McIntosh MX114 Tuner-Preamp Service Information.pdf

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1、ffltlntosb MX 114 SERVICE INFORMATION STARTING WITH SERIAL NO. 10V01 f McIntosh laboratory inc. 2 chambers street binghamton, new york MX 114 MX 114 ELECTRICAL SPECIFICATIONS TUNER SECTION USABLE SENSITIVITY CAPTURE RATIO Better than 2.5pV (IHF usable sensiti- Better than 1.5dB vity) SIGNAL TO NOISE

2、 RATIO Better than 65dB SPURIOUS REJECTION 90dB or greater HARMONIC BISTORTION Mono, less than 0.5%. Stereo, leas than 0.8%. IMAGE REJECTION 75dB or greater (at 100MHz) STEREO SEPARATION FREQUENCY RESPONSE Better than 30dB at 1kHz Flat from 20Hz to 20kHz with standard de-emphasis and 19kHz pilot fil

3、ter PREAMPLIFIER SECTION FREQUENCY RESPONSE +0.5dB, 20Hz to 20,000Hz DISTORTION Less than 0.1$ at 2.5 volts 20Hz to 20kHz INPUT SENSITIVITY (phono 1 and phono 2) 2 millivolts for 2.5 volts output at 1kHz INPUT SENSITIVITY (aux, tape) 0.25 volts for 2.5 volts output HUM AND NOISE (phono 1 and phono 2

4、) 72dB below 10 millivolt input HUM AND NOISE (aux, tape) 85dB below rated output OUTPUT (main) 2.5 volts with rated input. Up to 10 volts can be developed without distor tion. FM will produce up to 10 volts output at 100$ modulation. OUTPUT (tape) 0.25 volts with rated input. Phono input signal of

5、10 millivolts produces 1.2 volts output. FM will produce 1 volt out put at 100$ modulation. OUTPUT (center channel) 2 volts with rated input to both channels BASS CONTROL -l8dB to +l6dB at 20Hz TREBLE CONTROL +20dB to 20,000Hz LF FILTER Flat or roll off below 50hz, down 12dB at 20Hz HF FILTER Flat o

6、r roll off above 5000Hz, down 12dB at 20,000Hz TUNER SECTION MX 114 PREAMPLIFIER SECTION POINTER DRIVE TUNING CONDENSER DRUM POINTER ADJUSTMENT SCREW jr Before stringing unit, turn pointer adjustment screw until pulley A is in the center of its travel. String unit as shown. After stringing unit, tur

7、n 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. 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

8、left and, if necessary, re adjust pointer position. TUNING CONDENSER DRUM TUNING CONDENSER DRIVE BLACK DIAL CORD DIAL CORD SEQUENCE (TO LEFT SIDE PULLEY B) WHITE I 1 =S (TO IDLER PULLEY AND TUNING SHAFT) BLACK i 3 WHITE (TO RIGHT SIDE PULLEY A ) . BLACK (TO TUNING SHAFT) TUNING CONDENSER DRUM POINTE

9、R DIAL STRINGING COAX RF CHASSIS l i i l L2 SCHEMATIC NOTES Unless otherwise specified: Resistance values are in ohms, 1/4 watt, and 10$ tolerance; capacitance values smaller than 1 are in microfarads (m-F) ; capacitance values greater than 1 are in picofarads (pF); inductors are in microhenries (p.

10、H), 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 signal path. The terminal numbering of rotary switches if for ref

11、erence 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 ground. c. No signal at input or antenna terminals, d. AC input at 117 volts, 50/60Hz. Front panel controls at

12、: Tuning indicator 100MHz (no signal) Volume Fully CCW Mode Stereo Muting Out Input Selector FM Panel Lights Bright LEFT CHANNEL INPUTS | PHONO 2 i I PHONO I i TAPE AUX. TAPE OUT RIGHT CHANNEL* INPUTS PHONO I TAPE AUX. TAPE OUT INPUT SELECTOR MX 114 MX 114 LEFT CHANNEL PREAMP. PRINTED CIRCUIT BOARD

13、RIGHT CHANNEL PREAMP. PRINTED CIRCUIT BOARD MX 114 PRINTED CIRCUIT BOARD 043-007 POWER SUPPLY / CENTER CHANNEL SECTION MX 114 154-358 MX 114 MX 114 MUTING o LU Q o LU Q -p c r 0 TJ i( 0 P cd rH c r% i1 0 rH p O 11 Td G G G cd G o4 0 P cd 0 C H cd o G o G o a4 cd o rl 0 Ph G rH 1 CO o4 cd G p CO 0 p

14、o p r1 CO 0 G CQ rH co O G o -P a CJ 0 G 1 X 0 i1 1A rH T3 0 i 2 G G G X cd cd 0 G s G CO m 0 o cd 32 Gh cd rH 0 O 0 P-4 cd s X G 1 G ft p 0 cd G G 0 p 0 0 G 0 CO *rl cG ci 0 ft H G O o Q a4 i1 X o 0 cd 0 CO a C 11 |rj O h G bU ft rH c o rH rH O oa s P r- H e 11 O G CA S G o CO cd CA k s rH o K n rH

15、 CJ rA -d- LA vO p CO 1 0 cd G u G 0 -d- e i1 o r-H *rl p xj cd S G rl 11 cd o 0 G G 2 0 Gh ft G O G G G o o uo P ft rH G o o o ft cd O cd G Gh *h p 0 p O 0 0 0 0 -P rG I 0 h rH i1 P 2 P ft P cd G O ZD P G O cd p P 0 H O OT k cd 0 CO OT TJ 0 0 0 0 Tf T3 O P z 0 H rH 0 cd P H 0 bO G H CO *rl 0 0 s OT

16、 G p !s O rH z CO Cd rH LU TJ G e H s G 0 2 j- P P cd C P rH C G rl CO rH 0 0 o Td p P H G 0 - G T3 u bO co G rG rH H 0 P 0 H G rG rH O O G G CO rH rH S -P 0 O P *rl H o co Gh H x G rl cd Gh H Gh G 0 0 G P s 0 cd t3 nv o P C B 0 *rH G ft 0 0 G bD ft o a4 CO 2 H *rH rH Q) j 0 OT w G H G CO P G o cd Q

17、4 o P o c 0 Gh 0 0 cd OT P 0 0 P G G 0 C rH rG X OT PGP H 2 G 0 P p OT O o cd rH *rl 0 O 0 Shot G G G P cd ,G *H C 0 o o p H cd o P G G 0 0 rH t *rl Gh h *h ,G rG Gh d cd p J o o B B o P ! bO GO *H Gh O i M CM A 1 g a : 03 -P ft 5 G O S G TJ : A H I J O G 03 -P O ! JO ft ffl *i fti 3 4 ; ft 3 A - J

18、i j rdlAH .-l -P Eh -P ft O r A O *A ) GO o O 4 1 O G 01 G i 3 TJ aJ G ft ,G i * TJ CM 3 O ft -h 3 TJ TJ ft j r 1 a a Aft 3 3 ! H ,03! 2 ft A 01 r 0-P Eh n -P 3 5 lr|3: -P X ft G ) -P 03 O 4-3 Or O 3 CM OW *_jCM TJ : TJ g i 3 G 3 ft : o o o 4 5 G TJ r 3 G iH 1 * -P G *H ft | ) ft G 3 I 1-1X3 3 3 ft

19、ft ft OIA 3 w ff! S 1I t- 0 S ft 3 ft T bO ft ft 3 ft 3 ft X bO Ph Eh TJ P 3 O ft A POP 3 TJ G O G POO O O ft TJ G 3 G ft 3 O O O O K bO C ft 1 1 ft 3 3 O ft X G G P G O G v4 3 O S 5 OP G * ft O G ft G !ft 3 G 3 G 1I ft H 3 TJ TJ 3 3 ft ft S ft 3 Eh 3 S G O G Aft HP (D - CO H O rG * P OPH G G H 3 Eh

20、 3 G C G O - bOft O o ft 3 ft W 3 P TJ ft t-5 G G o P TJ O 3 3 3 3 P 1I * 3 ft 3 sO A G TJ *H ft ft ft G TJ 3 3 ft ft O P G 3 P ft 3 ft O o ft ft 3 P G P 3 O G ft 3 P O - ftP ft bO G ft G 1A 0 ft ft ft O Aft N 3 TJ ft O ft ft G 3 G * ft G MD G | g I X g ft ft ft ft ft G G G ft S ft 3 ft O 3 bC. G C

21、J ft C ft ft 3 G-ft P 3 ft CP G 3 ft bO * TJ ft 3 ft G O ft CM S 3 o ft 3 Oft 1511 ft ft TJ 3 TJ 5 G P ft FQ ft o TJ G 3 CM O ft TJ P P 3 P ft G 3 G ft G i O ft ft bO G O ft ft G G 3 P 3 G LA ft P 3 0 G ft o o P co bO P P G P 3 Sftft 3 A 3 P ftp-n P 3 C 3 TJ co S ft o 3 s i 3 3 CO CO 3 P 3 C 3 P 3 f

22、t -p O P 3 P 3 G 3 ft O O ft (ft O ft 3 TJ G P W C O G bOA TJ O G ft I G P O 3 G ft ft O G TJ O 4 O 03 ft p P TJ 3 P o G G G G G O G P G N TJ P O j c G ft O ft 3 3 TJ O P ft Eh tj P 3 O p ft pop 3 TJ C O C POO O O ft TJ C 3 C ft 3 , o o o o ft TJ P 0) ft G ft C 3 G o 3 c G 3 P 1I P 1I ft ft o 3 3 G

23、ft! O M3P G h o w S ft) ft fe 0 e p ft 3 ft isVLA A P G 3 ft CM ft ft * HD 0 G +3 Pi ft -p cd i Cm 0 G cd o X! TD TD d O P XI ft N -P bO bO-P w cd H 0 Cm P -P CO 53 H c P H 3 -P O G -p Pi *H ft 0 0 O O rH ft o H CO CO G P G *H ft O O G rO 0 G G p ft CO Pi P g O G -p o cd -p 0 G H p P HD HD 3 1 -o rH

24、 -P Cd H P o 0 1 11 O cd o P HD c CD g C & H O *H 0hd0 C 0 11 rH -P 0ft 0 o -p o O 0 ft -P Pi *H 0 Cd H ft -p -p U rH CM ft -P oxl H PX 0 ft HD cd 0 O bfl cd CP p. P 0 0) ft i-p c P rH *H P 0 0 -p -p -P cd O G H Pi 0 0 v-o c rH ft Pi *H CO aS X ft+J C-H OP d O 2 O 0 -P X-P SEH C cl d 3 ca c rj CO CO

25、 bOH o w 3 00 0 +3000 HD P 3 e s -x 1 0 0 O ii -P T-J.H -H 0(J O CD g cf H (D HD 0 0ft cMr0GG0P:terO Oft 0 CO -P (D ft 0 0 o H *H 00 EH P = p G ft i1 r1 Cd -p cd cd o i1 cd G P 0 G ft 0 O Xd r-3 O O -P cd p ft cd T3 S i1 cd rH 0 CO rH ft ft-P HD HD P ft p *HCO cd H CO H p, P -P - 0 Cm 0 o 1 dPcO N f

26、t T3 G 0 0 0 ft -H 2 ft cO ft P H HD 0- p 0 0 P O 0 ,0 0 3 p d -h 3 e o 0 O S N IA ft p P O -P 0bOW0PO0 G-h ft 9 HD 0 Xd O -P o -p Pi 0 G cd cd 0 *h i1 *H 0 O 0 *H 3 HftrHg0ft ft G ft O ft Js Q G p o e ft O 0 -g *r-3 ,0 -P 0PH G p ft p P P h ft P. ftp G -p O -p o H G G 0 S Oft O n 0 G P 0 rH ft O 1

27、0 0 0 CO g 0 0 o ft G ft O HD MX 114 REPLACEMENT PARTS 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 (te

28、lephone 607-723-3512) CAPACITORS Symbol Number Description Part Number C58 Elect 100 |xF i5v 066-127 C101 Mylar .22 p.F 250V 064-068 C107 Elect 100 p.F i5v 066-127 cm Mylar 11 250V 064-067 C113 Mylar .22 (xF 25ov 064-068 C127 Elect 100 p.F i5v 066-127 C201 Elect 100 p.F 25V 066-124 C202 Mylar .22 p.

29、F 250V 064-068 C204 Elect 200/200 txF 100V 066-129 0205,206 Mylar .22 p.F 250V 064-068 C207 Mylar 47 txF 250 V 064-069 C208-,209 Elect 100 p.F 15V 066-127 C210 Elect 50/200/300/150 p.F 200/150/50/50V 066-128 C301.302 Mylar 47 250V 064-069 C305,306 Elect 10 |xF 50V 066-048 0307,308 Elect 10 p.F 50V 0

30、66-048 0315,316 Elect 100 p.F i5v 066-127 0317,318 Mylar .47 P-F 250V 064-069 C319,320 Mylar .22 p.F 250V 064-043 0323,324 Mylar .047 M-F 250V 064-066 0325,326 Mylar 47 M-P 250V 064-069 C327 Mylar 47 M-P 25ov 064-069 0329,330 Mylar .047 p-F 25ov 064-066 0331,332 Jlylar .022 p.F 25 ov 064-065 0337,33

31、8 Mylar .1 p-F 250V 064-067 0340 Mylar 47 P-P 250V 064-069 0341,342 Mylar .047 p-F 250V 064-066 C343,344 Mylar 47 txF 250V 064-069 DIODES Dl,2 Si. signal diode 070-022 D3,4 Si. signal diode 070-022 D7 Si. signal diode 070-022 D101,102 Si. signal diode 070-022 D103 Si. signal diode 070-022 0104,105 G

32、e. signal diode 070-003 D106,107 Ge. signal diode 070-003 D108 Bias diode 070-040 D201 Zener diode 16V 070-042 D202,203 Si. rectifier 070-030 D205,206 Si. rectifier 070-031 D207 Zener diode 75V 070-025 FUSE F201 Fuse .5 Amp slo-blo 089-020 CHOKES L2 FM antenna coil 122-069 L3 RF coil 122-070 L4 Mixe

33、r coil 122-071 L5 Local oscillator coil 122-071 L10 Choke 75 pH 122-013 L14 Choke 1.2 pH 122-011 L101 Choke 1 mH 122-065 L102 Filter coil (19 kHz phase) 122-067 L103,104 Filter coil (low pass) 122-015 L105 Filter coil (SCA adjust) 122-068 TRANSISTORS Ql2 Si. junction F.E.T. 132-049 03 Si. junction F

34、.E.T. 132-049 05,6 Si. NPN transistor 132-015 0101 Si. NPN transistor 132-057 0102 Si. NPN transistor 132-052 0103 Si. NPN transistor 132-041 0104,105 Si. NPN transistor 132-057 0106 Si. NPN transistor 132-042 0201 Si. NPN transistor 132-046 0202 Si. NPN transistor 132-516 0203 Si. NPN transistor 13

35、2-026 0301,302 Si. PNP transistor 132-031 0303,304 Si. PNP transistor 132-031 0305,306 Si. NPN transistor 132-026 0307,308 Si. NPN transistor 132-054 0309,310 Si. PNP transistor 132-029 0311,312 Si. NPN transistor 132-054 0313,314 Si. NPN transistor 132-057 0315,316 Si. NPN transistor 132-042 MX 114

36、 POTENTIOMETERS Volume control knob 043-233 R103 Muting adjust 134-203 Balance knob 043-233 R107 PM level 134-197 Input selector knob 043-233 R333 Volume control 134-202 Bass knob (rear) 090-009 R336 Balance control 134-201 Bass knob (front) 043-623 R377.378 Tone control 134-203 Treble knob (rear) 0

37、90-009 RESISTORS Treble knob (front) 043-623 R219 Wirewound 2 St 3W 139-003 MOUNTING SYSTEM R220 Wirewound 2.7 K 1W 139-002 Shelf bracket (right) 043-392 SWITCHES Shelf bracket (left) 043-393 S202 Dial scale intensity 148-023 Mounting template #100 038-179 S301 Input selector 146-130 Hardware packag

38、e 043-448 S302 Pushbutton 130-004 MISCELLANEOUS ITEMS S303 Phase 148-023 FM dipole antenna 170-033 TRANSFORMERS Dial glass 044-019 T1 Baiun 043-226 Pointer 043-876 T2 FM IF Transformer 162-034 Dial cord (complete) 043-891 T3 FM IF Transformer 162-033 Fuseholder 178-001 Tl+ FM IF Transformer 162-034

39、AC power cord 170-021 T5 FM IF Transformer 162-033 Shipping carton 043-988 T6 FM discriminator 162-036 Owners manual 038-318 T101 RF transformer (19kHz 162-031 Plastic feet 017-041 T102 RF transformer (38kHz) 162-039 Push terminal (antenna) 074-032 T201 Power transformer 043-863 Shorting plug 127-00

40、1 Audio cable (6) 170-013 TUBES LDR network 144-013 VI 6HU6 163-023 INTEGRATED CIRCUITS IC1,2 Integrated circuit 133-001 MODULES Tone control module 130-027 LAMPS #1828 (MPX lamp) 038-027 #1866 (Front panel) 038-014 Festoon lamp (dial glass) 038-032 FRONT PANEL & TRIM Front panel 044-006 Front panel end caps 018-120 Tuning knob 043-272 13C03236S-M9319 MX 114 SCHEMATIC PART NO. 038-319