McIntosh MX115 Tuner-Preamp Service Information.pdf

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1、SERVICE INFORMATION STARTING WITH SERIAL NO. AB1 001 r McIntosh laboratory inc. 2 chambers street binghamton, new york MX 115 MX 115 ELECTRICAL SPECIFICATIONS FM TUNER SECT ION USEABLE SENSITIVITY SELECT IV ITY 2.5 microvolts at 100% modulation (+75 kHz deviation) for 3% total noise and harmonic dis

2、tortion IHF. ADJACENT CHANNEL: 6 dB minimum IHF in NORMAL Position. 15 dB minimum IHF in NARROW Position. S IGNAL TO NO ISE RAT 10 ALTERNATE CHANNEL: 70 dB below 100% modulation. 58 dB minimum IHF in NORMAL Position. 88 dB minimum IHF in NARROW Position. CAPTURE RAT 10 1.5 dB minimum. HARMONIC DISTO

3、RTION Mono: Does not exceed 0.3% at 100% modulation +75 kHz deviation. Stereo: Does not exceed 0.7%. SPURIOUS REJECTION 90 dB IHF minimum. IMAGE REJECTION 95 dB minimum, 88 MHz - 108 MHz. STEREO SEPARAT ION AUDIO FREQUENCY RESPONSE 35 dB at 1,000 Hz. +3 dB 20 Hz to 15,000 Hz with standard de-emphasi

4、s (75 psec.) and 19,000 Hz pilot filter. SCA FILTER 50 dB rejection from 67 kHz to 7A kHz. 275 dB per octave slope. PREAMPL FIER SECTION FREQUENCY RESPONSE +0.5 dB, 20 Hz to 20,000 Hz. DISTORT ION Less than 0.1% at 2.5 volts 20Hz to 20 kHz. INPUT SENSITIVITY (phono 1 and phono 2) 2 millivolts for 2.

5、5 volts output at 1 kHz. INPUT SENSITIVITY (aux, tape) 0.25 volts for 2.5 volts output. HUM AND NOISE (phono 1 and phono 2) 72 dB below 10 millivolt input. HUM AND NOISE (aux, tape) 85 dB below rated output. OUTPUT (main) 2.5 volts with rated input. Up to 10 volts can be developed without distor tio

6、n. 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. FM and AM will produce 1.2 volts output at 100% modulation. OUTPUT (center channel) 2 volts with rated input to both channels.

7、 BASS CONTROL -18 dB to +16 dB at 20 Hz. TREBLE CONTROL +20 dB to 20,000 Hz. LF FILTER Flat or roll off below 50 Hz, down 12 dB at 20 Hz. HF FILTER Flat or roll off above 5000 Hz, down 12 dB at 20,000 Hz. TAPE OUTPUT MX 115 MPX PRINTED CIRCUIT BOARD 044-291 Step 1 Before stringing unit, turn pointer

8、 adjustment screw until pulley A is in the center of its travel. Step 2 String unit as shown. Step 3 After stringing 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. TUNIN

9、G CONDENSER DRUM Step lj. Turn the tuning knob making the pointer move back and forth from one end of the dial scale to the other. Return pointer to the far left DIAL CORD SEQUENCE POINTER DIAL STRINGING BLACK (TO TUNING SHAFT ) 100 K MX 115 MX 115 SCHEMATIC NOTES Unless otherwise specified: Resista

10、nce values are in ohms, 1/1+ watt, and 10% tolerance; capacitance values smaller than 1 are in microfarads (pF); capacitance values greater 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

11、numbers around the dotted lines correspond to the numbers on the PC Board layouts. The heavy lines on the schematics denote the primary signal path. The terminal numbering of rotary switches is for reference only. All .voltages indicated on the schematics are measured under the following conditions:

12、 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 120 volts, 50/60 Hz. e. Front panel controls at: Tuning indicator 100 MHz (no signal) Volume Fully CCW Mode Stereo Muting Out Input Selector F

13、M Panel Lights Bright Selectivity Out f. Voltages shown in rectangles are measured with selectivity switch in the In position. IF CHASSIS IF PC BOARD 044-277 fn FM TUNER SECTION MX 115 154-516 /via try LEFT CHANNEL INPUTS PHONO 2 PHONO I AUX. TAPE OUT RIGHT CHANNEL INPUTS PHONO 2 PHONO 1 TAPE AUX. T

14、APE OUT LEFT CHANNEL PREAMP. PRINTED CIRCUIT BOARD 043-991 ttimaa RIGHT CHANNEL PREAMP. PRINTED CIRCUIT BOARD 043-992 POWER SUPPLY / CENTER CHANNEL PRINTED CIRCUIT BOARD 044-296 MX 115 T40I L403 MX 115 MX 115 re, nuMirua X 115 O LU Cm O LU cm LU Q_ O LU X C X cr 0 O X c 3 x fD x o x 4_l fD o 00 cr 0

15、 C CO CD X o 3 U X x u cr fD X O i- 0 0 CL x* O O 1 1 o - c fD x 4 4-4 CO LA O X o X 0 CO CO CO U lO 0 X X fO CO . 0 CO Li_ x o 5 f= X U CNJ 0 0 c X fD 1 X CJ E 41 - r- X x 0 0 CNJ X x X 0 X E x fD fD 0 - 3 O O X x N x 1/1 X C 0 U - 0 0 X (D 0 M- fD . X 0 0 E D CL 0 X CC 0 0) x I C CL - C X Q. X 0 C

16、D - X 0 X X CO 1/1 0 c 2 o O 0 L . o CO 4-J X CL 0 o 2 0 - 0 c o co * 0 4-1 4J 0 0 C 0 f/1 C LA CO !2 CO 2: x -. 0 CL 0 - - Ll 0 CO o Q r + 1 cn N c QC w r X 0 X X o X C71 O * CL O 2: c 0 21 I c 3 21 C c r O cr l/) X 21 X -C j-. x r-v E 0 U u o 0 u L 21 0 1 3 0 O X o f/1 0 x o Ll. | X 1 0 o X O . .

17、# # . , CNJ CO -J- LA X r. 00 x 0 0 X X C x 0 3 0 X X c X f O 4-) 0 X C cnx X o C =5 CL C X f/1 cn 0 3 L. E . i_ - 0 0 O 1 x 0 X O 4-J x C 4-* U X o 0 0 X 0 oo 4- 0 E 0 0 z 0 o X X CL X i 0 E y X 5 1- o o C_y i X C 0 cn oo to 3 X z 0 X 2 4-J - O X 0 J X f/1 E 0 C o - X LA Z 0X1- X LU c O in X X 0 U

18、U X -LX Z c X 0 cn 0 21 o cn x c x i U 0 0 U X J 0 X 0 X x 1-11- un E 0 O x O in x 3 C L X 0 X i_ 0 0 X 0 E O O L_ x CLX C 3 3g 00 -00 U 3 CL c E 0 cr CL O X u 0 0 o o l- X XXI- 0 X f/1 0 x CL f/1 X 0 f/1 0 C 0 CLX i- X 0 CL C 0 X OX0 c 0 2 x cn 0 C X O in x f/1 c O 0 0 0 X 0X0 X 0 X L C 0 u X in .

19、0 X X u X X 2: to 1-3 3 0 u 0 U U C 0 X X 1_ CL X X l/l - 4-j TO X X 0 0 O 21 x X X X CL 0 c E x 0 0 O 0 X X c u X 0 cn 0 I CNJ -q . c 0 X LA 0 0 _Q in ca O i - - X X CA u O C CNJ x 0 c r- 0 x O 1 Q_ 3 02a. O U o x U 3 CL 0 O X X C 0 O 0 in 0 c X X E 0 X xxx C x CL X O 0 0 0 0 X E Q-* X in C 0 0 CL

20、in to cnci x 2: 0 0 . i O X 0 21 0 0 0 O CA Ll c O 0 - CT in L- 0 x rA 0 X - X CO 0 - 0 Xf X X X XL X c u 0 O O 0 0 0 E - . 1_ O cn 0 0 x2 c TO in 0 X 3 x 2 0 O o O crx c . 0 x c . 1 m u O o in . 0 X X x x E 2 X c 0 0 cox X 1- X 0 o cn X O C E c 0 CL c E TO cm TO C 0 O 0 cn in C “ 0 x 3 0 X X c m .

21、0 0 o 0 X x E 0 X C in x x 0 0 0 O x 0 xx E X X CO X C X Q_ c 0 - in X E X 3 X X 0.0 7 00 3 0 in 0 x O 3 X m c E X crux 0 O 0 in 0 0 m U x X 0 0X0 X X 3 X c C in u X CNJ 0 0 U 0 0 X E X 0 x X 0 c X X cn 0 0 X u XXX x O c r 1 x o Lx 0 I OOMHz 100MHz Same 1 kHz (100/ AC-VTVM L or R output Loss than Ad

22、just FM-Level control (R409) tor 1.2 volts modulation) jack. 12mV of of audio output at fixed output jacks. Then, L or R only, residual. turn off the modulation and measure the resicual pilot on. b1 the 19kHz and 38kHz frequencies. THESE LEADS MUST BE VERY SHORT REPLACEMENT PARTS All parts able from

23、 not listed are common radio parts jobbers. iterns obtain- Replacement parts may be obtained when by PART NUMBER from: ordered McIntosh Laboratory, Inc. Customer Service Department 2 Chambers Street Binghamton, New York 13903 (telephone 607-723-3512) CAPAC IT0RS Symbo1 Number Description Part Number

24、 Cl 09 Ta. Elect. 22pF 20 V 066-148 C 202 Mylar . 22pF 250V 064-068 0204 Elect. 200/200pF 100V 066-129 0205,206 My 1 ar . 22pF 250V 064-068 C207 Mylar 47pF 250V 064-069 C208,209 Elect. 1 OOpF 16V 066-177 C 2 1 0 E1 ect . 50/200/300/1 50pF 200/150/50/50V 066-128 C301,302 Mylar .47pF 250V 064-069 0305

25、,306 Ta. Elect. 1 Op F 20 V 066-149 C 307,308 Ta. Elect. 1 Op F 20V 066-149 C 31 5,31 6 El ect. 1 OOpF 15V 066-127 C317,318 Myl ar . 47pF 250 V 064-069 0319,320 My 1 ar . 22pF 200V 064-087 C 321,322 Polyp ropy 1 ene .0068|jF 064-103 0323,324 Myl ar .047pF 250V 064-066 0325,326 Myl ar .47pF 250 V 064

26、-069 C327 Myl ar 47pF 250V 064-069 0329,330 Mylar .047pF 250V 064-066 0331,332 Mylar . 022p F 2 50V 064-065 0337,338 Mylar .lpF 2 50 V 064-067 0339,340 Mylar 47pF 250 V 064-069 0341,342 Mylar .047pF 250V 064-066 0343,344 Mylar .47pF 250 V 064-069 C401 Mylar . 22pF 250V 064-068 0405 El ect. lOOpF 25V

27、 066-161 0408 E1 ect. lOOpF 25 V 066-161 041 1 Ta. El ect. 1 . Op F 35V 066-147 0415 Myl ar . 22pF 250V 064-068 DIODES D1 Ge. signal d i ode 070-003 D2,3 Si. diode 070-022 D101,102 Si. diode 070-022 D103,104 Ge. signal diode 070-003 D10 5,106 ,Ge. signal diode 070-003 D107,108 Si. diode 070-022 D201

28、 Zener diode 24V 070-049 0202,203 Si. diode 070-031 D205 Si. diode 070-031 D206 Si. diode 070-031 D207 Zener diode 75V 070-025 D402.403 Si. diode 070-022 D404 Si. diode 070-022 D405.406 Ge. signal diode 070-003 D407,408 Ge. signal diode 070-003 D409 Ge. signa1 diode CHOKES COILS 070-003 LI 1st RF co

29、il 122-115 L2 2nd RF coil 122-114 L3 Mixer coil 122-113 L4 Osci11ator co i 1 122-112 L1 01,102 Choke 75pH 1 22-013 L 401 Choke 1MH 122-092 L402 Fi1 ter coil (19kHz) 122-080 L403.404 Filter coil (SCA) TRANSISTORS 122-079 Q1 ,2 Si. M.0.S. F.E.T. 132-088 Q3 Si. NPN transistor 1 32-01 5 Q4 Si. Junetion

30、F.E.T. 132-084 Q5 Si. Junction F.E.T. 132-068 Q6 Si. M.O.S. F.E.T. 132-086 Q20 1 Si. NPN transistor 132-065 Q202 Si. NPN transistor 132-028 Q203 Si. NPN t ransistor 132-069 Q301,302 Si. PNP transistor 132-056 Q303.304 Si. PNP t ransistor I32-056 Q305.306 Si. NPN transistor 132-069 Q307.308 Si. NPN t

31、ransistor 132-054 Q309.310 Si. PNP transistor 132-056 Q311,312 Si. NPN transistor 1 32-054 Q313,314 Si. NPN transistor 132-057 Q315.316 Si. NPN t ransistor 1 32-042 Q401 Si. NPN transistor 132-057 Q402 Si. NPN transistor 1 32-090 Q403,404 Si. NPN transistor 132-057 Q405 Si. NPN transistor 132-057 Q4

32、o6 Si. NPN t ransistor 132-042 .Ge. signal diode Si. diode 070-003 F201 FUSES MX D105,106 D107,108 Si . d i ode 070-022 D201 Zener diode 24V 070-049 D202,203 Si . d i ode 070-031 D205 Si . d i ode 070-031 D206 Si . d i ode 070-031 D207 Zener diode 75V 070-025 D402.403 Si . d i ode 070-022 0404 Si .

33、d i ode 070-022 D405.406 Ge. signal diode 070-003 D407.408 Ge. signal diode 070-003 D409 Ge. signal diode 070-003 CHOKES & COILS LI 1 St RF coil 122-115 L2 2nd RF coil 122-114 L3 Mixer coil 122-113 L4 Osc 11ator coi 1 122-112 L101,102 Choke 75mH 122-013 L401 Choke 1MH 122-092 L402 Fi1 ter coil (19kH

34、z) 122-080 L403.404 Filter coil (SCA) 122-079 TRANSISTORS Q1 ,2 Si . M.O.S. F.E.T. 132-088 Q3 Si . NPN transistor 132-015 Q4 Si . Junction F.E.T. 132-084 Q5 Si . Junction F.E.T. 132-068 Q6 Si . M.O.S. F.E.T. 132-086 Q201 Si . NPN transistor 132-065 Q202 Si . NPN transistor 132-028 Q203 Si . NPN tran

35、sistor 1 32-069 Q301.302 Si . PNP transistor 132-056 Q303.304 Si . PNP transistor 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 Si . NPN transistor 1 32-054 Q 31 3,314 Si . NPN transistor 132-057 Q315.316 Si . NPN t r

36、ansistor 132-042 Q401 S i . NPN t ransistor 132-057 Q402 Si . NPN transistor 1 32-090 Q403,404 Si . NPN transistor 132-057 Q405 Si . NPN transistor 132-057 Q406 Si . NPN transistor 1 32-042 F201 Fuse ,5A slo-blo 089-020 POTENTI0METERS R335 Volume control 134-202 R356 Loudness/Ba1ance control 134-236

37、 R377 Bass control 134-203 R378 T reb1e cont ro1 134-203 R407 Muting control 134-216 RESISTORS R2 1 9 Wi rewound 2ft 5W 139-005 R220 Wirewound 2.7ft 1W 139-002 R225 Wirewound 2ft 5W 139-005 SW ITCHES S301 Input selector switch 146-130 S302 Mode selector switch 150-004 S304 Loudness/Balance control 1

38、34-236 TRANSFORMERS T1 Ba I un 043-226 T 2 FM IF transformer 162-059 T3 FM IF transformer 162-042 T1 01 FM 1F fi1 ter input 162-053 T1 02 FM IF filter output 162-052 T103 FM IF filter input 162-053 T1 04 FM IF filter output 162-052 T105 FM discriminator 162-036 T201 Power transformer 043-865 T401 FM

39、 RF transformer (19kHz) 162-031 T402 FM RF transformer (38kHz) 162-039 MODULES Tone control module 130-027 LDR network 144-013 METERS MI 01 Tuning meter 124-005 INTEGRATED C IRCUIT IC101,102 1 nteg rated circuit 133-002 FILTERS FN1 FM filter 180-009 LAMPS #1847 (Meter) 058-008 #1866 (Front Panel) 05

40、8-014 MX 115 #1828 (MPX) 058-027 Festoon lamp 058-032 FRONT PANEL & TR |M Front panel 044-297 Front panel end caps 018-120 Vo 1ume knob 043-253 Input selector knob 043-253 Tuning knob 043-272 Bass knob (rear) 090-009 Bass knob (front) 043-625 Treble knob (rear) 090-009 Treble knob (front) 043-625 Lo

41、udness knob 043-625 Balance knob 090-009 Level set knob 090-010 MOUNTING SYSTEM Shelf bracket (right) 043-622 Shelf bracket (left) 043-623 Mounting template #100 038-179 Flardware package 043-446 MISCELLANEOUS ITEMS Plastic feet 017-041 Tuning shaft 021-067 Shipping carton 044-365 Push terminal (antenna) 074-032 Owners manual 038-528 Dial cord 044-226 Dial pointer 043-876 Shorting p1ug 127-021 AC line cord 170-021 FM dipole antenna 170-033 Fuseholder 178-001 Dial glass 044-366 MX 115 SCHEMATIC PART NO. 038-529