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INTEGRATED AMPLIFIER
CONTENTS
Performance Specifications ........................................ 2 Notes ......................................................................... 2 Rear Panel .................................................................. 3 Section Location ........................................................ 4 Block Diagram ...................................................... 5 - 6 Interconnection Diagram ...................................... 7 - 8 Main Schematic and PCB .................................... 9 - 18 Balanced Schematic and PCB .............................. 12, 18 Heatsink Schematic and PCB ............................. 19 - 20 Capacitor Schematic and PCB ........................... 21 - 22 Control Schematic and PCB .............................. 23 - 26 Lamp Schematic and PCB ................................. 25 - 26 Tone Schematic and PCB .................................. 27 - 31 Keyboard Schematic and PCB ........................... 30 - 32 Parts List ............................................................ 33 - 36 Exploded Views and Parts Lists .......................... 37 - 40 Repacking Instruction .............................................. 41
SERVICE MANUAL
PERFORMANCE SPECIFICATIONS
Power Output Minimum sine wave continuous average power output per channel, all channels operating is: 200 watts into 2 ohm load 200 watts into 4 ohm load 200 watts into 8 ohm load Rated Power Band 20Hz to 20,000Hz Total Harmonic Distortion Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power output is: 0.005% for 2, 4 or 8 ohm loads Dynamic Headroom 2.4dB Frequency Response +0, -0.5dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 100,000Hz Sensitivity Phono, 2.5mV for 2.5V rated output (0.5mV IHF) High Level, 250mV for 2.5V rated output (50mV IHF) Power Amplifier Input, 2.5V for rated output Signal To Noise Ratio (A Weighted) 90dB (84dB IHF) below 10mV input, Phono Input 100dB (90dB IHF) below rated output, High Level 110dB below rated output, Power Amplifier Intermodulation Distortion Maximum Intermodulation Distortion if instantaneous peak output per channel does not exceed twice the rated output, for any combination of frequencies from 20Hz to 20,000Hz, with all channels operating is: 0.005% for 2, 4 or 8 ohm loads Input Impedance Phono, 47k ohms, 65pF High Level, 22k ohms Maximum Input Signal Phono, 90mV High Level, 8V Preamplifier Maximum Voltage Output Phono, 8V at tape output High Level, 8V at tape output Main Out, 8V at preamp output Voltage Gain High Level to Tape: 0dB High Level to Main: 20dB Wide Band Damping Factor Greater than 40 Power Requirements 100 Volts, ~ 50/60Hz at 4.8 amps 110 Volts, ~ 50/60Hz at 4.4 amps 120 Volts, ~ 50/60Hz at 4.2 amps 220 Volts, ~ 50/60Hz at 2.0 amps 230 Volts, ~ 50/60Hz at 2.0 amps 240 Volts, ~ 50/60Hz at 2.0 amps
Note: Refer to the rear panel of the MA6900 for the correct voltage.
Overall Dimensions Front Panel: 17-1/2 inches (44.45cm) wide, 7-1/8 inches (18.10cm) high. Depth behind front mounting panel is 16-1/2 inches (41.91cm). Clearance required in front of the Front Panel is 1 inch (2.54cm) for knobs. Weight 74.5 pounds (33.8 Kg) net, 92.5 pounds (41.7 Kg) in shipping carton
NOTES
1. The heavy lines on the schematic denote the primary signal path. 2. Unless otherwise noted, all voltages indicated on the schematics are measured under the following conditions: a. AC input at 120 volts, 50/60Hz. b. All voltages are +/-10% with respect to ground. A high impedance (10 megaohm) voltmeter must be used. 3. Unless otherwise specified: a. Resistor values are in ohms. b. Capacitor values are microfarads (uF). c. Inductor values are in microhenries (uH). 4. On PC board drawings, Square pad indicates: a. Polarized Capacitors - Positive b. Diodes - Cathode c. Others - Pin 1
5.
WARNING
Parts marked with the symbol have critical characteristics. Use only replacement parts recommended by the manufacturer.
2
MA6900
REAR PANEL
3
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED
BOTTOM VIEW WITH COVER REMOVED
4
MA6900
BLOCK DIAGRAM
5
6
1
INTERCONNECT
TB1
7
8
MA6900
2 MAIN
049688
1 OF 3
9
10
11
2
MAIN
049688
2 OF 3
3 BALANCED
12
13
14
MA6900
2
MAIN
049654
3 OF 3
15
16
2
MAIN
049654
3
BALANCED
049654B
17
18
MA6900
4A 4B
HEATSINK
049665
19
20
5
CAPACITOR
049653
21
22
MA6900
6
CONTROL
049655
23
24
6
CONTROL PCB
049655
7A 7B
LAMP
049235
25
26
MA6900
8
TONE
049656
27
28
29
8
TONE
049656
9
KEYBOARD
049696
30
31
32
MA6900
PARTS LIST
Reference No.
Interconnect F1 MT1 MT2 RT1 RT2 S1 T1 T2 T3 TB1 049654 MAIN PCB C1 C2 C69 C70 C71 C72 C73 C74 C75 C76 C3 C4 C9 C10 C11 C12 C47 C48 C49 C5 C6 C93 C94 C7 C8 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C27 C28 C31 C25 C26 C29 C30 C38 C41 C42 C55 C56 C33 C34 C39 C40 C43 C44 C45 C46 C53 C35 C36 C50 C51 C52 C59 C60 C91 C92 C54 C77 C78 C87 C88 C57 C58 C89 C90 C61 C62 C63 C64 C65 C66 C118 C119 C67 C68 C95 C96 C97 C98 C99 C103 C79 C80 C81 C82 C83 C84 C85 C86 C100 C101 C102 C104 C105 C107 C110 C114 C106 C108 C113 C109 C112 C116 C111 C115 C117 D1 D2 D3 D4 D5 D6 D7 D8 D11 D12 D9 D10 D13 D14 D15 D16 D17 D18 D19 D20 D21 D23 D24 D22 F1 F1 F2 F3 F2 F3 IC1 IC2 IC3 IC16 IC4 IC5 IC6 IC7 IC17 IC8 IC10 IC12 IC9 IC11 IC13 IC14 IC15 J1 J2 J3 J4 J6 J5 J7 J8 J9 J10 J11 J12 J13 J14 J15 J16 J17 J18 J19 J20 J21 J22 J23 J24 J25 J26 J27
Description
FUSE METER THERMISTOR SWITCH POWER TRANSFORMER OUTPUT TRANSFORMER TERMINAL BLOCK CAP ELECT 10UF 16V CAP MONO 100PF 100V 10% CAP ELECT 47UF 35V CAP DISC .47UF 50V MONO CAP POLY .15UF 10% 250V CAP POLY .047UF 10% 250V CAP MPOLY .0068UF 5% 63VDC CAP ELECT 10UF 100VDC CAP MONO .1UF 50V 20% Z5U CAP ELECT 10UF 50V CAP ELECT 1UF 50V CAP MONO 100PF 100V 10% CAP ELECT 10UF 50V CAP MONO 47PF 200V 10% CAP M POLY .033UF 5% 63VDC CAP M POLY .01UF 5% 63VDC CAP ELECT 220UF 25V CAP MONO .1UF 50V 20% CAP ELECT 10UF 16V CAP MONO 220PF 100V 10% CAP MONO .1UF 50V 20% Z5U CAP ELECT 470UF 50V CAP ELECT 1000UF 25V CAP ELECT 3300UF 35V CAP ELECT 100UF 25V CAP M POLY .1UF 10% 100VDC DIODE SILICON DIODE ZENER 16V 5% 500MW DIODE RECTIFIER DIODE SILICON DIODE ZENER 8.2V 1/2W FUSE 2A SLO-BLO 5X20 HLDR FUSE 5X20MM PCB MNT FUSE 5X20 1.6A IEC SLO-BLO IC NAND 2 INPUT X 4 IC OPERATIONAL AMPLIFIER IC OPRTINL AMP LOW NOISE IC DUAL OPERATIONAL AMP IC SHFT REG SER-PAR IC OCTAL DAR TRNS ARRY IC 8 LN DRIVER ARRAY IC AND 2 INPUT X 4 CONN MALE 7 PIN CONN 4 PIN CONN 23PIN FFC CONN MALE 3 POS MTS100 NRML CONN 8 POS MALE FRCTION LK BLADE FASTON W/FEET RECEPTACLE XLR FEMALE RCA JACK 3X2 WHT/RED 14MM JACK HDPHNE DUAL BLACK 1/8 CONN GOLD F RIGHT ANGLE CONN MALE 5 PIN 0.1 POST
Part No.
08910400 12707700 05200800 14807300 04967600 04967500 07409100 06638200 06130000 06644600 06124900 06436300 06436400 06431000 06646200 06130500 06644500 06651000 06130000 06644500 06129900 06431800 06431200 06650700 06130500 06638200 06130100 06130500 06646900 06651300 06650900 06644700 06425400 07004700 07011400 07013100 07004700 07013000 08908900 17815900 08909600 13316100 13302800 13306700 13326000 13318600 13336000 13318000 13317500 11721700 11721500 11771500 11721400 11727500 11770800 11768500 11779000 11754900 11766100 11721600
K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12 K13 K14 K15 K16 K17 K18 K19 LDR1 LDR2 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q19 Q20 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q27 Q28 Q29 Q30 Q37 Q38 Q48 Q17 Q18 Q21 Q22 Q23 Q24 Q25 Q31 Q33 Q34 Q41 Q42 Q43 Q44 Q46 Q52 Q53 Q35 Q36 Q39 Q40 Q45 Q47 Q49 Q50 Q51 Q54 R1 R2 R23 R24 R26 R61 R62 R91 R92 R3 R4 R49 R50 R53 R54 R84 R171 R5 R6 R15 R16 R7 R8 R93 R94 R9 R10 R11 R12 R113 R114 R170 R19 R20 R137 R141 R146 R147 R151 R21 R22 R77 R78 R79 R80 R155 R25 R27 R29 R30 R63 64 R101 R102 R35 R36 R37 R38 R39 R40 R59 R60 R41 R42 R43 R44 R45 R46 R47 R48 R132 R51 R52 R55 R56 R57 R58 R65 R66 R67 R68 R69 R70 R71 R72 R73 R74 R75 R76 R81 R83 R166 R167 R82 R87 R85 R86 R89 R90 R111 R129 R145 R95 R96 R97 R98 R99 R100 R103 R104 R105 R106 R107 R108 R109 R110 R112 R125 R126 R127 R128 R130 R131 R115 R116 R117 R118 R119 R120 R172 R121 R122 R123 R124 R13 R14 R17 R18 R31 R32 R33 R34 R133 R134 R135 R138 R139 R136 R140 R142 R143 R144 R148 R149 R150 R152 R153 R154 R156 R157 R158 R159 R160 R161 R162 R163 R164 R165 R168 R169 R173 S1 SP1 SP2
RLY REED FORM 1A 5V 500OHMS RLY REED FORM 1A 5V 500OHMS RELAY POWER TV5 24V LDR NETWORK VTL5C9 TRANSISTOR N JFET TRANSISTOR NPN TRANSISTOR PNP 120V TRANSISTOR PNP TRANSISTOR NPN 2K/REEL TRANSISTOR NPN 2K/REEL TRANSISTOR PNP 2SA32IC TRANSISTOR NPN 25C3334C TRANS POWER N-CHN ENHANCE IC REGULATOR +5V IC REGULATOR -15V IC REGULATOR 15V TRANS P CHAN JUNCTION FET RES MF 10K 1% 1/4W RES MF 3.32K 1% 1/4W RES MF 475 1% 1/4W RES MF 10M 1% 1/4W RES MF 47.5K 1% 1/4W RES MF 1K 1% 1/4W RES MF 100 1% 1/4W RES MF 165K 1% 1/4W RES MF 68.1K 1% 1/4W RES MF 4.75K 1% 1/4W RES MF 806 1% 1/4W RES MF 187K 1% 1/4W RES MF 221 1% 1/4W RES MF 324 OHM 1% 1/4W RES 1.8 OHM 2W 5% WW FP RES WW 2.7 OHM 2W 5% FP RES MF 27.4K 1% 1/4W RES FP 47 OHM 5% 1/4W RES MF 12.1K 1% 1/4W RES MF 2.1K 1% 1/4W RES MF 20K 1% 1/4W RES MF 100K 1% 1/4W RES MF 274K 1% 1/4W POT TRIM 100K OHM RES MF 2.21M 1/4W RES MF 11K 1% 1/4W RES MF 5.62K OHM 1% 1/4W RES NETWORK 2X220K ISO RES MF 47.5 1% 1/4W RES MF 95.3K 1% 1/4W RES MF 7.5K 1% 1/4W RES MF 95.3 1% 1/4W RES MF 2.21 OHM 1/4W 1% RES MF 267K 1% 1/4W RES MF 221 1% 1/4W RES NET 2 X 22K ISOLATED RES MF 30.1K 1% 1/4W RES NETWORK 2X220K ISO RES MF 22.1 1% 1/4W RES MF 1K 1% 1/4W RES NETWORK 8X100 ISO RES MF 182 1/4W 1% RES MF 182 1/4W 1% RES MF 178K 1% 1/4W RES MF 3.65K 1% 1/4W RES MF 3.16K 1% 1/4W RES MF 5.11K 1% 1/4W SWITCH SLIDE BRACKET PCB CARD MOUNTING
08705000 08705000 08706900 14417900 13222200 13225400 13225500 13222400 13222300 13222300 13228600 13228500 13224200 13310800 13315300 13315400 13222600 14405300 14409500 14408600 14426400 14410800 14409000 14419600 14411600 14408100 14409700 14408900 14440600 14417200 14433800 13923000 13921800 14414100 13704200 14415400 14429900 14410400 14411300 14444100 13450200 14426500 14410100 14444700 14426200 14444200 14412700 14421000 14422000 14437800 14411800 14417200 14436600 14422500 14426200 14416000 14409000 14427500 14427300 14427300 14442000 14418900 14419900 14408300 14805900 00361100
33
34
PARTS LIST con't
Reference No.
049665 HEATSINK PCB C1 C2 C3 C5 C7 C8 C9 C16 C10 D1 D2 D3 D4 D5 D6 D7 J1J2J4 J4Q1 Q2 Q6 Q7 R1 R8 R2 R9 R3 R10 R6 R11 R7 R12 R13 R30 R31 R32 R33 R36 R37 R38 RT1 049653 CAPACITOR PCB C1 C2 C3 D1 D2 D3 J1 J2 J3 J4 J5 J6 J7 J8 J9 K1 K2 049655 CONTROL PCB C3 C5 C6 C7 C10 C4 C8 C9 DS1 DS2 DS3 DS4 DS5 DS6 DS7 DS8 DS9 DS10 DS11 DS12 DS13 DS14 DS15 DS16 DS17 DS18 DS19 DS20 DS21 DS23 IC1 IC2 IC3 IC4 IC5 IC5 IC6 J1 J6 J7 J8 R2 R3 R4 R5 R16 R6 R7 R8 R9 R10 R11 R12 R13 R20 R21
R14 R15 R19 Y1
RES MF 1K 1% 1/4W RES MF 2.21 OHM 1/4W 1% RESONATOR CERAMIC 6.0MHZ W/CAP LAMP 14V #7373 4 PIN RT. ANGLE CONN. 2 POS. R-ANGLE CAP M POLY .1UF 10% 100VDC CAP ELECT 10UF 16V (4X5 CASE) CAP MONO 220PF 100V 10% NPO CAP MONO 47PF 200V 10% NPO CAP MONO 22PF 200V 10% NPO CAP ELECT 220UF 25V CAP ELECT 47UF 50V CAP ELECT 10UF 50V CAP M POLY .047UF 5% 63VDC CAP ELECT 1.5UF 10% 50V CAP M POLY .01UF 5% 63VDC CAP M POLY .47UF 5% 50/63VDC CAP MPOLY .0033UF 5% 63VDC CAP M POLY .15UF 5% 63VDC CAP POLY 0.001MF 5% 63VDC CAP M POLY .033UF 5% 63VDC CAP M POLY .22UF 5% 63VDC CAP MONO 470PF 100V 10% NPO CAP MONO .1UF 50V 20% Z5U CAP ELECT 47UF 10V BP DIODE SILICON IC DUAL OPERATIONAL AMPLIFIER IC OPERATIONAL AMPLIFIER CONN 8 POS MALE FRICTION LOCK CONN 4 PIN CONN MALE 6 POS RT ANGLE RELAY REED FORM 1A 5V 500 OHMS POT 50KAX2 POT BALANCE 2KOHM POT EQUAL RES MF 2.21K 1% 1/4W RES MF 3.32K 1% 1/4W RES MF 475K 1% 1/4W RES MF 1K 1% 1/4W RES MF 10K 1% 1/4W RES MF 2.74K 1% 1/4W RES MF 681 1% 1/4W RES MF 100K 1% 1/4W RES MF 475 1% 1/4W RES MF 40.2K 1% 1/4W RES MF 100K 1% 1/4W RES MF 33.2K 1% 1/4W RES MF 22.1 1% 1/4W RES MF 100 1% 1/4W RES MF 10 1% 1/4W CAP MONO .1UF 50V 20% Z5U CAP ELECT 47UF 35V JACK PHONO 1/8 STEREO VER CONN 4 PIN CONN 12 PIN FFC GASKET SENSOR RECEIVER IR RES MF 100 1% 1/4W SWITCH TACT
14409000 14437800 18003900 05812000 11724000 11727400 06425400 06638200 06130100 06129900 06129800 06650700 06621500 06644500 06432000 06627100 06431200 06433300 06430600 06432700 06430000 06431800 06432900 06130200 06130500 06637800 07004700 13326000 13302800 11727500 11721500 11770700 08705000 13449000 13446400 13445700 14429800 14409500 14436400 14409000 14405300 14430400 14419500 14411300 14408600 14410700 14411300 14401500 14416000 14419600 14415700 06130500 06644600 11746200 11721500 11772000 09437700 12104100 14419600 15005800
Description
Part No.
CAP ELECT 47UF 35V CAP MONO .1UF 50V 20% Z5U CAP MONO 100PF 100V 10% NPO CAP MONO .01UF 50V 20% X7R CAP POLYPROP 0.15UF 10% 250VDC DIODE SILICON DIODE 200V 6A CONN MALE 7 PIN CONN HEADER 2 PIN 0.156 BLADE FASTON W/FEET CONN MALE 2 PIN TRANSISTOR NPN SILICON TRANSISTOR PNP SILICON TRANSISTOR NPN TRANSISTOR PNP RES MF 221 1% 1/4W RES MET OX 680 5% .5W RES MF 15K 1% 1/4W RES MET OX 1.8K 5% .5W RES MET OX 430 5% .5W RES MET OX 47 5% .5W POT TRIM 200 OHM 20% HORIZ AD RES MF 2.21 OHM 1/4W 1% RES WW .5 OHM 5W 5% SENSOR THERMAL CAP ELECT 25000UF 75V CAP M POLY .22UF 20% 400VDC DIODE SILICON DIODE BRIDGE RECTIFIER CONN MALE 3 POS MTS100 NORMAL CONN HEADER 2 PIN 0.156 BLADE FASTON W/FEET RELAY 24V TV8/VDE CERTIFIED CAP MONO .1UF 50V 20% Z5U CAP ELECT 220UF 25V CAP MONO 220PF 100V 10% NPO LED LAMP RED LED LAMP RED LED AMBER LAMP INCANDESCENT 14V 100MA LAMP INCANDESCENT 14V 100MA IC AND 2 INPUT X 4 IC DC MOTOR DRIVER IC SHFT REG SER-PAR IC PROGRAMMED SOCKET IC 24-PIN IC MICRO RESET POS CONN 23PIN FFC CONN 12 PIN FFC CONN 4 PIN RES MF 100K 1% 1/4W RES MF 75 OHM 1% 1/4W RES MF 10 1% 1/4W RES MF 10K 1% 1/4W RES NETWORK 3X10K BUSSED RES MF 324 OHM 1% 1/4W
06644600 06130500 06130000 06130400 06436300 07004700 07013300 11721700 11740400 11770800 11721300 13217100 13217200 13226200 13226100 14417200 13709300 14441200 13709400 13709500 13709600 13439000 14437800 13917700 14424900 06650400 06426700 07004700 07013900 11721400 11740400 11770800 08707200 06130500 06650700 06130100 07009300 07009300 05813300 05815300 05815300 13317500 13319100 13318600 13343800 17813900 13324100 11771500 11772000 11721500 14411300 14444400 14415700 14405300 14429000 14433800
049235 LAMP PCB DS1 DS2 DS3 J1 J2 049656 TONE PCB C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C33 C34 C15 C16 C43 C44 C45 C46 C54 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C35 C36 C37 C38 C39 C40 C41 C42 C47 C48 C49 C50 C51 C52 C53 D1 D2 IC1 IC6 IC7 IC2 IC3 IC4 IC5 J1 J2 J3 K1 K2 K3 R1 R2 R3 R4 R5 R6 R7 R9 R10 R11 R12 R13 R14 R15 R16 R19 R20 R17 R18 R21 R22 R45 R46 R23 R24 R27 R28 R31 R32 R35 R36 R25 R26R29 R30 R33 R34 R37 R38 R43 R39 R40 R41 R42 R44 R51 R52 R47 R48 R49 R50 R53 R54 R55 R56 R57 R58 049696 KEYBOARD PCB C1 C2 J3 J4 J5 MT1 MT1 R1 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12
35
36
MA6900
EXPLODED VIEW
37
38
EXPLODED VIEW
EXPLODED PARTS LIST
Item No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
Part No.
016456 148073 017531 017517 078033 749695 104017 749694 104073 017854 018707 400149 018738 094016 004899 018612 401042 094360 401172 017363 094017 017864 022314 749696 005475 410004 404013 410002 404014 077032 401054 750510 021165 402001 749656 124092 092342 017447 749235 114072 005714 126819 400287 400250 005702 749675 749676 166128 166129
Description
GLASS INPUT POWER SWITCH PUSHBUTTON ASSY RED PUSHBUTTON ASSY BLK O-RING KNOB ASSY WASHER FELT BLK 3/4 X 1/4 X 1/16 KNOB ASSY WASHER FELT 1/4 X 5/8 MPI-4 BEZEL HEADPHONE BOTTOM EXTRUSION SCREW MACH 6-32 X 1/4 FL U/H ST TOP EXTRUSION TAPE FOAM 1/4 X 1/8 BRACKET EXTRUSION ENDCAP 7" SCREW TS 4-40 X 1/2 SLOT FILLISTER TAPE FOAM 1/2 X 1/2 SCREW TC 6-32 X 1/4 PH FL U/C PLEXIGLAS FILTER LT BLUE TAPE FOAM 1/4 X 1/4 PLEXI MA6900 FISHPAPER SHIELD KEYBOARD PCB ASSY SUBPANEL NUT CONTROL M7 X 0.75 HEX WASHER LOCK 5/16 X .435 X .002 NUT 5 CONTROL M9 X 0.75 WASHER LOCK 3/8 X .507 X .002 INT STAR SLEEVING FIBERGLASS 7/16 SCREW TAPTITE 6-32 X 1/4 PH PAN BLK CONTROL PCB ASSY SPACER 4 X 1/4 KEP NUT 4-40 CADMIUM PLATE TONE PCB ASSY METER FILTER PALE BLUE LIGHT BOX PLASTIC LAMP PCB ASSY RIVET NYLON POP-IN DUST COVER TOP COVER DECAL SCREW MACH 8-32 X 3/8 PH TRUSS HD SCREW MACH SEMS 6-32 X 1/4 PH PAN CHASSIS OUTPUT TRANSFORMER POWER TRANSFORMER DECAL OUTPUT TRANSFORMER DECAL POWER TRANSFORMER 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 018691 084194 112087 749665 414118 414119 401059 005188 749653 412060 401078 402003 005202 005185 084135 094401 078034 005453 004800 084189 084124 104148 104130 110009 750156 404142 101197 102006 078025 074091 404001 404004 402022 005194 400256 117487 178161 084217 005401 401250 017869 094332 005634 404072 017218 404080 400159 402020 104072 104078 410014 101222 HEATSINK ISOSTRATE SPACER PCB 1/4 HEATSINK PCB ASSY CLIP TRANSISTOR 218 CLIP TRANSISTOR 214 SCREW SM 6 X 5/8 PH PAN TYPE A SUBREAR PANEL CAPACITOR PCB ASSY SPACER #4 X 5/16 STEEL SCREW TAP 8-32 X 5/16 PH PAN NUT MACH 6-32 W/LOCK STRAP TOP COVER THERMAL PAD TAPE FOAM 1/4 X 1 3M #4504 GROMMET REAR PANEL PLATE OUTPUT BINDING POST DUAL RED-RED BINDING POST DUAL WASHER FLAT BRASS WASHER LOCK #10 SLIT PHOS/BRNZ NUT M5 X 0.8 BRASS W/GOLD PLATE MAIN PCB ASSY WASHER LOCK 2.5mm INT STAR ZINC SCREW HI/LO 4-24 X 3/8 PH RD BLK NUT MACH 10-32 W/LOCK GROMMET RUBBER 3/4 TERMINAL BLOCK AC WASHER FLAT STEEL 4 X 9/32 X .025 WASHER LOCK 5 X .255 INT STAR NUT MACH 4-40 X 3/16 X 1/16 BRACKET CHASSIS SUPPORT SEMS MS 4-40 X 3/8 CCA PAN RECEPTACLE AC LINE HOLDER FUSE 5 X 20mm IEC GROUND POST GOLD HEATSINK VENT SCREW TT 6-32 X 1/2 PH PAN SHIELD TAPE MTG DBL COATED 1/8 THK BOTTOM COVER CORD DIAL .027 FOOT BLACK PLASTIC WASHER FLAT #10 CLEAR ZINC SCREW MACH 10-32 X 3/4 PH PAN NUT MACH 6-32 SELF LOCK WASHER 1/4 IDX .408 X .18 WASHER LOCK #8 STAR NUT 4 X .7 SCREW TT SEMS 6-32 X 1/4
39
40
MA6900
REPACKING INSTRUCTIONS
41
INTEGRATED AMPLIFIER
SERVICE MANUAL
The continuous improvement of it's products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design without notice. Because of the constant upgrading of McIntosh products' circuitry and components, the Company cannot insure, and does not warrant, the accuracy of the within schematic material, which is intended for information only. McINTOSH LABORATORY, INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK 13903 Printed in U.S.A. Part Number 040809