McIntosh-MC275_WV1536-pwr-sm 维修电路原理图.pdf

SERVICE MANUALPerformance Specifications . 2Notes . 2Rear Panel . 3Section Location . 4Block Diagram . 5Interconnection Diagram . 7 - 8Amplifier Schematic and PCB. 9 - 12Input Schematic and PCB . 13 - 14Parts List . 15 - 16Exploded View and Parts List . 17 - 18Repacking Instructions . 19CONTENTSSTEREOPOWER AMPLIFIERSTARTING WITH SERIAL NO. WV1536RadioFans.CN 收音机爱 好者资料库PERFORMANCE SPECIFICATIONS21. The heavy lines on the schematic denote the primarysignal path.2. Unless otherwise noted, all voltages indicated on theschematics are measured under the following conditions:a. AC input at 120 volts, 50/60Hz.b. All voltages are +/-10% with respect to ground. Ahigh impedance (10 megaohm) voltmeter must be used.3. Unless otherwise specified:a. Resistor values are in ohms.b. Capacitor values are microfarads (uF).c. Inductor values are in microhenries (uH).4. On PC board drawings, Square pad indicates:a. Polarized Capacitors - Positiveb. Diodes - Cathodec. Others - Pin 15. WARNINGParts marked with the symbol have criticalcharacteristics. Use only replacement parts recom-mended by the manufacturer.NOTESPower Output StereoMinimum sine wave continuous average power outputper channel, both channels operating is:75 watts into 4, 8 or 16 ohm loadPower Output Mono (Parallel)Minimum sine wave continuous average power outputis:150 watts into 2 ohm, 4 ohm or 8 ohm loadOutput Load Impedance4, 8, or 16 ohm (Stereo Mode)2, 4, or 8 ohm (Mono Mode)Rated Power Band20Hz to 20,000HzTotal Harmonic DistortionMaximum Total Harmonic Distortion at any power levelfrom 250 milliwatts to rated power output is 0.5%Intermodulation DistortionMaximum Intermodulation Distortion if instantaneouspeak output per channel does not exceed twice the ratedoutput, for any combination of frequencies from 20Hz to20,000Hz, with both channels operating is 0.5%A-Weighted Signal To Noise Ratio100dBFrequency Response+0, -0.5dB from 20Hz to 20,000Hz+0, -3dB from 10Hz to 70,000HzSensitivity1.2 Volt unbalanced inputs2.5 Volt balanced inputsWide Band Damping FactorGreater than 14Input Impedance90,000 ohms unbalanced180,000 balancedTube Compliment3 - 12AX7A Inputs and Phase Inverters4 - 12AT7 Voltage Amplifier and Drivers4 - KT88/6550 Power OutputPower Requirements100 Volts, 50/60Hz at 360 watts110 Volts, 50/60Hz at 3.6 amps120 Volts, 50/60Hz at 3.6 amps220 Volts, 50/60Hz at 1.8 amps230 Volts, 50/60Hz at 1.8 amps240 Volts, 50/60Hz at 1.8 ampsNote: Refer to the right side panel of the MC275 for the correctvoltage.Overall DimensionsWidth is 16-1/2 inches (41.91cm), Height is 8-1/4 inches(20.96cm) including feet, Depth is 12 inches (30.48cm)Weight67 pounds (30.5kg) net, 75 pounds (34.lkg) in shippingcartonRadioFans.CN 收音机爱 好者资料库3SECTION LOCATIONSBOTTOM VIEW WITH COVER REMOVEDTOP VIEW WITH COVER REMOVEDTERMINALBLOCKAMPLIFIERPCB2INPUTPCB3KT88 (4X)OUTPUTTRANSFORMER1POWERTRANSFORMER112AT712AT712AX7A12AX7ACHOKEFILTERMC275BLOCK DIAGRAM456MC275INTERCONNECT178AMPLIFIER 7506752AAMPLIFIER 7506752B910AMPLIFIER 7506752MC27511INPUT 75008231213PARTS LISTMC27512Ref. No. DescriptionPart No.INTERCONNECTF1FUSE 4A 250V SLO-BLO 5X20 IEC089135L1CHOKE FILTER 0.5H 800MA SLOTS122379RT1ASSEMBLY THERMISTOR CL-40 5R052008S1CABLE ASSY PWR SWCH171729T1POTTED TRANSFORMER POWER750086T2POTTED TRANSFORMER OUTPUT750085T3POTTED TRANSFORMER OUTPUT750085750675 AMPLIFIER PCBC1CAP ELECT 47UF 450V066560C2CAP MPF 0.1UF 630VDC064431C3CAP MPF 0.1UF 630VDC064431C4CAP ELECT 100UF 25V066573C5CAP ELECT 100UF 25V066573C6CAP MPF 0.1UF 5% 63VDC064325C7CAP MPF 0.1UF 5% 63VDC064325C8CAP MPF 0.1UF 5% 63VDC064325C9CAP MPF 0.1UF 5% 63VDC064325C10CAP ELECT 470UF 16V066508C11CAP ELECT 470UF 16V066508C12CAP PF 0.001UF 5% 63VDC064453C13CAP PF 0.001UF 5% 63VDC064453C14CAP MPF 0.0022UF 5% 63VDC064454C15CAP MPF 0.0022UF 5% 63VDC064454C16CAP MPF 0.1UF 630VDC064431C17CAP MPF 0.1UF 630VDC064431C18CAP MPF 0.1UF 630VDC064431C19CAP MPF 0.1UF 630VDC064431C20CAP ELECT 470UF 50V066469C21CAP ELECT 470UF 50V066469C22CAP POLYPROP 0.22UF 20% 1KVDC064432C23CAP POLYPROP 0.22UF 20% 1KVDC064432C24CAP POLYPROP 0.22UF 20% 1KVDC064432C25CAP POLYPROP 0.22UF 20% 1KVDC064432C26CAP POLY .047UF 10% 1000VDC064434C27CAP POLYPROP .047UF 10% 250VDC064364C28CAP ELECT 680UF 315V066549C29CAP ELECT 680UF 315V066549C30CAP ELECT 4700UF 35V066541C31CAP ELECT 680UF 315V066549C32CAP ELECT 680UF 315V066549C33CAP ELECT 47UF 450V066560C34CAP ELECT 47UF 450V066560C35CAP ELECT 47UF 450V066560C36CAP MPF 0.22UF 5% 63VDC064329C37CAP MPF 0.22UF 5% 63VDC064329D1DIODE ZENER 200V 1.5W070177D2DIODE ZENER 200V 1.5W070177D3DIODE ZENER 200V 1.5W070177D4DIODE ZENER 200V 1.5W070177D5DIODE ZENER 200V 1.5W070177D6DIODE ZENER 200V 1.5W070177D7DIODE ZENER 200V 1.5W070177D8DIODE ZENER 200V 1.5W070177D9DIODE ZENER 200V 1.5W070177D10DIODE BRIDGE RECT 1000V 6A070180D11DIODE SIL 400 PIV 1.5A070031D12DIODE SIL 400 PIV 1.5A070031D13DIODE RECTIFIER070178D14DIODE RECTIFIER070178F1FUSE 2A 250V SLO-BLO 5X20 IEC089123F2FUSE 2A 250V SLO-BLO 5X20 IEC089123F3FUSE T8AL 250V SLO-BLO 5X20 IEC089134F4FUSE T8AL 250V SLO-BLO 5X20 IEC089134J1CONN MALE 6 POS FRICTION LOCK117218J2CONN 3 POS MALE MTS100 NORMAL117214J3CONN 3 POS MALE MTS100 NORMAL117214J4BLADE FASTON W/FEET117708J5BLADE FASTON W/FEET117708J6BLADE FASTON W/FEET117708J7BLADE FASTON W/FEET117708J8BLADE FASTON W/FEET117708J9BLADE FASTON W/FEET117708J10BLADE FASTON W/FEET117708J11BLADE FASTON W/FEET117708J12BLADE FASTON W/FEET117708J13BLADE FASTON W/FEET117708J14BLADE FASTON W/FEET117708J15BLADE FASTON W/FEET117708J16BLADE FASTON W/FEET117708J17BLADE FASTON W/FEET117708J18BLADE FASTON W/FEET117708J19BLADE FASTON .187117726J20BLADE FASTON .187117726J21BLADE FASTON W/FEET117708J22BLADE FASTON W/FEET117708J23BLADE FASTON W/FEET117708J24BLADE FASTON W/FEET117708J25BLADE FASTON W/FEET117708J26BLADE FASTON W/FEET117708J27BLADE FASTON W/FEET117708J28BLADE FASTON W/FEET117708J29BLADE FASTON W/FEET117708J30BLADE FASTON W/FEET117708J31BLADE FASTON W/FEET117708J32BLADE FASTON W/FEET117708L1CHOKE 2.2 UH122405L2CHOKE 2.2 UH122405L3CHOKE 2.2 UH122405L4CHOKE 2.2 UH122405R1RES MF 1M 1% 1/4W144577R2RES MF 1M 1% 1/4W144577R3RES MF 221K 1% 1/4W144629R4RES MO 100K 5% 2W144698R5RES MO 100K 5% 2W144698R6RES MF 221K 1% 1/4W144629R7RES MF 221K 1% 1/4W144629R8RES MF 221K 1% 1/4W144629R9RES MF 1K 1% 1/4W144513R10RES MF 1K 1% 1/4W144513R11RES MF 100K 1% 1/2W144635R12RES MF 100K 1% 1/2W144635R13RES MF 1M 1% 1/4W144577R14RES MF 1M 1% 1/4W144577R15RES MF 1M 1% 1/4W144577R16RES MF 1M 1% 1/4W144577R17RES MF 10K 1% 1/4W144504R18RES MF 10K 1% 1/4W144504R19RES MF 10K 1% 1/4W144504R20RES MF 10K 1% 1/4W144504R21RES MF 100 OHM 1% 1/4W144568R22RES MF 100 OHM 1% 1/4W144568Ref. No. DescriptionPart No.14PARTS LIST cont3R23RES MF 100 OHM 1% 1/4W144568R24RES MF 100 OHM 1% 1/4W144568R25RES MF 8.25K 1% 1/4W144549R26RES MF 8.25K 1% 1/4W144549R27RES MF 121K OHM 1% 1/2W144588R28RES MF 121K OHM 1% 1/2W144588R29RES MF 121K OHM 1% 1/2W144588R30RES MF 121K OHM 1% 1/2W144588R31RES 698 OHM 1% 1/4W144511R32RES 698 OHM 1% 1/4W144511R33RES 698 OHM 1% 1/4W144511R34RES 698 OHM 1% 1/4W144511R35RES MF 2.21M 1% 1/4W144576R36RES MF 2.21M 1% 1/4W144576R37RES MF 2.21M 1% 1/4W144576R38RES MF 2.21M 1% 1/4W144576R39RES MF 221K 1% 1/4W144629R40RES MF 221K 1% 1/4W144629R41RES MF 221K 1% 1/4W144629R42RES MF 221K 1% 1/4W144629R43RES MF 10K 1% 1/4W144504R44RES MF 10K 1% 1/4W144504R45RES MF 10K 1% 1/4W144504R46RES MF 10K 1% 1/4W144504R47RES MO 46.4K 1% 1W144637R48RES MO 46.4K 1% 1W144637R49RES MO 46.4K 1% 1W144637R50RES MO 46.4K 1% 1W144637R51RES MF 90.9K 1% 1/4W144557R52RES MF 90.9K 1% 1/4W144557R53RES MF 1M 1% 1/4W144577R54RES MF 1M 1% 1/4W144577R55RES MF 1M 1% 1/4W144577R56RES MF 1M 1% 1/4W144577R57RES MF 200K 1% 1/4W144531R58RES MF 200K 1% 1/4W144531R59RES MF 200K 1% 1/4W144531R60RES MF 200K 1% 1/4W144531R61RES MO 100K 5% 2W144698R62RES MO 100K 5% 2W144698R63RES MO 100K 5% 2W144698R64RES MO 100K 5% 2W144698R65RES MO 100K 5% 2W144698R66RES MO 100K 5% 2W144698R67RES MO 100K 5% 2W144698R68RES MO 100K 5% 2W144698R69RES WW 220 OHM 10% 5W139256R70RES WW 220 OHM 10% 5W139256R71RES WW 220 OHM 10% 5W139256R72RES WW 220 OHM 10% 5W139256R73RES MO 10K 5% 2W144638R74RES MO 2.2K 5% 2W144666R75RES MO 100K 5% 2W144698R76RES MO 100K 5% 2W144698(F1)HOLDER FUSE 5X20MM PCB MOUNT178159(F2)HOLDER FUSE 5X20MM PCB MOUNT178159(F3)HOLDER FUSE 5X20MM PCB MOUNT178159(F4)HOLDER FUSE 5X20MM PCB MOUNT178159(V1)SOCKET 9 PIN TUBE CERAMIC178170(V2)SOCKET 9 PIN TUBE CERAMIC178170(V3)SOCKET 9 PIN TUBE CERAMIC178170(V4)SOCKET 9 PIN TUBE CERAMIC178170(V5)SOCKET 9 PIN TUBE CERAMIC178170(V6)SOCKET 9 PIN TUBE CERAMIC178170(V7)SOCKET 9 PIN TUBE CERAMIC178170(V8)SOCKET OCTAL TUBE CERAMIC178169(V9)SOCKET OCTAL TUBE CERAMIC178169(V10)SOCKET OCTAL TUBE CERAMIC178169(V11)SOCKET OCTAL TUBE CERAMIC178169750082 INPUT PCBJ1JACK PHONO GOLD117862J2XLR FEMALE HORIZ PCB WITH LATCH117814J3XLR FEMALE HORIZ PCB WITH LATCH117814J4CONN 3 POS MALE MTS100 NORMAL117214J5CONN 3 POS MALE MTS100 NORMAL117214J6CONN MALE 6 POS FRICTION LOCK117218R1RES MF 221K 1% 1/4W144629R2RES MF 100K 1% 1/4W144528R3RES MF 221K 1% 1/4W144629R4RES MF 100K 1% 1/4W144528S1SWITCH SLIDE DPDT148076S2SWITCH SLIDE DPDT148076Ref. No. DescriptionPart No.Ref. No. DescriptionPart No.1516EXPLODED VIEW and PARTS LIST1005653CHASSIS2005650RCA SPACER3101197SCREW HI/LO 4-24 X 3/8 PH RD BLK4404007WASHER LOCK 6 X .288 INT STAR5104165WASHER 3/8 INTERNAL TOOTH GOLD6402003NUT KEP 6-327750082ASSY INPUT PCB8084219POST BINDING DUAL 4MM THREAD9404198LOCK WASHER10410015NUT M4 INT STAR SS12171729CABLE ASSY POWER SWITCH13104165WASHER 3/8 INT TOOTH GOLD19400157SCREW MACH 6-32 X 1/4 PH PN20114012BALL STUD21165065TUBE 12AX7A McINTOSH22165067TUBE 12AT723165070TUBE KT88 WITH McINTOSH LOGO24017761AIR PIPE25400292SCREW MACH 6-32 X 3/8 PH FH BLK26750085POTTED TRANSFORMER OUTPUT27750086POTTED TRANSFORMER POWER28166126DECAL OUTPUT TRANSFORMER29166127DECAL POWER TRANSFORMER30005651TUBE COVER31017862PUSH-ON FOOT32125667NAMEPLATE33106012SPRING CLIP: PUSH-ON35017452KLIP WIRE36178161HOLDER FUSE 5 X 20mm IEC37404016WASHER INT STAR .5 X .630 X .02238102006NUT MACH 10-32 W/LOCK39078024GROMMET RUBBER 1” ID40078025GROMMET RUBBER 3/4” ID41017859SPACER NYLON 6-32 X 7/1642117487RECEPTACLE AC LINE43074091TERMINAL BLOCK ACRef. No.DescriptionPart No.44404001WASHER FLAT STEEL 4 X 9/32 X .02545402022NUT MACH 4-40 X 3/16 X 1/1646122379CHOKE FILTER47402005NUT MACH 8-32 W/LOCK48005425SUPPORT BRACKET49750675ASSY AMPLIFIER PCB50005426BOTTOM COVER51401078SCREW TAP 8-32 X 5/16 PH PN BLK52017542PLASTIC FOOT53400153SCREW MACH 8-32 X 1/2 PH PN54401109SCREW TT 6-32 X 5/16 PH PN BLKMC275REPACKING INSTRUCTIONS17The 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 thewithin schematic material, which is intended for information only.McINTOSH LABORATORY, INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK 13903 Printed in U.S.A. Part Number 041046STEREO POWER AMPLIFIERSERVICE MANUALSTARTING WITH SERIAL NO. WV1536MC275