McIntosh MI3 Maximum Performance Indicator Service Information.pdf

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1、nWntosb MAXIMUM PERFORMAN INDICA TOR nWntosb AUDIO DISPLAY OFF ON m k M k Jgj| M SCOPE TEST 1 HORIZONTAL POSITION VERTICAL POSITION 1 FOCUS w INTENSITY MI-3 MAXIMUM PERI l t S *11810 0 R M A N C E 1 N 0 t C A T 0 R panim SERVICE INFORMATION STARTING WITH SERIAL NO. 10E01 McIntosh laboratory inc. 2 c

2、hambers street Binghamton, new york MI-3 SCHEMATIC NOTES 1. Unless otherwise specified: Resistance values are in ohms, 1/2 watt, and 10% tolerance capacitance values are in microfarads (pF). 2. Printed circuit board components are outlined on the schematics by dotted lines. The circled numbers aroun

3、d the dotted lines correspond to the numbers on the PC Board 1ayouts. 3. The terminal numbering of rotary switches is for reference only. 4. All voltages indicated on the schematics are measured under the following conditions: a. Use of an 11 megohm input impedance VTVM. b. All voltages _+! 0% with

4、respect to chassis ground. c. No signal at input or antenna terminals. d. AC input at 117 volts, 50/60 Hz. e. Mode selector at test position. 5. In units with Serial Nos below 10E26, two neon bulbs (McIntosh Part No. 058-002) are used in place of R59* 6. In units with Serial Nos from 10E26 to 15E00,

5、 R60 and R61 are used. 7- In units with Serial Nos below 13E00, a 6W4 rectifier tube (McIntosh Part No. 165-016) is used in place of SR7. 8. In early units, PC Board 043-984 and R49 and R50 are not used. The arm of R48A is connected directly to pin No. 2 of SI and the arm of R48B is connected direct

6、ly to C7- AUDIO DRIVER P C. BOARD 043-984 HORIZONTAL AMPLIFIER 660K L 680 K IOPF AMPLIFIER C.R.T. CIRCUIT astigmatism 1 R 29 100 K MI-3 REPLACEMENT PARTS All parts able from not listed are common items radio parts jobbers. obtain- Replacement parts may be obtained when by PART NUMBER from: ordered M

7、cIntosh Laboratory, Inc. Customer Service Department 2 Chambers Street Binghamton, New York 13903 (telephone 607-723-3512) CAPACITORS Symbol N umber Description Part Number C3 Mylar .01pF 400V 064-002 C4 Elect. 20/20pF 500 /500 V 066-025 C5 Mylar .5pF 1000V 064-023 C6 Elect. 8pF 475V 066-052 C7 Myla

8、r .22pF 200V 064-013 C9, 10 Mylar .22pF 250V 064-043 Cl 1 Mylar .1pF 200V 064-01 1 D1 ODES SRI ,2 Se. rectifier 070-005 SR3,4 Se. rectifier 070-005 SR5,6 Se. rectifier 070-005 SR7 Se. rectifier 070-026 FUSES FI Fuse 1A si o-bl o 089-001 TRANSIST0RS Q1,2 Si. NPN t ransisto r 132-057 LAMPS NE2H Neon t

9、ube 058-009 TRANSFORMERS T1 Power transformer 159-068 POTENTIOMETERS R1 Signal strength cal. 134-206 R2 Deviation cal. 134-206 R3 Left gain 134-206 R4 Right gain 134-206 R5 Vertical position 134-206 R6 Horizontal position 134-044 R29 Astigmatism 134-047 R30 Intensity 134-041 R32 Focus 134-041 t m ii

10、iM 14 T v.% d ji STTSWiVnnWl k.7 R45 Vertical audio position 1 34-206 R48 Audio gain 134-171 RESISTORS R4) Wirewound 15k 10% 10W 139-040 R42 Wirewound 20k 10% 10W 139-018 SWITCHES SI Selector switch 146-100 S2 Power on-off 1 46-040 TUBES VI ,2 6EA8 165-044 V3,4 6EA8 165-044 V5 3RP1 (CRT) 165-028 V6

11、6EA8 165-044 V7,8 0B2 1 65-027 FRONT PANEL therefore, be sure to locate the rectifier and its leads to provide ade quate insulation. Use spaghetti on the rectifier leads. Keep the rectifier leads short to avoid rectifier vibration problems. 3. This completes the modifications. Service bulletin 104 also relates to this product. If trouble has been experienced this modification should be installed at this time. MI-2/MI-3