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McIntosh MA6300 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
Main Schematic and PCB ..................................... 9 - 16
INTEGRATED AMPLIFIER
SERIAL NO. WR1001 And Above
CONTENTS
SERVICE MANUAL
Preamp Schematic and PCB ............................... 17 - 20
Heatsink Schematic and PCB ............................ 21 - 28
Display Schematic and PCB .............................. 29 - 32
Push Button Schematic and PCB ....................... 33 - 34
Meter Schematic and PCB ................................. 35 - 36
Parts List ............................................................ 37 - 42
Repacking Instruction .............................................. 43

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Summary of Contents for McIntosh MA6300

  • Page 1: Table Of Contents

    INTEGRATED AMPLIFIER SERIAL NO. WR1001 And Above CONTENTS Performance Specifications ........2 Preamp Schematic and PCB ....... 17 - 20 Notes ................. 3 Heatsink Schematic and PCB ......21 - 28 Rear Panel ..............4 Display Schematic and PCB ......29 - 32 Section Location ............
  • Page 2: Performance Specifications

    (for rated output) 240 Volts, 50/60Hz at 1.8 amps High Level, 250mV unbalanced, 500mV balanced Phono, 2.5mV Note: Refer to the rear panel of the MA6300 for the Power Amp In, 1V correct voltage. Signal To Noise Ratio Overall Dimensions...
  • Page 3: Notes

    MA6300 NOTES...
  • Page 4: Rear Panel

    MA6300 REAR PANEL SECTION LOCATIONS TOP VIEW WITH COVER REMOVED...
  • Page 5: Block Diagram

    MA6300 INTEGRATED AMPLIFIER BLOCK DIAGRAM...
  • Page 6 INTERCONNECT...
  • Page 7 MA6300 INTEGRATED AMPLIFIER 2 MAIN 050276 SCH 1 OF 3...
  • Page 8 2 MAIN 050276 SCH 2 OF 3...
  • Page 9 MA6300 INTEGRATED AMPLIFIER 2 MAIN 050276 SCH 3 OF 3...
  • Page 10 2 MAIN 050276 PCB...
  • Page 11 MA6300 INTEGRATED AMPLIFIER 3 PREAMP 050279 SCH...
  • Page 12 3 PREAMP 050279 PCB...
  • Page 13 MA6300 INTEGRATED AMPLIFIER 4 HEATSINK 050280 SCH 1 OF 3...
  • Page 14 4 HEATSINK 050280 SCH 2 OF 3...
  • Page 15 MA6300 INTEGRATED AMPLIFIER 4 HEATSINK 050280 SCH 3 OF 3...
  • Page 16 4 HEATSINK 050280 PCB...
  • Page 17 MA6300 INTEGRATED AMPLIFIER 5 DISPLAY 050277 SCH 1 of 2...
  • Page 18 5 DISPLAY 050277 SCH 2 of 2 and PCB...
  • Page 19 MA6300 INTEGRATED AMPLIFIER 6 PUSH BUTTON 050278 SCH and PCB...
  • Page 20 7 METER 050351 SCH and PCB...
  • Page 21: Parts List

    MA6300 PARTS LIST MAIN PCB 050276 Ref No. Description Part No. Ref No. Description Part No. CAP POLYPROP 0.15UF 10% 250VDC 064363 CAP MONO 100PF 100V 10% NPO 061341 CAP MPF 0.1UF 5% 63VDC 064325 CAP MONO 47PF 200V 10% NPO 061340 CAP MONO .1UF 50V 20% Z5U...
  • Page 22: Parts List

    133610 RES MF 2.21 OHM 1% 1/4W 144607 IC NAND 2 INPUT X 4 133575 RES MF 1K 1% 1/4W 144513 IC PROGRAMMED V1.00 MA6300 133563 RES MF 100K 1% 1/4W 144528 (U5) SOCKET IC 40-PIN 178133 RES MF 3.32K 1% 1/4W...
  • Page 23 MA6300 PARTS LIST cont’d. PREAMP PCB 050279 Ref No. Description Part No. Ref No. Description Part No. CAP ELECT 220UF 25V 066507 RES MF 33.2K 1% 1/4W 144694 CAP ELECT 47UF 25V 20% BP 066556 RES MF 33.2K 1% 1/4W 144694 CAP MPF 0.22UF 5% 63VDC...
  • Page 24 PARTS LIST cont’d. HEATSINK PCB 050280 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. DIODE SILICON 070174 TRANSISTOR PNP 120V 132255 DIODE SILICON 070174 TRANSISTOR NPN 2K/REEL 132317 DIODE SILICON 070174 TRANSISTOR PNP 132304 DIODE SILICON 070174 TRANSISTOR PNP 132321 DIODE SILICON...
  • Page 25 MA6300 PARTS LIST cont’d. HEATSINK PCB 050280 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. RES WW DUAL .47 OHM 5% 5W 139199 CAP ELECT 10UF 50V 066445 RES WW DUAL .47 OHM 5% 5W 139199 CAP ELECT 10UF 50V...
  • Page 26 MA6300 PARTS LIST cont’d. DISPLAY PCB 050277 (Cont’d.) PUSHBUTTON PCB 050278 Ref No. Description Part No. Ref No. Description Part No. LED SQUARE RED 058109 RES MF 324 OHM 1% 1/4W 144597 (DS1) LED SPACER .220 LENGTH 163001 RES MF 324 OHM 1% 1/4W...
  • Page 27: Repacking Instruction

    MA6300 REPACKING INSTRUCTION...
  • Page 28 SERIAL NO. WR1001 And Above 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.