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McIntosh C49 Service Manual
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McIntosh C49 Service Manual

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Performance Specifications ..........................................2
Notes ...........................................................................2
Rear Panel ...................................................................3
Section Location ..........................................................4
Block Diagram .......................................................5 - 6
Interconnection Diagram ........................................7 - 8
SERVICE MANUAL
C49
AUDIO PREAMPLIFIER
SERIAL NO. AHF1001 And Above
CONTENTS
Control Schematic and PCB ..................................9 - 16
Digital Schematic and PCB .................................17 - 24
Audio Schematic and PCB ..................................25 - 38
Dsply/L&R Pshbtns/Hdphn/L&R Mtr Schematic and PCB .39 - 44
Parts List .............................................................45 - 56
Repacking Instruction ................................................57
C49

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Summary of Contents for McIntosh C49

  • Page 1: Table Of Contents

    AUDIO PREAMPLIFIER SERIAL NO. AHF1001 And Above CONTENTS Performance Specifications ..........2 Control Schematic and PCB ........9 - 16 Notes ................2 Digital Schematic and PCB .........17 - 24 Rear Panel ..............3 Audio Schematic and PCB ........25 - 38 Section Location ............4 Dsply/L&R Pshbtns/Hdphn/L&R Mtr Schematic and PCB .39 - 44 Block Diagram ............5 - 6 Parts List .............45 - 56...

  • Page 2: Performance Specifications

    Standby Power, less than 0.5 watts Phono MM - 50 to 800pF, in 50pF steps; Note: Refer to the rear panel of the C49 for the correct voltage. 47K ohms Phono MC - 25, 50, 100, 200, 400 or 1,000 ohms;...

  • Page 3: Rear Panel

    DO NOT OPEN COAX 2 COAX 1 120V 50/60Hz TRIG 2 PASSTHRU RS232 McINTOSH LABORATORY, INC. BINGHAMTON, NY 13903 ATTENTION: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR HANDCRAFTED IN USA WITH US AND IMPORTED PARTS 30 WATTS DA1 DIGITAL AUDIO MODULE...

  • Page 4: Section Location

    SECTION LOCATIONS Top View DISPLAY AUDIO Bottom View R PUSHBUTTON L PUSHBUTTON HEADPHONE CONTROL DIGITAL...

  • Page 5: Block Diagram

    BLOCK DIAGRAM RIAA PREAMP PREAMP RIAA PREAMP ELECTRONIC INPUT TONE OUTPUT VOLUME PREAMP PREAMP BUFFER SELECTOR CONTROL CONTROL BAL 2 BAL 1 INPUT VOLUME COAX SPDIF SELECTOR SELECTOR RECEIVER/ SAMPLE RATE OPTICAL 2 HEAD SOURCE CONVERTER HEADPHONE PHONE SELECTOR FRONT PANEL OPTICAL 1 PUSHBUTTON 3.3V...
  • Page 6 INTERCONNECT DIGITAL AUDIO DIGITAL AUDIO DISPLAY CONTROL AUDIO DISPLAY CONTROL AUDIO VOLTAGE CONVERSIONS VOLTAGE JMP1 100V T1AL 250V 17198500 110V/120V T800mAL 250V 17198600 220V T500mAL 250V 17198700 230V/240V T500mAL 250V 17198800 VOLTAGE CONVERSIONS VOLTAGE JMP1 100V T1AL 250V 17198500 110V/120V T800mAL 250V 17198600 JMP1...
  • Page 7 CONTROL 752346 SCH 1 of 3 +3 .3V M J9 :1 J9 :2 +5 V +5 V J9 :3 C 51 U SB1 - TC K R 31 .1µF M ET EN A 22.1 J9 :16 +5 V TM S M ET ENA TD O AU D D ET...
  • Page 8 CONTROL 752346 SCH 2 of 3 AC L J2:1 350mA +V BU PRIMARY VOUT +3.3V BU +5V D VFD ON ON/OFF 3300µF .1µF 470µF W HT AC N .1µF 150k 100pF 470µF J2:2 350mA 47.5k TEST ON LY APPLY 12VD C TO ENERGI ZE RELAY AC DET EC TOR W ITH NO AC POW ER...
  • Page 9 CONTROL 752346 SCH 3 of 3 +V PC R 63 R 79 C 63 22.1k .1µF +3 .3VBU +V PC R 70 TR G 3 PC Q 16 +V PC J1 1:1 22.1k U 27 D 13 R 94 R 84 4.75k 2.21k POWER...
  • Page 10 CONTROL 752346 PCB...
  • Page 11 DIGITAL 751973 SCH 1 of 3 USB INPU T DSD 128 PW R +3.3VD +3. 3VD +3. 3VD +3.3VD DSD128 FL USB DM DSD 64 R105 R109 +3.3VD +3.3VD USB DP DS10 DSD FL R101 R121 GN D USB ON MCT ON CASE I2C DA...
  • Page 12 DIGITAL 751973 SCH 2 of 3 (221) 6-32 6-32 6-32 6-32 .1µF C108 .1µF (1.5k) 1000pF 1.58k C109 .1µF +7 V D A .1µF +7 V D A -7V D A .1µF +7 V D A U8:1 (1.5k) (3.32k) .1µF .1µF .1µF 330pF...
  • Page 13 DIGITAL 751973 SCH 3 of 3 +2. 5V RESET VOUT +3.3VD 0 RESET 22µF 22µF +3.3VD +3.3VD 10µF 10µF .1µF .1µF .1µF .1µF +3.3VD SRC_UNLOCK COAX 1 47.5K SAIF SAOF 12pF 27MHz 12pF 3.32k 4.75k 1.96k 1.58k BYPASS MS_SEL OPT I 1 .01µF .01µF ILRCK...
  • Page 14 DIGITAL 751973 PCB...
  • Page 15 AUDIO 752349 SCH 1 of 6 R107 R111 R125 2.21k 22.1 +1 5V -15V +7 .5V -7.5V +1 5V C125 R144 10µF +7 .5V +7 .5V +7 .5V +7 .5V MC R R108 R112 R126 2.21k 22.1 +7 .5V -7.5V -15V RMCG N D R101...
  • Page 16 AUDIO 752349 SCH 2 of 6 +5 V C185 C191 R245 22µF 22µF R225 +1 5V 2 A GN D R223 R282 U24:1 C186 R246 22µF A GN D A GN D L OUT U24:2 A GN D C192 A GN D -1 5V 2 22µF C193...
  • Page 17 AUDIO 752349 SCH 3 of 6 -1 5V IN R 49 C 54 10µF 22.1k C 28 10µF C 55 R 50 10µF 22.1k +1 5V IN -1 5V IN U 2:1 +1 5V IN D 18 D 39 D 40 R 35 +5 V BAL 1...
  • Page 18 AUDIO 752349 SCH 4 of 6 R269 4.75k +7 .5V J15:11 R274 -7 .5V 4.75k -7 .5V J15:13 +7 .5V TONE CONTROL C214 R270 R275 C211 10µF 10µF J15:14 DAC LEFT L VOL R VOL J15:15 C202 10µF C207 10µF -7 .5V SWC A SWC B...
  • Page 19 AUDIO 752349 SCH 5 of 6 +1 5H P +1 5H P R173 R179 49.9K L O UT C174 R198 470µF 95.3 U19:2 R199 95.3 C164 .22µF C169 470pF -1 5H P -1 5H P R171 R174 LEFT H EADPHONE AMP R184 +1 5V +1 5H P...
  • Page 20 AUDIO 752349 SCH 6 of 6 +5 V Q 53 +3 .3V BU +5 V +3 .3V BU +3 .3V BU +3 .3V BU +3 .3V BU +3 .3V BU +5 V +5 V U 20 U 23 VD D VD D SD A I2 C D A 2...
  • Page 21 AUDIO 752349 PCB...
  • Page 22 DISPLAY/LEFT PUSHBUTTON/RIGHT PUSHBUTTON/HEADPHONE 751756 SCH 1 of 2 LOGO 2.74k 2.74k 2.74k DS16 DS17 DS18 INPUT VOLUME 2.74k 2.74k 2.74k 2.74k 2.74k 2.74k 2.74k DS24 DS19 DS20 DS21 DS22 DS23 DS25 10µH J9:2 +5VD 100µF .1µF J9:1 J9:6 VFD C L J9:4 VFD CS D I SPLAY...
  • Page 23 DISPLAY/LEFT PUSHBUTTON/RIGHT PUSHBUTTON/HEADPHONE 751756 SCH 2 of 2 4.75k 2 2 .1 HP DET J1:23 HP DET U 3:2 HDPH 1000pF 1000pF .1µF 4-40 KEY REF J1:22 4-40 AD R EF 3.3V NO HDPH JACK G P1 1.65V NO HDPH PLUGGED IN 6 -3 2 VF D CL J1:16...
  • Page 24 DISPLAY/LEFT PUSHBUTTON/RIGHT PUSHBUTTON/HEADPHONE 751756 PCB...

  • Page 25: Parts List

    PARTS LIST INTERCONNECT Ref. No. Description Part No. Ref. No. Description Part No. CABLE ASSY AC CAP MONO .1uF 50V +/-20% X7R SMD 061365 173289 CABLE ASSY FFC 18 COND 70MM 171317 CAP MONO .1uF 50V +/-20% X7R SMD 061365 CABLE ASSY 18 COND 70MM 171317 CAP MONO .1uF 50V +/-20% X7R SMD...
  • Page 26 PARTS LIST (Cont’d.) CONTROL PCB 752346 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. TERMINAL PC MOUNT 4-40 118115 TRANSISTOR NPN A05 SMD 132333 CONN PCB MOUNT POWER RED 117719 TRANSISTOR NPN A05 SMD 132333 CONNECTOR 2 PIN HEADER 11.88MM 118026 TRANSISTOR NPN A05 SMD 132333...
  • Page 27 R101 RES SMD0805 22.1K 1/8W 1% 145012 CRYSTAL 12.00MHZ SMD 180103 R102 RES SMD0805 22.1K 1/8W 1% 145012 FIRMWARE V1.00 C49 230279 R105 RES TF 22.1 .5% .1W SMD 145133 R106 RES TF 22.1 .5% .1W SMD 145133 DIGITAL PCB 751973 R107 RES TF 22.1 .5% .1W SMD...
  • Page 28 PARTS LIST (Cont’d.) DIGITAL 751973 (Cont’d.) Ref. No. Description Part Ref. No. Description Part CAP 330pF 100V 5% SMD0805 061377 CAP MONO .1uF 50V +\- 20% X7R SMD 061365 CAP 10uF 20% 16V X5R SMD0805 061392 CAP 22uF 6.3V 20% SMD0805 061397 CAP 330pF 100V 5% SMD0805 061377...
  • Page 29 PARTS LIST (Cont’d.) DIGITAL 751973 (Cont’d.) Ref. No. Description Part Ref. No. Description Part FERRITE 600 OHM 1 AMP SMD 076026 RES SMD0805 475 1/8W 1% 145020 FERRITE 600 OHM 1 AMP SMD 076026 RES TF 75 1% 0.1W SMD0805 145090 FERRITE 600 OHM 1 AMP SMD 076026...
  • Page 30 PARTS LIST (Cont’d.) DIGITAL 751973 (Cont’d.) Ref. No. Description Part Ref. No. Description Part R103 RES TF 10K 1% 0.1W SMD0805 145061 CRYSTAL 27MHZ SMD 180100 R104 RES TF 10K 1% 0.1W SMD0805 145061 CRYSTAL 24MHZ SMD 180102 R105 RES TF 10K 1% 0.1W SMD0805 145061 CRYSTAL 12.00MHZ SMD 180103...
  • Page 31 PARTS LIST (Cont’d.) AUDIO PCB 752349 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. CAP 100pF 200V 5% SMD0805 061390 C128 CAP MONO .1uF 50V +/-20% X7R SMD 061365 CAP 100pF 200V 5% SMD0805 061390 C129 CAP MONO .1uF 50V +/-20% X7R SMD 061365 CAP 100pF 200V 5% SMD0805 061390...
  • Page 32 PARTS LIST (Cont’d.) AUDIO PCB 752349 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. DIODE SMALL SIGNAL 4148 SMD 070199 C186 CAP ELECT 22UF 100V 066574 DIODE SMALL SIGNAL 4148 SMD 070199 C187 CAP ELECT 22UF 100V 066574 DIODE SMALL SIGNAL 4148 SMD 070199...
  • Page 33 PARTS LIST (Cont’d.) AUDIO PCB 752349 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RELAY REED FORM 1C 5V 125 OHM 087056 TRANSISTOR NPN A05 SMD 132333 RELAY REED DPST-NO 1.2A 5VDC 087089 TRANSISTOR NPN 2SC5994 SMD 132341 RELAY REED DPST-NO 1.2A 5VDC 087089...
  • Page 34 PARTS LIST (Cont’d.) AUDIO PCB 752349 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R127 RES MF 806 OHM 1% 1/4W 144512 RES SMD0805 22.1K 1/8W 1% 145012 R128 RES MF 806 OHM 1% 1/4W 144512 RES TF 100K 1% 0.1W SMD0805 145062 R129 RES SMD0805 4.75K 1/8W 1%...
  • Page 35 PARTS LIST (Cont’d.) AUDIO PCB 752349 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R186 RES SMD0805 4.75K 1/8W 1% 145008 R250 RES TF 100K 1% 0.1W SMD0805 145062 R251 RES TF 100 1% 0.1W SMD0805 145060 R187 RES SMD0805 4.75K 1/8W 1% 145008...
  • Page 36 PARTS LIST (Cont’d.) DSPLY/L PSHBTN/R PSHBTN/HDPHN (Cont’d.) Ref. No. Description Part No. /L MTR/R MTR PCB 751756 CAP ELECT 10UF 50V SMD 066602 RES TF 22.1 .5% .1W SMD 145133 CAP MONO .1uF 50V +/-20% X7R SMD 061365 RES SMD0805 150 1/8W 1% 145019 CAP MONO .1uF 50V +/-20% X7R SMD 061365...

  • Page 37: Repacking Instruction

    If a shipping carton or any of the interior 017937 Plastic foot part(s) are needed, please call or write Customer 400159 #10-32 x 3/4” screw Service Department of McIntosh Laboratory. Please see the Part List for the correct part numbers. 404080 #10 Flat washer FOAM PLUG...
  • Page 38 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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