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CONTENTS Amplifier 11-14 Performance Specifications 3 Notes 3 Control and Balance Control 14-18 Rear Panel 4 Treble 19 Bass 20 Front Panel and Trim Parts List 4 Section Locations 5-6 Speaker Switch 21 Block Diagram 5-6 AC Power Supply 22 Interconnection Diagram 6-9 DC Power Supply 23 Repacking Instructions 24 Input/Output (Left and Right) 10-12
Mclntosh Laboratory, Inc. 2 C h a m b e r s Street, Binghamton, New Y o r k 13903 Printed
Performance Specifications
FREQUENCY RESPONSE + 0, -0.5dB from 20Hz to 20,000Hz RATED OUTPUT 2.5V at MAIN and SWITCHED 1 and 2, and BALANCED OUTPUTS MAXIMUM VOLTAGE OUTPUT More than 8V at all outputs TOTAL HARMONIC DISTORTION 0.002% maximum IHF, 0.2% maximum from 20Hz to 20,000Hz at rated output SENSITIVITY Phono: 2.2mV for 2.5V rated output, (0.45mV IHF) High Level: 250mV for 2.5V rated output, (50mV IHF) SIGNAL-TO-NOISE RATIO, A-WEIGHTED Phono: 80dB below 10mV input High Level: 90dB below rated output VOLTAGE GAIN Phono To Tape: 41 dB at 1000Hz Phono To Main: 61 dB at 1000Hz High Level To Tape: 0dB High Level To Main: 20dB INPUT IMPEDANCE Phono: 47K ohms and 65pF Capacitance High Level: 22K ohms TONE CONTROLS Bass and Treble stepped, 20dB boost to 20dB cut AC POWER OUTLETS 4 switched and 1 unswitched, Total capacity 1400 watts POWER REQUIREMENTS 120V, 50/60Hz, 37 watts DIMENSIONS Front Panel: 16 inches (40.6cm) wide by 5-7/16 inches (13.8cm) high. Chassis depth behind mounting panel, including clearance for connectors: 14 inches (35.6cm). Knob clearance required in front of mounting panel: 1-1/2 inches (3.8cm). FINISH Anodized gold and black front panel, chassis is black. WEIGHT 16 pounds (7.3Kg) net, 25 pounds (11.4Kg) in shipping carton
Notes
1. The four types of heavy lines on the schematics denote the primary signal path in the following manner: = LEFT CHANNEL = RIGHT CHANNEL = LEFT BALANCED = RIGHT BALANCED 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 megohm) voltmeter must be used. 3. Unless otherwise specified: a. Resistor values are in ohms. b. Capacitor values are in microfarads (uF). 4. The voltages enclosed in a box are signal voltages that are measured with a 2.2mV, 1kHz signal connected to both channels at the PHONO 1 INPUT JACKS.
3
FRONT PANEL CONTROLS are set at: BALANCE CENTER DETENT BASS and TREBLE CENTER DETENT INPUT SELECTOR PHONO 1 LOUDNESS NORMAL MODE STEREO POWER ON VOLUME CLOCKWISE TAPE MONITOR 1 and 2 NORMAL RUMBLE and HF FILTERS FLAT SPEAKERS 1&2 5. On PC Board Drawings, Square Pad Indicates: a. Polarized Capacitors - Positive b. Diode - Cathode c. Others - Pin 1 6. WARNING: Parts marked with the symbol have critical characteristics. Use ONLY replacement parts recommended by the manufacturer.
Rear Panel
Fig. 1 Rear view
FRONT PANEL and TRIM PARTS LIST Symbol 016340 016334 018511 018512 018520 018521 C22-FrontPanel 090242 090243 090244 101035 104143 104144 Description Indicator Glass Front Panel Glass Top Panel Extrusion Lower Panel Extrusion End Cap Left End Cap Right Front Panel Complete W/Glass Input/Mode Knob Balance/Volume Knob Bass/Speaker/Treble Knob Screw, 4-40 x 5/16 Fill Head Felt Washer 3/4" Dia Felt Washer 5/8" Dia
4
Section Locations
Block Diagram
INTERCONNECTION PARTS LIST Symbol CAPACITORS C1.C2 JACKS J2,J3 J4,J5 Part 061276 Description DISC CAP, .0047uF, 400VAC Phone Jack XLR Connector, Male Lamp Fuse Style Lamp Disc Indicator Slide Switch (SPDT) Power Transformer
117563 117437
LIGHTING DEVICES DS1.DS2 058138 DS3.DS4 058137 SWITCHES S1-S6 148068
TRANSFORMERS T1 159248
5
6
Interconnection Diagram
7
8
9
Input/Output, Left and Right
INPUT/OUTPUT PARTS LIST
Symbol
RELAYS K1,K7,K9, K11,K12
K2-K6.K8, K10,K13-K16
LEFT INPUTS/OUTPUTS PCB 048481 AND RIGHT INPUTS/OUTPUTS PCB 048476
Description
Form 1C, 5VDC, Reed, HE3321C0500 SPST. 5VDC, Reed, HE3321A0400
AMPLIFIER PARTS LIST
Symbol
RELAYS K1-K4 DIODES D1.D2
TRANSISTORS Q1
Part
087056
Part
087056
Description
Form 1C, 5VDC, Reed, HE3321C0500 Zener: 51V, 5%, 400mW
087050
070102
132248
NPN, 300V, 2SC3790D or E
AMPLIFIER PCB 048474
10
11
12
NOTE: Components and values toned in gray warrant your attention; parenthesized values apply to serial numbers L K 1 0 0 1 - L K 1 9 8 9 . nonparenthasized values apply to serial numbers LK1990 and above.
Amplifier
13
14
Control and Balance Control
15
16
Control and Balance Control
BALANCE CONTROL PCB 048478
CONTROL PCB 048479
BALANCE CONTROL PARTS LIST
Symbol Part Description
CONTROL PARTS LIST
Symbol DIODES D1-D32 Part Description
RESISTORS and POTENTIOMETERS R1 134475 Balance Control
070047
SIG, 75V, 150mA, 1N4148
INTEGRATED CIRCUITS IC1 133189 IC2 133108 RELAYS K1-K3
Dual Op-Amp. MC33178P 5V Regulator MC7805CT
087050
SPST, 5VDC, Reed, HE3321A0400
RESISTORS R1 SWITCHES S1 S2 TRANSISTORS Q1,Q2
134476
Volume Control
146238 146239
Input Switch Mode Switch
132224
PNP, MPS4126
17
18
Treble
Bass
TREBLE PARTS LIST Symbol SWITCHES S4.S5 Part 146240 Description Bass/Treble Switch
BASS PARTS LIST Symbol SWITCHES S1.S2 Part 146240 Description Bass/Treble Switch
TREBLE PORTION OF PCB 048477
19
20
BASS PORTION OF PCB 048477
Speaker Switch
SPEAKER SWITCH PARTS LIST Symbol DIODES D1-D6 SWITCHES S3 Part 070047 146241 Description SIG DIODE 1N4148 Speaker Switch
SPEAKER SWITCH PORTION OF PCB 048477
21
WARNING: Parts located in the below shaded area have critical characteristics. Use ONLY replacement parts recommended by the manufacturer.
AC POWER SUPPLY PORTION OF PCB 048471
AC POWER SUPPLY PARTS LIST
Symbol CAPACITOR C9 FUSES F1 RELAYS K1 Part 061276 089081 087054 Description Disc Cap, .0047uF, 400VAC Fuse 1A, 2AG SPST,12VDC
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DC Power Supply
WARNING: Parts located in the below shaded area have critical characteristics. Use ONLY replacement parts recommended by the manufacturer.
NOTE: Components and values toned in gray warrant your attention; parenthasized values apply to serial numbers LK1001-LK1989, nonparenthasized values apply to serial numbers LK1990 and above.
DC POWER SUPPLY PARTS LIST
Symbol DIODES D1.D2 Part 070044 Description BRIDGE, 400V, 2A
DC POWER SUPPLY PORTION OF PCB 048471
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Repacking Instructions
In the event it is necessary to repack the unit for shipment, the unit must be packed exactly as shown below. IMPORTANT - The four plastic feet must be attached to the bottom of the unit so they will locate in the four holes of the bottom pad. Failure to do this will result in shipping damage. If a shipping carton or any of the interior parts is needed, please call or write the Customer Service Department of Mclntosh Laboratory. Order parts from the accompanying list by part number. Use the original shipping carton and interior parts only if they are in good serviceable condition.
Qty.
1 2
Part No. 033870 033884 033883 033885 033886 017156 100160 104080 033915
Description Shipping carton only Corner pad Inside carton only Top pad Bottom pad Plastic foot #10-32 x 9/16" Screw #10 Flat washer Shipping carton complete with all the above parts
1 1 1
4 4 4
1
TOP PAD
INSIDE CARTON
UNIT WITH (4) FEET ON BOTTOM COVER 10-32x9/16" SCREW WITH WASHER (4)
CORNER PAD
BOTTOM PAD
SHIPPING CARTON
INSIDE CARTON
C22 PREAMPLIFIER
Mclntosh Laboratory, Inc., 2 Chambers Street, Binghamton, NY 139O3
Telephone (607) 723-3512 Printed in U.S.A. Part No. 040354
BE032003