McIntosh-MC2000-pwr-sm维修电路原理图.pdf

SERVICE MANUAL POWER AMPLIFIER Performance Specifications . 2 Notes . 2 Rear Panel. 3 Section Location . 4 Block Diagram . 5 - 6 Interconnection Diagram . 7 - 8 Input PCB and Schematic. 9 - 10 Main PCB and Schematic. 11 - 13 Power Supply PCB and Schematic . 14 AC Power PCB and Schematic . 15 - 16 Switch Remote PCB and Schematic . 17 - 18 Meter PCB and Schematic. 19 - 20 Bias Control PCB and Schematic . 21 - 22 Meter Lamp PCB and Schematic . 21 - 22 Lamp PCB and Schematic . 21 - 22 Logo Lamp PCB and Schematic . 21 - 22 Output PCB and Schematic. 21 - 22 Parts List. 23 - 24 Exploded View and Parts List. 25 - 28 Repacking Instructions . 29 CONTENTS RadioFans.CN 收音机爱 好者资料库 PERFORMANCE SPECIFICATIONS 1. The heavy lines on the schematics denote the primary signal path. 2. Unless otherwise noted, all voltages indicated on the schematics are measured under the following conditions: a. AC input at 120 volts, 50/60Hz b. All voltages are +/-10% with respect to ground. A high impedance (10megaohm) voltmeter must be used. 3. Unless otherwise specified: a. Resistors values are in ohms. b. Capacitor values are in microfarads (uF). c. Inductor values are in microhenries (uH). 4. On PC Board Drawings, Square Pad Indicates: a. Polarized Capacitors - Positive b. Diode - 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 2 Power Output 130 watts into 8, 4 or 2 ohm loads is the minimum sine wave continuous average power output per channel from 20Hz to 20,000Hz with both channels operating. Total Harmonic Distortion 0.5% maximum harmonic distortion at any power level from 250 milliwatts to rated power per channel from 20Hz to 20,000Hz with both channels operating. Intermodulation Distortion 0.5% maximum intermodulation distortion if instanta- neous peak power output does not exceed twice the output rating per channel with both channels operating, for any combination of frequencies from 20Hz to 20,000Hz. Rated Power Band 20Hz to 20,000Hz Frequency Response (at 1 watt) +0, -0.25dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 100,000Hz Hum and Noise (A-Weighted) 100dB below rated output Damping Factor Greater than 18 Output Load Impedance 2, 4 or 8 ohms Input Impedance 20k ohms Unbalanced (RCA Phono Jacks) 40k ohms Balanced (XLR Connectors) Input Sensitivity (Switch Selectable) 2.5 volts for rated output 1.2 volts for rated output (1 volt for 100 watts output) Tube Compliment 8 KT88 or 6550 Output Tubes 4 12AX7A Input Tubes 2 12AT7 Driver Tubes Power Requirement 100 Volts, 50/60Hz at 5.8 Amps 120 Volts, 50/60Hz at 4.8 Amps 230 Volts, 50/60Hz at 2.5 Amps Note: Refer to the rear panel of the MC2000 for the correct voltage. Dimensions 17-3/4 inches (45.1cm) wide by 11 inches (27.9cm) high. Depth behind front panel is 18-3/4 inches (47.6 cm). Handle clearance required in front of the mounting panel is 1-5/8 inches (4.1 cm). Finish Stainless Steel Chassis with Titanium Gold Super Mirror Finish, Black Transformer Enclosures, Black Base, Glass Front Panel with gold plated Handles and Knobs Weight Amplifier - 135 pounds (61.2 kg) net, 144 pounds (65.3 kg) in shipping carton Accessories - 18 pounds (8.2 kg) in shipping carton RadioFans.CN 收音机爱 好者资料库 MC2000 3 REAR PANEL RadioFans.CN 收音机爱 好者资料库 SECTION LOCATION TOP VIEW WITH COVER REMOVED BOTTOM VIEW WITH COVER REMOVED 4 RadioFans.CN 收音机爱 好者资料库 BLOCK DIAGRAM 56 MC2000 MUTE BALANCED/ UNBALANCED RELAY UNBALANCED + - BALANCED 1.2V/2.5V LEVEL RELAY BUFFER VOLTAGE N.F.B. BUFFER HOLD CIRCUIT RECTIFIER BUFFER BIAS CONTROL BUFFER OUTPUT TRANS- FORMER 8 4 2 ? ? ? COM LEFT OUTPUT L. METER HOLD CIRCUIT RECTIFIER BIAS CONTROL BUFFER BUFFER OUTPUT TRANS- FORMER BUFFER MUTEBUFFER 1.2V/2.5V LEVEL RELAY BALANCED/ UNBALANCED RELAY VOLTAGE N.F.B. BALANCED UNBALANCED 8 4 2 ? ? ? COM - + R. METER RIGHT OUTPUT METER HOLD SWITCH INPUT LEVEL SWITCH BALANCED/ UNBALANCED MODE SWITCH LEFT INPUTS RIGHT INPUTS UNITY INVERTING AMP UNITY GAIN AMP INPUT AMP DRIVER AMP DRIVER AMP LOG AMP OUTPUT AMP OUTPUT AMP DC AMP DC AMP DC AMP DC AMP OUTPUT AMP LOG AMP DRIVER AMP DRIVER AMP OUTPUT AMP INPUT AMP UNITY INVERTING AMP UNITY GAIN AMP PHASE INVERTER PHASE INVERTER POWER RELAY FUSE INPUT VOLTAGE SELECTOR MAIN 500V DC SUPPLY 150 AND 300V DC - - 12V DC -+ 12V DC INPUT VOLTAGE SELECTOR MAIN 500V DC SUPPLY 150 AND 300V DC - - 12V DC -+ 12V DC FUSE FUSE POWER SWITCH POWER CONTROL REMOTE LAMP IN OUT LEFT POWER SUPPLY RIGHT POWER SUPPLY POWER TRANSFORMER POWER TRANSFORMER 12VAC 12VAC STANDBY TRANSFORMER CONTROL 5V SUPPLY 100/120/230VAC 50/60Hz INRUSH CURRENT LIMITER INRUSH CURRENT LIMITER REMOTE JACKS POWER SUPPLY SECTION RadioFans.CN 收音机爱 好者资料库 INTERCONNECT 78 RadioFans.CN 收音机爱 好者资料库 INPUT 049305 9100 MC2000 2R2L RadioFans.CN 收音机爱 好者资料库 MAIN 049306 1112 3R3L RadioFans.CN 收音机爱 好者资料库 MAIN 049306 1314 MC2000 3R3LPOWER SUPPLY 0493084R4L RadioFans.CN 收音机爱 好者资料库 AC POWER 049309 1516 5 RadioFans.CN 收音机爱 好者资料库 SWITCH REMOTE 049310 1718 MC2000 6 RadioFans.CN 收音机爱 好者资料库 METER 049307 1920 7R 7L RadioFans.CN 收音机爱 好者资料库 BIAS CONTROL 049311 2122 MC2000 8R 8LMETER LAMP 0493379R 9L LAMP 04931110LOGO LAMP 049311 11R 11LOUTPUT 04931212R 12L RadioFans.CN 收音机爱 好者资料库 PARTS LIST 23240 PART NO.DESCRIPTIONREF. NO. 049305 Input 066316CAP ELECT 10UF 20% 25V NPC1 C3 070047SILICON DIODE 1N4148 T&RD1 D2 087056REED RELAY FORM 1C 5V 125OHMK1 K2 117216MALE CONN 5 PIN 0.1 POST ASSYJ2- 117221MALE CONN 3 POS RT ANGLEJ3- 1177229 POSITION RECEPTACLEJ1- 132222N. CHANNEL FETQ6 144015MF RES 33.2K 1% 1/4WR1 144104METAL FILM RES 20K 1% 1/4WR6 144141MF RES 27.4K 1% 1/4WR4 144154RES MF 12.1K 1% 1/4WR23 144269METAL FILM RES 1M 1/4WR11 R12 144379RES METAL FILM 4.75M 1/4W 1%R19 144412MF RES 15K 1% 1/4WR24 144421MF RES 221K 1% 1/4WR2 144423MF RES 174 OHM 1% 1/2WR8 R20 144439MF RES 24.9K 1% 1/4WR5 R7 049306 Main 061293DISC 22PF 500VC1 C17 061295DISC 3.3 PF 1000VC2 061306DISC 220 PF 100VC18 064364CAP POLYPROP .047MF 10% 250VC25 064431POLYPRO 0.1MF 630VC9 C10 064432POLYPRO 0.22MF 1000V 20%C12 C13 064433POLYPRO 1.0MF 250V 20%C4 064435POLYPRO 2.2 MF 250V 10%C5 066492ELECT 10MF 100VC8 C11 066493ELECT 10MF 250VC15 C16 066494ELECT 10MF 450VC19 066495ELECT 47MF 16VC22 C24 066497ELECT 47MF 450VC20 066498ELECT 100MF 6.3VC6 C7 066500ELECT 1000MF 16V NONPOLARC14 066502ELECT 4700MF 25VC21 C23 070126DIODE 200V 3AD1 D2 089088FUSE 2A SLO-BLO 5 X 20 250VIECF1 117217MALE CONN 7 PINJ3- 117218MALE CONN 6-POS FRICTION LKJ2- 1177239 POSITION HEADERJ1- 1177249 CIRCUIT POST HEADER NATURALJ4- 1177259 CIRCUIT POST HEADER REDJ5- 122001CHOKE 2.2 MHL1 L2 L3 L4 132136TRANSISTOR NPN T092Q1 Q2 Q3 Q4 Q5 Q6 133155IC REGULATOR -12VIC2 133156IC REGULATOR 12VIC1 134492TRIM POT 2K 10%R7 139009WIRE RES 220 OHMS 10% 5WR42 R43 R44 R45 1392182.7 OHM 2W 5% WW RESISTOR FPR52 R53 144104METAL FILM RES 20K 1% 1/4WR22 14410633.2K 1% 1/4WR18 R51 144113RES MF 100K 1% 1/4WR2 144119METAL FILM RES: 332K 1% 1/4WR27 144141METAL FILM RES 27.4K 1% 1/4WR50 144196METAL FILM RES 100 OHM 1% 1/4WR14 144269METAL FILM RES 1M 1/4WR9 1443091K OHM 1% 1/2W METAL FILMR38 R39 R40 R41 144408MF RES 562 OHM 1% 1/4WR13 144410MF RES 1.2K 1% 1/4WR5 R10 144414MF RES 18.2KR6 R8 144417MF RES 93.1K 1% 1/4WR1 144418MF RES 121K 1% 1/4WR4 144421MF RES 221K 1% 1/4WR17 R21 R25 R26 144422MF RES 1.5M 1% 1/4WR23 R24 144424MF RES 3.92K 1% 1/2WR47 144427MF RES 22.1K 1% 1/2WR46 144428MF RES 47.5K 1% 1/2WR16 R20 R34 R35 144429MF RES 100K 1% 1/2WR3 R11 144430MF RES 121K 1% 1/2WR15 144431MF RES 150K 1% 1/2WR19 144432MF RES 1M 1/2WR32 R33 144435MO RES 30.1K 1% 1WR36 R37 144436MO RES 46.4K 1% 1WR28 R29 R30 R31 R48 144437MO RES 10K 5% 2WR49 144438MO RES 100K 5% 2WR54 178169OCTAL TUBE SOCKET CERAMICV4 V5 V6 V7 1781709 PIN TUBE SOCKET CERAMICV1 V2 V3 049308 Power Supply 064431POLYPRO 0.1MF 630VC10 064434POLY CAP .047UF 10% 1KV (MKP4)C9 066495ELECT 47MF 16VC5 066496ELECT 47MF 250VC6 C7 C8 066503ELECT 810MF 300VC1 C2 C3 C4 070099ZENER DIODE 12V 400MWD3 070131DIODE RECTIFIERD5 D6 070165BRIDGE RECT 1000V 6AD4 070166MR253L TRANS. SUPPRESSORD2 080017TO-220 HEATSINKQ1 089088FUSE 2A SLO-BLO 5 X 20 250VIECF1 1177249 CIRCUIT POST HEADER NATURALJ2- 1177259 CIRCUIT POST HEADER REDJ1- 132284MTP2955V FET POWER TRANSISTORQ1 144415MO RES 475 1% 1WR5 144425MF RES 10K 1% 1/2WR1 R3 R4 144426MF RES 15K 1% 1/2WR2 049309 AC Power 066501ELECT 3300MF 35VC1 070031SIL DIODE 400 PIV 1.5A (RED)D2 087071RELAY TV8 5V COILK1 089111FUSE 50MA 5X20MMF1 1172154-PIN CONNECTORJ8- 117216MALE CONN 5-PIN 0.1 POST ASSYJ9 117719PCB MOUNT POWER CONNECTOR REDJ10- J11- J12- J13- J14- J15- 117726.187 FASTON TABJ1 J2 J3 J4 J5 J6 J7 133108IC +5V REGULATORIC1 144090METAL FILM RES 1K 1% 1/4WR1 144282THERMISTORRT1 RT2RT3 RT4 159314TRANSFORMER 115/230-8/16V 6VAT1 178172FUSE HOLDER 5X20MMF1 049310 SW Remote 061248DISC CAP .1MF 25V Y5TC2 064329CAP M POLY .22UF 5% 63VDCC1 117214MALE CONN 3-POS MTS100 NORMALJ3 117218MALE CONN 6-POS FRICTION LKJ4- 117406MIN. PHONO JACK R657J1- J2- 132171TRANSISTOR NPNQ1 133192IC NAND SCHMIT 2-IN X 4IC1 144082METL FILM RES 68.1 OHM 1% 1/4WR5 R6 144090METAL FILM RES 1K 1% 1/4WR1 144187METAL FILM RES 22.1K 1% 1/4WR2 R3 144269METAL FILM RES 1M 1/4WR4 148074SLIDE SWITCH DPDT 3MMS1 S2 049307 Meter 061248DISC CAP .1MF 25V Y5TC4 C9 C10 C11 061249DISC CAP .47UF 50V MONOLITHICC12 C13 064329CAP M POLY .22UF 5% 63VDCC8 064337POLY CAP 1MF 5% 50VC7 066491ELECT 4.7MF 100VC1 066499ELECT 220MF 25VC2 C3 066510CAP ELEC 1 UF 50VC14 070047SILICON DIODE 1N4148 T&RD1 D3 D4 D6 D7 D8 D9 D10 D13 070085ZENER DIODE 6.2V 5% 500MWD12 070131DIODE RECTIFIERD2 D11 089088FUSE 2A SLO-BLO 5 X 20 250VIECF1 117221MALE CONN 3 POS RT ANGLEJ2- 117223MALE CONN 6 PIN RT ANGLEJ1- 1172404 PIN RT. ANGLEJ3- 131021TRIAC 8A 200VQ8 132223TRANSISTOR NPN MPS4124 2K/REELQ1 Q5 132224TRANSISTOR PNPQ2 Q6 132226TRANSISTOR P.CHANNEL JUNC.FETQ7 132254TRANSISTOR NPNQ3 Q4 133155IC REGULATOR -12VIC2 133156IC REGULATOR 12VIC1 133260DUAL OPERATIONAL AMPLIFIERIC3 IC4 134383TRIM POT 100K OHM 20%R10 141060RES CF 3.3K 5% 1/4WR23 141125RES CF 2.7M 5% 1/4WR1 141136RES CF10 5% 1/4WR26 141179CARB FILM RES 680 OHMS 5% 1/2WR24 144053RES MF 10K 1% 1/4WR7 R20 R22 144053RES MF10K 1% 1/4WR7 R22 144087MF 499 OHMSR17 144090METAL FILM RES 1K 1% 1/4WR19 R25 14410316.5K 1% 1/4WR18 144117METAL FILM RES 200K 1% 1/4WR6 R12 144125METAL FILM RES 150K 2% 1/4WR9 144187METAL FILM RES 22.1K 1% 1/4WR21 144196METAL FILM RES 100 OHM 1% 1/4WR11 R16 144264METAL FILM RES 10M 1% 1/4WR8 144269METAL FILM RES 1M 1/4WR2 144271METAL FILM RES 2.74M OHM 1/4WR13 144411MF RES 3.92K 1% 1/4WR15 144412MF RES 15K 1% 1/4WR5 R14 144342MF RES 13.7K 1% 1/4WR20 049311 Bias Control 117217MALE CONN 7 PINJ1- 134497TRIM POT 100K 10%R1 R2 14410633.2K 1% 1/4WR3 150059TACT SWITCHS1 S2 049337 Lamp 1462523 POSITION 2POLE ROTARY SWITCHS1 049312 Output 064431POLYPRO 0.1MF 630VC1 117726.187 FASTON TABJ1 J2 J3 J4 J5 139119WIRE RES 4 OHMS 5% 5WR1 RadioFans.CN 收音机爱 好者资料库 EXPLODED VIEW 1 OF 2 2526 MC2000 RadioFans.CN 收音机爱 好者资料库 EXPLODED VIEW 2 OF 2 27 PARTS LIST 1016403FRONT GLASS 2049334GOLD KNOB 3104164FELT WASHER 4018628HANDLE FRONT 5018625PANEL SIDE LEFT 6018624PANEL SIDE RIGHT 7100200MS 10-32 X 1/2 PHIL TRUSS BLK 8017790PLEXIGLAS PANEL 9092424METER COLOR FILTER 10005007PANEL PLATE 11101142CAP SCREW 1/4 -20 X 1-1/4 12101215SEMS MS 8-32 X 1/4 PHIL PAN 13004961DUST COVER 14005006GUSSET RIGHT 15005005GUSSET LEFT 16005039TOP SUBPANEL BRACKET 17102003MACH NUT: 6-32 W/LOCK 18101078TS 8-32 X 5/16 PHIL PAN BLK 19126588SIGNATURE NAMEPLATE 20049379WINDOW TRIM 21101054TS 6-32 X 1/4 PH PAN TAPTITE BLK 22124071METER 23005008SWITCH BRACKET 24049357METER ROTARY SWITCH PCB 25049338PANEL/LED LIGHT PCB 26104163M7 INTERNAL TOOTH LOCKWASHER 27110004M7 X .75 HEX CONTROL NUT 28004970SUBPANEL 29092401BLUE FILTER PALE 30092400BLUE FILTER AZURE 31017749METER LIGHT BOX 32049336METER LIGHT BOX PCB 33114072PLASTIC RIVET 34049307METER PCB 35100296SEMS 4-40 X 5/16 PHIL PAN 36094360FOAM TAPE 1/2” X 1/2” 37094017FOAM TAPE 1/4” X 1/4” 38049339PANEL LIGHT PCB 39005018CHASSIS GOLD 4016506512AX7A TUBE 4116506712AT7 TUBE 42165069KT88 TUBE 43017761AIR PIPE 44049305INPUT SWITCH PCB 45114139PCB SUPPORT 46017801PLASTIC RIVET 47100292MS 6-32 X 3/8 PH FH BLK ZINC 48102006MACH NUT: 10-32 W/LOCK 49049304POWER TRANSFORMER 50126582POWER TRANSFORMER DECAL 51049301OUTPUT TRANSFORMER 52126581OUTPUT TRANSFORMER DECAL 53052093TUBE COVER 54101214SCREW, TUBE COVER 55049306MAIN AMP PCB 56004967FOOT CHANNEL RIGHT 57004968FOOT CHANNEL LEFT 58018626FOOT 59004971 CHASSIS SUPPORT 60024010FOOT PAD 61005071INPUT SHIELD BRACKET 62005032CHASSIS BASE 63049310SWITCH REMOTE PCB 64049308POWER SUPPLY PCB 65049309AC POWER PCB 66018622HANDLE REAR 67117742RCA JACK RED 68117743RCA JACK WHITE 69117487AC LINE RECEPTACLE 70178122FUSE HOLDER W/HARDWARE 71117741BINDING POST BLACK 72117740BINDING POST RED 73117744XLR RECEPTACLE 74100195MS 4-40 X 3/8 PHIL OVAL GOLD 75104165LW INTERNAL TOOTH 76102052NUT GOLD 771001101/4-20 X 5/8 PAN PH BLK ZINC 78104162LOCKWASHER INTERNAL TOOTH 79102051HEX NUT M9 X .75 GOLD PLATED 80049312OUTPUT TERMINAL PCB 81005035BIAS PLATE LEFT 82005036BIAS PLATE RIGHT 83049311BIAS PCB 84101193SEMS 4-40 X 1/4 PHIL PAN BLK ZINC 85004974BIAS COVER 86100193MS 4-40 X 1/4 FLAT PH BLK ZINC 87004969BOTTOM COVER 88100159MS 10-32 X 3/4 PH PAN BLK ZINC 280 Ref. No. Part No. Description RadioFans.CN 收音机爱 好者资料库 29 REPACKING INSTRUCTIONS RadioFans.CN 收音机爱 好者资料库 POWER AMPLIFIER SERVICE MANUAL The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design without notice. Because of the constant upgrading of McIntosh products circuitry and components, the Company cannot insure, and does not warrant, the accuracy of the within schematic material, which is intended for information only. McINTOSH LABORATORY, INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK 13903 Printed in U.S.A. Part Number 040702 RadioFans.CN 收音机爱 好者资料库