McIntosh MA6600 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
Backup Power Supply Schematic and PCB............9 - 12
Main Schematic and PCB ...................................13 - 24
Volume Schematic and PCB ...............................25 - 32
SERVICE MANUAL
MA6600
INTEGRATED
AMPLIFIER
SERIAL NO. YU1001 And Above
CONTENTS
Tuner Interface Schematic and PCB ....................33 - 34
Display Schematic and PCB................................35 - 40
Pushbutton Schematic and PCB ..........................41 - 42
Headphone Schematic and PCB .........................43 - 44
Capacitor Schematic and PCB ............................45 - 46
Heatsink Schematic and PCB ..............................47 - 50
Meter Light Schematic and PCB ..........................51 - 52
Parts List .............................................................53 - 61
Repacking Instruction ................................................63
MA6600

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Summary of Contents for McIntosh MA6600

  • Page 1: Table Of Contents

    MA6600 MA6600 INTEGRATED AMPLIFIER SERIAL NO. YU1001 And Above CONTENTS Performance Specifications ..........2 Tuner Interface Schematic and PCB ....33 - 34 Notes ................2 Display Schematic and PCB........35 - 40 Rear Panel ..............3 Pushbutton Schematic and PCB ......41 - 42 Section Location ............4 Headphone Schematic and PCB ......43 - 44...
  • Page 2: Performance Specifications

    240 Volts, 50/60Hz at 2.25 amps Signal To Noise Ratio (A-Weighted) Standby: Less than 1 watt High Level, 92dB below rated output Note: Refer to the rear panel of the MA6600 for the correct voltage. Phono, 84dB below 5mV input Power Amplifier, 115 below rated output Overall Dimensions Width is 17-1/2 inches (44.45cm)
  • Page 3: Rear Panel

    MA6600 REAR PANEL * Shown with optional TM2 Tuner Module.
  • Page 4: Section Location

    SECTION LOCATIONS...
  • Page 5: Block Diagram

    MA6600 BLOCK DIAGRAM...
  • Page 6 INTERCONNECT...
  • Page 7: Backup Power Supply

    MA6600 BACKUP POWER SUPPLY 750743 SCH AC FUSE +VBU McIntosh AC N 1000uF +VBU J18:5 +VBU J20:1 MA6600 P1330 PRIMARY Back Power Supply PCB Assy J18:3 J20:3 PC BD 129857 129857 Insertion Assy 702467 702467 POWER CHASSIS J18:1 J20:5 PCB Assy...
  • Page 8 BACKUP POWER SUPPLY 750743 PCB...
  • Page 9 MA6600 MAIN 750738 SCH 1 of 5 .01uF .033uF J1:1 10uF 7.5k.5% 89.8k.5% PHONO J1:2 J3:5 10uF -15VPH L_AMP LEFT PHONO AMP 10uF SG15 PHONO_L PHONO_L 47.5 PHONO_RLY R1:2 POWER AMP IN J3:6 R_AMP 15VPH 15VPH 2.21 SG16 R1:1 GP1:1...
  • Page 10 MAIN 750738 SCH 2 of 5 J5:1 J2:18 J5:2 J2:17 INPUT RELAY THERM DECODER J5:3 J2:16 J5:4 J2:15 J5:5 J2:14 R199 22.1k S_DATA J5:6 J2:13 SDATA DATA SDATA SCLK SCLK J5:7 22.1k J2:12 RESET R200 SCLK PHONO_RLY J5:8 LCLK SCLK J2:11 CD1_RLY 100pF...
  • Page 11 MA6600 MAIN 750738 SCH 3 of 5 L B+ L B+ L B+ +14L -15V -14L L DRV FB J18:5 J1:5 VOLTAGE .0068uF -14L +65V 47 .5 W J1:7 L B+ DIFFERENTIAL J18:7 10uF 3.32k U16:1 L_AMP 47 .5 W...
  • Page 12 MAIN 750738 SCH 4 of 5 R B+ R B+ R B+ +14R R147 -15V -14R R148 R DRV FB J100:5 J1:5 VOLTAGE .0068uF R134 -14R +65V 47 .5 W J1:7 R B+ R146 DIFFERENTIAL J100:7 10uF 3.32k U18:1 R_AMP R135 C100 47 .5W...
  • Page 13 R185 IN OUT 1.1A R186 IN OUT -15V 1.1A R187 3.0A R188 12V_T TUNER_EN McIntosh 3.0A GP1:2 GP1:3 MA6600 P1330 MAIN PCB Assy HS21 PC BD 129915 +VBU Insertion Assy 702462 +VBU J20:1 PCB Assy 750738 J18:5 IN OUT 5V_DISP...
  • Page 14 MAIN 750738 PCB 129925 Rev. A R131 RoHS C106 R186 R185 R187 R188 R178 R174 R124 R179 C103 C110 C115 C216 C108 C105 R190 R129 R125 R175 R181 C126 R189 C220 HS22 U121 C113 C109 C112 C117 C121 R126 R176 FN13 R127 R177...
  • Page 15: Balanced Input

    MA6600 VOLUME 750739 SCH 1 of 3 BALANCED INPUT -15V 10uF U10:1 CD1_L LEFT 10uF 100pF 10uF CD1_R RIGHT 10uF U10:2 100pF -15V...
  • Page 16: Tone Control

    VOLUME 750739 SCH 2 of 3 TONE CONTROL PREAMP_L TONE_L 10uF 10uF PREAMP_R TONE_R 10uF 10uF 10uF .1uF IN OUT .1uF IN OUT -15V 10uF...
  • Page 17: Volume Control

    MA6600 VOLUME 750739 SCH 3 of 3 TO MAIN TO MAIN VOLUME CONTROL -15V -15V U5:1 10uF LEFT VOLUME CONTROL 47uF BUFFER L_OUT -15V 10uF U3:1 LEFT LISAUDIO_L 100uF 100uF 220uF LEFT POST ATTENUATOR 1.1k -15V -3dB -9dB -12dB -6dB...
  • Page 18 VOLUME 750739 PCB...
  • Page 19 MA6600 TUNER INTERFACE 750741 SCH and PCB TUN_R J1:1 J2:1 J5:18 TUN_R J1:2 DGND J2:2 J5:17 OUT_GND J1:3 J2:3 J1:4 J5:16 J1:5 TUN_L J2:4 J5:15 TUN_L J1:6 J2:5 J5:14 J1:7 J1:8 J2:6 J5:13 J1:9 DGND J2:7 J5:12 3.3V J1:10 J2:8...
  • Page 20 DISPLAY 750742 SCH 1 OF 2 5V_BU J11:18 DISP_GND J81:1 MICROPROCESSOR DISP_GND RESET EEPROM 5V_BU J11:16 DISP_GND 475k J81:3 OUT VCC TONECS J11:15 5V_BU TONECS J81:4 STDBY_IC J10:1 J80:18 5V_LED U3:4 5V_BU SCLK J11:14 DISP_GND MANUAL RESET J81:5 5V_DISP J10:2 SDATA J80:17 U3:3...
  • Page 21 MA6600 DISPLAY 750742 SCH 2 OF 2 (Double Row) (Single Row) 2x20 DISPLAY J5:1 5V_LED J1:12 J5:2 J1:11 J5:11 DS10 J1:2 LEFT INTENSITY J5:12 J1:1 J5:4 L GRN J1:9 J5:5 L GRN FRONT PANEL J1:8 POWER GUARD ILLUMINATION J5:6 LEFT COLOR...
  • Page 22 DISPLAY 750742 PCB...
  • Page 23: Push Button

    MA6600 PUSHBUTTON 750744 SCH and PCB COL 0 COL 1 COL 2 COL 3 STANDBY/ON OUTPUT2 OUTPUT1 MUTE RESET SELECT UP SELECT DN ROW 0 J1:4 J1:1 J2:18 J2:15 BYPASS MONO STORE STORE J1:6 J1:2 J2:17 J2:13 ROW 1 STORE...
  • Page 24 HEADPHONE 750779 SCH and PCB L_HDPH J2:1 J2:4 AGND J2:2 HEADPHONE J2:3 AGND J2:3 J2:2 R_HDPH J2:4 J2:1...
  • Page 25 MA6600 CAPACITOR 750740 SCH and PCB + 65V RED + J5:2 J4:1 GRN - J5:1 - 65V J4:2 J6:2 + 65V J4:1 J6:1 - 65V J4:2...
  • Page 26 HEATSINK 750745/750698 SCH THERMAL J1:3 SENSOR J18/J100:3 470 RT1 J1:4 J18/J100:4 +67V J1:7 +65V J4:1 +67V J18/J100:7 J5/J6:2 + DRIVE J1:6 DRIVE+ J18/J100:6 (+) DRIVER (+) OUTPUTS Q14:1 (+) CURRENT LIMITER Q4:1 Q12:1 Q10:1 BIAS+ BIAS (+) J5:1 Q10:2 Q12:2 Q14:2 .47x 2 .47x 2...
  • Page 27 MA6600 HEATSINK 750745 PCB 750698 HEATSINK...
  • Page 28 METER LIGHT 750845 SCH and PCB J1:12 J5/J7:1 J1:11 J5/J7:2 J1:10 J5/J7:3 J1:9 J5/J7:4 J1:8 J5/J7:5 J1:7 J5/J7:6 J1:6 J5/J7:7 J1:5 J5/J7:8 J1:4 J5/J7:9 J1:3 J5/J7:10 +5.6V J1:2 J5/J7:11 +5.6V J1:1 J5/J7:12...
  • Page 29: Parts List

    CAP ELECT 10UF 16V 4X5 CASE T&R 066580 CONN AC LINE INPUT IEC FASTON 117886 CAP ELECT 10UF 16V 4X5 CASE T&R 066580 METER MA6600 124108 CAP ELECT 10UF 16V 4X5 CASE T&R 066580 METER MA6600 124108 CAP ELECT 10UF 16V 4X5 CASE T&R...
  • Page 30 PARTS LIST (Cont’d.) MAIN PCB 750738 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. C106 CAP ELECT 220UF 25V 066507 CAP MONO 220PF 200V 10% NPO 061342 C107 CAP MPF 0.1UF 5% 63VDC 064325 CAP MONO 220PF 200V 10% NPO 061342 C108 CAP MPF 0.47UF 5% 100VDC...
  • Page 31 MA6600 PARTS LIST (Cont’d.) MAIN PCB 750738 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. DIODE RECTIFIER 070175 RELAY REED SPST-NO 5V 1.2A 087078 DIODE RECTIFIER 070175 RELAY REED SPST-NO 5V 1.2A 087078 DIODE RECTIFIER 070175 RELAY REED SPST-NO 5V 1.2A...
  • Page 32 PARTS LIST (Cont’d.) MAIN PCB 750738 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. TRANSISTOR PNP SILICON 132304 RES MF 2.21K 1% 1/4W 144584 RES MF 8.25K 1% 1/4W 144549 TRANSISTOR NPN SILICON 132317 RES MF 8.25K 1% 1/4W 144549 TRANSISTOR NPN 300V 2SC4449 132342...
  • Page 33 MA6600 PARTS LIST (Cont’d.) MAIN PCB 750738 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R167 RES MF 3.32K 1% 1/4W 144518 R108 RES MF 267K 1% 1/4W 144532 R168 RES MF 221 OHM 1% 1/4W 144559 R109 RES MF 47.5K 1% 1/4W...
  • Page 34 PARTS LIST (Cont’d.) VOLUME PCB 750739 Ref. No. Description Part No. Ref. No. Description Part No. CAP MONO .1UF 50V 20% Z5U 061346 CAP MPF 0.22UF 5% 63VDC 064329 CAP MONO .1UF 50V 20% Z5U 061346 CAP ELECT 100UF 25V 066573 CAP MONO .1UF 50V 20% Z5U 061346...
  • Page 35 MA6600 PARTS LIST (Cont’d.) VOLUME PCB 750739 (Cont’d.) VOLUME PCB 750739 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES MF 100K 1% 1/4W 144528 RES MF 1K 1% 1/4W 144513 RES MF 100K 1% 1/4W 144528...
  • Page 36 TERMINAL STRIP 14 PIN .025 SQ 117647 IC NOR 2 INPUT X 4 133592 (DS10) SCR TS 2-32 X 1/4 PH PN TYPE B 401161 IC PROGRAMMED VER 2.14 MA6600 133748 CONN 18 PIN FFC 117908 (U4) SOCKET IC 40-PIN 178133...
  • Page 37 MA6600 PARTS LIST (Cont’d.) HEATSINK PCB 750745 (Cont’d.) CAPACITOR PCB 750740 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES MF 1K 1% 1/4W 144513 CONN HEADER 2 PIN 0.156 117404 RES MF 1K 1% 1/4W 144513...
  • Page 38 NOTES...
  • Page 39: Repacking Instruction

    If a shipping carton or any of the interior part(s) are needed, please call or write Customer 017937 Plastic foot Service Department of McIntosh Laboratory. Refer 400159 #10-32 x 3/4 machine screw to page 3. Please see the Part List for the correct...
  • Page 40: Integrated Amplifier

    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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