Service Manuals, User Guides, Schematic Diagrams or docs for : . Rare and Ancient Equipment Mc INTOSH Audio MR85 hfe_mcintosh_mr85_service_en
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AM/FM TUNER
INCLUDING TM1 TUNER MODULE OPTION
CONTENTS
Performance Specifications ........................................ 2 Display Schematic and PCB .............................. 11 - 16
Notes ......................................................................... 2 Tuner Schematic and PCB ................................. 17 - 19
Rear Panel .................................................................. 3 RAA1 Schematic and PCB ........................................ 20
Section Location ........................................................ 3 Parts List ............................................................ 21 - 22
Block Diagram ........................................................... 4 Exploded View and Parts List ............................. 24 - 26
Interconnection Diagram ...................................... 5 - 6 Repacking Instructions ............................................. 27
Power Supply Schematic and PCB ...................... 7 - 10
SERVICE MANUAL
PERFORMANCE SPECIFICATIONS
FM Tuner Specifications AM Tuner Specifications
Useable Sensitivity Sensitivity
14dBF which is 1.4uV across 75 ohms 20uV External Antenna Input
50dB Quieting Sensitivity Signal To Noise Ratio
Mono: 19dBF which is 2.4uV across 75 ohms 48dB at 30% modulation
Stereo: 35dBF which is 15uV across 75 ohms 58dB at 100% modulation
Signal To Noise Ratio Harmonic Distortion
Mono: 75dB 0.5% maximum at 50% modulation
Stereo: 70dB Frequency Response
Frequency Response 50Hz to 6kHz NRSC
Mono: + 0, - 1dB from 20 to 15,000Hz Adjacent Channel Selectivity
Stereo: + 0, - 1dB from 20 to 15,000Hz 45dB minimum IHF
Harmonic Distortion Image Rejection
Mono: 0.3% at 100Hz 65dB minimum from 540 to 1600kHz
0.3% at 1,000Hz IF Rejection
0.3% at 10,000Hz 80dB minimum
Stereo: 0.45% at 100Hz
0.45% at 1,000Hz General Specifications
0.65% at 10,000Hz
Intermodulation Distortion Rated Output
Mono 0.25% Fixed output: 1.2 Volts
Stereo 0.45% Variable output: 0 - 1.2 Volts
Capture Ratio Output Impedance
1.2dB Less than 100 ohms
Alternate Channel Selectivity Power Requirements
75dB 100 Volts, 50/60Hz at 20 watts
Spurious Response 110 Volts, 50/60Hz at 20 watts
100dB 120 Volts, 50/60Hz at 20 watts
Image Response 220 Volts, 50/60Hz at 20 watts
75dB 230 Volts, 50/60Hz at 20 watts
240 Volts, 50/60Hz at 20 watts
RF Intermodulation Note: Refer to the rear panel of the MR85 for the correct voltage.
65dB Dimensions
Stereo Separation 17-1/2" (44.5cm) W, 5-3/8" (13.7cm) H, 17-1/2" (44.5cm) D,
45dB at 100Hz (including clearance for connectors)
45dB at 1,000Hz Weight
35dB at 10,000Hz 25.5 pounds (11.6 kg) net, 43 pounds (19.5 kg) in
shipping carton
SCA Rejection
65dB
NOTES
1. The heavy notes on the schematic denote the primary 4. On PC board drawings, Square pad indicates:
signal path. a. Polarized Capacitors - Positive
b. Diodes - Cathode
2. Unless otherwise noted, all voltages indicated on the c. Others - Pin 1
schematics are measured under the following conditions:
a. AC input at 120 volts, 50/60Hz. 5. WARNING
b. All voltages are +/-10% with respect to ground. A Parts marked with the symbol have critical
high impedance (10 megaohm) voltmeter must be used. characteristics. Use only replacement parts recom-
mended by the manufacturer.
3. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH). 2
MR85
REAR PANEL
SECTION LOCATION
TOP VIEW WITH COVER REMOVED
3
BLOCK DIAGRAM
4
MR85
INTERCONNECT
5 6
2 POWER SUPPLY 049410
7 8
MR85
2 POWER SUPPLY 049410
9 10
3 DISPLAY 049409 1 0F 2
11 12
MR85
3 DISPLAY 049409 2 0F 2
13 14
3 DISPLAY 049409
15 16
MR85
4A 4B TUNER 049084
17 18
4A 4B TUNER 049084 5A 5B RAA1 049084
19 20
MR85
PARTS LIST
PART NO DESCRIPTION REF NO
INTERCONNECT 144101 RES MF 11K 1% 1/4W R11
171320 SWITCH CABLE ASSY 144103 RES 16.5K 1% 1/4W R29 R31
117711 AC INPUT LINE FILTER EM1 144112 RES MF 82.5K 1% R12
089101 FUSE, 250mA SLO-BLO 5 X 20 F1 144113 RES MF 100K 1% 1/4W R2 R3 R9 R41
159327 MR85 POWER TRANSFORMER T1 144154 RES MF 12.1K 1% 1/4W R26
074091 AC TERMINAL BLOCK TB1 144157 RES MF 10 1% 1/4W R1
144172 RES MF 221 1% 1/4W R4 R8
049410 POWER SUPPLY PCB 144181 RES MF 18.2K 1% 1/4W R25
003611 CARD MOUNTING BRACKET BRKT1 144187 RES MF 22.1K 1% 1/4W R15 R23 R49
BRKT2 144191 RES MF 1.21K 1% 1/4W R14
061268 MONO CAP .1UF, 50V, Z5U C1 C2 C3 141196 RES CF 100 5% 1/4W R17 R20 R33
061273 220PF 5% 100V NPO C8 R35
061277 MONO CAP 0.1MF 20% 50V C4 C5 C6 C7 144262 RES NETWORK 2X220K ISO R57 R60
064307 CAP M POLY .0039UF 5% 100/250VDC C21 C22 144273 RES MF 182 1/4W 1% R6 R7
064312 CAP M POLY .01UF 5% 63VDC C19 C23 C24 144323 RESNET 3 X 220K OHM BUSSED R53
064314 CAP M POLY .015UF 5% 63/250VDC C20 144364 RES MF 475K 1% 1/4W R40
064316 CAP M POLY .022UF 5% 63VDC C18 144366 RES NETWORK ISOLATED 2X22K R56 R58 R59
064338 CAP M POLY 0.1MF 100V C16 C17 R61
066161 CAP ELECT 100UF 25V-50V C10 C11 C12 144442 RES MF 47.5 1% 1/4W R19 R21 R34
066214 CAP ELECT 22UF 100V RADIAL C13 R36
066215 CAP ELECT 47UF 50V C42
066221 CAP ELECT 10UF 50V SINGLE END C35 C36 C37 049409 DISPLAY PCB
066278 CAP ELECT 47MF 100V 20% C32 058109 LED, SQUARE TYPE(RED) DS4 DS5
066344 CAP ELECT 100UF 25V C41 058150 MX132 12 CHARACTER DISPLAY DS1
066360 CAP ELECT 3300UF 35V C9 058153 INCANDESCENT LAMP 14V 100MA LAMP1 LAMP2
066404 CAP ELECT 1000MF 16V C15 LAMP3 LAMP4
066443 CAP ELECT 4700MF 35V C14 LAMP5 LAMP6
066469 CAP ELECT 470UF 50V C33 C34 LAMP7 LAMP8
066506 CAP ELECT 22UF 100V C46 C48 C49 058155 PHOTO MICROSENSOR DETECT1
C50 C51 C52 DETECT2
066510 CAP ELECT 1UF 50V C40 061262 MON CER 0.001MF 100V NPO C4 C5 C6 C8
070047 SILICON DIODE 1N4148 T&R D12 D15 D16 C10 C11 C12
D17 D18 D19 C13 C23 C40
D20 D25 061268 MONO CAP: .1UF,50V,Z5U C33 C34 C35
070085 DIODE ZENER 6.2V 5% 500MW D11 C36 C38
070121 DIODE ZENER 33V 5% 1/2W D3 061277 MONO CAP 0.1MF 20% 50V C1 C2 C3
070131 DIODE RECTIFIER D1 D2 D4 D5 061285 MONO CAP 33PF C45 C46
D7 D8 D9 D10 064320 CAP M POLY .047UF 5% 63/100VDC C41
D13 D14 064325 CAP M POLY .1UF 5% 63VDC C42
070132 DIODE ZENER 5V D6 064333 CAP M POLY .47UF 5% 50/63VDC C43
080017 TO-220 HEATSINK IC11 066215 CAP ELECT 47UF 50V C27 C28 C32
087050 REED RELAY FORM 1A, 5V, 500 OHMS K3 K4 K5 K6 066221 CAP ELECT 10UF 50V SINGLE END C29 C30 C31
087057 RELAY K1 K2 070047 SILICON DIODE 1N4148 T&R D6 D7
089088 FUSE 2A SLO-BLO 5 X 20 250VIEC F3 070061 ZENER DIODE:15V,1W D4
117215 4-PIN CONNECTOR J2- J9- 070093 LED LAMP RED DS2 DS3 DS6
117217 MALE CONN: 7 PIN J1- J10- DS7 DS8
117218 MALE CONN 6-POS FRICTION LK J3- J4- J5- J6- 117218 MALE CONN 6-POS FRICTION LK J1- J2- J3- J4-
J7- J8- 132223 TRANSISTOR NPN MPS4124 2K/REEL Q2
117450 PHONE JACK 4P RCA GOLD PLATED J20 J21 132224 TRANSISTOR PNP Q1
117549 HEADPHONE JACK DUAL BLACK 1/8 J22 J23 133186 IC SHFT REG SER-PAR IC6
117708 FASTON BLADE W/FEET J11 J12 J13 133192 IC NAND SCHMIT 2-IN X 4 IC4
J14 J15 J16 133249 IC CMOS EPROM IC2
J17 J18 J19 133347 VF ALPHANUMERIC CONTROLLER IC5
132090 TRANSISTOR NPN DAR MPSA25 Q1 133366 IC 8 BIT A/D SERIAL OUTPUT IC3
132223 TRANSISTOR NPN MPS4124 2K/REEL Q2 Q3 133408 PROGRAMMED MICRO MR85 V1.00 IC14
133114 IC AUDIO PROCESSOR U3 137042 FLAMEPROOF RES 47 OHM 5% 1/4W R12
133119 IC REGULATOR +12 VOLT IC11 144053 RES MF 10K 1% 1/4W R6 R9 R10
133175 IC AND 2 INPUT X 4 IC2 IC3 IC6 144090 RES MF 1K 1% 1/4W R2 R42
133186 IC SHFT REG SER-PAR IC1 144108 RES MF 47.5K 1% 1/4W R19
133192 IC NAND SCHMIT 2-IN X 4 IC7 144113 RES MF 100K 1% 1/4W R25
133306 NEG 24V REGULATOR IC10 144157 RES MF 10 1% 1/4W R11 R16 R24
133342 IC QUAD ANALOG SWITCH HI SPEED IC4 IC5 144172 FF RES 221 1% R8
133365 IC 5V 1.5A REGULATOR LOW DROP IC12 144187 RES MF 22.1K 1% 1/4W R20 R26 R28
134495 POTENTIOMETER DUAL 20K TAPPED R54 R55 144196 RES MF 100 1% 1/4W R7
137002 RES FP 1.1 OHM 1/4W 5% R18 144250 RES NETWORK 9 X 47K BUS R14 R21 R23
137025 FLAMEPROOF RES: 10 OHMS 5% 1/4W R13 144253 RES NET 10K X8 RES B R5
139005 WIRE RES: 2 OHMS 10% 5W R52 144254 RES NETWORK 5X47K BUSSED R22
144053 RES MF 10K 1% 1/4W R16 R22 R27 144259 RES NETWORK 4 X 100 ISO R45
R28 R30 144263 RES NETWORK 8X330 ISO R30
144090 RES MF 1K 1% 1/4W R5 R24 R50 144280 RES NETWORK 9X1K ISO R1 R3 R4
144097 RES MF 4.75K 1% 1/4W R10 R51 144298 RES MF 2.21K 1% 1/4W R27
21
PARTS LIST
144351 1.74K 1% 1/4W MF RES R17 133189 IC OPERATIONAL AMPLIFIER IC4 IC5
144366 RES NETWORK ISOLATED 2X22K R31 133231 LA1175 FM FRONT END IC1
150058 TACT SWITCH S1 S2 S3 S4 133270 IC DIRECT PLL FREQ SYNTHESIZER IC3
S5 S6 S7 S8 133381 AM-FM MPX TUNER IC IC2
S9 S10 134406 TRIMPOT 22K R70
178133 40-PIN IC SOCKET IC14 134414 POTENTIOMETER: 10K OHM R71 R73
180051 CRYSTAL 11.0592MHZ Y1
141025 RES CF 100 5% 1/4W R4 R14 R21
049084 TUNER/RAA1 PCB R60
060027 TRIM CAP: 2-10PF C59 C60 C62 141033 RES CF 220 5% 1/4W R54 R65
C63 141037 RES CF 330 5% 1/4W R23 R26
060029 3-27PF TRIMMER CAPACITOR C61 C64 C65 141041 RES CF 470 5% 1/4W R103
C106 141049 RES CF 1.0K 5% 1/4W R3 R5 R7 R30
061002 DISC CAP: 1.8PF+/-.25PF NPO C35 R38
061249 DISC CAP: .47UF 50V MONOLITHIC C50 C70 C71 141057 RES CF 2.2K 5% 1/4W R39 R46
C72 141060 RES CF 3.3K 5% 1/4W R63
061256 M.CAP: 470PF,5%,100V C39 141064 RES CF 4.7K 5% 1/4W R22 R24 R33
061257 360PF 5% 100V C21 R35 R69
061273 220PF 5% 100V NPO C76 C77 C78 141072 RES CF 10K 5% 1/4W R1 R11 R15
C79 R19 R29 R41
061275 MONO CAP: 100PF,5%,100V,NPO C2 C6 C12 R44 R50 R64
C14 C17 R68 R75 R101
061277 MONO CAP 0.1MF 20% 50V C1 C4 C7 C11 R102 R105
C19 C20 C26 141076 RES CF 15K 5% 1/4W R6 R20 R40
C27 C29 C30 141080 RES CF 22K 5% 1/4W R17 R52 R55
C34 C102 R58
C104 C105 141088 RES CF 47K 5% 1/4W R8 R9 R13
061282 22PF 10% 100V CAPACITOR C8 C24 R18
061286 MONO CAP .047UF 10% 50V RADIA C10 C13 C15 141096 RES CF 100K 5% 1/4W R56 R61 R76
C16 C18 C28 141116 RES CF 680K 5% 1/4W R27 R28
C33 C75 141124 RES CF 2.2M 5% 1/4W R16 R42
061287 MONO CAP .0022UF 10% 50V RADI C5 C23 C25 141144 RES CF 22 5% 1/4W R67 R104
C31 C74 C103 141152 RES CF 47 5% 1/4W R51 R74
061288 MONO CAP 10PF 10% 100V C3 C9 C22 144097 METAL FILM RES: 4.75K 1% 1/4W R32 R43 R45
C32 R53
064310 M POLY CAP:.0068MF,10%,63V DC C82 C83 144121 METAL FILM RES: 2.67K 1% 1/4W R47 R48
064314 M POLY CAP:.015UF,5%,63V DC C36 C40 144142 METAL FILM RES 2.87K 1% 1/4W R10 R25
064316 M POLY CAP:.022UF,5%,63V DC C80 C81 162102 TRANSFORMER: QUAD DET PRIM T9
064318 M POLY CAP:.033UF,5%,63V DC C37 C41 C42 162103 TRANSFORMER: QUAD DET SEC T8
C43 162113 TRANSFORMER (MATCHING) T7
064320 M POLY CAP:.047UF 5% 63VDC C38 162114 10.7MHZ MIXER TRANSFORMER T10
064329 M POLY CAP 0.22UF 5% C73 162115 AM OSC. COIL T11 T101
066269 CAP ELECT 1UF 10% 50V C57 C58 162117 AM RF TRANSFORMER T12
066445 ELECT CAP 10MF, 50V AMMO PACK C45 C46 C47 180036 CRYSTAL 7.2MHZ Y1
C48 C49 C51 180046 CERAMIC RESONATOR 450KHZ Y2
C52 C54 C55 180055 FILTER 450KHZ FN6
066446 ELECT CAP 47MF, 35V AMMO PACK C53 180056 FILTER CERAMIC 10.7MHZ FN1 FN2 FN3
066447 ELECT CAP 100MF 16V AMMO PACK C56 C67 C68
C69 049106 SWITCH PCB
070047 SILICON DIODE 1N4148 T&R D10 D102 117670 CONNECTOR 3-PIN RIGHT ANGLE J1-
D103 D104 146249 SWITCH PULSE ROTARY S1
070122 (8) DIODE TUNING ALL 8 DIODES USED
ON JAPANESE VERSION D1 D2 D3 D4
(D5 D6 D7 D8)
070125 TUNING DIODE D11 D12 D101
117213 2-PIN MALE CONNECTOR J6
117223 MALE CONN: 6 PIN RT. ANGLE J3
117240 4 PIN RT. ANGLE J5
117319 CONN, RT.ANGLE, MALE, 7 POS J4
117383 DIN CONN 7-PIN J2
117661 GOLD F CONNECTOR RIGHT ANGLE J1
117677 HEADER 5 PIN J101-
122229 RF CHOKE: 3.3UH, 10% L1
122249 ANT. COIL L4 L5
122250 MIXER COIL L2 L3
132178 TRANSISTOR: RF FET, J-310 FET Q102
132220 TRANSISTOR: 1-4V,PNC OFF 250 OH Q8 Q101
132223 TRANSISTOR NPN MPS4124 2K/REEL Q3 Q5 Q6 Q7
Q10 Q11 Q12
132224 TRANSISTOR PNP SI MPS4126 2K/R Q2 Q9
132256 #3SK114Y (Q1) D MOS FET Q1
133147 MC78L08ACP +8V REG IC6
22
MR85
NOTES
23
EXPLODED VIEW PARTS LIST
Ref. Part
No. No. Description
1 016419 FRONT GLASS
2 171320 C/A SWITCH
3 017531 PUSHBUTTON ASSY RED
4 017517 PUSHBUTTON ASSY
5 078033 O-RING
6 049411 KNOB ASSY
7 104073 BLK FELT WASHER
8 018611 5" ENDCAP
9 101042 TS 4-40 X 1/2 SLOT FILLISTER
10 094360 FOAM TAPE 1/2 X1/2
11 004810 EXTRUSION BRACKET 5"
12 018609 BOTTOM EXTRUSION
13 101172 TCS 6-32 X 1/4 PHIL FLAT U/C
14 100147 MS 6-32 X 3/16 PHIL FLAT U/C
15 018587 TOP EXTRUSION
16 022314 LED SHIELD
17 017806 PLEXIGLAS LOWER
18 017805 PLEXIGLAS UPPER
19 017738 FRONT PANEL FILTER
21 017737 VINYL LOCATOR
22 049409 DISPLAY PCB ASSY
23 100275 MS 6-32 X 1/2 PHIL BLK TRUSS HD
24 078031 GROMMET
25 021030 SPACER: 6 X 1/4
26 110004 M7 X .75 HEX CONTROL NUT
27 104013 LK WASH: 5/16 X .435 X .002 INT STAR
28 049106 SWITCH PCB ASSY
29 021063 STANDOFF: 6-32 X 1-1/8 HEX
30 005077 SUBPANEL
31 104007 LK WASH: 6 X .288 INT STAR
32 100157 MS 6-32 X 1/4 PHIL PAN ZINC
33 005072 TRANSFORMER CAN
34 101054 TS 6-32 X 1/4 PHIL PAN TAPTITE BLK
35 102045 KEP-NUT 6-32 SPECIAL
36 078017 GROMMET 3/4 X 9/16
37 074091 AC TERMINAL BLOCK
38 104001 FLAT STEEL WASH #4 X 9/32 X .025
39 104004 LK WASH: 5 X .255 INT STAR
40 102022 MN 4-40 3/16 X 1/16
41 005073 CHASSIS TRAY
42 178160 FUSE HOLDER
43 100284 SEMS 2-56 X 1/4 PHIL PAN
44 004943 RIGHT SIDE PANEL
45 004942 LEFT SIDE PANEL
46 004940 TOP COVER
47 101078 TS 8-32 X 5/16 PHIL PAN BLK
48 004860 BOTTOM COVER
49 017218 PLASTIC FEET-BLACK
50 104080 FLAT WASHER #10 CLEAR ZINC
51 100159 MS 10-32 X 3/4 PH PAN BLK ZINC
52 049410 POWER PCB ASSY
53 049084 TUNER ASSY/RAA1
54 004903 TUNER COVER
55 101097 TS 6-32 X 3/16 PHIL PAN TAP
56 005070 REAR PANEL
57 117711 AC RECEPT WITH LINE FILTER
58 102001 KEP NUT 4-40 CADMIUM PLATE
59 102020 MACH NUT: 6-32 SELF-LOCK
60 005078 REAR PANEL PLUG
61 100250 SEMS MS 6-32 X 1/4 PHIL PAN
62 101114 SM 4-24 X 1/2 PHIL PAN TYPE A
63 101109 TS 6-32 X 5 /16 PHIL PAN TAPTITE
24
EXPLODED VIEW
25 26
REPACKING INSTRUCTION
AM/FM TUNER
INCLUDING TM1 TUNER MODULE OPTION
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 040724
27
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