McIntosh MC402 Service Manual

McIntosh MC402 Service Manual

Power amplifier
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Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 4
Block Diagram ...................................................... 5 - 6
Interconnection Diagram ...................................... 7 - 8
Heatsink Schematic and PCB ............................. 9 - 12
Driver Schematic and PCB ................................ 13 - 16
POWER AMPLIFIER
CONTENTS
SERVICE MANUAL
Input Schematic and PCB .................................. 17 - 18
Capacitor Schematic and PCB ........................... 19 - 20
Meter ................................................................ 21 - 25
Indicator Schematic and PCB ................................... 26
Meter LED Schematic and PCB .......................... 27 - 28
Parts List ............................................................ 27 - 30
Exploded View and Parts List ............................. 31 - 36
Repacking Instructions ............................................. 37

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Summary of Contents for McIntosh MC402

  • Page 1: Table Of Contents

    POWER AMPLIFIER CONTENTS Performance Specifications ........2 Input Schematic and PCB ........17 - 18 Notes ................. 2 Capacitor Schematic and PCB ......19 - 20 Rear Panel ..............3 Meter ..............21 - 25 Section Location ............4 Indicator Schematic and PCB ........26 Block Diagram ............
  • Page 2: Performance Specifications

    Maximum Total Harmonic Distortion at any power level 240 Volts, 50/60Hz at 5 amps from 250 milliwatts to rated power output is 0.005% Note: Refer to the rear panel of the MC402 for the correct Intermodulation Distortion voltage. Maximum Intermodulation Distortion if instantaneous peak...
  • Page 3: Rear Panel

    MC402 REAR PANEL...
  • Page 4: Section Location

    SECTION LOCATIONS TOP VIEW WITH COVER REMOVED BOTTOM VIEW WITH COVER REMOVED...
  • Page 5: Block Diagram

    MC402 BLOCK DIAGRAM...
  • Page 6 INTERCONNECT...
  • Page 7 MC402 HEATSINK 2B 2C 2D 049826...
  • Page 8 HEATSINK 2A 2B 2C 2D 049826...
  • Page 9 MC402 DRIVER 049219...
  • Page 10 DRIVER 049219...
  • Page 11 MC402 INPUT 049222...
  • Page 12 CAPACITOR 049216...
  • Page 13: Meter

    MC402 METER 049798...
  • Page 14 METER 049798...
  • Page 15 MC402 METER INDICATOR 049798 049799...
  • Page 16: Parts List

    METER LED 049809 PARTS LIST R1 R8 RES CF 220 OHM 5% 1/4W 14103300 R2 R9 RES MET OX 680 OHM 5% .5W 13709300 Ref. No. Description Part No. R3 R10 RES CF 15K 5% 1/4W 14107600 INTERCONNECT R6 R11 RES MET OX 1.8K 5% .5W 13709400 BP1 BP3 BP5 BP7 BP9 BP11...
  • Page 17 MC402 PARTS LIST con’t C15 C16 C28 CAP MPF 0.22UF 5% 63VDC 06432900 CAP ELECT 1UF 50V 06651000 Q31 Q36 Q67 Q70 Q78 Q80 TRANSISTOR NPN MPS4124 13222300 CAP ELECT 22UF 100V 06650600 Q34 Q35 Q37 Q38 Q39 Q59 Q66...
  • Page 18 EXPLODED VIEW...
  • Page 19 MC402 EXPLODED VIEW con’t...
  • Page 20: Exploded View And Parts List

    EXPLODED VIEW con’t and PARTS LIST 101172 SCREW TC 6-32 X 1/4 PH FL U/C 049817 POTTED TRANSFORMER OUTPUT 049818 POTTED TRANSFORMER POWER 126895 DECAL OUTPUT TRANSFORMER 126896 DECAL POWER TRANSFORMER 078025 GROMMET 3/4” 018614 HEATSINK 084156 ISOSTRATE POWER SUPPLY 112087 SPACER PCB 1/4”...
  • Page 21: Repacking Instructions

    MC402 REPACKING INSTRUCTIONS...
  • Page 22 SERVICE MANUAL 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.

Table of Contents