161 C10CAP ELECT 100UF 25V-50V066161 C11CAP MPF 0.0033UF 5% 63VDC064306 C12CAP MPF 0.0033UF 5% 63VDC064306 C13CAP MPF 0.1UF 630VDC064431 C14CAP MPF 0.1UF 630VDC064431 C15CAP ELECT 10UF 50V066445 C1

35、6CAP ELECT 10UF 50V066445 C17CAP ELECT 10UF 16V 4X5 CASE066382 C18CAP ELECT 10UF 16V 4X5 CASE066382 C19CAP ELECT 10UF 16V 4X5 CASE066382 C20CAP ELECT 10UF 16V 4X5 CASE066382 C23CAP ELECT 10UF 16V 4X5 CASE066382 C24CAP ELECT 10UF 16V 4X5 CASE066382 C25CAP ELECT 10UF 16V 4X5 CASE066382 C26CAP ELECT 10

36、UF 16V 4X5 CASE066382 C27CAP ELECT 10UF 16V 4X5 CASE066382 C28CAP ELECT 10UF 16V 4X5 CASE066382 C29CAP ELECT 10UF 50V066445 C30CAP ELECT 10UF 50V066445 C31CAP MONO 100PF 100V 10% NPO061300 C32CAP MONO 100PF 100V 10% NPO061300 C33CAP MONO 100PF 100V 10% NPO061300 C34CAP MONO 100PF 100V 10% NPO061300

37、C35CAP MONO 100PF 100V 10% NPO061300 C36CAP MONO 100PF 100V 10% NPO061300 C37CAP MONO .1uF 50V 20% Z5U061305 C38CAP ELECT 10UF 16V 4X5 CASE066382 C39CAP ELECT 10UF 16V 4X5 CASE066382 C40CAP MONO .1uF 50V 20% Z5U061305 C41CAP MONO .1uF 50V 20% Z5U061305 C42CAP MONO .1uF 50V 20% Z5U061305 C43CAP ELECT

38、 10UF 50V066445 C44CAP MONO 220PF 100V 10% NPO061301 C45CAP ELECT 10UF 16V 4X5 CASE066382 C46CAP ELECT 10UF 16V 4X5 CASE066382 C47CAP ELECT 10UF 50V066445 C48CAP ELECT 10UF 50V066445 C49CAP ELECT 100UF 25V-50V066161 C50CAP ELECT 100UF 25V-50V066161 C51CAP MPF 0.22UF 400VDC064438 C52CAP MPF 0.22UF 40

39、0VDC064438 C53CAP MONO 220PF 100V 10% NPO061301 C54CAP MONO 220PF 100V 10% NPO061301 C55CAP MONO 47PF 200V 10% NPO061299 C56CAP MONO 47PF 200V 10% NPO061299 C57CAP ELECT 22UF 100V066506 C58CAP MONO 220PF 100V 10% NPO061301 C59CAP MONO .1uF 50V 20% Z5U061305 C60CAP ELECT 10UF 50V066445 C61CAP POLY .0

40、47UF 10% 1000VDC064434 C62CAP POLY .047UF 10% 1000VDC064434 C63CAP MONO .1uF 50V 20% Z5U061305 C64CAP MONO .1uF 50V 20% Z5U061305 C65CAP ELECT 10UF 50V066445 C66CAP ELECT 10UF 50V066445 C67CAP MONO .1uF 50V 20% Z5U061305 C68CAP MONO .1uF 50V 20% Z5U061305 C69CAP ELECT 10uF 50V066445 C70CAP ELECT 10u

41、F 50V066445 C71CAP ELECT 10uF 50V066445 C72CAP ELECT 10uF 50V066445 C73CAP ELECT 10UF 50V066445 C74CAP MONO .1uF 50V 20% Z5U061305 C75CAP ELECT 10UF 250V066493 C76CAP ELECT 1000UF 25V066513 C77CAP ELECT 10UF 50V066445 C78CAP MONO 47PF 200V 10% NPO061299 C79CAP MONO 47PF 200V 10% NPO061299 C80CAP MON

42、O 100PF 100V 10% NPO061300 C81CAP MONO 100PF 100V 10% NPO061300 C82CAP MONO .1uF 50V 20% Z5U061305 C83CAP MONO .1uF 50V 20% Z5U061305 C84CAP MONO .1uF 50V 20% Z5U061305 C85CAP MONO .1uF 50V 20% Z5U061305 C86CAP ELECT 10UF 250V066493 D1DIODE SILICON070047 D2DIODE SILICON070047 D4DIODE SILICON070047 G

43、P1BRACKET PCB CARD MOUNTING003611 GP2BRACKET PCB CARD MOUNTING003611 J1CONN 12 PIN FFC117720 J2JACK RCA 4X2 WHT/RED 14MM117791 J3JACK RCA 4X2 WHT/RED 14MM117791 J4JACK RCA 2X2 WHT/RED 14MM117789 J5HEADER 9 CIRCUIT POST NATURAL117724 J6CONN FFC 18PIN117765 J7CONN 12 PIN FFC117720 J8CONN 23 PIN FFC117

44、715 J10CONN 12 PIN FFC117720 J11CONN 12 PIN FFC117720 K1RELAY REED FORM 1A 5V 500 OHMS087050 K2RELAY REED FORM 1A 5V 500 OHMS087050 K3RELAY REED FORM 1A 5V 500 OHMS087050 K6RELAY REED FORM 1A 5V 500 OHMS087050 K7RELAY REED FORM 1A 5V 500 OHMS087050 K8RELAY REED FORM 1A 5V 500 OHMS087050 K9RELAY REED

45、 FORM 1A 5V 500 OHMS087050 K10RELAY REED FORM 1A 5V 500 OHMS087050 K11RELAY REED FORM 1A 5V 500 OHMS087050 K12RELAY REED FORM 1A 5V 500 OHMS087050 K13RELAY REED FORM 1A 5V 500 OHMS087050 K16RELAY REED FORM 1C 5V 125 OHM087056 K17RELAY REED FORM 1C 5V 125 OHM087056 K18RELAY REED FORM 1A 5V 500 OHMS08

46、7050 K19RELAY REED FORM 1A 5V 500 OHMS087050 K20RELAY REED FORM 1A 5V 500 OHMS087050 K21RELAY REED FORM 1A 5V 500 OHMS087050 Q1TRANSISTOR NPN132223 Q2TRANSISTOR NPN132257 Q3TRANSISTOR NPN132257 Q4TRANSISTOR PNP132224 R1RES MF 1K 1% 1/4W144090 R2RES MF 1K 1% 1/4W144090 R3RES MF 47.5K 1% 1/4W144108 R4

47、RES MF 47.5K 1% 1/4W144108 R5RES MF 953 OHM 1/4W 1%144473 R6RES MF 1.74K 1% 1/4W144351 R7RES MF 953 OHM 1/4W 1%144473 R8RES MF 1.74K 1% 1/4W144351 R9RES MF 221K 1% 1/4W144421 R10RES MF 221K 1% 1/4W144421 R11RES MF 75K 1% 1/4W144156 R12RES MF 75K 1% 1/4W144156 R13RES MF 1M 1/4W144269 R14RES MF 1M 1/4W144269 R15RES MF 681 OHM 1% 1/4W144195 R16RES MF 681 OHM 1% 1/4W144195 R17RES MF 150K 1% 1/4W144419 R18RES MF 150K 1