McIntosh MX112 Tuner-Preamp Service Information Late Production.pdf

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1、FM/AM TUNER PREAMP SERVICE INFORMATION STARTING WITH SERIAL NO. 40S00 t McIntosh laboratory inc. 2 chambers street binghamton, new york MX 112 MX 112 ELECTRICAL SPECIFICATIONS FM TUNER SECTION PREAMPLIFIER SECT I ON USABLE SENSITIVITY Better than 2,5pF (IHF usable sensiti vity) SIGNAL TO NOISE RATIO

2、 Better than 65dB FREQUENCY RESPONSE +0.5dB, 20Hz to 20,000Hz DISTORT ION Less than 0.1% at 2.5 volts 20Hz to 20kHz HARMONIC DISTORTION Mono, less than 0.5%. Stereo, less than 0.8%. FREQUENCY RESPONSE Flat from 20Hz to 20kHz with standard de-emphasis and 19kHz pilot filter CAPTURE RATIO Better than

3、1 . 5dB SPURIOUS REJECTION 90dB or greater IMAGE REJECTION 75dB or greater (at 100MHz) STEREO SEPARATION Better than 30dB at 1 kHz AM TUNER SECTION SENSITIVITY Better than 12pV at 1000kHz (using ex ternal antenna input) SIGNAL TO NOISE RATIO Better than 55dB HARMONIC DISTORTION Less than 1% at 30% m

4、odulation FREQUENCY RESPONSE Down 6dB at 5kHz SELECTIVITY 10kHz at -6dB INPUT SENSITIVITY (phono 1 and phono 2) 2 millivolts for 2.5 volts output at I kHz INPUT SENSITIVITY (aux, tape) 0.25 volts for 2.5 volts output HUM AND NOISE (phono 1 and phono 2) 72dB below 10 millivolt input HUM AND NOISE (au

5、x, tape) 85dB below rated output OUTPUT (main) 2.5 volts with rated input. Up to 10 volts can be developed without distor tion. FM and AM will produce up to 10 volts output at 100% modulation. OUTPUT (tape) 0.25 volts with rated input. Phono input signal of 10 millivolts produces 1.2 volts output. F

6、M and AM will produce 1 volt output at 100% modulation. OUTPUT (center channel) 2 volts with rated input to both channels BASS CONTROL -18dB to +16dB at 20Hz TREBLE CONTROL +20dB to 20,000Hz LF FILTER Flat or roll off below 50Hz, down 12dB at 20Hz HF FILTER Flat or roll off above 5000Hz, down 12 d B

7、 at 20,000Hz IMAGE REJECTION 60dB or greater at 1000kHz POINTER DRIVE TUNING CONDENSER DRUM POINTER ADJUSTMENT SCREW Step 1 Step 2 Step 3 Step 4- (TO LEFT (TO IDLER Before stringing unit, turn pointer adjustment screw until pulley A is in the center of its travel. String unit as shown. After stringi

8、ng unit, turn tuning shaft until pointer is as far to the left as it will go. Turn the pointer adjust ment screw until the pointer coincides with the zero bar of the logging scale. TUNING CONDENSER DRUM Turn the tuning knob making the pointer move back and forth from one end of the dial scale to the

9、 other. Return pointer to the far left DIAL CORD SEQUENCE BLACK (TO TUNING SHAFT) POINTER DIAL STRINGING MX 112 SCHEMATIC NOTES Unless otherwise specified: Resistance values are in ohms, 1/4 watt, and 10% tolerance; capacitance values smaller than 1 are in microfarads (piF); capacitance values great

10、er than 1 are in picofarads (pF); inductors are in microhenries (pH). Printed circuit board components are outlined on the schematics by dotted lines. The circled num bers around the dotted lines correspond to the numbers on the PC Board layouts. The heavy lines on the schematics denote the pri mary

11、 signal path. The terminal numbering of rotary switches is for reference only. All voltages indicated on the schematics are mea sured under the following conditions: a. Use of an 11 megohm input impedance VTVM. b. All voltages + 10% with respect to chassis g round. c. No signal at input or antenna t

12、erminals. d. AC Input at 117 volts, 50/60Hz. e. Front panel controls at: Tuning indicator 100MHz (no s ignal) Volume Fully CCW Mode Stereo Muting Out Input Selector AM (to measure AM section) FM (to measure FM section) Panel Lights Bright MX 112 LEFT CHANNEL PREAMP. PRINTED CIRCUIT BOAR RIGHT CHANNE

13、L PREAMP. PRINTED CIRCUIT BOARt /traLK MX 112 MX 112 FM/AM TUNER SECTION UmulJ f(WWTj T MX 112 PREAMPLIFIER SECTION STEREO MX 112 LEFT CHANNEL PREAMP PRINTED CIRCUIT BOARD 04399l PREAMP. PC BOARDS POWER SUPPLY PC BOARD o O 0 ct p H O 4) 4 P1 P H- H* H H* H H O 4 CD CD 4 4 ct O P H-* (W s: 0 -H ct !

14、- CD o H 0 73 CD H H P era 0 M ct l I* o p P CD H* 11 0 CZ CD CD H ct o d H* CD CD 0 0 3 i P uera CL CO 0 0 p H O CD P CO O H* 0 ct E P13 3 ct p O 4 ct o X CD P CD O 4 3 P ct 4 P 43 o Ct p* O ct ct o 3 ct P Ct i-1 h- 0 0 p 0 0 on - 0 CD CO CD O ct h* *-b 1 P P 0 ct 4 P -3ctO p d O o f3- P o 4 H* 0 c

15、t U H o o P 4 P O 1 3 CL P 0 4 0 o 4 Co o 4 0 O P H-b P *o O p 0 H* H* ct ct 4 K 0 4 O P O CD P y P 0 4 CL ct 1 0 H* H O H ct w P K) p o -0 o vn T OJ ro I-1 o W o i1 s 4 0 M o p 2 2 4 o H 4 ,. ,. ,. s p 1 0 W s K p 43 4 o 0 0 H P 0 P P o 4 0 0 N FT P P P 0 P o ep 4 4 4 4 M i 0 0 Qi 3 3 73 0 H o P P

16、0 ro 4 ct ct o s; o ! o 0 0 H w M 4 c: 0 ct o H-* _ ct o P 0 vn CD ct 4 H td CD 1 P m 0 o H* o o o P o 4 4 O P p P ?r H* ct H 0 0 p 4 0 hC3 Q 4 P O P P P Qi H M ct H* 0 1* w 0 0 P P ct ct Zll XW i I Ph 0 +3 0 0 0 o Pi 0 0 C OT o h ft-to Pi Eh p 0 TO TO G G ra 0 cd h p ft rA )PH N oft p 0 o 0 2 eg )J

17、z; -5 CM TO 0 Ph 0 o 0 Pift TJ G P G 5 H 0 Pi H ft 0 Ph Eh 0 2 a G H G Ph TO 0 H M P O c P ft p 0 p Pi p 05. P OiOH O rA O P co G G cd a) ft ft o P 0 U 0 0ft TO Ph GOO P P *H lI JsrH ftft 0 co 0 0 CO II P cO aJ 0 5 ft Ph O P O H 0 0 TO 0 Ph Clip O OOP G bO ft G H cd P ft C cd tiO cd ft p P co CO cd

18、P Ph 0 0 t G 0 0 p bO 0 O p p cd G 0 G 0 P p cd P cd 0 bO * cd w P 0 P CO O cd 0 Ph P G P pn EH P g a ft 0 p 0 G Cd O o Ph P 0 G P 3 G P ft P 0 G o p ft p TO G cd Pi co 0 P p cd cd Ph 0 G ft O 0 O ft cd 1 bD 0 5 TO G 0 H G H G 0 0 O 0 0 0 G P ft P cd *- G P 0 o O 0 G ft P 0 bO O 0 Ph P 0 0 P P 0 O 0

19、 P P ft ft rH H Pi Pi O O O 0 0 p =tfcT0 ft EH cd Ph iiG G G Ph H 03 cd TO cd cd H 0 *H G Ph O Ph Gift P P 0 -CO P O ft ft O ft ft sO G G p cd eh * G G 0 G G O bOP O ft o *rl CO *H co 0 G P TO Cd * 0 O ft G 3 P ft G H O CO o P P 0 G P G P 0 O pH p 0 PiiO 0 P P ft bD Ph ft 0 Ph 1A 0 P 0 ftP O ft ft N

20、 0 TO ft O p 0 0 P 3 O ft * P P p TO 0 TO ft c 3 g bO 0 O p ft 0 G Cd P* o 0 W 0 ft ft CM ft p o o O Ph rA bOTO CO Ji G p p pq P O TO G G c O p TO P P 0 0 P P Ph G 0 Ph ft C 50 0 ft 0 O G Ph P OHO O P G Ph B m 0 P G C lAft P 0 O C p O O 0 p B co bD P P G P G 0 ftp G ft G 0 P ft P *r-i ft G G 3 to GO

21、 P O 0 +i N 0 W Ph N 0 t- 3 Ph OlA 0 h r*- 0 0 P 0 3 ft P bO p P 0 H 0 0 ft 0 bQP 0 O 0 O ft C. n TO 0 G P bD E ft 0 P 0 P X bD P cd 0 O G ft -d O Eh Pi 0 S p o Pi p ftP 0 O Pi vO P o ft o Ph 0 TO 0 G Pi O O O O 0 0 ft o nQ P ft 0 Ph O OEH Ph O - P U 0 ft 0 O o o i Ph r P ft Ph ft Ph 0 * CM O Ph - 0

22、 vO O Ph P ft P iH 0 Ph G Ph P ft 0 ft O 0 bC 0 G 0 Ph 0 G P P P P P ft 0 0 0 G 0 ft O bO G P Ph p o to S ft p os G H JjU ft P G 0 p CM H P CM O P ft EH TO P 0 G O P ft POP 0 G TO G O 0 G POO OOP 0 TO G 0 G G ft 0 O O o o ft 0 Ph TO O Eh G 0 ft O P ft Eh TO P 0 G O P ft POP 0 G G O G O O O p TO 0 G

23、ft 0 O O O ft 0 Ph TO O Eh G 0 ft bD G 0 P P ft 0 0 O Cd G G P Ph G p 0 O $ S C, :V i) OP Pi * O G 0 rq cd P ? o o N ft N ft IAS O O H O 04 CO cn oo MX 112 fclA * O -p ca 0 ft G OB 5 ft *H ft 70 0 TO G CM O H TO -P p 0 cd-P H G 3 0 G 42 C o 0 bO 0 C 0 *H ftlAft ft POH 3 Cd rH O G cd 0 o c g -h o C G

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25、o 00 TO 0 G P Ph p 0 1 ft 0 G 0 0 B * TO TO G O ft B ft bC bQ-P 0 0 ft 0 ft P P 0 B ft rH C G ft G p O G P 3 G H ft 0 0 O O ft ft O rH CO 0 C -P C *H B O G O G CA 0 3 3 c 0 G G 0 G P O 0 P 0 G ft H Ph TO TO G g TO ft P 0 g rH c 0 0 1 ft 0 G 0 O G H a a g 0 0 0 0 O G * TO c 0 g G a) ft ft 0 c ft rH s

26、i SI s O C ra P ft 0 0 s B B P 0 G P 0 g p 0 TO 0 O rH ft p 0 XI 00 p 0 O 0 ft 0 0 ft * B P P G 11 WC -p O B ft B 0 ft T5 0 0 O bO * 0 C ft ft ft 0 0 B B p G G ft -H C G G 0 0 P p P 0 0 G Eh G 0 0 TO C 11 G Ph *H 0 0 B ftP C ft O ft G 0 G 0 O p ri P S Eh 0 G 0 G G 0 C 0 O 0 G 0 0 0 P O 0 0 Td C G S

27、g .a C 1 0 G 31 cd 0 ft P 1j ft -11 0 A 0 D S a* H 0 rv ft TO c c 0 G TO Oft 0 “ 0 P 0 B 0 0 c B O ft O P 0 G ft 0 0 0 3 11 0 ft 0 0 ft ft ftp TO TO C J -P -HCO 0 H 0 ft G G P* 0 ft c 0 0 1 G ft CA to ft ft 0 C TO G 0 0 0 ft ft S ft 0 to g p 0 p 0 ft 0 0 HO 0 G p C *H G E 0 0 O si Ph 0 G bO X 0 P O

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29、 0 *s 08 0 E SI G 0 bO 0 i 1 33 0s 0 0 G p G 1 3 T-S ft 11 H CO ft p G 1/1 CA TO A G 0 OP bO 11 0 G ft m G * ft O g hO ae: O rH ft rH ft O O z ft B X O z fH i! ft cA aTaj G G 3 t 0 0 O 0 O 0 0 0 0 ft G 0 J i-G ft O ft O A | rH O 0 ft ft 0 j ft 0 O G O 0 0 0 EH F O O 0 A 0 0 5 O fa 0 1 O G O O G 0 s

30、1 5 0 ft ft ft CO (ft O 0 G O O G 0 sO rH O HOC O *H O C * A ft ft P O ftp 0 0 B 0 B tsl SI ft P ft p B G B 0 S) G G 0 SI G G O X 0 S B TO O ft B TO O ft 1A ft 0 0 3 O ft 3 0 ft e Ph Ph C O 2 0 0 O Ph ft O bOP P g i O 0 0 CO 0 w 0 cA P cS g n e G CO CO CO FREQ. g SI B S 0 0 SI B S O O H S 0 O O 0 0

31、H ft CO 00 ft O oe z LU si z B 3 a t 0 0 S * WO O O O O g 0 O O 11 11 CO CO 11 a. LU CM CO m _ 1i cd Cd C C pH Ph 0 0 -p -p c c *H H 0 o 0 1A g c o cd BO -P 1A 1I Ph 0 ft B O -P O G o 0 -p cd 0 B ft 0 0 0 Ph O Ph O -P cd cd Ph 0 0 C 0 0 G to H 0 fn cd o o G G -P bO cd cd H TO Ph 0 0 0 ft C ft g 0 H

32、*H bO o * * REPLACEMENT PARTS 070-003 All parts not listed are common items obtain able from radio parts jobbers. Replacement parts may be obtained when ordered by PART NUMBER from: McIntosh Laboratory Inc. Customer Service Department 2 Chambers Street Binghamton, New York 13903 (telephone 607-723-3

33、512) CAPACITORS Symbol Number Desc ription Part Number C56 Mylar . 22pF 250V 064-068 C58,59 El ect. lOOpF 15V 066-127 C101 Mylar . 22 pF 250V 064-068 Cl 07 El ect. lOOpF 15V 066-127 Cl 1 1 Mylar 1 pF 250V 064-067 Cl 1 3 Mylar . 22 pF 250V 064-068 Cl 27 El ect. lOOpF 15V 066-127 C201 E1 ec t. lOOpF 2

34、5V 066-124 C202 Mylar . 22pF 250V 064-068 C204 El ect. 200/200pF 100V 066-129 C205,206 Mylar . 22pF 250V 064-068 C207 Mylar . 47 pF 250V 064-069 C208.209 El ect. lOOpF 15V 066-127 C210 Elect. 50/200/300/1 50pF 200/150/50/50V 066-218 C301,302 Mylar 47pF 250V 064-069 C305.306 Elect. lOpF 20V 066-149 C

35、307.308 Elect. lOpF 20V 066-149 C315,316 El ect. lOOpF 15 V 066-127 C317,318 Mylar 47pF 250V 064-069 C319.320 Mylar . 22pF 200V 064-087 C323.324 Mylar .047pF 250V 064-066 C325.326 Mylar 47pF 250V 064-069 C327 Mylar 47pF 250 V 064-069 C329.330 Mylar .047 pF 250V 064-066 C331,332 Mylar .022pF 250V 064

36、-065 C337.338 Mylar 1 pF 250V 064-067 C339.340 Mylar .47pF 250V 064-069 C341,342 Mylar .047pF 250V 064-066 C343.344 My 1 a r .47pF 250V 064-069 DIODES D1 ,2 Si. signal d i ode 070-022 D3,4 Si. signal d i ode 070-022 D5 Ge. signal diode 070-003 D6,7 Si. signa1 diode 070-022 D101,102 Si. signal diode

37、070-022 D103 Si. signal diode 070-022 D104 Ge. si gnal diode 070-003 D105,106 Ge. signal diode 070-003 D107 Ge. signal diode 070-003 D108 Bias diode 070-046 D201 Zener diode 16V 070-042 0202,203 Si. rectifier 070-031 D205.206 Si. rectifier 070-031 0207 Zener diode 75V 070-025 FUSE F201 Fuse .5 amp S

38、lo-blo 089-020 CHOKES LI Choke 1.2pH 122-01 1 L2 FM antenna coi1 122-069 L3 FM RF coil 122-070 L4 FM mixer coi1 122-071 L5 FM local oscillator coil 122-072 L6 AM loop antenna 122-074 L7 AM antenna coi1 122-073 L1 0 Choke 75pH 122-013 L1 2 AM osci11ator coi1 122-066 L1 3 Choke 1OOmH 122-004 L1 4 Chok

39、e 1.2pH 122-01 1 L1 01 Choke ImH 122-065 L1 02 Filter coil (19kHz phase) 122-067 LI 03,104 Fi1 ter coi1 (lo pass) 122-015 L1 05 Filter coil (SCA adjust) 122-068 TRANSIST0RS Ql Si. j unction F.E.T. 132-049 Q2,3 Si. j unction F.E.T. 132-049 Q4 M.O.S. F.E.T. 132-064 Q5,6 S i . NPN t ransistor 132-015 Q

40、7 Si. j unction F.E.T. 132-049 Q8 M.O.S. F.E.T. 132-064 09,10 M.O.S. F.E.T. 132-061 Ql 1 S i . NPN transistor 132-041 Ql 01 Si. NPN transistor 132-057 Ql 02 Si . NPN transistor 132-052 Ql 03 S i . NPN t ransistor 132-041 Q104,105 Si. NPN transistor MX 132-057 Qi 06 Si. NPN transistor 132-042 Q201 S

41、i . NPN t ransistor 132-072 Q202 S i . NPN t ransistor 132-516 Q203 Si. NPN t ransistor 132-069 Q301,302 Si. PNP transistor 132-056 Q303,304 Si. PNP t ransistor 132-056 Q305,306 Si. NPN t ransistor 132-069 Q307,308 Si. NPN transistor 132-054 Q309.310 Si. PNP transistor 132-056 Q311,312 S i . NPN t r

42、ansistor 132-054 Q313,314 Si. NPN t rans i stor 132-057 Q315,316 S i . NPN t ransistor 132-042 POTENTIOMETERS R49 AM 1 eve 1 134-177 R1 05 Muting adj ust 134-216 R107 FM level 134-197 R335 Volume control 134-202 R356 Balance control 134-201 R377.378 Tone control 134-203 RESISTORS R2 1 9 Wi rewound 2

43、.On 5W 139-005 R220 Wi rewound 2.7n 1W 139-002 R22 1 Wi rewound 1.2fl 1W 139-001 SWITCHES SI AM sensitivity 148-023 S202 Dial sea 1e intensity 148-023 S301 Input selector 146-125 S302 Pushbutton 1 50-004 S303 Phase 148-023 TRANSFORMERS T1 Ba 1 un 043-226 T2 FM IF transformer 162-034 T3 FM 1F transfo

44、rmer 162-035 T4 FM IF transformer 162-034 T5 FM IF transformer 162-035 T6 FM discriminator 162-036 T7,8 AM IF transformer 162-038 T9 AM IF transformer 162-038 T1 0 AM RF transformer 162-033 T101 RF transformer (19kHz) 162-031 T1 02 RF transformer (38kHz) 162-039 T201 Power transformer TUBES 043-865

45、VI 6HU6 INTEGRATED CIRCUITS 165-025 IC1 ,2 Integrated circuit MODULES 133-001 Tone control module LAMPS 130-027 #1828 (MPX lamp) 058-027 #1 866 (front panel) 058-014 Festoon lamp (dial glass) FRONT PANEL & TRIM 058-032 Front panel 043-920 Front panel end caps 018-120 Tuning knob 043-272 Volume contr

46、ol knob 043-253 Balance knob 043-253 Input selector knob 043-253 Bass knob (rear) 090-009 Bass knob (front) 043-625 Treble knob (rear) 090-009 Treble knob (front) 043-625 Muting knob MOUNTING SYSTEM 090-010 Shelf bracket (right) , 043-592 Shelf bracket (left) 043-593 Mounting template #100 038-179 Hardware package MISCELLANEOUS ITEMS 043-446 FM dipole antenna