McIntosh C50 Service Manual
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Performance Specifications ..........................................2
Notes ...........................................................................2
Rear Panel ...................................................................3
Section Location .....................................................5 - 6
Block Diagram .......................................................7 - 8
Interconnection Diagram ......................................9 - 10
Display Schematic and PCB................................11 - 22
Control Schematic and PCB ................................23 - 34
Audio Schematic and PCB ..................................35 - 46
Balanced I/O Schematic and PCB .......................47 - 50
SERVICE MANUAL
C50
AUDIO PREAMPLIFIER
SERIAL NO. AAW1001 And Above
CONTENTS
Digital Audio Schematic and PCB .......................51 - 58
Backup PS Schematic and PCB ...........................59 - 62
Power Supply Schematic and PCB ......................63 - 66
Headphone Schematic and PCB .........................67 - 68
8-Band EQ ..........................................................69 - 70
Audio Expansion ................................................71 - 74
Meter Light Schematic and PCB ..........................75 - 76
Parts List .............................................................77 - 92
Repacking Instruction ................................................93
C50

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Summary of Contents for McIntosh C50

  • Page 1: Table Of Contents

    AUDIO PREAMPLIFIER SERIAL NO. AAW1001 And Above CONTENTS Performance Specifications ..........2 Digital Audio Schematic and PCB .......51 - 58 Notes ................2 Backup PS Schematic and PCB ......59 - 62 Rear Panel ..............3 Power Supply Schematic and PCB ......63 - 66 Section Location .............5 - 6 Headphone Schematic and PCB ......67 - 68 Block Diagram ............7 - 8...
  • Page 2: Performance Specifications

    220 Volts, 50/60Hz at 30 watts 230 Volts, 50/60Hz at 30 watts 240 Volts, 50/60Hz at 30 watts Standby Power, less than 0.5 watts Note: Refer to the rear panel of the C50 for the correct voltage. Overall Dimensions Width is 17-1/2 inches (44.45cm) Height is 7-5/8 inches (19.37cm) including feet...
  • Page 3: Rear Panel

    REAR PANEL...
  • Page 4 NOTES...
  • Page 5: Section Location

    SECTION LOCATIONS Top View Bottom View BALANCED I/O AUDIO AUDIO EXPANSION 8-BAND EQ POWER BACKUP CONTROL DIGITAL AUDIO Front View METER LIGHTING Rear View of Front Panel DISPLAY HEADPHONE PUSHBUTTON (DISPLAY)
  • Page 6: Block Diagram

    BLOCK DIAGRAM...
  • Page 7 INTERCONNECT...
  • Page 8 DISPLAY 751113 SCH 1 of 4 FRONT PANEL ILLUMINATION -15V J2:1 J9:18 J2:2 J9:17 .1UF J2:3 3.3V BU J9:16 J2:4 J9:15 2.21K PANEL_LAMP 3.3V VFD SDA J2:5 J9:14 .77V 3.3V INPUT_B J2:6 J9:13 VFD CE J2:7 J9:12 IR SENSOR J2:8 INPUT_A J9:11 VFD SCL...
  • Page 9 DISPLAY 751113 SCH 2 of 4 J14:12 J1:12 J14:11 J1:11 J14:2 LEFT BRIGHTNESS J1:2 ADJUST J14:1 J1:1 J14:4 J1:4 J14:5 J1:5 LEFT COLOR ADJUST J14:6 J1:6 J14:7 J1:7 J14:8 J1:8 J14:9 J1:9 J15:12 J1:12 METER ILLUMINATION DRIVER J15:11 J1:11 2.21K J15:2 RIGHT BRIGHTNESS J1:2...
  • Page 10 DISPLAY 751113 SCH 3 of 4 47.5 15.6V 10.6V -15V .1UF .1UF 220uF .1UF C170 R249 LEFT R113 LEFT 2.21 METER RECTIFIER 10.6V L-METER METER BUFFER .01uF R100 10.6V 22.1K 10.6V 100K 4.6V 47uF LEFT 100K -.5V U10:2 U11:1 METER DRIVER -3.7V -.5V none...
  • Page 11 DISPLAY 751113 SCH 4 of 4 Left Pushbutton PCB Right Pushbutton PCB PROC EQ BYPASS TRIM MUTE OUT 1 OUT 2 STANDBY PB SPARK GND-L PB SPARK GND-R To Left Pushbutton PCB To Right Pushbutton PCB Left Pushbutton A/D Buffer 3.26V 3.3V 22.1...
  • Page 12 DISPLAY 751113 PCB 1 of 2...
  • Page 13 DISPLAY 751113 PCB 2 of 2...
  • Page 14 CONTROL 751266 SCH 1 of 5 J4:1 USB+ J4:2 USB- J4:3 .1UF J4:4 3.3V BU J4:5 Converted 3.3V BU IR_DATA_OUT Data Out No Data VDD-CORE-R J4:6 ALL_DATA 256kbit MEMORY 3.3V BU 3.3V BU Active high output, to Data Drivers No Data IR_REAR Data Out Data Signal...
  • Page 15 CONTROL 751266 SCH 2 of 5 J7 :7 15.6V J7:7 20V_UNREG 20.1V_UNREG 22.1 J7 :6 Power_On ON/OFF J7:6 20V_UNREG J7 :5 J7:5 R1 3 J7 :4 J7:4 1.25V 18.2 K J7 :3 J7:3 J7 :2 J7:2 -20V_UNREG J7 :1 J7:1 -20V_UNREG -15.4V -15.4V...
  • Page 16 CONTROL 751266 SCH 3 of 5 DATA-IN RING R146 SLEEVE IR-IN RING 3.3V BU 3.3V IR SENSOR SLEEVE IR_REAR 3.3V 3.3V Vout Active Low 3.3V Output 3.2V Address=0 LVC-AND 10uF 3.3V BU R156 22.1 .1UF I2C_SDA 3.3V 3.3V BU R157 22.1 I2C_SCL 3.3V...
  • Page 17 CONTROL 751266 SCH 4 of 5 MAIN 12V_PC RING MAIN MAIN_LIGHT_PC 12.2V POWER 12.1V CONTROL MAIN_PC 12.1V SLEEVE 12.1V MAIN_LIGHT_PC LIGHTS OFF LIGHTS OFF R179 MAIN_PC-EN LIGHT_CTL 11.5V 2.21K 4.75K 22.1K 11.5V LIGHTS OFF LIGHT_CTL_IN MAIN_PC (Micro provides pullup) R198 5.5V LIGHTS OFF LIGHT CTL IN...
  • Page 18 CONTROL 751266 SCH 5 of 5 TO AUDIO PCB TO AUDIO PCB TO AUDIO PCB J11:1 J11:12 J11:2 J11:11 -15V J11:3 J11:10 3.3V BU VCC(A) VCC(B) 3.3V BU 3.3V BU VCC(A) VCC(B) 3.3V BU J11:4 J11:9 I2C_SCL I2C_SCL SCLA SCLB SCLA SCLB 3.3V...
  • Page 19 CONTROL 751266 PCB...
  • Page 20 AUDIO 751115 SCH 1 of 5 FROM CONTROL FROM CONTROL J3:6 3.3VBU1 J10:7 OUTPUT J3:8 3.3VBU1 5.0v 5.0v 3.3VBU2 J10:5 DECODER 3.3VBU1 C132 10uF .1UF DIGITAL DAC_L Address=4 J3:12 C141 AUDIO J10:1 DAC-L 3.3VBU1 3.3VBU1 R219 J14:1 10uF 3.3VBU1 R176 22.1 3.3VBU2 5.0v...
  • Page 21 AUDIO 751115 SCH 2 of 5 FROM CONTROL TO EQUALIZER R252 1.5k C148 15v -15v -15V R-MAIN L-MAIN C194 C206 22pF R300 15.5V R400 22uF J19:1 47uF C142 R224 OPEN -.1V + BALANCED AMP L-MAIN C186 10uF 22pF LISAUD-L C152 15.5V R401 R235...
  • Page 22 AUDIO 751115 SCH 3 of 5 5VMC 22pF 5VMC 3.5V -.7V -.6V 13.8V MC OUT 15.5V 10uF MC LEFT MC-L -5VMC 3.5V -15.4V 100pF -15V 13.5V .0015uF -.6V -.6V -.6V -.6V -.6V .01uF 0.033uF IN OUT 5VMC -5VMC J1:1 MC LEFT 470uF 7.5k.5% 89.8k.5%...
  • Page 23 AUDIO 751115 SCH 4 of 5 15.3V -.6V 13.8V R110 J10:2 10uF MM-R R108 47.5k -15V -15V 13.8V 0.033uF .01uF .0015uF MM PH INPUTS 470uF 89.8k.5% 7.5k.5% 95.3 15.4V -.6V 13.8V 10uF R109 J10:1 MM-L -15.3V -15V R107 13.8V 47.5k 0.033uF .01uF .0015uF...
  • Page 24 AUDIO 751115 SCH 5 of 5 -15.4VL1 10uF L_MAIN+ 1 LEFT + J2:1 J1:18 C105 10uF + BALANCED AMP C109 C117 5.0v R133 47uF L-MAIN 47uF U10:1 R129 R117 4.99k 221K 10uF 1 LEFT - J2:2 J1:17 15.5VL1 C118 R134 R124 47uF J11:17...
  • Page 25 AUDIO 751115 PCB...
  • Page 26 BALANCED I/O 751117 SCH 1 LEFT + J1:18 J2:1 1 LEFT + J2:2 J11:17 J1:17 1 LEFT- J2:2 1 LEFT - J2:1 J11:18 LEFT LEFT 2 LEFT+ J1:14 J2:5 J2:14 2 LEFT + J11:5 2 LEFT- J1:13 J2:6 J2:13 2 LEFT - J11:6 BALANCED BALANCED...
  • Page 27 BALANCED I/O 751117 PCB...
  • Page 28 DIGITAL AUDIO 751120 SCH 1 of 3 J11:12 J11:1 Not Used USBUSERID Not Used SPIO_MISO J11:11 -15V J11:2 Not Used SPIO_SCK Not Used SPIO_MOSI J11:10 J11:3 Not Used SPIO_CS3 J11:9 Reset 3.3V J11:4 R177 OPEN J11:8 .1uF J11:5 RESET_N .01uF VDDCORE J11:7 Pin 141...
  • Page 29 DIGITAL AUDIO 751120 SCH 2 of 3 3.3uH 3.3V .1uF J5:2 2.5V DIGITAL 4 3.3V .01uF J5-2 C153 .1uF IC CONVERTER SAMPLE RATE SMD .01uF U100 47.5 .1uF DIG 4:COAXIAL LRCLK J6:2 USB I2S Unlocked RXP3 OLRCK SPDIF I2S Good Signal 47.5 DIG 3:COAXIAL SCLK...
  • Page 30 DIGITAL AUDIO 751120 SCH 3 of 3 J10:1 J3:12 DA-L 3.24V 3.24V 3.24V R176 R173 J10:5 J3:8 1.5K 1000pF R174 AUDIO OPEN 100K J10:7 J3:6 15V-OP J10:3 DA-R J3:10 330pF 1.82K 1.82K 1.5K U4:1 1.65V -2.75V -1.38V -14.5V-OP U8:2 -1.38V -15V-OP 1.82K 1.82K...
  • Page 31 DIGITAL AUDIO 751120 PCB...
  • Page 32 BACKUP PS 751185 SCH 100V 50/60Hz 089132 T1AL 110-120V 50/60Hz 089141 T800mAL 220-240V 50/60Hz 089126 T500mAL AC LINE FILTER AC LINE J2:1 J6:1 +VBU 300mA J6:2 PRIMARY 3300uF POWER J24:3 J5:1 +VBU J24:2 +VBU AC N 300mA J2:2 J5:2 J24:1 J5:3 VOLTAGE SELECTION JUMPERS 110V...
  • Page 33 BACKUP PS 751185 PCB...
  • Page 34 POWER SUPPLY 751121 SCH J1:1 20V_UNREG J7:7 20V_UNREG 3.0A J7:7 J7:6 20V_UNREG J7:6 J7:5 J1:2 J7:5 J7:4 -20V_UNREG J7:4 SEC 1 J7:3 J7:3 R195 J7:2 -20V_UNREG J7:2 J1:3 J7:1 -20V_UNREG J7:1 3.0A J6:7 J1:4 J6:7 7V_UNREG 7V_UNREG J6:6 J6:6 7V_UNREG 3.0A J6:5 J6:5...
  • Page 35 POWER SUPPLY 751121 PCB...
  • Page 36 HEADPHONE 751196 SCH LEFT J20:12 J2:1 LEFT J20:11 J2:2 J20:10 J2:3 J20:9 J2:4 Tip=Left Ring=Right J20:8 J2:5 Headphone Jack J20:7 J2:6 RIGHT J20:6 J2:7 RIGHT J20:5 J2:8 J20:4 J2:9 J20:3 J2:10 J20:2 J2:11 J20:1 J2:12...
  • Page 37: 8-Band Eq

    8-BAND EQUALIZER 751118 SCH and PCB 8 BAND EQ 220pF 100uF 3.32k L-METER 22.1K 18.2K L FROM J1:1 U1:1 U2:1 U3:1 U4:1 U5:1 U6:1 U7:1 U8:1 U9:1 J17:12 10uF 4.7uF 2.2uF .47uF .22uF .1uF .033uF .22uF J1:6 100k 100k 100k 100k 100k 100k...
  • Page 38: Audio Expansion

    AUDIO EXPANSION 751251 SCH J2:1 47uF L_TO J15:1 47uF L_MAIN + J1:12 J4:1 J21:12 L_MAIN - J4:2 22.1K J21:11 22.1K J15:2 J4:10 J1:11 J21:3 J15:3 R_MAIN + J4:11 47uF J1:10 J21:2 R_MAIN - J4:12 J21:1 J2:2 22.1K 47uF R_TO J15:4 J1:9 J4:7 J21:6...
  • Page 39 AUDIO EXPANSION 751251 PCB...
  • Page 40 METER LIGHTING 750846 SCH and PCB +5.6V J14:12 L J1:12 J15:12 R +5.6V J1:11 J14:11 L J15:11 R +5.6V J1:10 J14:10 L J15:10 R J1:9 J14:9 L J15:9 R J1:8 J14:8 L J15:8 R J1:7 J14:7 L J15:7 R J1:6 J14:6 L J15:6 R J1:5...
  • Page 41: Parts List

    171318 METER 124120 LED GREEN 5MM 30 DEG 058190 (DS4) SPACER LED 112108 METER 124120 CONTACT MCINTOSH SERVICE DEPARTMENT LED GREEN 5MM 30 DEG 058190 (DS5) SPACER LED 112108 ROTARY ENCODER W/CONN ASSY 052139 LED GREEN 5MM 30 DEG 058190 RECEPTACLE INPUT &...
  • Page 42 PARTS LIST (Cont’d.) DISPLAY PCB 751113 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 1K 1/8W 1% 145007 HEADER 2 PIN LATCHING 117766 RES SMD0805 100K 1/8W 1% 145014 HEADER 2 PIN LATCHING 117766 RES SMD0805 100K 1/8W 1% 145014 INDUCTOR 10UF 30% SMD 122438...
  • Page 43 PARTS LIST (Cont’d.) CONTROL PCB 751266 Ref. No. Description Part No. Ref. No. Description Part No. CAP MONO .1UF 50V ±20% X7R SMD 061365 BRKT1 GP3 SCREW TERMINAL PC 117975 CAP MONO .1UF 50V ±20% X7R SMD 061365 CAP ELECT 10UF 50V SMD 066602 CAP MONO .1UF 50V ±20% X7R SMD 061365...
  • Page 44 PARTS LIST (Cont’d.) CONTROL PCB 751266 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. TRANSISTOR NPN A05 SMD 132333 HEADER 7 PIN SHROUDED 117910 TRANSISTOR NPN A05 SMD 132333 HEADER 7 PIN SHROUDED 117910 TRANSISTOR NPN A05 SMD 132333 CONN 12 PIN FFC SMD 118001...
  • Page 45 PARTS LIST (Cont’d.) CONTROL PCB 751266 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R124 RES SMD0805 22.1 1/8W 1% 145003 RES SMD0805 47.5K 1/8W 1% 145013 R125 RES SMD0805 22.1 1/8W 1% 145003 RES SMD0805 150K 1/8W 1% 145037 R126 RES SMD0805 22.1 1/8W 1%...
  • Page 46 R221 RES SMD0805 150 1/8W 1% 145019 CRYSTAL 18.432000MHZ 20PF SMD 180065 R222 RES SMD0805 22.1K 1/8W 1% 145012 FIRMWARE V3.00 C50 230032 R223 RES SMD0805 150 1/8W 1% 145019 R224 RES SMD0805 22.1K 1/8W 1% 145012 AUDIO PCB 751115...
  • Page 47 PARTS LIST (Cont’d.) AUDIO PCB 751115 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. CAP ELECT 10UF 16V 066580 CAP MPF 0.0015UF 5% 63VDC 064302 CAP 22PF 200V 10% NPO SMD0805 061367 CAP POLYPROP 0.033UF 63V 2.5% 064446 CAP ELECT 10UF 16V 066580...
  • Page 48 PARTS LIST (Cont’d.) AUDIO PCB 751115 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. C209 CAP ELECT 47UF 35V 066446 C150 CAP 22PF 200V 10% NPO SMD0805 061367 C210 CAP ELECT 100UF 25V 066573 C151 CAP 22PF 200V 10% NPO SMD0805 061367 C211 CAP ELECT 100UF 25V...
  • Page 49 PARTS LIST (Cont’d.) AUDIO PCB 751115 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. TRANSISTOR NPN A05 SMD 132333 RELAY REED SPST-NO 5V 1.2A 087078 TRANSISTOR PNP A55 SMD 132334 RELAY REED SPST-NO 5V 1.2A 087078 TRANSISTOR PNP A55 SMD 132334 RELAY REED SPST-NO 5V 1.2A 087078...
  • Page 50 PARTS LIST (Cont’d.) AUDIO PCB 751115 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES MF 22.1 OHM 1% 1/4W 144554 RES SMD0805 100K 1/8W 1% 145014 RES MF 22.1 OHM 1% 1/4W 144554 RES SMD0805 100K 1/8W 1% 145014 RES MF 22.1 OHM 1% 1/4W 144554...
  • Page 51 PARTS LIST (Cont’d.) AUDIO PCB 751115 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R159 RES SMD0805 3.32K 1/8W 1% 145026 R241 RES MF 10 OHM 1% 1/4W 144553 R172 RES SMD0805 3.32K 1/8W 1% 145026 R242 RES SMD0805 6.81K 1/8W 1% 145029 R173...
  • Page 52 PARTS LIST (Cont’d.) AUDIO PCB 751115 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R265 RES MF 1M 1% 1/4W 144577 CONN XLR FEM VERT PCB LATCH 117813 RECEPTACLE XLR MALE 117669 R268 RES MF 1.91K .5% 1/4W 144613 RECEPTACLE XLR MALE 117669...
  • Page 53 PARTS LIST (Cont’d.) DIGITAL AUDIO PCB 751120 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. CAP .01UF 10% 50V X7R SMD0603 061384 FERRITE 1000 OHM 0.5 AMP SMD 076026 CAP ELECT 10UF 50V SMD 066602 FERRITE 1000 OHM 0.5 AMP SMD 076026 CAP ELECT 10UF 50V SMD 066602...
  • Page 54 PARTS LIST (Cont’d.) DIGITAL AUDIO PCB 751120 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R180 RES SMD0805 10K 1/8W 1% 145010 RES SMD0805 475 1/8W 1% 145020 R181 RES SMD0805 22.1K 1/8W 1% 145012 RES SMD0805 22.1K 1/8W 1% 145012 R182 RES SMD0805 47.5K 1/8W 1%...
  • Page 55 PARTS LIST (Cont’d.) POWER PCB 751121 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. HEADER 7 PIN SHROUDED 117910 CAP MONO .1UF 50V ±20% X7R SMD 061365 PCB1 PC BD POWER 130057 CAP ELECT 10UF 50V 066445 RES CF 0 OHM 5% 1/4W 141554 DIODE SMALL SIGNAL 4148 SMD...
  • Page 56 PARTS LIST (Cont’d.) 8-BAND EQ PCB 751118 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 47.5K 1/8W 1% 145013 JACK DUAL RCA 118020 CONN 12 PIN FFC 117907 RES SMD0805 100K 1/8W 1% 145014 JACK DUAL RCA 118020 RES SMD0805 100K 1/8W 1% 145014...
  • Page 57: Repacking Instruction

    If a shipping carton or any of the interior part(s) are needed, please call or write Customer Service Department of McIntosh Laboratory. Refer to page 3. Please see the Part List for the correct part numbers.
  • Page 58 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.

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