McIntosh MI128 Service Manual
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McIntosh MI128 Service Manual

8 channel power amplifier
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Table of Contents

THIS SPACE INTENTIONALLY LEFT BLANK
MI128
8 CHANNEL
POWER AMPLIFIER
SERIAL NO. AGZ1001 And Above
CONTENTS
Performance Specifications . . . . . . . . . . . . . 2
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Section Location . . . . . . . . . . . . . . . . . . . . . 4
Interconnection Diagram . . . . . . . . . . . . . . . 5
Main Schematic and PCB . . . . . . . . . . . 6 - 19
Input Schematic and PCB . . . . . . . . . . 20 - 23
SERVICE MANUAL
Power Source Schematic and PCB . . . . 24 - 27
UCD Interface Schematic and PCB . . . . . . . . . 28 - 31
Front Panel Schematic and PCB . . . . . . 32 - 37
Amp Module PCB . . . . . . . . . . . . . . . . . . . . . 38
Parts List . . . . . . . . . . . . . . . . . . . . . . . 40 - 53
Repacking Instructions . . . . . . . . . . . . . . . . 54

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Summary of Contents for McIntosh MI128

  • Page 1: Table Of Contents

    MI128 8 CHANNEL POWER AMPLIFIER SERIAL NO. AGZ1001 And Above CONTENTS Performance Specifications ... . . 2 Power Source Schematic and PCB ..24 - 27 UCD Interface Schematic and PCB ..28 - 31 Rear Panel .

  • Page 2: Performance Specifications

    Greater than 32, at 4 ohms Minimum sine wave continuous average power DIG 1 MI 128 8 CHANNEL POWER AMPLIFIER McINTOSH LABORA TORY, INC., BINGHAMT ON, NY HANDCRAFTED IN USA WITH US AND IMPORTED PARTS BUS 1 output per channel, all channels operating is:...

  • Page 3: Section Location

    SECTION LOCATIONS INTERCONNECT Top View INPUT ---- MAIN UCD INTERFACE MODULE FRONT...
  • Page 4 MAIN 320665 SCH 1 of 6 MAIN MAIN MAIN MAIN MI128 MAIN_DAC Vm1.0.SCH MI128 MAIN_MCU Vm1.0.SCH MI128 MAIN_POWER Vm1.0.SCH MI128 MAIN_OUTPUT Vm1.0.SCH SCL_1 SCL_1 SDA_1 SDA_1 MUTE_DI MUTE_DI SCL_2 SCL_2 MUTE_CLK MUTE_CLK SDA_2 SDA_2 MUTE_CS MUTE_CS 8416_RST_1 8416_RST_1 OP_8- OP_8-...
  • Page 5 MAIN 320665 SCH 2 of 6 R3010 R3022 R3006 R3018 R3002 COM_8 R3014 COM_3 AGND R3007 AGND R3019 R3072 R3074 C3056 100P RL300A C3058 100P RL302B C3005 NC AGND +15V AGND +15V C3000 NC R3199 R3201 U300A C3002 NC C3080 C3128 U306B C3007 NC...
  • Page 6 MAIN 320665 SCH 3 of 6 C2016 C2026 R2022 R2024 R2026 R2033 DA_1LN 499R 499R 100U/10V 22uF/25V R2034 C2021 C2018 +12VD 560pF U2002A R2028 330N NE5532 Q2000 R2015 499R D2002 R2020 +15V Q2001 Q2002 AGND 2SC3326 C2028 R2032 1SS352 100nF R2016 1K96 C2019...
  • Page 7 MAIN 320665 SCH 4 of 6 Q2320 Q2322 R2368 R2370 BC856 BC856 J2200 R2322 R2328 AGND R2320 R2352 100K R2324 R2354 100K D2321 D2323 100K 100K AGND BAV99 BAV99 D2220 D2228 5VD_EN AGND +43V_1 CLIP_8 AGND +43V_1 CLIP_7 TO MAIN_POWER 5VD_EN CLIP_8 CLIP_7...
  • Page 8 MAIN 320665 SCH 5 of 6 Chassis J2500 Chassis J2502 C2526 C2529 C2534 C2537 2.2nF/100V 2.2nF/100V RL2500A 2.2nF/100V 2.2nF/100V RL2502A OP_8+ L2500B OP_8+ OP_4+ L2501B OP_4+ 8 SPK OUT C2516 C2524 C2572 C2532 4 SPK OUT C2518 C2574 2.2nF/100V OP_8- 2.2nF/100V OP_8- OP_4-...
  • Page 9 MAIN 320665 SCH 6 of 6 3V3S Q2400 DTA114 J2400 STANDBY STANDBY AGND STBa R2400 Q2401 100R DTC114EKA H2401 R2401 CON5 5C/W or bigger AGND +18V +18V +15V U2401 C2402 AGND LM317M C2400 100N J2401 470U/35V 200R R2406 AGND AGND C2403 C2419 100N...
  • Page 10 MAIN 320665 PCB...
  • Page 11 INPUT 320666 SCH AGND R1016 RCA100 C1004 LOCAL/BUS LOCAL 8 LOC_8 +15V MONO/ST U100A C1020 100U/25V AGND AGND R1026 R1012 C1028 R1004 LO_8 S100 C1012 22uF/25V 100nF C1000 U104A U104B S102 100P 220pF AGND NE5532 NE5532 C1016 C1024 NE5532 AGND R1022 100nF LO_7...
  • Page 12 INPUT 320666 PCB R1101 R1097 R1103 C1104 R1098 3V3D R1104 R1099 R1106 DET3 DET2 C1100 XM102 C1106 INPUT XM105 C1101 R1074 DET1 R1070 C1107 D114 C1109 +15V C1102 R1102 D113 -15V AGND 3V3S AGND 3V3S XM100 3V3S R1064 C1064 IP4R R1061 SENS AGND...
  • Page 13 320668 SCH AC1-L AC2-N P902 HF165FD12-HY1STF DC12V R930 AC1-L VDC+ 100k K900 R933 R941 Relay-SPST 100k R949 Q908 C928 C930 C932 R974 BC856BW 390K R900 R903 200V/1000UF 200V/1000UF 200V/1000UF 330K 1206 330k 330k C907 D910 D902 R921 R934 C902 100nF/50V LL4148 BAS316 BR901...
  • Page 14 320668 PCB CY904 VM1.0-PSU BR901 Q928 Q931 Q929 Q930 U9033 U903 Q918 Q919 C918 0935 K902 K900 K901 C938 C9388 CY903 TR900 NTC900 T900 C958 C957 L90201 C926 J901 J908 +40V IC901 C974 C970 C972 C973 C971 C969 -40V T902 P901 F901 C928...
  • Page 15 UCD INTERFACE 320664 SCH +43V_1 UcD_CS +43V_2 R4500 UcD_DI 0.025R J411 R4504 AMP MODULE 1 UcD_CLK 0.025R OP_8+ AGND +43V_AMP_8 3V3D VCL8+ OVER_TEMP1 OVER_TEMP1 VCL8- +43V_AMP_2 OVER_TEMP2 AGND OVER_TEMP2 R4071 AGND IP8H- OP_8+ IP8H+ IP8H+ OP_8- 3K92 J408 OVER_TEMP3 COM_8 C4032 NC 100N AGND...
  • Page 16 UCD INTERFACE 320664 PCB R4627 R4623 R4624 R4621 R4626 R4625 R4622 R4620 R4282 R4278 R4281 R4285 R4280 R4284 R4279 R4286 R4615 C4140 C4577 R4618 R4635 R4538 R4536 J448 J426 J408 J439 J438 J409 J424 J425 C4544 C4552 S401 C4550 C4542 TP4520 R4629 R4523...
  • Page 17 FRONT PANEL 320667 1 of 2 SCH 5VD_C 5VD_C 5VD_C 5VD_C 5VD_C R559 R563 R565 R557 R561 R558 R560 R562 R564 R556 CLIP_7 CLIP_6 CLIP_5 CLIP_4 CLIP_8 Q500 Q501 Q502 Q503 Q504 CLIP_8 CLIP_7 CLIP_6 CLIP_5 CLIP_4 2SA1015 2SA1015 2SA1015 2SA1015 2SA1015 C500...
  • Page 18 FRONT PANEL 320667 2 of 2 SCH 5VD_C 5VD_C 5VD_C 5VD_C 5VD_C R559 R563 R565 R557 R561 R558 R560 R562 R564 R556 CLIP_7 CLIP_6 CLIP_5 CLIP_4 CLIP_8 Q500 Q501 Q502 Q503 Q504 CLIP_8 CLIP_7 CLIP_6 CLIP_5 CLIP_4 2SA1015 2SA1015 2SA1015 2SA1015 2SA1015 C500...
  • Page 19 FRONT PANEL 320667 PCB D536 D537 XM2205 J501 FB500 R536 R532 C514 R573 R509 U501 C534 R542 U502 U500 R540 C509 R534 3V3S FPP_POW R538 12VD C510 R515 C511 R530 STB_LED Q517 BG_PWM Q527 0935 FPP BOARD Vm1.0 CH_PWM J500 R526 CH_CS FPP_CLK...

  • Page 20: Amp Module Pcb

    AMP MODULE NOTES 320663 NO SERVICEABLE PARTS REPLACE AS COMPLETE MODULE THIS SPACE INTENTIONALLY LEFT BLANK...

  • Page 21: Parts List

    PARTS LIST PARTS LIST (Cont’d.) INTERCONNECT MAIN PCB 320665 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. Main board to FPP board 1.0mm,22pin,105 degree,black,L=510mm 44-0-003549 C3096, C3097, C3100, C3101, C3104, 22pJ,50V,0603,NPO 26-22051-00 PSU board to UCD Interface board UL1569#16AWG,red/red/black/blue/blue/yellow,VH-6Y,L=280mm 44-0-003422 C3105, C3106, C3107, C3108, C3111,...
  • Page 22 PARTS LIST PARTS LIST (Cont’d.) (Cont’d.) MAIN PCB 320665 (Cont’d.) MAIN PCB 320665 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. D2219 1SS355VMTE-17 33-40352-01 Q2335, Q2533 BC856BW,115 SOT323 31-00856-03 D2500, D2501, D2502, D2503, D2504, 1N4148W-NR,SOD123 33-44148-17 Q2320, Q2321, Q2322, Q2323, Q2324, BC856BW-7-F OR N31-00856-06 D2505, D2506, D2507...
  • Page 23 PARTS LIST PARTS LIST (Cont’d.) (Cont’d.) MAIN PCB 320665 (Cont’d.) MAIN PCB 320665 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R2076, R2103, R2223, R2224, R2225, 33W,0603,1/10W,±1%,RC0603FR-0733RL 07-93309-00 U2403, U2404 TLV1117LV33DCYR 03-01117-17 R2226, R2227, R2228, R2229, R2230, 33W,0603,1/10W,±1%,RC0603FR-0733RL 07-93309-00 U2002, U2006, U2010, U2014, U300,...
  • Page 24 PARTS LIST PARTS LIST (Cont’d.) (Cont’d.) INPUT PCB 320666 (Cont’d.) INPUT PCB 320666 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. DM01, DM02, DM03, DM04, DM05 BAS316,115 33-20316-01 RM03 220KW,0603,1/10W,±1%,RC0603FR-07220KL 07-92203-00 2.0mm,6pin, CNT-M200-1*6-GD-3/3/2-2 13-12006-03 RM01 27KW,0603,1/10W,±1%,RC0603FR-0727KL 07-92702-00 Used on INPUT BOARD with J106, J107, 01-2-093607 RM06...
  • Page 25 TH900 SCK08082MSY, 8W 2A A07-70080-01 L90201 3.3uH,LGB0810-3.3uH 08-02339-00 TR900 SC9352-145A 22-09352-00 NTC900 SL22-5R012, 5W, 12A 07-70509-03 T900 HJ-MI128-EF16 24-2-000979S NTC901 ST-22 90W W TYPE 70MM A07-70022-19 IC903, IC905 TL431CDBZR 03-00431-05 T900 0935-EE16 NIF OR 24-2-000980S IC900 CAP017DG-TL SO-8 CAP017DG-TL 03-00017-01...
  • Page 26 PARTS LIST PARTS LIST (Cont’d.) (Cont’d.) UCD INTERFACE PCB 320664 (Cont’d.) UCD INTERFACE PCB 320664 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. C4214, C4215, C4216, C4217, C4218, 100nK,50V,0603,X7R 26-10451-10 J438, J439, J448 2.54mm,2*18pin,CNT-F254-2*18-GS-850/3.0-N 13-22536-01 C4219, C4220, C4223, C4224, C4313, 100nK,50V,0603,X7R 26-10451-10 J427, J429...
  • Page 27 PARTS LIST PARTS LIST (Cont’d.) (Cont’d.) FRONT PANEL PCB 320667 (Cont’d.) UCD INTERFACE PCB 320664 (Cont’d) Ref. No. Description Part No. Ref. No. Description Part No. C528, C530 10uK,10V,0603,X5R/C1608X5R1A106KT000E OR 26-10611-10 R4147, R4148, R4149, R4150, R4246, 22KW,0603,1/10W,±1%,RC0603FR-0722KL 07-92202-00 D535 Red,WR-PB1608UE-L08 33-50603-21 R4247, R4248, R4249, R4250, R4363, 22KW,0603,1/10W,±1%,RC0603FR-0722KL...

  • Page 28: Repacking Instructions

    If a shipping carton or any of the interior part(s) are 400159 #10-32 x 3/4” screw needed, please call or write Customer Service 404080 #10 Flat washer Department of McIntosh Laboratory. BOTTOM PAD TOP (FILLER) PAD THIS SPACE INTENTIONALLY LEFT BLANK...
  • Page 29 POWER AMPLIFIER SERIAL NO. AGZ1001 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.

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