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Macintosh MC275 Service Manual

Summary of MC275

  • Page 1

    Service manual performance specifications ........................................ 2 notes ......................................................................... 2 rear panel .................................................................. 3 section location .......................................

  • Page 2

    Performance specifications 2 1 . The heavy lines on the schematic denote the primary signal path. 2. Unless otherwise noted, all voltages indicated on the schematics are measured under the following conditions: a. Ac input at 120 volts, 50/60hz. B. All voltages are +/-10% with respect to ground. A h...

  • Page 3

    3 section locations bottom view with cover removed top view with cover removed terminal block amplifier pcb 2 input pcb 3 kt88 (4x) output transformer 1 power transformer 1 12at7 12at7 12ax7a 12ax7a choke filter mc275.

  • Page 4

    Block diagram 4.

  • Page 5

    5 6 mc275 interconnect 1.

  • Page 6

    7 8 amplifier 750675 2a.

  • Page 7

    Amplifier 750675 2b 9 10 amplifier 750675 2 mc275.

  • Page 8

    11 input 750082 3 12.

  • Page 9

    13 parts list mc275 1 2 ref. No. Description part no. Interconnect f1 fuse 4a 250v slo-blo 5x20 iec 089135 l1 choke filter 0.5h 800ma slots 122379 rt1 assembly thermistor cl-40 5r 052008 s1 cable assy pwr swch 171729 t1 potted transformer power 750086 t2 potted transformer output 750085 t3 potted tr...

  • Page 10

    14 parts list con’t 3 r23 res mf 100 ohm 1% 1/4w 144568 r24 res mf 100 ohm 1% 1/4w 144568 r25 res mf 8.25k 1% 1/4w 144549 r26 res mf 8.25k 1% 1/4w 144549 r27 res mf 121k ohm 1% 1/2w 144588 r28 res mf 121k ohm 1% 1/2w 144588 r29 res mf 121k ohm 1% 1/2w 144588 r30 res mf 121k ohm 1% 1/2w 144588 r31 re...

  • Page 11

    15 16 exploded view and parts list 1 005653 chassis 2 005650 rca spacer 3 101197 screw hi/lo 4-24 x 3/8 ph rd blk 4 404007 washer lock 6 x .288 int star 5 104165 washer 3/8 internal tooth gold 6 402003 nut kep 6-32 7 750082 assy input pcb 8 084219 post binding dual 4mm thread 9 404198 lock washer 10...

  • Page 12: Stereo Power Amplifier

    Repacking instructions 17 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 wa...