McIntosh MC462 Service Manual

McIntosh MC462 Service Manual

Quad balanced 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
Main Schematic and PCB .....................................9 - 14
Rectifier Schematic and PCB ..............................15 - 18
Capacitor Schematic and PCB ............................19 - 22
SERVICE MANUAL
MC462
QUAD BALANCED
POWER AMPLIFIER
SERIAL NO. AGP1001 And Above
CONTENTS
Left Input Schematic and PCB ...................................23 - 26
Right Input Schematic and PCB ..........................27 - 30
Heatsink Schematic and PCB ..............................31 - 36
Left Terminal Schematic and PCB .......................37 - 40
Right Terminal Schematic and PCB .....................41 - 44
Display Schematic and PCB................................45 - 52
Parts List .............................................................53 - 59
Notes ........................................................................60
Repacking Instruction ................................................61
MC462

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Summary of Contents for McIntosh MC462

  • Page 1: Table Of Contents

    MC462 MC462 QUAD BALANCED POWER AMPLIFIER SERIAL NO. AGP1001 And Above CONTENTS Performance Specifications ..........2 Left Input Schematic and PCB ........23 - 26 Notes ................2 Right Input Schematic and PCB ......27 - 30 Rear Panel ..............3 Heatsink Schematic and PCB ......31 - 36 Section Location ............4...
  • Page 2: Performance Specifications

    240V ~ 50/60Hz at 6 Amps Input Sensitivity (for rated output) Standby: less than 0.5 watt 4.2 Volts Balanced Note: Refer to the rear panel of the MC462 for the correct 2.1 Volts Unbalanced voltage. Signal To Noise Ratio (A-Weighted)
  • Page 3: Rear Panel

    MC462 REAR PANEL...
  • Page 4: Section Location

    SECTION LOCATIONS DISPLAY DISPLAY METER DISPLAY Top View METER LIGHT LIGHT METER LIGHT HEATSINK CAPACITOR LEFT INPUT RIGHT INPUT Bottom View MAIN RECTIFIER R TERMINAL L TERMINAL...
  • Page 5: Block Diagram

    MC462 BLOCK DIAGRAM POSITIVE CURRENT LIMITER CURRENT POWER DIFF VOLTAGE INDICATOR PREDRIVER DRIVER TRANSDUCER GUARD OUTPUT CURRENT ThermalTrak CURRENT SOURCE DC BIAS UNBALANCED DIFF VOLTAGE INPUT PREDRIVER DRIVER OUTPUT RECTIFIER METER UNBALANCED OUTPUT THERMAL LEFT NEGATIVE VOLTAGE SENSORS METER OUTPUT...
  • Page 6 INTERCONNECT MC462 TRANSFORMER WIRING AND FUSE REPLACEMENT (CONTACT MCINTOSH FOR CURRECT TRANSFORMER P/N) Voltage BLK BLK/GRY GRY VIO WHT/VIO BRN 1 BRN 2 Jumper Location (JMP1) Main Fuse (F1) T15AH250V T15AH250V T15AH250V WHT 24 AWG WHT 18 AWG TERMINAL T8AH250V...
  • Page 7 MC462 MAIN 752270 SCH 1of 3 C U R R EN T LOG AM P +14VML U24:1 1000pF -5VML -5VML 33.2k METER D R IVER +14VML +14VML 1000µF U24:2 18.2k H S OUT L J9 :1 U26:2 Q 16 AUT OF L...
  • Page 8 MAIN 752270 SCH 2 of 3 173085 +12V J11:1 ___ TAB J11:4 350mA ON/OFF 100V JMP1 110V J11:7 120V PRIM ARY 47.5k J11:10 J12:10 J12:1 220V 230V 240V J12:4 AC DET +12V J13:2 AC DETECTOR TEST ONLY NO CONNECTION APPLY 12VD C TO ENERGI ZE RELAYS WITH NO AC POWER J13:1...
  • Page 9 MC462 MAIN 752270 SCH 3 of 3 MET ER V L MET V PG LIGH T J5:6 DRIVER S MUTE J3:1 MUTE J5:5 J3:2 L PG L PG J5:1 J3:3 +15V +15V L PG PANEL LIGH T J5:3 L PG LT...
  • Page 10 MAIN 752270 PCB...
  • Page 11 MC462 RECTIFIER 752098 SCH +V BRG -V BRG BRIDGE RECTIFIER Rectifier...
  • Page 12 RECTIFIER 752098 PCB...
  • Page 13 MC462 CAPACITOR 752167 SCH +V AMP +V AMP J1:1 J7:1 -V AMP -V AMP J1:2 J7:2 +V AMP +V AMP J2:1 J8:1 -V AMP -V AMP J2:2 J8:2 PGND...
  • Page 14 CAPACITOR 752167 PCB...
  • Page 15 MC462 LEFT INPUT 752161 SCH J5 :8 F B C OM 1.96k 22.1 2.37k J5 :7 L (-) L - IN P IN P +14V J5 :9 GN D +14V J5 :12 U1:1 10µF J5 :11 PG AT T J3 :1 2.21M...
  • Page 16 LEFT INPUT 752161 PCB...
  • Page 17 MC462 RIGHT INPUT 752162 SCH J5:8 F B C OM 1.96k 22.1 2.37k J5:7 R (-) R - IN P IN P +14V J5:9 GN D +14V J5:12 U1:1 10µF PG AT T J3:2 2.21M R PG J5:2 R PG...
  • Page 18 RIGHT INPUT 752162 PCB...
  • Page 19 MC462 HEATSINK 752164 SCH 1 of 2 +V AMP DIFFERENTIAL VOLTAGE 100µF J1:4 PG ATT J1:5 PG ATT FB COM J1:1 2.21M FB COM DRV + 1.8V J1:3 -18V 2.21M AMP MUTING CURRENT FB 8 J2:3 SOURCE J2:5 FEEDBACK NETWORK FB 2 4.75k...
  • Page 20 HEATSINK 752164 SCH 2 of 2 +V AMP 100pF 1. 8V DRV + DRIVER 1. 2V Q29:1 CURREN T OU TPU TS LI M ITER Q31:1 1.8k Q33:1 Q35:1 BIAS ADJUSTMENT MP11 ADJUST R55 FOR 21-25mV DC ACROSS J7 WITH NO INPUT SIGNAL AND HEATSINKS COOL Q37:1 OGND...
  • Page 21 MC462 HEATSINK 752164 PCB...
  • Page 22 LEFT TERMINAL 752165 SCH LEFT OUTPUTS J8:6 L (+) L + FB8 FB 8 J8:7 J8:5 L (+) L + FB2 FB 2 J8:2 L (-) L - FB8 FB 8 J8:3 L (-) J8:1 L - FB2 FB 2...
  • Page 23 MC462 LEFT TERMINAL 752165 PCB...
  • Page 24 RIGHT TERMINAL 752166 SCH RIGHT OUTPUTS R (+) J8:6 R + FB8 FB 8 J8:7 J8:5 R (+) R + FB2 FB 2 J8:2 R (-) R - FB8 FB 8 J8:3 R (-) J8:1 R - FB2 FB 2...
  • Page 25 MC462 RIGHT TERMINAL 752166 PCB...
  • Page 26 DISPLAY 752169 SCH L CAL 2 J1:1 L MET J1:2 HOLD J1:3 L CAL 1 J7:9 J10:4 J1:4 J7:8 J10:5 L PG LT J7:7 +15V J10:6 +15VR +15V J1:5 R PG LT J1:6 J1:7 INTENSI TY COLOR J1:8 J7:12 J10:1 J7:11 J10:2 M ET LT S...
  • Page 27 MC462 DISPLAY 752169 PCB...
  • Page 28 NOTES...
  • Page 29: Parts List

    MC462 PARTS LIST INTERCONNECT Ref. No. Description Part No. Ref. No. Description Part No. CABLE FFC12 CONDUCTOR 70MM 171318 CAP MPF 1UF 5% 63VDC 064337 CABLE FFC12 CONDUCTOR 70MM 171318 CAP POLYPROP 0.15UF 10% 275V 064464 CABLE FFC12 CONDUCTOR 70MM 171318 CAP .47uF 50V 20% X7R SMD0805...
  • Page 30 PARTS LIST (Cont’d.) MAIN PCB 752270 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. HEADER 2MM 7PIN R-ANGLE 117941 RES SMD0805 4.75K 1/8W 1% 145008 HEADER 2MM 7PIN R-ANGLE 117941 RES TF 47.5K 1% 0.125W SMD0805 145132 HEADER 2MM 7PIN R-ANGLE 117941 RES SMD0805 4.75K 1/8W 1%...
  • Page 31 MC462 PARTS LIST (Cont’d.) MAIN PCB 752270 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 22.1K 1/8W 1% 145012 IC SINGLE NAND SCHMITT SMD 133724 RES SMD0805 22.1K 1/8W 1% 145012 IC SINGLE NAND SCHMITT SMD...
  • Page 32 PARTS LIST (Cont’d.) LEFT INPUT PCB 752161 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. JACK HEADPHONE DUAL BLACK 1/8” 117825 RES TF 1K 1% 0.1W SMD0805 145117 HEADER 2MM 12 PIN R-ANGLE 117944 RES TF 1K 1% 0.1W SMD0805 145117 JACK DUAL RCA 118020...
  • Page 33 MC462 PARTS LIST (Cont’d.) HEATSINK PCB 752164 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. STANDOFF PCB 0.144 DIAX0.188L 412186 RES TF 47.5K 1% 0.125W SMD0805 145132 STANDOFF PCB 0.144 DIAX0.188L 412186 RES TF 1k 1% 0.1W SMD0805 145117 STANDOFF PCB 0.144 DIAX0.188L...
  • Page 34 PARTS LIST (Cont’d.) LEFT TERMINAL PCB 752165(Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. BLADE FASTON W/FEET 117708 DS25 LED RGB SMD 058218 BLADE FASTON W/FEET 117708 DS26 LED RGB SMD 058218 BLADE FASTON W/FEET 117708 DS27 LED RGB SMD 058218 BLADE FASTON W/FEET...
  • Page 35 MC462 PARTS LIST (Cont’d.) DISPLAY PCB 752169 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 3.92K 1/8W 1% 145027 RES SMD0805 3.92K 1/8W 1% 145027 RES SMD0805 3.92K 1/8W 1% 145027 RES SMD0805 3.92K 1/8W 1% 145027 RES SMD0805 3.92K 1/8W 1%...
  • Page 36: Notes

    NOTES...
  • Page 37: Repacking Instruction

    034479 Shipping skid condition. If a shipping carton or any of the interior part(s) are needed, please call or write Customer 401212 1/4 - 20x2-1/4 cap screw Service Department of McIntosh Laboratory. 104058 Flat washer...
  • Page 38 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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