McIntosh C47 Service Manual
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McIntosh C47 Service Manual

McIntosh C47 Service Manual

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INPUT
PUSH - TRIM
HOLD - SETUP
HEADPHONES
1
OUTPUT
2
Performance Specifications ..........................................2
Notes ...........................................................................2
Rear Panel ...................................................................3
Section Location ..........................................................4
Block Diagram .......................................................5 - 6
Interconnection Diagram ........................................7 - 8
SERVICE MANUAL
C47
AUDIO PREAMPLIFIER
SERIAL NO. AEH1001 And Above
C 4 7 A U D I O P R E A M P L I F I E R
INPUT: USB
25% DSD 128
CONTENTS
TONE
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
VOLUME
TRIM / SETUP
ADJUST
/
MUTE
STANDBY ON
RESET
C47

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  • Page 1: Table Of Contents

    AUDIO PREAMPLIFIER SERIAL NO. AEH1001 And Above INPUT VOLUME C 4 7 A U D I O P R E A M P L I F I E R PUSH - TRIM TRIM / SETUP HOLD - SETUP ADJUST INPUT: USB HEADPHONES OUTPUT TONE...

  • Page 2: Performance Specifications

    High Level - 100dB (Below rated output) Power Requirements MM Phono - 82dB (Below 5mV input) Field AC Voltage conversion of the C47 is not possible. The C47 is MC Phono - 80dB (Below 0.5mV input) factory configured for one of the following AC Voltages: 100 Volts, 50/60Hz at 30 watts...

  • Page 3: Rear Panel

    P R E A M P L I F I E R SERIAL RISK OF ELECTRIC SHOCK DO NOT OPEN NUMBER McINTOSH LABORATORY, INC. BINGHAMTON, NY 13903 TRIG 2 PASSTHRU RS232 HANDCRAFTED IN USA WITH US AND IMPORTED PARTS ATTENTION:...

  • 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 OUTPUT TONE VOLUME PREAMP PREAMP BUFFER CONTROL SELECTOR CONTROL BAL 2 BAL 1 INPUT VOLUME COAX SPDIF SELECTOR SELECTOR RECEIVER/ SAMPLE RATE HEAD OPTICAL 2 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 T800mAL 250V 17198600 JMP1 110V/120V...
  • Page 7 CONTROL 751897 SCH 1 of 3 +3.3VM .1µF 22.1 MET ENA J9:16 USB2 - MET ENA USB - USB + USB2 - USB2 + USB2 + AUD DET J9:11 AUD DET 22.1 ERASE 12pF 22.1 VOL CS J9:15 VOL CS 12.00MHz 22.1 EXT TXD...
  • Page 8 CONTROL 751897 SCH 2 of 3 AC L J2:1 350mA +VBU PRIMARY VOUT 3 +3.3VBU 3300µF .1µF 470µF AC N J2:2 +3.3VBU 350mA .1µF TEST ONLY APPLY 12VDC TO ENERGIZE RELAY AC DETECTOR WITH NO AC POWER +3.3VBU ___ T AB +5VD ON/OFF VFD ON...
  • Page 9 CONTROL 751897 SCH 3 of 3 +VPC 22.1k .1µF +3.3VBU +VPC TRG3 PC +VPC J11:1 22.1k 2.21k 4.75k POWER I2C DA CONTROL DATA 1 I2C CL .1µF 3.32k DATA 6 DATA 5 J11:2 DATA 4 TRIG 3 DATA 3 R103 DATA 1 J15:1 22.1...
  • Page 10 CONTROL 751897 PCB...
  • Page 11 DIGITAL 751757 SCH 1 of 3 6-32 6-32 .1µF R108 1000pF 1.5k +15VDA .1µF +15VDA -15VDA .1µF C105 C106 +15VDA U34:1 .1µF .1µF .1µF R103 330pF 1.5k 3.32k U31:1 -15VDA -15VDA -15VDA +3.3VD C101 R114 47µF U34:2 .0022µF +3.3VD 680µH C103 R112 .1µF...
  • Page 12 DIGITAL 751757 SCH 2 of 3 USB INPUT +3.3VBU DSD 128 +3.3VD +3.3VD +3.3VD +3.3VD DSD128 FL DSD 64 +3.3VD +3.3VD USB DM DSD FL USB DP USB AUDIO 33.2k 33.2k VDD 16 .1µF MAIN MICRO DETACHED USB ON MCT ON SDA 15 ATTACHED I2C DA...
  • Page 13 DIGITAL 751757 SCH 3 of 3 +2.5V VOUT +3.3VD RESET 0 RESET +3.3VD 47µF 47µF 100µH .1µF .1µF .1µF .1µF +3.3VD SRC_UNLOCK SAIF SAOF 18 47.5k 12pF 27MHz 12pF 3.32k 4.75k 1.96k MS_SEL 15 .01µF BYPASS .01µF ILRCK OLRCK RXP3 OLRCK .01µF 47.5...
  • Page 14 DIGITAL 751757 PCB...
  • Page 15 AUDIO 751890 SCH 1 of 6 R107 R111 R125 2.21k 22.1 +1 5V -1 5V +7 .5 V C127 C129 1000µF 1000pF .1µF .1µF R129 C108 C110 4.75k 1000pF 1000pF -7 .5 V +1 5V C125 R144 10µF +7 .5 V +7 .5 V +7 .5 V +7 .5 V...
  • Page 16 AUDIO 751890 SCH 2 of 6 +5 V C191 22µF R245 22µF R225 C185 R241 R243 22.1k 100k +1 5V 2 R223 R282 R244 R242 100k U24:1 22.1k C192 R246 22µF L OUT U24:2 22µF -15V 2 C186 C193 R251 22µF R247 R249...
  • Page 17 AUDIO 751890 SCH 3 of 6 -1 5V IN 10µF 22.1k 10µF 100pF 10µF 22.1k +1 5V IN -1 5V IN U2:1 +1 5V IN .1µF .1µF 100k BAL1 +5 V 100k 100pF 100k R278 100pF BAL 1 10µF 22.1k 10µF 10µF UNBAL 3...
  • Page 18 AUDIO 751890 SCH 4 of 6 R269 4.75k +7 .5V R274 4.75k -7 .5V TONE C ONTROL C214 C211 R270 R275 10µF 10µF L VOL R VOL J15:3 GN D C202 10µF C207 10µF -7 .5V SWC A SW C B -7 .5V L TONE Out A...
  • Page 19 AUDIO 751890 SCH 5 of 6 +1 5H P +1 5H P R186 4.75k R173 R179 49.9K R190 L O UT C174 R198 470µF 95.3 C171 U19:2 .1µF R199 R191 95.3 C164 .22µF R195 49.9 R177 R187 4.75k C162 .22µF C166 C169 22µF...
  • Page 20 AUDIO 751890 SCH 6 of 6 +5 V R211 5.62k +3 .3 V BU +5 V +3 .3 V BU +3 .3 V BU +3 .3 V BU +3 .3 V BU +3 .3 V BU +5 V +5 V C179 R202 .1µF...
  • Page 21 AUDIO 751890 PCB A GND AGND AGND AGND A GND AGND AGND AGND A GND A GND NetJ9_4 NetJ1 0_ 4 NetJ7_4 NetJ8_4 A GND AGND A GND A GND A GND A GND AGND AGND AGND AGND A GND A GND Ne tD2 2_2 NetD21_2...
  • 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. CAP MONO .1uF 50V +/- 20% X7R SMD 061365 CABLE ASSY AC 173289 CAP MONO .1uF 50V +/- 20% X7R SMD 061365 CABLE ASSY 18 COND 70MM 171317 CABLE ASSY 18 COND 70MM 171317...
  • Page 26 PARTS LIST (Cont’d.) CONTROL PCB 751897 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. POLYSWITCH 3.00A 72V 144722 CONN PCB MOUNT POWER RED 117719 POLYSWITCH 3.00A 72V 144722 CONN 23 PIN FFC SMD 118004 POLYSWITCH 1.85A 72V 144716 CONN 12 PIN FFC SMD 118001...
  • Page 27 PARTS LIST (Cont’d.) CONTROL PCB 751743 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 100 1/8W 1% 145005 IC I2C BUS REPEATER SMD 133769 IC EEPROM 256K BITS 3.3V SMD 133709 RES SMD0805 1.5K 1/8W 1% 145022 RES SMD0805 22.1K 1/8W 1% 145012...
  • Page 28 PARTS LIST (Cont’d.) DIGITAL PCB 751757 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. CAP .01uF 50V 20% X7R SMD0805 061372 C101 CAP ELECT 47UF 35V 066446 CAP ELECT 47UF 35V 066446 C102 CAP ELECT 47UF 35V 066446 CAP 100pF 200V 5% SMD0805 061390...
  • Page 29 PARTS LIST (Cont’d.) DIGITAL PCB 751757 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 10K 1/8W 1% 145010 RES SMD0805 47.5K 1/8W 1% 145013 RES SMD0805 10K 1/8W 1% 145010 RES SMD0805 100 1/8W 1% 145005 RES SMD0805 10K 1/8W 1% 145010...
  • Page 30 PARTS LIST (Cont’d.) DIGITAL PCB 751757 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. CAP MONO .1uF 50V +/-20% X7R SMD 061365 IC QUAD 2-INPUT AND GATE SMD 133776 CAP ELECT 47UF 35V 066446 IC SINGLE 2-INPUT AND GATE SMD 133502 CAP ELECT 47UF 35V 066446...
  • Page 31 PARTS LIST (Cont’d.) AUDIO PCB 751890 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. CAP POLYPROP 0.01UF 63V 2.5% 064444 C157 CAP MONO .1uF 50V +/-20% X7R SMD 061365 CAP POLYPROP 0.01UF 63V 2.5% 064444 C158 CAP ELECT 1000UF 25V 066513 C100 CAP POLYPROP .033uF 63V 2.5%...
  • Page 32 PARTS LIST (Cont’d.) AUDIO PCB 751890 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. C216 CAP NPO 1000pF 100V 5% SMD0805 061391 JACK RCA 3X2 WHT/RED 14MM 117790 DIODE ESD SUPPRESSOR SMD 070198 RECEPTACLE XLR FEMALE 117685 DIODE ESD SUPPRESSOR SMD 070198 RECEPTACLE XLR FEMALE...
  • Page 33 PARTS LIST (Cont’d.) AUDIO PCB 751890 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. TRANSISTOR PNP A55 SMD 132334 RES SMD0805 221K 1/8W 1% 145038 TRANSISTOR NPN A05 SMD 132333 RES TF 1K 1% 0.1W SMD0805 145117 TRANSISTOR PNP A55 SMD 132334 RES TF 1K 1% 0.1W SMD0805...
  • Page 34 PARTS LIST (Cont’d.) AUDIO PCB 751890 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R162 RES SMD0805 100K 1/8W 1% 145014 R103 RES SMD0805 4.75K 1/8W 1% 145008 R163 RES SMD0805 100K 1/8W 1% 145014 R104 RES TF 1K 1% 0.1W SMD0805 145117 R164 RES SMD0805 100K 1/8W 1%...
  • Page 35 PARTS LIST (Cont’d.) AUDIO PCB 751890 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R224 RES TF 10K 1% 0.1W SMD0805 145061 IC OP AMP 5534 LOW NOISE SMD 133719 R225 RES TF 10K 1% 0.1W SMD0805 145061 IC OP AMP 5534 LOW NOISE SMD 133719...
  • Page 36 PARTS LIST (Cont’d.) DSPLY/L PSHBTN/R PSHBTN/HDPHN/L MTR/R MTR PCB 751756 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 12.1K 1/8W 1% 145030 TERMINAL PC MOUNT 4-40 118115 RES SMD0805 2.74K 1/8W 1% 145025 IR SENSOR 38KHZ 3V-5V 121066 RES SMD0805 2.74K 1/8W 1% 145025...

  • Page 37: Repacking Instruction

    017937 Plastic foot part(s) are needed, please call or write Customer 400159 #10-32 x 3/4” screw Service Department of McIntosh Laboratory. Refer 404080 #10 Flat washer to page 3. Please see the Part List for the correct part numbers. FOAM PLUG...

  • Page 38: Audio 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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