McIntosh MX113 Tuner-Preamp Service Information.pdf

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1、c McIntosh MX 113 AM/FM TUNER PREAMP SERVICE INFORMATION STARTING WITH SERIAL NO. 100H1 r McIntosh laboratory inc. 2 chambers street binghamton, new york MX 113 r MX 113 SENSITIVITY 75pV IHF (external ant.) ELECTRICAL SPECIFICATIONS AM TUNER SECTION SELECTIVITY, ADJACENT CHANNEL 35 dB minimum IHF in

2、 NORMAL Position. 1+5 dB minimum IHF in NARROW Position. SIGNAL TO NOISE RATIO 1+5 dB IHF minimum; 55 dB at 100% modulation. HARMONIC DISTORTION Does not exceed 1% at 30% modulation. IMAGE REJECTION 65 dB minimum 5+0 kHz - 1600 kHz. FREQUENCY RESPONSE 3.5 kHz - 6 dB, NORMAL Position. 2.1 kHz - 6 dB,

3、 NARROW Position. FM TUNER SECT ON USEABLE SENSITIVITY 2.5 microvolts at 100% modulation (+75 kHz deviation) for 3% total noise and harmonic distortion IHF. S IGNAL TO NOISE RAT 10 70 dB below 100% modulation. CAPTURE RAT 10 1 .5 dB HARMONIC DISTORTION Mono: Does not exceed 0.3% at 100% modulation j

4、+75 kHz deviation. Stereo: Does not exceed 0.5% AUDIO FREQUENCY RESPONSE _+l dB 20 Hz to 15,000 Hz with standard de-emphasis (75 psec.) and 19,000 Hz pilot filter. SELECTIVITY ADJACENT CHANNEL: 6 dB minimum IHF in NORMAL Position. 15 dB minimum IHF in NARROW Position. ALTERNATE CHANNEL: 58 dB minimu

5、m IHF in NORMAL Position. 88 dB minimum IHF in NARROW Position. SPURIOUS REJECTION 90 dB IHF minimum. IMAGE REJECTION 95 dB minimum, 88 MHz - 108 MHz. STEREO SEPARAT ION 35 dB at I,000 Hz. SCA FILTER 50 dB rejection from 67 kHz to Ik kHz. 275 dB per octave slope. PREAMPLIFIER SECTION FREQUENCY RESPO

6、NSE +0.5 dB, 20 Hz to 20,000 Hz. DISTORTION Less than 0.1% at 2.5 volts 20Hz to 20 kHz. INPUT SENSITIVITY (phono 1 and phono 2) 2 millivolts for 2.5 volts output at 1 kHz. OUTPUT (tape) 0.25 volts with rated input. Phono input signal of 10 millivolts produces 1.2 volts output. FM and AM will produce

7、 1.2 volts output at 100% modulation. OUTPUT (center channel) 2 volts with rated input to both channels. BASS CONTROL INPUT SENSITIVITY (aux, tape) 0.25 volts for 2.5 volts output. -18 dB to +16 dB at 20 Hz. TREBLE CONTROL HUM AND NOISE (phono 1 and phono 2) 72 dB below 10 millivolt input. +20 dB to

8、 20,000 Hz. LF FILTER 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 tion. FM and AM will produce up to 10 volts output at 100% modulation. Flat or roll off below 50 Hz, down 12 dB at 20 Hz. HF FILTER Flat

9、or roll off above 5000 Hz, down 12 dB at 20,000 Hz. MX 113 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 (pF); capacitance values greater than 1 are in picofarads (pF); inductors are in

10、microhenries (pH). ? 3. 4. 5. 6. b. c. d. Printed circuit 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 layouts. The heavy lines on the schematics denote the primary signal path. The terminal num

11、bering of rotary switches is for reference only. All voltages indicated on the schematics are measured under the following conditions: a. Use of an 11 megohm input impedance VTVM. All voltages +10% with respect to chassis ground. No signal at input or antenna terminals. AC input at 120 volts, 50/60

12、Hz. Front panel controls at: Tuning indicator 100 MHz (no signal) Fully CCW Stereo Out AM (to measure AM section) FM (to measure FM section) Panel Lights Bright Selectivity Out f. Voltages shown in rectangles are measured with selectivity switch in the In position. In units with serial no.s below 18

13、7H5 R219 and R225 are used. Volume Mode Muting Input Selector 7. In units with serial no.s below 190H0 R329 and R330 are 15K; C8 js 12pF R528 is used; D505 and D506 are not used and R530 is connected as shown by dotted line. 8. In units with serial no.s below 178H9 C38 is 3pF; C527 and C528 are not

14、used and dial glass is McIntosh part no. 044-359. 9. In units with serial no.s below 189H4 C505 is .02pF. 10. In units with serial no.s from 175HO to 190H0 C527 and D504 are used. 11. In units with serial no.s below 199H9 C124 is used and C402 is lOOpF. 12. In units with serial no.s from 167H5 to 17

15、8H8 C101 and C108 is not used. 13. In units with serial no.s below 182H5 R408 is 680fi; R411 is 10K; R412 and R418 are used. 14. In units with serial no.s from 238H2 to 282H6 C213 is used. In units with serial no.s below 282H6 R203 is used and L201 is not used. 15. In units with serial no.s below 32

16、2H6 R337 and R338 is 1.8k. 16. In units with serial no.s below 269H6 the MPX Lamp is a #1828 bulb and r419 is used. 17. In units with serial no.s below 262H1 C214 is not used. 18. In units with serial no.s below 400H1: R399 and R400 are 1M; C303, C304, C313 C346, C347, C348, C349, C350, C351, R399-2

17、 and R399-3 are not used and c415 is ,22pF. 19. In units with serial no.s below 282H6: C413 is .lpF; R415 and R416 are used; Q407 is not used and D407 is connected as shown by dotted lines. 20. In units with serial no.s below 334H9 R530 is 7.5k and D505 is McIntosh Part No. 070047. 21. In early unit

18、s R526 is not used. 22. In early units CIO and C35 are .OOlpF. TUNING CONDENSER DRUM 113 (TO IDLER PULLEY AND TUNING SHAFT) BLACK MX 113 R F CHASSIS IF PC BOARD 044-277 /-NOTE 12 RI06 IF OUT TO PREAMP SECTION TUNER SECTION 154-647 LEFT CHANNEL INPUTS TAPE AUX. ( TAPE OUT ( RIGHT CHANNEL INPUTS TAPE

19、( AUX. TAPE OUT ( MOTE 16. C 351 RED/ 1 io COAX ov| c 3CJ O (FROM MPX SEC AM INPUT -m-t (FROM TUNER SECTION) 0 RIGHT FM INPUT S$ (FROM MPX SECTION)! Wv SECTION I - FRONT SECTION 3-FRONT SECTION 3 REAR VIO/ I , wht/n 9.5 y x io -r* a o u -1 a. LEFT CHANNEL PREAMP. PRINTED CIRCUIT BOARD 044-554 MX 113

20、 N TO PIN 5 S30I- I REAR - MPX PC BOARD 044-299 C409 FROM FM OUTPUT OF TUNER SECTION 24V O 0401 6.3V R404 N o J S * s R428 3K 5% 00 *D tz o X * * J040 V r S y 4- “ 7V NR408 C408 , 1/ R414 C4I2 - i 220 f*: 5 4T cm o lk a1 1 100 25V 22 K IT * .0027 R413 r 100 K if PRINTED CIRCUIT BOARD 044-576 POWER S

21、UPPLY/CENTER CHANNEL SECTION MXII3 154-651 MULTIPLEX DECODER ALIGNMENT POWER SUPPLY PC BOARD 5. J *Q O m r V VfU . c” . Si i ijU r *|5 BOARD Q LU CxZ O LU Cxi O 4-1 4-* TJ C 0 U C 3 1- ID 3 3 0 3 1- 4-) fD cr 0 00 cr 0 c -Y 0 00 0 4-1 0 3 U i_ i_ 0 cr fD i_ i_ 0 i_ a; 0 CL 0 0 0 . 1 0 *. c fD i_ 41

22、4-1 CO 00 r LA 0 4-1 O 4-) fD LA 00 CD CO 0 l/l 0 l_ VD , 2: on X CO c 0 l/) Ll. 1- 0 2 C 4- 4-t 1- E 4- r- T i_ dj a; CD CNJ X i_ i_ 0 i_ i_ E 1- fD fD ID -Y 3 3 0 0 4-1 i_ -Y N i_ l/l l/l 41 C 0 U X fD fD ou 0 ID 0 M- fD 2_ d) 0 fD L- E 0 CL ID 2. 21 Cl 0 0 1_ 1 C Cl - - 1 c 1- CL 4-1 l_ CD l/l d)

23、 c * 0 0 0 fD L. . 0 00 4-1 4-4 * M CL 0 0 2 fD fD -V ID 0 C 0 l/l c LA CD 0 CD 21 -D d) CL 0 x . X Ll 0 CD 0 O r +1 , CT) N C C a: r 1 IC 0 X X 0 X CD Ul 0 * CL O 2 c fD X c 3 C c . 0 cr co 00 X 4- X 4- x* b 0 x- u u 0 fD u 21 2: 0 1- 3 d) 0 z 0 l/l fD i_ 0 2:1- W fD 0 X O CN 00 LA vD x CO cn ! on

24、C 0 X 4-1 -0 - X 0 0 O U 0 2: 1- 4-1 4-1 0 X X CL 0 0 C 4-1 c E L. d) 3 0 0 O 0X 4-1 C 0 4-1 X-N X l/l O c 0 4-1 0 CNJ 4-4 0 cn 0 -1 X c O LA cnx 4- O c 0 x on C 3 0 0 X l/l 1 CL C 4-1 0 l/l oi 0 4-1 4-1 CN 3 L. E u O c L. L- 0 c 1 - d) 0 O 0 L. u L- X 0 M- CL 3 0 2: 0 O -M 1- C O U vO 4_ 1- U 3 U 4

25、-1 O CL 0 0 4-10 00 fD dJ 4-1 0 X c c m- a) 4_l O 0 U1 0 0 E 0 0 4-1 X E -C O d) , 4-1 4-4 4-1 CL X X X CL C 1- 0 CL 4-1 0 E 1- O 0 0 2: 1- O 0 4-1 E CL 0 1 4- 2 U l/l C 0 4-1 21 fD l/l l/l O aio Ll l/l 0 0 0 0 1 OC -O L- O U 4-1 0 21 d) d) 0 0 0 u on o a) 4-1 2 l/l L- 0 i- on 4 * O 0 L X 0 x 00 0 J

26、 O l/l E d) 0 -Y O c 0 - x on 4-1 4-1 . i_ U L fD 4-i U 4-1 C U 0 O O LLJ C 0 i/i 1 0 0 0 E - S -Q4-1 4-1 L- O cn O 1/1 0 0 Ol 4- C X 4-1 3 Z 2 r u 0 3 0 0 0 0 J dJ u X cr x c ID X l/l u 0 O * 1- 1 1_ 1/1 . 0 4-1 4- CO E 0 O 4-1 4- E -41 O l/l 4- 2 4-1 C 0 0 p 3 C l- C OX X M- d) M- 1- 0 0 L. 4-1 0

27、u cn 4-1 X d) E 0 U 1- O C E c 1 Q.TJ c 3 0 CL C s fD d) - 0 O E -0 C CO U 3 CL C E 0 O c 0 3 0 cr cl O L. U 0 Ol l/l cr 0 a - l/l O 3 0 0 c E 4- 3 l- L- 4-* _Q l/l X ai CL 0 cr 0 0 3 0 C 0 l/l 0 X O X 0 1/1 1- 3 X ui c E X l/l c 0 0 cr u 4-4 000 l/l 0 0 4-4 0 4- 0 0 0 1/1 u x 4- 0 +- L. i_ 0 0 4-10

28、 4-1 C 0 u X l/l 4-1 3 4-1 c c 0 4-4 4- l/l U O CN 0 U 4-1 4- 0 U 0 0 o E 2 ifl- 1- 3 3 4- 0 X X 0 - c 0 U 0 U U 4-i 4-i cn C 0 4-4 L_ L. 0 0 - U CL 4- X X 4- 4- 0 C 4-i/i u u 1 1 0 Ll. U 4-j 0 N X X 0 cnr. x 4- i_ x x X a t/ 4- LA 1 fDOJOIIDIDONfD XX- EX E- + |E 4-1 u 0 c _ 0 i/i CD i_ cn (/l 4-J 0

29、 x a x u 0) i/l 1 4-J 0 4 O to X m a E 5 i/i 4_ 4 c c 0 = 0) CD 4-J E E 4-J U 4-1 l/l 0 4-J 1- - 1/1 4-1 CD 4-* CNJ 0 . X fA a c 4- a o 1- X j D 4-J i-j 4-J (j 4-1 4- u i/i 0 0 0) 3 X . l/l 0 0 a; X C to a i/i 0 0) CNJ - v_ o X oi a a) E a a 0 a 0 1 l/ 4-J CD 1 cu 4-J i/l CO - L_ i =5 0 4- u 4-J ro

30、0) 1/1 0 x a) c c 0 3 0 TO a 4i i/l X i/i TO 0) i- X 4-J 1 0) a o a c a i_ CD ro ro 0 U 4-J 0) X - i/l c a Ll_ 4-J . 4-* 0 c - 1/1 CU c 1- d) 1- 4-J - ro i/ 3 ro =3 0 i/i v_ c -x a a X CO - c E N 0 i- X CO O -m c 4J ro O a ro i/i J- 4-J D a; o c , i/l S i/l 0 X u X 4-1 a) o 1- E O E 0 D 4-J Q. 4-* E

31、 l/l d) O dJ 4-1 4-J 4-J 4-1 C X i/i ro TO TO X i_ E ro i/i 4-j 0 d X; cx 4 X -J d) 0 0 +J 0 3 X a E 4-J CO m no 4-J X i/i a TO 0 0 0 X a c d) a 0 u LA E O o * 4-J 1 4-J L- 0 CL. 4- CO- O LA O 14- 0 -X. c a 4-J 4-J 0 i/i 4-J - 1 3- c * ro cu 4-j d) l/l 4-1 X 4 - c X 0 o l IO 0 U 4- C u 0) CD X 4- 1_

32、 r4_ d CD CO d) OnEO X .x X -, X F- 1 u ro Ul d) d) +-a d) 0 4J a* t. - m ro ro c 4- 4-j CD d) X 4- 4- 0) cu o U c D X /i E u ro a =3 , 0 CD a cu a 4-j , - X ro i acA x a O i- O X 4-J C 4-J LA O O l/l c Cl) CD cO CM L - C 1/1 X X d) CNJ 4-1 4-J 4-J l/l 4-J ro d) ro - 4-1 - O t c (D J= 4 l/) C j j o

33、x c 3 D D D CU C d) 0 4-J a 4- a cu o ui =3 Q 4- ui a i- cu 0 0 u X ox 0 4-J l/l U (J u +j LA LA 1- L. 4-j d) 4-J 0 l/l O - CO l- 1/1 +-* c 4-j 2 ro 5 +j cu a CD d) CD =J 13 X ro O 4-J a c x l_ l/l l_ 4- i/l 4-1 * l/l i/l (D C l/l d) c 1- C i- 4-J +j 4-J D 0 d) 0 u u X 4-* ro a 4- CD4- CD 3 0) a ro

34、ro a U d) 4- X u 4-J 1- C CD 3 ro c 0 ro c 5 c 0 i/i 4-j a c ro c X ro c i_ X 0 G E u 5 O i_ 4-j 4-J O 0 0 0 CA 4- E C CNJ 1 CNJ | X a p 1 cn - r- i_ o 1_ 4-J 0 i/i X !_ - a 0 21 a a , l_ i_ a 0 1 x o cn x to d i o 4- X u 0 1_ 4-j C 0 u 0 N 0 E C i- c ro CD 0 X C u CD 4 X 0 4-J 1- C 3 MULTIPLEX DECO

35、DER ALIGNMENT MX 113 N _ c X 0 0 l*: to 0 03 c 0 to X X x N C CO 0 c - X 03 0- 0 0 4-J X X F F 00 fD CO X X cv3 4-J 0 0 X tO CN | 4-J tO X E c =3 0 0 T) =3 X to 0 .-,x N 0 c E cn x x IO fD 0 0 0* N U 4 0 1_ (O u* V X X 0 c c 0 0 0 03 1/) J* l- 0 X C X X 03 5 0 X 0 0 x to to Q_x O 3 0 C 03 D U a; c 1

36、/1 0 1 x (j i_ x -J CL E 0 2 5 X 03 (D X 0 0 0 0 E E 0 0 lx 0 3x cr X 0 0 to x X. TD X J_ 0 X 4- CL 0 0 l- 0 c ac 0 to X C 0 0 0 X x 0 N c x 0 0 CN X X 0 4- x _y 03 E 03 E c 0 u -00 c c: -3 c. i- c 03 03 0 0 1 X 0 0 CN X X X CL - X X u x cnj 0 x cl X 0 to to c I 3 E fO 0 C to X 0 l_ 0 E 0 4- E 0 1 X

37、 0 N 0 0 CL 0 U E - 0 0 X Q.X CLX 0 C C L 2: O X0C O E O c 0 03 to 0 to 0 0 0 to 0 Z O 4- to X l- X C X x 0 X 0 03 0 (0 X 0 u 0 u X X 0 0 03 0 03 0 X 0 E i- E 0 L. O L- U l/l 0 CL 0 X c i U L- XXL. Q_4 x c 03 0 c 0 3 0 0 0 C 0 O (J O u 21 0 4- to 0 u A 0 t 0 a 1- O O c I _ 0 X 13 03 X 0 cn 0 i- X O

38、0 CL 4- Q_-* E 03 E 0 1- 0 X 0 X X CD 0 E to X X CL to E to JJ X 0 0 X 0 0 U3 0 L 0 CN 0 ” HHI 03 10 0 1 L- to E . N L. 0 01 x 03 a; 0 0 4L 0 5 c -o 03 X * X L. - to 0 ? fD fD fD =3 CL c CO 0 a 03 O X 0 c - . to o o o N /l4 CN 4_l CN U -t O -3 l. h- 0 O -3 L 1 0 0 u 0 -1 0 u 0 i 1 X 03 CL 2: O CL -

39、fD o. I- H V) 0 1- O 03 h- - O O 03 XI 0 0 1 1 to 5 0 E E 1 u L 0 0 1- 0 0 0 05 CL CO CO . o L/ L_ 0 C 0 X 0 c r* 03 0 0 c c 0 0 C 03 D 4-* 0 0 0 0 0 0 c O to X X 0 3, * 0 cn 0 cn 1 N N 4-J X 0 X X C x 0 0 N 0 l- 0 E N 0 1- 0 O JX E X X 0 s- . X X O X LT3 03 0 LC 0 O C -X 0 o r-. 41 CL CO E -1 CL c

40、0 E 1 CL 5 03 CD _u C 03 0 C L* 03 C X C- i - 0 0 fD 0 C O C! E L L c O 5 03 0 0 0 z O L. Q_ U 03 X X E E E E CD O 33 CL 03 03 fD 0 0 0 WO fop d E w E c CO CO CO CO N N N X X 0 0 X d 2! 2: O O LU O O CO CO O O N N N oc z X X 0 0 2: Z o 1 LU WO O O O O E 0 CO E 0 CO O O a. CN| CO LO wo LU UJ WO o WO

41、LU CSI d I N O O to LT3 E X c 0 0 JZ o X LT 0 4- X 0 X 0 L. o l/l X 03 to X 1/1 1-0 0 O 1-0 X C fo m fo - X) D D CL) C to Q_ 0 =5 E Q3 Q)i- 0 O 0 C C X 03 0) fD XI- WO D D CL C 4- E 0) 03 D 4-* o REPLACEMENT PARTS DIODES All parts not listed are common items obtain able from radio parts jobbers. Rep

42、lacement parts may be obtained when ordered by PART NUMBER from: McIntosh Laboratory, Inc. Customer Service Department 2 Chambers Street Binghamton, New York 13903 (telephone 607-723-3512) CAPACITORS C1 09 Ta. Elect. 22 pF 20V 066-148 C201 Elect. lOpF 50V 066-221 C204 El ect. 200/200pF 100V 066-159

43、C202 Mylar . 22 pF 250V 064-068 C205.206 Mylar 22pF 250 V 064-068 C207 My 1 a r .47pF 250V 064-069 C208.209 Elect. 100pF 16V 066-177 C210 Elect. 50/200/300/150pF 066-128 200/150/50/50V C301,302 My 1 a r .47 pF 250V 064-069 C305.306 Ta. Elect. 10pF 20V 066-149 C307.308 Ta. Elect. 1 OpF 20V 066-14-9 C

44、315.316 Elect. 1 OOpF 15V 066-226 C317.318 Mylar 47 pF 250V 064-069 C319.320 My 1 a r . 2 2 pF 200V 064-087 C321,322 Po1yp ropy 1ene ,0068pF 064-103 C323.324 Mylar .047pF 250V 064-066 C325.326 Mylar .47PF 250V 064-069 C 32 7 Mylar i+7pF 250 V 064-069 C329.330 Mylar .047pF 2 50 V 064-066 C331,332 Myl

45、ar .022 pF 250V 064-065 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 .47 pF 250V 064-069 C401 Mylar . 22 pF 250V 064-068 C405 Elect. 1 OOpF 25V 066-161 C408 Elect. 1 OOpF 2 5V 066“161 C41 1 Ta. Elect. 1 .OpF 35 V 066-147 C41 5 Mylar lOpF 63V 064-178 C502 Polystyrene 4700pF 064-091 C503 Ta. E1ect. 47pF 35V 066