McIntosh C2500 Service Manual
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Performance Specifications ..........................................2
Notes ...........................................................................3
Rear Panel ...................................................................4
Section Location ..........................................................4
Block Diagram .......................................................5 - 6
Interconnection Diagram ........................................7 - 8
Display Schematic and PCB..................................9 - 18
Control Schematic and PCB ................................19 - 30
Audio Schematic and PCB ..................................31 - 42
C2500
SERIAL NO. ADF1001 And Above
CONTENTS
Balanced I/O Schematic and PCB .......................43 - 46
Digital Audio Schematic and PCB .......................47 - 54
Backup PS Schematic and PCB ...........................55 - 58
Power Schematic and PCB ..................................59 - 62
Tube Schematic and PCB ....................................63 - 70
Audio Expansion Schematic and PCB ................71 - 74
Meter Light Schematic and PCB ..........................75 - 76
Parts List .............................................................77 - 92
Repacking Instruction ................................................93
C2500

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Summary of Contents for McIntosh C2500

  • Page 1: Tube Preamplifier

    C2500 C2500 TUBE PREAMPLIFIER SERIAL NO. ADF1001 And Above CONTENTS Performance Specifications ..........2 Balanced I/O Schematic and PCB .......43 - 46 Notes ................3 Digital Audio Schematic and PCB .......47 - 54 Rear Panel ..............4 Backup PS Schematic and PCB ......55 - 58 Section Location ............4...
  • Page 2: Performance Specifications

    Input Impedance Standby Power, less than 0.5 watts High Level, 22K ohms unbalanced, 44k ohms balanced Note: Refer to the rear panel of the C2500 for the correct voltage. Phono MM, 47K ohms; 50 to 750pF, in 50pF steps Overall Dimensions Phono MC, 25, 50, 100, 200, 400 or 1,000 ohms;...
  • Page 3: Rear Panel

    C2500 REAR PANEL...
  • Page 4 SECTION LOCATIONS TOP VIEW WITH COVER REMOVED AUDIO EXPANSION AUDIO BALANCED I/O TUBE DISPLAY METER LIGHT BOTTOM VIEW WITH COVER REMOVED DIGITAL AUDIO CONTROL BACKUP PS POWER...
  • Page 5: Block Diagram

    C2500 TUBE PREAMPLIFIER BLOCK DIAGRAM...
  • Page 6 INTERCONNECT CA27 CA26 CA12 CA17 CA28 TUBE CA18 CA24 CA25...
  • Page 7 C2500 TUBE PREAMPLIFIER 2 DISPLAY 751456 SCH 1 OF 4 FRONT PANEL 2X20 VFD ASSY 750932 = 058195 + 9 pin conn (117986) ILLUMINATION -15V J9:18 Right PB Input Left PB Volume Logo J9:17 .1µF 3.3V BU J9:16 J9:15 2.21K...
  • Page 8 2 DISPLAY 751456 SCH 2 OF 4 -15V .1µF 220µF .1µF .1µF C170 R249 LEFT R113 LEFT 2.21 METER RECTIFIER L-METER .01µF METER BUFFER R100 47µF 22.1K U11:1 100K LEFT 100K -3.7V U10:2 METER DRIVER -3.7V U11:2 R251 R108 (806 ohm) 221K -.5V J4:4...
  • Page 9 C2500 TUBE PREAMPLIFIER 2 DISPLAY 751456 SCH 3 OF 4 J14:11 J14:12 J14:2 J14:1 J14:4 J14:5 J14:6 J14:7 J14:8 J14:9 J15:12 METER ILLUMINATION DRIVER J15:11 2.21K J15:2 METER LEDs ON J15:1 J15:4 J15:5 J15:6 J15:7 J15:8 J15:9...
  • Page 10 2 DISPLAY 751456 SCH 4 OF 4 Left Pushbutton PCB Right Pushbutton PCB PROC TONE BYPASS TRIM MUTE OUT 1 OUT 2 STANDBY J6:4 J6:9 J6:10 J6:5 J6:2 J6:1 J6:6 J6:3 J6:11 J6:7 J6:8 J6:12 J10:9 J10:10 J10:8 J10:12 J10:4 J10:5 J10:2 J10:1 J10:6 J10:3 J10:11 J10:7...
  • Page 11 C2500 TUBE PREAMPLIFIER 2 DISPLAY 751456 PCB...
  • Page 12 3 CONTROL 751457 SCH 1 of 5 DATA-IN RING R146 SLEEVE IR-IN RING 3.3V BU IR SENSOR SLEEVE IR_REAR Vout Active Low Output Address=0 LVC-AND 10uF 3.3V BU R156 22.1 .1UF I2C_SDA 3.3V BU R157 22.1 I2C_SCL 058174 RA HOLDER Disabled TUNER-ENABLE Data Port Enabled...
  • Page 13 C2500 TUBE PREAMPLIFIER 3 CONTROL 751457 SCH 2 of 5 J4 :1 USB+ J4 :2 USB- J4 :3 .1UF 3.3V BU J4 :4 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...
  • Page 14 3 CONTROL 751457 SCH 3 of 5 MAIN 12V_PC MAIN RING MAIN_LIGHT_PC POWER CONTROL MAIN_PC SLEEVE DGND MAIN_LIGHT_PC LIGHTS OFF LIGHTS OFF R179 MAIN_PC-EN LIGHT_CTL 2.21K 4.75K 22.1K LIGHTS OFF LIGHT_CTL_IN MAIN_PC (Micro provides pullup) R198 LIGHTS OFF LIGHT CTL IN BUFFER 100K PASS-THRU...
  • Page 15 C2500 TUBE PREAMPLIFIER 3 CONTROL 751457 SCH 4 of 5 133717, 1.25A Audio Sw itching J7:7 Audio Outputs 22.1 ON/OFF Power_On ? mA Max USB Audio J7:6 50k internal pulldown Low = Enable J7:5 High = Disable J7:4 18.2K J7:3...
  • Page 16 3 CONTROL 751457 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 J11:4 J11:9 3.3V J11:5 J11:8 J11:6 J11:7 J11:7 J11:6 J11:8 J11:5 3.3V BU VCC(A) VCC(B) 3.3V BU 3.3V BU VCC(A) VCC(B)
  • Page 17 C2500 TUBE PREAMPLIFIER 3 CONTROL 751457 PCB...
  • Page 18 4 AUDIO 751458 SCH 1 of 5 -15VL1 10µF C105 L_MAIN+ 1 LEFT + J2:1 10µF J1:18 L-MAIN C109 + BALANCED AMP C117 R133 5.0v 47µF 47µF 221K U10:1 R129 10µF R117 4.99k 221K 1 LEFT - J2:2 J1:17 15VL1 221K C118 R134...
  • Page 19 C2500 TUBE PREAMPLIFIER 4 AUDIO 751458 SCH 2 of 5 FROM CONTROL FROM CONTROL J12:8 J12:7 J12:6 J12:5 J12:4 J12:3 J12:2 J12:1 J13:8 J13:7 J13:6 J13:5 J13:4 J13:3 J13:2 J13:1 J3:6 3.3VBU1 OUTPUT J3:8 3.3VBU1 5.0v 5.0v 3.3VBU2 C132 DECODER 3.3VBU1...
  • Page 20 4 AUDIO 751458 SCH 3 of 5 1.5k 5VMC 1000µF 22pF 5VMC 1000pF MC OUT LEFT MC Jx:1 J22:3 MC LEFT -5VMC 100pF 1000pF R402 1.5k IN OUT 5VMC OPEN -5VMC J1:1 C210 100µF R404 MC LEFT 1000µF Jx:2 R403 J22:2 OPEN IN OUT...
  • Page 21 C2500 TUBE PREAMPLIFIER 4 AUDIO 751458 SCH 4 of 5 R109 J10:1 L MM IN J23:1 J1:1 J23:2 R107 J1:2 47.5k C224 L MM OUT J26:12 J4:1 MM-L MM PH R405 J26:6 221K J4:2 J26:10 J4:4 AGND C225 AGND R MM OUT...
  • Page 22 4 AUDIO 751458 SCH 5 of 5 FROM CONTROL Add Pwr On Attn, for tube DC mute?? Remove resistors C186 J16:12 J16:11 J16:10 J16:9 J16:8 J16:7 J16:6 J16:5 J16:4 J16:3 J16:2 J16:1 22pF C148 C190 22pF -15v Lef t Lef t .1µF C206 J19:1...
  • Page 23 C2500 TUBE PREAMPLIFIER 4 AUDIO 751458 PCB...
  • Page 24 5 BALANCED I/O 751117 SCH 1 LEFT + J1:18 J2:2 J2:1 1 LEFT + J11:17 J1:17 1 LEFT- J2:1 J2:2 1 LEFT - J11:18 LEFT LEFT 2 LEFT+ J1:14 J2:5 J2:14 2 LEFT + J11:5 J1:13 2 LEFT- J2:6 J2:13 2 LEFT - J11:6 BALANCED...
  • Page 25 C2500 TUBE PREAMPLIFIER 5 BALANCED I/O 751117 PCB...
  • Page 26 6 DIGITAL AUDIO 751120 SCH 1 of 3 J11:12 J11:1 Not Used USBUSERID Not Used SPIO_MISO J11:11 J11:2 -15V Not Used SPIO_SCK Not Used SPIO_MOSI J11:10 J11:3 Not Used SPIO_CS3 Reset J11:9 J11:4 3.3V R177 OPEN J11:8 J11:5 .1uF RESET_N .01uF VDDCORE J11:7...
  • Page 27 C2500 TUBE PREAMPLIFIER 6 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 LRCLK .1uF DIG 4:COAXIAL J6:2 USB I2S Unlocked RXP3...
  • Page 28 6 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 J10:7 100K J3:6 15V-OP J10:3 J3:10 DA-R 330pF 1.5K 1.82K 1.82K U4:1 1.65V -2.75V -1.38V -14.5V-OP U8:2 -1.38V -15V-OP 1.5K...
  • Page 29 C2500 TUBE PREAMPLIFIER 6 DIGITAL AUDIO 751120 PCB...
  • Page 30 7 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...
  • Page 31 C2500 TUBE PREAMPLIFIER 7 BACKUP PS 751185 PCB...
  • Page 32 8 POWER 751459 SCH POWER TRANSFORMER 23.5V J1:1 IN OUT 1.85A C104 C108 4700µF .1uF 220µF POSITIVE 18 VOLT REGULATOR J7:7 6.49k .5% J1:2 J7:6 SEC 1 J7:5 4700µF R195 J7:4 J1:3 J7:3 -23.5V -18V 1.85A -18V IN OUT -18V J7:2 C103 C107...
  • Page 33 C2500 TUBE PREAMPLIFIER 8 POWER 751459 PCB...
  • Page 34 9 TUBE 751461 SCH 1 of 3 Rename high voltage nets to closely match measurements 157V 47.5k 157V 145V 47.5k LEFT PHONO AMP 33.2k 157V 10µF 145V 10pF 1µF L MM OUT J2:12 105V J4:1 267k 475k .047µF #132352 V1:2 L MM IN V1:1 J3:1...
  • Page 35 C2500 TUBE PREAMPLIFIER 9 TUBE 751461 SCH 2 of 3 157V 33.2k LEFT 10pF PHONO AMP 145V 157V 1µF L MC OUT J4:12 J2:8 105V 475k 267k .047µF #132352 LEFT MC J7:1 J8:3 V3:2 V3:1 12AX7A 12AX7A 2.21M 47pF 100µF 4.75k...
  • Page 36 9 TUBE 751461 SCH 3 of 3 157V 146V 47.5k 157V 47.5k 146V 10µF 10µF 157V .47µF 475k L MAIN 2 .022µF .022µF J6:9 105V J6:4 267k J6:10 J6:3 #132352 130V KEC BF421-AT/P 100V L MAIN 1 V5:1 V5:2 J16:1 12AX7A 12AX7A J6:12...
  • Page 37 C2500 TUBE PREAMPLIFIER 9 TUBE 751461 PCB...
  • Page 38 10 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 22.1K J21:11 J15:2 J4:10 J1:11 J21:3 J15:3 R_MAIN + 47uF J4:11 J1:10 J21:2 R_MAIN - J4:12 J21:1 J2:2 22.1K 47uF R_TO J15:4 J1:9 J4:7...
  • Page 39 C2500 TUBE PREAMPLIFIER 10 AUDIO EXPANSION 751251 PCB...
  • Page 40 11 METER LIGHT 751135 SCH and PCB J14:12 L +5.6V 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...
  • Page 41: Parts List

    C2500 PARTS LIST INTERCONNECT Ref No. Description Part No. Ref No. Description Part No. DIODE ESD SUPPRESSOR SMD 070198 DIODE SMALL SIGNAL 4148 SMD 070199 DIODE SMALL SIGNAL 4148 SMD 070199 DIODE SMALL SIGNAL 4148 SMD 070199 DIODE SMALL SIGNAL 4148 SMD...
  • Page 42 PARTS LIST cont’d. DISPLAY PCB 751456 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. GROMMET 078031 R103 RES SMD0805 150K 1/8W 1% 145037 R105 RES SMD0805 150K 1/8W 1% 145037 SENSOR IR 38KHZ 3V-5V RA 121066 R106 “POT 1/4””...
  • Page 43 C2500 PARTS LIST cont’d. CONTROL PCB 751457 Ref No. Description Part No. Ref No. Description Part No. CAP MONO .1UF 50V 20% SMD0805 061365 DIODE ESD SUPPRESSOR SMD 070198 CAP ELECT 220UF 25V SMD 066606 DIODE ESD SUPPRESSOR SMD 070198...
  • Page 44 PARTS LIST cont’d. CONTROL PCB 751457 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. JACK HEADPHONE DUAL BLACK 1/8 117825 TRANSISTOR NPN A05 SMD 132333 JACK HEADPHONE DUAL BLACK 1/8 117825 TRANSISTOR NPN A05 SMD 132333 JACK HEADPHONE DUAL BLACK 1/8 117825 TRANSISTOR NPN A05 SMD 132333...
  • Page 45 C2500 PARTS LIST cont’d. CONTROL PCB 751457 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. R133 RES SMD0805 22.1 1/8W 1% 145003 RES SMD0805 150K 1/8W 1% 145037 R134 RES SMD0805 10 1/8W 1% 145017 RES SMD0805 47.5K 1/8W 1%...
  • Page 46 CRYSTAL 18.432000MHZ 20PF SMD 180065 R224 RES SMD0805 22.1K 1/8W 1% 145012 R225 RES SMD0805 150 1/8W 1% 145019 FIRMWARE V1.00 C2500 230039 R226 RES SMD0805 22.1K 1/8W 1% 145012 ASSY SMD CONTROL 710173 R231 RES SMD0805 22.1 1/8W 1%...
  • Page 47 C2500 PARTS LIST cont’d. AUDIO PCB 751458 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. CAP 100PF 50V SMD0805 061316 C130 CAP 100PF 50V SMD0805 061316 CAP 100PF 50V SMD0805 061316 C131 CAP 100PF 50V SMD0805 061316...
  • Page 48 PARTS LIST cont’d. AUDIO PCB 751458 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. C200 CAP ELECT 470UF 16V 066508 DIODE SMALL SIGNAL 4148 SMD 070199 DIODE SMALL SIGNAL 4148 SMD 070199 C201 CAP ELECT 470UF 16V 066508 C202 CAP MONO .1UF 50V 20% X7R SMD0805 061365...
  • Page 49 C2500 PARTS LIST cont’d. AUDIO PCB 751458 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. RELAY REED SPST-NO 5V 1.2A 087078 TRANSISTOR PCH 60V J174 132320 RELAY REED SPST-NO 5V 1.2A 087078 TRANSISTOR PCH 60V J174 132320 RELAY REED SPST-NO 5V 1.2A...
  • Page 50 PARTS LIST cont’d. AUDIO PCB 751458 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. R122 RES MF 2.21 OHM 1% 1/4W 144607 RES MF 2.21K 1% 1/4W 144584 R123 RES MF 2.21 OHM 1% 1/4W 144607 RES MF 1K 1% 1/4W 144513 R124 RES MF 2.21 OHM 1% 1/4W...
  • Page 51 C2500 PARTS LIST cont’d. AUDIO PCB 751458 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. R193 RES SMD0805 47.5K 1/8W 1% 145013 R307 RES SMD0805 10K 1/8W 1% 145010 R194 RES SMD0805 47.5K 1/8W 1% 145013 R404...
  • Page 52 PARTS LIST cont’d. BALLANCED I/O PCB 751117 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. CONN 18 PIN FFC SMD 118003 CAP .1UF 10% 50V X7R SMD0603 061385 CONN XLR FEM VERT PCB LATCH 117813 CAP .1UF 10% 50V X7R SMD0603 061385 CONN XLR FEM VERT PCB LATCH 117813...
  • Page 53 C2500 PARTS LIST cont’d. DIGITAL AUDIO PCB 751120 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. RES SMD0805 47.5 1/8W 1% 145004 INDUCTOR 3.3UH 375MA SMD 122428 RES SMD0805 2.21K 1/8W 1% 145024 FERRITE 1000 OHM 0.5 AMP SMD...
  • Page 54 PARTS LIST cont’d. DIGITAL AUDIO PCB 751120 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. R174 RES SMD0805 100K 1/8W 1% 145014 CAP POLYPROP .047UF 10% 250VDC 064364 R175 RES SMD0805 22.1 1/8W 1% 145003 C103 CAP MONO .1UF 50V 20% 061346 R176 RES SMD0805 0 1/8W 0%...
  • Page 55 C2500 PARTS LIST cont’d. TUBE PCB 751461 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. CAP ELECT 47UF 35V 066446 TRANSISTOR PNP 300V BF421 132352 CAP ELECT 47UF 35V 066446 TRANSISTOR NPN SILICON 132317 CAP ELECT 10UF 250V...
  • Page 56 PARTS LIST cont’d. TUBE PCB 751461 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. CONN 12 PIN FFC 117907 RES MF 10K 1% 1/4W 144504 JACK DUAL RCA 118020 RES MF 47.5K 1% 1/4W 144526 RECEPTACLE XLR MALE 117686 RES MF 10K 1% 1/4W 144504...
  • Page 57: Repacking Instruction

    If a shipping carton or 404080 #10-7/16” Flat washer any of the interior part(s) are needed, please call or write Cus- tomer Service Department of McIntosh Laboratory. Refer to page 3. Please see the Part List for the correct part numbers.
  • Page 58: Tube Preamplifier

    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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