McIntosh MC1502 Service Manual
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MC1502
OF
N
POWER AMPLIFIER
ALL SERIAL NUMBERS
OFF
ON
MC1502
SERVICE MANUAL
CONTENTS
Performance Specifications, Notes and Rear Panel ��������������� 2
Section Locations, Bottom View������������������������������������������������ 3
Block Diagram ������������������������������������������������������������������������������� 4
Interconnect Schematic and Parts List ������������������������������������� 5
Main Schematic PCB and Parts List ��������������������������������������6-13
Control/Tube Light Schematic PCB and Parts List ����������14-16
Input Schematic PCB and Parts List ����������������������������������� 17-18
Terminal Schematic PCB and Parts List ���������������������������������� 19
Repacking Instruction ���������������������������������������������������������������� 20
Notes ��������������������������������������������������������������������������������������������� 21
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Summary of Contents for McIntosh MC1502

  • Page 1: Table Of Contents

    MC1502 MC1502 POWER AMPLIFIER ALL SERIAL NUMBERS SERVICE MANUAL CONTENTS Performance Specifications, Notes and Rear Panel ��������������� 2 Section Locations, Bottom View������������������������������������������������ 3 Block Diagram ������������������������������������������������������������������������������� 4 Interconnect Schematic and Parts List ������������������������������������� 5 Main Schematic PCB and Parts List ��������������������������������������6-13 Control/Tube Light Schematic PCB and Parts List ����������14-16...
  • Page 2: Performance Specifications, Notes And Rear Panel

    +0, -0.5dB from 20Hz to 20,000Hz 240V ~ 50/60Hz at 2.75 Amps +0, -3.0dB from 10Hz to 70,000Hz Standby: Less than 0.3 watts Note: Refer to the right side panel of the MC1502 Input Sensitivity (for rated output) for the correct voltage. 1.7 Volts Unbalanced...
  • Page 3: Section Locations, Bottom View

    MC1502 SECTION LOCATIONS Bottom View INPUT PCB TERMINAL MAIN TUBE LIGHT CONTROL...
  • Page 4: Block Diagram

    MC1502 BLOCK DIAGRAM BACKUP BACKUP AC POWER MAIN FUSE POWER POWER TRANSFORMER SUPPLY MAIN INRUSH MAIN -250V POWER CURRENT POWER RECTIFIERS -250V RELAY LIMITER TRANSFORMER AND FILTERS 12.6VAC L HIGH VOLTAGE POWER POWER HEATER +700V 6.3VAC RECTIFIERS +700V CONTROL CONTROL...
  • Page 5: Interconnect Schematic And Parts List

    MC1502 INTERCONNECT INTERCONNECT PARTS LIST Ref. No. Description Part No. MCINTOSH BINDING POST 084226 MCINTOSH BINDING POST 084226 MCINTOSH BINDING POST 084226 MCINTOSH BINDING POST 084226 MCINTOSH BINDING POST 084226 MCINTOSH BINDING POST 084226 MCINTOSH BINDING POST 084226 MCINTOSH BINDING POST...
  • Page 6: Main Schematic Pcb And Parts List

    MC1502 MAIN 752669 SCH 1 of 5 R PLT + 12.6VAC R KT 88 V7R:1 MAIN RIGHT OUTPUT 6.3VAC 220 5W R167 R OUTPUT T RANSFO RMER 1.8k R155 KT 88 V5R:1 VI O J29:1 R GRD + 220 5W 1.8k...
  • Page 7 MC1502 MAIN 752669 SCH 2 of 5 L PLT + 12.6VAC L V7L:2 KT88 R148 220 5W Main - L - Output 6.3VAC V8L:2 V7L:1 KT88 KT88 L OUTPUT TRANSFORMER R136 1.8k R146 220 5W R144 VI O J27:1 1.8k...
  • Page 8 MC1502 MAIN 752669 SCH 3 of 5 R119 200V +700V L PLT + 100µF +350VL 1µF L C OM J24:4 200V L C OM R127 100k .047µF 100k V4 L:1 12AT 7 2.21k 47pF R100 L U N B J24:5...
  • Page 9 MC1502 MAIN 752669 SCH 4 of 5 J1 :1 +12V VOUT J1 :4 350mA J1 :7 PRIMARY TRANSFORMER THERMAL J1 :10 PROTECT ION Main - Power Supply +700V J2 :1 +12.6V J2 :4 +500V J2 :7 R ED J2 :10...
  • Page 10 MC1502 MAIN 752669 SCH 5 of 5 +12.6V +12.6V +12.6V 47.5k PC OUT PU T & BI AS D ELAY 2.21k 20.0k 2.21M L SM PC OUT PU T BIAS D R IVER SEN T R Y J23:1 PC OUT...
  • Page 11 MC1502 MAIN 752669 PCB 130607 Rev A RoHS...
  • Page 12 MC1502 MAIN 752669 PARTS LIST Ref. No. Description Part No. Ref. No. Description Part No. Ref. No. Description Part No. Ref. No. Description Part No. CAP ELECT 1000UF 25V 066513 CAP POLY .047UF 10% 1000VDC 064434 DIODE ZENER 200V 1.5W...
  • Page 13 MC1502 MAIN 752669 PARTS LIST (Continued) Ref. No. Description Part No. Ref. No. Description Part No. Ref. No. Description Part No. Ref. No. Description Part No. RES TF 20.0K 0.1% 0.1W SMD0805 145072 RES TF 47.5K 1% .125W SMD0805 145132...
  • Page 14: Control/Tube Light Schematic Pcb And Parts List

    MC1502 CONTROL / TUBE LIGHT 752524 SCH 1 of 2 L RED J3:12 L R ED J3:7 R RED R R ED ORN 1 J3:18 ORN 1 J3:16 ORN 2 ORN 2 ORN 3 J3:3 ORN 3 2.21M ORN 4...
  • Page 15 MC1502 CONTROL / TUBE LIGHT 752524 SCH 2 of 2 12AX7A 12AX7A 12AT7 12AT7 12AT7 12AT7 12AX7A 12AX7A McIntosh McIntosh McIntosh McIntosh McIntosh McIntosh McIntosh M cI nt osh U SA DS1:1 DS1:2 DS2:1 DS2:2 DS3:1 DS3:2 DS4:1 DS4:2 DS5:1...
  • Page 16 MC1502 CONTROL / TUBE LIGHT 752524 PCB CONTROL / TUBE LIGHT 752524 PARTS LIST Ref. No. Description Part No. Ref. No. Description Part No. Ref. No. Description Part No. Ref. No. Description Part No. CAP .47UF 50V 20% X7R SMD0805...
  • Page 17: Input Schematic Pcb And Parts List

    MC1502 INPUT 752525 SCH 4.7µF L BAL+ L BAL- L BAL 4.7µF 4-40 AGND AGND AGND AGND AGND INPUT J3:2 1µF L UNB AGND L UNBAL J1:6 L BAL + L COM L BAL - J1:5 RCA COM L UNB...
  • Page 18 MC1502 INPUT INPUT 752525 PCB 752525 PARTS LIST Ref. No. Description Part No. CAP ELECT 4.7UF 50V SMD 066601 CAP ELECT 4.7UF 50V SMD 066601 CAP ELECT 1UF 50V SMD 066600 CAP 1000PF PPS 50V 2% SMD0805 061408 CAP 1000PF PPS 50V 2% SMD0805 061408 CAP ELECT 4.7UF 50V SMD...
  • Page 19: Terminal Schematic Pcb And Parts List

    MC1502 TERMINAL TERMINAL 752526 SCH 752526 PARTS LIST Ref. No. Description Part No. CAP POLYPROP 0.15UF 10% 275VDC 064464 CAP POLYPROP 0.15UF 10% 275VDC 064464 J1:1 L 8Ω HEADER 4 CIRCUIT POST 117772 HEADER 4 CIRCUIT POST 117772 CHOKE 0.65UH OUTPUT 122297 CHOKE 0.65UH OUTPUT...
  • Page 20: Repacking Instruction

    Manual If a shipping carton or any of the interior part(s) are Foam Ring needed, please call or write Customer Service Department of McIntosh Laboratory. Please see the Part List for the correct part numbers. Quantity Part Number Description 034649...
  • Page 21: Notes

    MC1502 NOTES...
  • Page 22 The continuous improvement of its products is the policy M C 15 0 2 of McIntosh Laboratory Incorporated, who reserve the P O W E R A M P L I F I E R right to improve design without notice. Because of the McINTOSH LABORATORY, INC., BINGHAMTON, NY...

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