McIntosh MC152 Service Manual
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McIntosh MC152 Service Manual

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Table of Contents

Performance Specifications .....................................2 - 3
Notes ...........................................................................2
Rear Panel ...................................................................3
Section Location ..........................................................4
Block Diagram .......................................................5 - 6
Interconnection Diagram ........................................7 - 8
Power Supply Schematic and PCB ..........................9 - 14
MC152
POWER AMPLIFIER
SERIAL NO. ADV1001 And Above
CONTENTS
SERVICE MANUAL
Main Schematic and PCB ...................................15 - 24
Heatsink Schematic and PCB ..............................25 - 28
Terminal Schematic and PCB ..............................29 - 32
Display/Meter Light Schematic and PCB .............33 - 36
Parts List .............................................................37 - 42
Repacking Instruction ................................................43
MC152

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Summary of Contents for McIntosh MC152

  • Page 1: Table Of Contents

    MC152 MC152 POWER AMPLIFIER SERIAL NO. ADV1001 And Above CONTENTS Performance Specifications ........2 - 3 Main Schematic and PCB ........15 - 24 Notes ................2 Heatsink Schematic and PCB ......25 - 28 Rear Panel ..............3 Terminal Schematic and PCB ......29 - 32 Section Location ............4...

  • Page 2: Performance Specifications

    2.4 Volts Balanced 240V ~ 50/60Hz at 1.9 Amps 1.2 Volts Unbalanced Standby: less than 0.3 watt Note: Refer to the rear panel of the MC152 for the correct Signal To Noise Ratio (A-Weighted) voltage. 95dB Balanced (118dB below rated output)

  • Page 3: Rear Panel

    MC152 REAR PANEL...

  • Page 4: Section Location

    SECTION LOCATIONS TOP VIEW FROM REAR DISPLAY METER LIGHT HEATSINK MAIN TERMINAL TOP VIEW FROM FRONT POWER SUPPLY...

  • Page 5: Block Diagram

    MC152 POWER AMPLIFIER BLOCK DIAGRAM POSITIVE CURRENT LIMITER VOLTAGE RECTIFIER METER POWER DIFF VOLTAGE LEFT PREDRIVER INDICATOR DRIVER OUTPUT GUARD OUTPUT 8 ohm OUTPUT 4 ohm CURRENT ThermalTrak AUTO- SOURCE DC BIAS FORMER 2 ohm DIFF VOLTAGE PREDRIVER DRIVER OUTPUT...
  • Page 6 INTERCONNECT MAIN FUSE VOLTAGE 100V T6.3AL 250V HEATSINK 110V / 120V T5AL 250V 220V T4AL 250V 230V / 240V T3.15AL 250V TERMINAL METER LT PWR SUPPLY MAIN DISPLAY METER LT TERMINAL CONVERSION JUMPER VOLTAGE JMP1 100V 17198500 110V / 120V 17198600 JMP1 220V...
  • Page 7 MC152 POWER AMPLIFIER 2 POWER SUPPLY 751644 SCH 1 of 2 AC F J1:1 +12V VOUT .1µF 350mA .1µF 220µF 1000µF 1000µF PRIMARY .15µ F AC D ETE C TOR BAC KU P PWR SU PPLY 150k AC DET GN D .1µ...
  • Page 8 2 POWER SUPPLY 751644 SCH 2 of 2 L M ET J12:2 J13:2 L M E T L M ET R M ET R M E T J12:18 J13:18 R M E T L PG LT L P G ON J12:4 J13:4 L P G LT...
  • Page 9 MC152 POWER AMPLIFIER 2 POWER SUPPLY 751644 PCB...
  • Page 10 3 MAIN 751654 SCH 1 of 4 R109 +57VR R111 10µF 3.32k R123 +57V J6:9 +57VR DIFFERENTIAL VOLTAGE -57V J6:6 -57VR R104 R106 47µF R INP DRV + J6:8 R DRV+ R102 1000pF 2.21k R117 R112 R100 2.21M J6:7 R AMP 100pF DRV - J6:5...
  • Page 11 MC152 POWER AMPLIFIER 3 MAIN 751654 SCH 2 of 4 +15V M R +15V M R +15V M R R M E TE R D R IV E R R157 U10:1 +15V +15V M R -15V -5V M R R M E TE R LOG A M P 5.1V...
  • Page 12 3 MAIN 751654 SCH 3 of 4 +57VL 10µF 3.32k +57V J5:9 +57VL DIFFERENTIAL VOLTAGE -57V J5:6 -57VL 47µF L INP DRV + J5:8 L DRV + 2.21k 1000pF 2.21M J5:7 L AMP 100pF DRV - J5:5 L DRV - 2.21M -18V MUT E...
  • Page 13 MC152 POWER AMPLIFIER 3 MAIN 751654 SCH 4 of 4 1.65k 22.1 2.21k 2.21k 2.21k +14V -14V .1µF .1µF +14V +14V U1:1 100pF 10µF +15V R PG M U 47pF 2.21M -14V Vocm +14V 22.1k 100pF -14V U7:2 U7:1 1.65k 22.1...
  • Page 14 3 MAIN 751654 PCB...
  • Page 15 MC152 POWER AMPLIFIER 4 HEATSINK 751655 SCH J4:1 +57V +57V +57V 100pF J4:2 -57V -57V 1.8V D R IVER Q36:2 1µF 1µF 1.2V Q32:1 .1µF OU TP U TS - BIAS ADJUSTMENT - Q34:1 ISO 3 .125 X 1 .010...
  • Page 16 4 HEATSINK 751655 PCB...
  • Page 17 MC152 POWER AMPLIFIER 5 TERMINAL 751656 SCH AUTOFORMER J1:4 J2:2 OUT 8 8Ω J1:2 OUT 4 4Ω .65µH J1:3 J2:1 OUT 2 2Ω Θ J1:1 J2:3...
  • Page 18 5 TERMINAL 751656 PCB...
  • Page 19 MC152 POWER AMPLIFIER DISPLAY/METER LIGHT 751736 SCH METER LT R COLOR ADJUST R M E TE R J3 :1 J6 :3 J6 :1 J8 :10 J8:12 J6 :2 J8 :11 J3 :2 3.92k 3.92k 3.92k L M E TE R...
  • Page 20 DISPLAY/METER LIGHT 751648 PCB...

  • Page 21: Parts List

    MC152 PARTS LIST INTERCONNECT Ref No. Description Part No. Ref No. Description Part No. CAP MONO .1uF 50V ±20% X7R SMD 061365 OUTPUT CONNECTOR MINI 084228 OUTPUT CONNECTOR MINI 084228 CAP MONO .1uF 50V ±20% X7R SMD 061365 OUTPUT CONNECTOR MINI...
  • Page 22 PARTS LIST cont’d. POWER SUPPLY PCB 751644 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. RES SMD0805 47.5K 1/8W 1% 145013 CAP 100pF 200V 5% SMD0805 061390 RES SMD0805 22.1K 1/8W 1% 145012 CAP 100pF 200V 5% SMD0805 061390 RES SMD0805 22.1K 1/8W 1% 145012...
  • Page 23 MC152 PARTS LIST cont’d. MAIN PCB 751654 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. CAP MONO .1uF 50V +/-20% X7R SMD 061365 TRANSISTOR PNP A55 SMD 132334 CAP MONO .1uF 50V +/-20% X7R SMD 061365 TRANSISTOR NPN 2SC3324 SMD 132345 CAP MONO .1uF 50V +/-20% X7R SMD...
  • Page 24 PARTS LIST cont’d. MAIN PCB 751654 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. RES MF 1.65K 1% 1/4W 144516 RES MF 10K 1% 1/4W 144504 RES MF 1.65K 1% 1/4W 144516 RES MF 4.99K 1% 1/4W 144521 RES MF 1.65K 1% 1/4W 144516...
  • Page 25 MC152 PARTS LIST cont’d. MAIN PCB 751654 (Cont’d.) Ref No. Description Part No. Ref No. Description Part No. R152 RES SMD0805 221 1/8W 1% 145001 TRANSISTOR CLIP TO-220 414166 R153 RES SMD0805 1M 1/8W 1% 145042 TRANSISTOR CLIP TO-220 414166...
  • Page 26 PARTS LIST cont’d. DISPLAY/METER LIGHT PCB 751736 Ref No. Description Part No. Ref No. Description Part No. POT 1/4” HORIZ 1K OHM 1/2W SMD 134518 CAP .47UF 50V 20% X7R SMD0805 061373 POT 1/4” HORIZ 1K OHM 1/2W SMD 134518 CAP .47UF 50V 20% X7R SMD0805 061373 POT 1/4”...

  • Page 27: Repacking Instruction

    Cus- 40120400 #10 x2-1/2 cap screw tomer Service Department of McIntosh Laboratory. Refer to 40403300 #10 x 1-3/4 washer page 3. Please see the Part List for the correct part numbers.
  • Page 28 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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