McIntosh MR77 Tuner Service InformationLate Production.pdf

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1、FM TUNER fe| KKSfZ | f| Mi V SsM 1 1 W 1 %s# l*sa t “ K I If 1 : STARTING WITH SERIAL NO. 53Y82 f McIntosh laboratory inc. 2 CHAMBERS STREET BINGHAMTON, NEW YORK MR 77 ELECTRICAL SPECIFICATIONS SENSITIVITY 2pV for better than 35dB quieting. 2.5 pV IHF usable sensitivity typical . SIGNAL TO NOISE RAT

2、IO Better than 75dB below 100% modulation. HARMONIC DISTORTION Less than 0.2% mono or stereo at 100% modulation 20Hz to 15kHz. Typically less than 0.05% at 1 kHz. FREQUENCY RESPONSE 1dB 20Hz to 15KHz with standard 75pS de-emphasis. CAPTURE RATIO Better than 2.5dB IHF. SPURIOUS REJECTION Greater than

3、 lOOdB IHF. IMAGE REJECTION Greater than lOOdB at 90MHz; greater than 90dB at 105MHz IHF. STEREO SEPARATION Better than 40dB at 1 kHz. SCA FILTER 50dB down from 67kHz to 7kHz; 275dB per octave slope. POWER REQUIREMENTS 117VAC, 50 - 60Hz, 35W. DETECTOR PRINTED CIRCUIT BOARD 044-116 FM DETECTOR PRINTE

4、D CIRCUIT BOARD 044-116 MR 77 SCHEMATIC NOTES 1. Unless otherwise specified: Resistance values are in ohms, 1/4 watt, and 10 tolerance capacitance values smaller than 1 are in microfarads (uF); capacitance values greater than 1 are in picofarads (dF); inductors are in microhenries (uH). 2. Printed c

5、ircuit board components are outlined on the schematics by dotted lines. The circled numbers around the dotted lines correspond to the numbers on the PC Board iayout s. 3. The heavy lines on the schematics denote the primary signal path. 4. The terminal numbering of rotary switches is for reference o

6、nly. 5. All voltages indicated on the schematics are measured under the following conditions: a. Use of an 11 megohm input impedance VTVM. b. All voltages +10/ with respect to chassis ground. c. No signal at input or antenna terminals. d. AC input at 117 volts, 50/60 Hz. e. Front panel controls at:

7、Tuning indicator 100MHz (no signal) Muting Off Vo 1ume Ful1y CW Mode Auto Stereo Filter Out Pane 1 Lights Bi i ght LAMP obtainee when o rdered McIntosh Laboratory, Inc. Customer Service Department 2 Chambers Street Binghamton, New York 13903 (telephone 607-723-3512) CAPAC 1 TORS Symbo1 Number Desc r

8、i pt i on Part Number C1 2 ,1 3 Silver Mica 270pF 20V 063-010 C304 Tant. E1ec t. lOpF 35 V 066-239 C306 Elect. 2 2 pF 25V 066-240 C 308 Tan t. Elect. 1 OpF 35V 066-239 C309 Polys t y rene 2700 p P 064-239 c 31 o Tan t . Elect. 10pF 35 V 066-149 C 31 l Polys t y rene 1500pF 064-092 C31 A Tan t. Elect

9、. 1 OpF 35 V 066-239 C31 6 Tan t . E 1 ec t . 1 OpF 35V 066-239 C 3 2 3 Elect. 1 pF 50V 066-242 C 3 2 5 Elect. 2 2 uF 25V 066-240 C326,327 Poly st y rene 4700pF 064-09 1 C328 Tan t. E1ec t . 10pF 35 V 066-239 C33 1 Pol ys t yrene .0033pF 064-090 C 3 34 Polystyrene .003 3 pF 064-090 C335 Polys t y re

10、ne 4700pF 064-091 C336,337 Polystyrene 2 700p F 064-093 C 3 3 8 Po1ys t y rene .033uF 064-089 0404,405 Elect. 22 pF 25 V 066-240 0408,409 Tant. Elect . lOpF 35V 066-239 0503 Elect. 2 0 0 p F 50V 066-154 0504 Elect. 5/300/150/1000 200/50/50/30 066-155 0505 Mylar . 2 2 pF 250V 064-068 0506 Elect. 1 50

11、p F 63V 066-205 0507 Elect. 47pF 1 6 V 066-182 DIODES D101,102 Ge. signal diode 070-003 D103,104 Ge. signal di ode 070-003 D201,202 Si. signal diode 070-022 D203,204 Si. signal di ode 070-047 D301 , 302 Si. signal diode 070-047 D303,304 Si. signal diode 070-047 D305.306 Si. signal diode 070-047 D 30

12、8 Si . signal diode 070-047 D 309,310 Si . signal diode 070-047 D3I 1 Si . signal diode 070-047 D 501 ,502 S i . rectifier diode 070-031 D503,504 Si . reelifier diode 070-031 D 505 Zener diode 24V 070-065 CHOKES LI An tenna CO i 1 122-087 L2 RF CO i I i nput 122-088 L3 Mixer coil 122-090 L4 RF CO i

13、1 output 122-089 L5 Choke 1 . 5 pH 122-032 L6 0s ci 1 1 ator coil 122-117 L7 Choke 1 5pH 122-032 L8 Choke 75uH 122-013 L201,202 Choke 7 5 pH 122-013 L30I Fi Iter roil (19 kHz) 122-094 L 302,303 Fi Iter coil (SCA) 1 22-093 L304 Cho ke IMH 122-092 L501 Choke 2 .2 pH 122-001 TRANS 1STORS Q1 Si . NPN t

14、ransistor 132-066 Q2 Si . Junction F.E.T. 132-097 Q3 S i . Junction F.E.T. 132-068 Q4 Si . NPN Lransistor 132-087 Q20I,202 Si . NPN Iransistor 132-066 Q30I S i . NPN transistor 132-092 Q302 Si . NPN transistor 132-094 Q303 s; . NPN transistor 132-092 Q304 Si . NPN transistor 132-094 Q305 Si . NPN tr

15、ansistor 132-094 Q306 Si . NPN L ransistor 132-042 Q401,402 Si . PNP t ransis tor 132-096 Q403,404 S i . NPN transistor 132-093 Q405,406 Si . NPN t ransis Lor 132-052 Q407 Si . NPN transistor 132-054 Q501 Si . NPN transistor 132-065 Q502 Si . PNP transistor 132-094 FUSES F 5 01 Fuse . 5A s 1 o-b 1 o

16、 089-020 POTENTI0METERS R! 02 Full scale adj . 134-260 R 1 06 Mi d sea 1 e adj . 134-260 MR 77 R203 Bias adj . 134-265 R210 M30 1 adj . 134-265 R 31 7 Audio level 134-258 R401 Separation adj. 134-260 R418 Volume control 134-217 RESISTORS R205.206 Wi rewound 2200 5/- 1W 139-076 R207.208 Film 56.20 1W

17、 144-014 R333. 334 Film 33k if 1W 144-015 R338,339 Film 33k 1/ IW 144-015 R503 Wirewound ISO 10 5W 139-041 R508 W i r ewo u n d 2 0 1 0 % 5W 139-005 R509 Wirewound 1 .80 107 IW 139-077 SWITCHES S301 Mode selector 146-138 S 302 Mutieg switch 146-138 S 303 Stereo filter 146-137 S502 Dial scale in tens

18、it y 148-023 TRANSFORMERS T 1 Baiun 043-226 T2 Mixer 162-051 T 1 0 I 1st 1F fi1 ter 162-053 T 1 02 1st IF filter 162-052 T1 03 2nd IF filter 162-053 T1 04 2nd IF filter 162-052 T201 Driver transformer 044-121 T202 Output transformer 044-121 T203 FM detector 044-123 T 30 1 RF transformer (19 kHz) !62

19、-055 T302 RF transformer (38 kHz) 162-054 T501 Power transformer 044-120 TUBES V401 6HU6 165-025 INTEGRATED CIRCUITS 1C) 1nteg rated circ uit 133-005 IC101.102 1nteg rated circ uit 133-002 1 C 301 A , B Integrated circuit 133-004 METERS Ml 01 Signal strength meter 1 24-005 M301 Tuning meter 124-006

20、MR 77 SCHEMATIC PART NO. 0 3 8- 9 7 9 K30 1 RELAY Reed relay 087-008 LAMPS ; 1 847 (Meter 1 amp ) 058-008 1 866 ( Front panel ) 058-014 1828 (MPX lamp) 058-027 Festoon lamp (Dial glass) 058-032 FRONT PANEL & TRIM Front panel 044-109 Front panel end caps 018-120 Tuning knob 044-122 Muting control kno

21、b 044-372 Mode selector knob 044-372 Stereo filter knob 044-372 Volume control knob 044-372 MOUNT 1NG SYSTEM Shelf bracket (right) 043-592 Shelf bracket (left) 043-593 Mounting template A100 038-179 Hardware package 043-446 MISCELLANEOUS ITEMS FM dipole antenna 170-033 Dial glass 044-164 P 0inter 043-876 Dial cord (complete) 044-226 Fuseho1der 178-001 AC power cord 170-021 Shipping car Lon 044-238 Owners manual 038-912 Plastic feet 017-041 Push terminal (antenna) 074-033 Audio cable (61) 170-015 fU- frv&To prireft 15C0430S7-M6979