User manual MCINTOSH MA 230 SERVICS BULLETINS

[. . . ] 2 C H A M B ES T R E E T I N G H A M T N E W O R K I l-; resistance values are in ohms, L/2 Unless otherwise specified, Capacitance values smaller than I watt, and I0% tolerance. (mfd); values greater than t are in picoare in microfarads (pF. [. . . ] farads ) switches The terminal numbering of rotary board wires is for reference only. Use of AII are measured under the an lO-megohm input !LO% with input and printed circuit following conditions: impedance VTVM voltmeter. to chassis ground. voltages at at respect No signal AC input terminals. at: Tape Phase Speaker Power LF Filter HF Filter Iroudness NOR}iIAL LL7 volts, Front panel controls AIIX STEREO IVIAX ZERO FI, AT FI, AT RTAA Input Selector Mode Selector Volume Balance Bass TrebIe Comp oo ON ON FLAT FI, AT NORMAL P R E A M PS E C T I O N R I N T E DC I R C U I T O A R D O 4 3 - 7 2 3 , P B - REAR i ", ';;ir l r----. , , -k=. "', i;'"Illi ", . --*4, . ^r-:, :ll lo F l O. aux TAPE TUXER PHONO I PHONO 2 I z - J lrJ 1 I i J z Z TAPE HO o F r lrl J TAPE l_ uorrron TAPE OUTPUT r/2 PARrum-Oza _ j f- I I tov RII I RI7 I I I I z 8V l O O n t d / 1 2V E tul 3= -z Le_t - RzZ 75VI t5K ct2 I I I ORN/WHT I il i :f I / / FRONT SI. 2 (PARTIAL) I :{ ' c24 -22 -r---l_ 1l I I I I I T o F f o- aux TAPE Tur{ER 33 z - pHolo t J IIJ PHONO 2 '----J ; ; L_"!to"gglt:-J z I o F I Z rlpE Ho s4 FRONI I TAPE tr. LroNrToR TAPE OUTPUT - +R58C I I I (FILTER SECTION) R 648 500 K i I I -t 82 K I I I l1 lr ll , 47 vto loo K L c r5 rj. ", . . :". lOOald/ l2 V Qtl l-"rl =l tsl "l dl LTI . 47/75V PREAMP. SECTION P R I N T E D C I R C U I TE O A R D o43- 723 li-- ct8 R40 l5 oto c22 R I G H TO U T P U T Ei 3l "rI I I I i i n: I I I I I J H E A V Y L I N E S H O W S P R I M A R YS I G N A L P A T H L+ R55 to0K 5% R 5 8 D ( F I L T E R S E C T I o N) R6 4 A 500 K I PREAMP. ECTON S M A5 l O O 154- 282 R5EB ( P R ET P S E C T I O N ) A r | + l REol I gRl/\_ I clol . t lot . 2 R to5 R lo7 7--i t 6 ri l l L : I l + l I o=l* * . , , , tl 9 I I I q I I - . "1:'I nld 20* 6RED^ LEFT IIIPUT_ (FROI LEFT OUTPUT OF PREAMPSECTIONI I I I 3. 3X5% t o :3 q *d l. av I I ;. ?; I 26vl 4v Y coxur* Lf: \olo5 I )o, o, l e c ll3 zoa \, . o, t l t I I I aLx Y -17 I , "o'l o'9-", o, I I FrAiFl a U ' e R ro9 470 K '! t50 R||9 r. 5ilr; I I : : !K 5L |+ Tqo r< tJ r* lEl tul llll =l*l I ARD F I L T E R S E C T I O N P R I T E D C R C U I TB C 722 o43 :ov*-@!I-rsv I F]l tr B] I I "ldl tit r l l+i --9, + 'lql trl R E o wtr J'\ o. RepI-acement parts may be obtained by PART NIIMBER from: obtain- D2O9, zto DzLr, 2r2 uar), zL+ Silicon Silicon Silicon Silicon S il- icon S ilicon S il-icon Sil-icon S il- icon Silicon Sil-icon Sil icon signal s ignal diode d"iode o7o-o22 070-031 070-031 070-03r070-031 070-031 070-031 rect ifier ::ect if ier nectif ie:: when ordered D30rD302 Mcfntosh Laboratory, Inc. Custome:: Service Department 2 Chambers Street Binghamton, New York 13903 ( t e l e p h o n e 6 0 7- 7 z 3 i 5 r z ) CAPACITORS Syrnbol Nurnber Description Mylar Mylar El-ect. Elect. E-l aa{- D303 D304 D305 D306 Part Number rect ifier nect ifier r. ect if ier rect ifier rect ifier rectifier rect if ier o?n-nl, l D307 D30B D309 070-041 o7n-o)' 1 cr, 2 c7, B cg, l_0 CII, T2 c13, 14 u l_) , l_o d1, 1Q . 1Z17t 4rAV 061+-043 u o + - u J/ 066-018 070-030 . luF lOOuF . fuF . luF 25OV IzV 25ov 25ov FUSES Flnt . r'use l. )A 5Io-lrt-o CHOKES nRo-n r ( o64-o37 061+-037 064-039 064-01+5 TRANSISTORS L?OI, 2O2 Choke . 47"r 100uF 75v . 47uF 250v 12V 2uF r22-o64 CI9, 20 056-018 061+-045 064-043 - czr, 22 c23, 2+ c101, 102 vru), nln? v!v qr, 2 Q3, 4 q5, 6 Q 7 , B 1 Q9r 0 Ql1, 12 . 47uF . 22uF . J-u"e 25ov 25ov 12Av ^/^i^z Sillcon Sillcon Silicon Silicon Silicon NPNTransistor NPN Tr:ansistor NPN Transisror NPN Tr. ansiston NPN Transistor !A7o 064-o3B 132-002 Iv+ t rrvv . oluF . 22uF 1uF 1. 5uF 100uF lBOuF ASov a0% 064-o40 25OV 35v 35v lzY 3V 064-01+3 066-091 066-092 066-018 066-r_11 064-01r4 064-044 UOO - l-LrJ f nA cll_1 Silicon. NPN Trans istor NPN Transistor NPN Tnansisror PNP Transistor PNP Transistor: NPN Transisror 1?, 2-n21 1 ?2-(Or crrz, rI3 vav)rzv+ Q101, 102 Silicon rtfuJrru4 ^r ^ ^ r ^l Silicon Sillcon Silicon Silicon q20r, 202 4zu), av+ q2o5, 206 c207 , 2O8 c2r1, 21_2 c2I3, 2r+ c304 c305 ca06 c307 caoB ca09 E1ect. u4i u-c zruv 80/Bo/r5o/5ouF 2oo/200/L'o /r'ov 2oo/'oouP t oo/50v 2oO/5oouF -100/ _75v 100uF 12V q 2 o 7 , 2 O B Sil-icon NPN Transistor q2O9, 2rO qzII, 2t2 q2I3'21-l+ Silicon Silicon Silicon Silicon Silicon PNP T::ansistor NPN T::ansistor NPN Transisror PNP Transistor NPN Transistor r32-O?t 1?2-O1, 2 o66-o99 066-o93 066-018 065-106 055-106 Lt. ->v I q2I5, 2]. 6 q2I7, 2rB q2r9, 220 9300uF I+5V 9300uF' Ii5v DIODES Sil-icon NPN Transistor POTENTIOMETERS K'J Balance control Volume control Bass control Trebl-e control Ri oo od irrc{: | <il-(t <\ DzOI, 2O2 D2O3, 2O4 D2O5, 206 D2O7, 2O8 Silicon Silicon S ilicon S ilicon reference rect ifier rect ifier s ignal d"iode 070-040 070-030 070-030 07o-022 R5B R63 R64 R22I , 222 L)+-VJJ 'l 'I 1, lt 17) ?Jr-l?? d"iod"e !)+-lzv R2l+7 L & R aclJust RESISTORS rr+loej Bass knob (front) ol+3-625 LAMPS R23r, 232 R237, 238 R239, 2+O R?+9, 25o R301 R3A2, 3O3 R307 R308 R311 R3r2 R313 tilLrewound. hllrewound' Wirewound Winewonnd WLrewound. [. . . ] u4i u-c zruv 80/Bo/r5o/5ouF 2oo/200/L'o /r'ov 2oo/'oouP t oo/50v 2oO/5oouF -100/ _75v 100uF 12V q 2 o 7 , 2 O B Sil-icon NPN Transistor q2O9, 2rO qzII, 2t2 q2I3'21-l+ Silicon Silicon Silicon Silicon Silicon PNP T::ansistor NPN T::ansistor NPN Transisror PNP Transistor NPN Transistor r32-O?t 1?2-O1, 2 o66-o99 066-o93 066-018 065-106 055-106 Lt. ->v I q2I5, 2]. 6 q2I7, 2rB q2r9, 220 9300uF I+5V 9300uF' Ii5v DIODES Sil-icon NPN Transistor POTENTIOMETERS K'J Balance control Volume control Bass control Trebl-e control Ri oo od irrc{: | <il-(t <\ DzOI, 2O2 D2O3, 2O4 D2O5, 206 D2O7, 2O8 Silicon Silicon S ilicon S ilicon reference rect ifier rect ifier s ignal d"iode 070-040 070-030 070-030 07o-022 R5B R63 R64 R22I , 222 L)+-VJJ 'l 'I 1, lt 17) ?Jr-l?? d"iod"e !)+-lzv R2l+7 L & R aclJust RESISTORS rr+loej Bass knob (front) ol+3-625 LAMPS R23r, 232 R237, 238 R239, 2+O R?+9, 25o R301 R3A2, 3O3 R307 R308 R311 R3r2 R313 tilLrewound. hllrewound' Wirewound Winewonnd WLrewound. [. . . ]