Service Manuals, User Guides, Schematic Diagrams or docs for : . Rare and Ancient Equipment Mc INTOSH Audio C2300 hfe_mcintosh_c2300_service_ya1001
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C2300
C2300
TUBE PREAMPLIFIER
SERIAL NO. YA1001 And Above
CONTENTS
Performance Specifications ..........................................2 Balanced Schematic and PCB .............................29 - 34
Notes...........................................................................2 Tube Schematic and PCB ....................................35 - 42
Rear Panel ...................................................................3 Data Schematic and PCB ....................................43 - 46
Section Location ..........................................................3 Pushbutton Schematic and PCB ..........................47 - 48
Block Diagram ............................................................4 Headphone Schematic and PCB .........................49 - 50
Interconnection Diagram ........................................5 - 6 Meter Lamp Schematic and PCB.........................51 - 52
Main Schematic and PCB .....................................9 - 22 Parts List .............................................................53 - 62
Display Schematic and PCB................................23 - 28 Repacking Instruction ................................................63
SERVICE MANUAL
PERFORMANCE SPECIFICATIONS
General Specifications Output Impedance
220 ohms
Frequency Response
+0, -0.5dB from 20Hz to 20,000Hz Headphone Load Impedance
+0, -1dB from 10Hz to 100,000Hz 16 ohms to 250 ohms
Total Harmonic Distortion Tube Compliment
0.08% from 20Hz to 20,000Hz MM Phono Circuitry: 2 - 12AX7A
MC Phono Circuitry: 2 - 12AX7A
Rated Output (Main)
High Level Circuitry: 2 - 12AX7A
2.5V Unbalanced, 5V Balanced
Power Requirements
Maximum Voltage Output
100 Volts, 50/60Hz at 75 watts
8V RMS Unbalanced, 16V RMS Balanced
110 Volts, 50/60Hz at 75 watts
Sensitivity (for rated output) 120 Volts, 50/60Hz at 75 watts
High Level, 450mV unbalanced, 900mV balanced 220 Volts, 50/60Hz at 75 watts
Phono MM, 4.5mV 230 Volts, 50/60Hz at 75 watts
Phono MC, 0.45mV 240 Volts, 50/60Hz at 75 watts
Standby Power, less than 2 watts
Signal To Noise Ratio (A-Weighted)
High Level, 93dB Note: Refer to the rear panel of the C2300 for the
Phono, 80dB correct voltage.
Input Impedance Overall Dimensions
High Level, 20K ohms unbalanced, 40k ohms balanced Width is 17-1/2 inches (44.45cm)
Phono MM, 47K ohms; 50 to 750pF, in 50pF steps Height is 6 inches (15.24cm) including feet
Phono MC, 25, 50, 100, 200, 500 or 1,000 ohms; 100pF Depth is 18 inches (45.72cm) including the Front Panel,
Knobs and Cables
Maximum Input Signal
High Level, 5V Unbalanced, 10V Balanced Weight
Phono MM, 50mV 29.5 pounds (13.41 kg) net, 44.9 pounds (20.41 kg) in
Phono MC, 5mV shipping carton
Voltage Gain Shipping Carton Dimensions
High Level to SRVR(REC) Output: 0dB Width is 25 inches (63.5cm)
High Level to Main Output: 15dB Depth is 27 inches (68.6cm)
Phono MM to Record Output: 40dB Height is 12 inches (30.5cm)
Phono MC to Record Output: 60dB
NOTES
1. The heavy lines 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 condi-
tions: 5. WARNING
a. AC input at 120 volts, 50/60Hz. Parts marked with the symbol have critical
b. All voltages are +/-10% with respect to ground. A characteristics. Use only replacement parts recom-
high impedance (10 megaohm) voltmeter must be mended by the manufacturer.
used.
6. Use McIntosh Remote Control Model HR061 with the
C2300.
3. Unlessotherwisespecified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).
2
C2300
REAR PANEL
SECTION LOCATION
3
BLOCK DIAGRAM
4
C2300
1 INTERCONNECT
5 6
NOTES
7 8
C2300
2A MAIN 750761 SCH 1 OF 6
R74 R79
1.5k 1.21k
15V
220uF
1000uF
C 50
C 46
1
1
0V 0V
2 2 .1
R 70
R59 R66 R88
Q11 4.75k Q15 4.75k C56 2.21
3 3
MC3 MC4 R82 22pF 15V
475
10uF
.1 u F
C 58
C 60
1000pF
2
2
5
0V 0V
C 42
1
1
1
1
1
.6V .6V 3
8
Q19 Q23 .6V Q27 .6V Q31 .6V Q35 +
0V
7
0V 2 0V 2 0V 2 0V 2 0V 2 R92
R 54
MC OUT
110
1k J2:1 LEFT MC
5 1 .1
R 62
6
U8 3B J4:12
0V 0V
3
3
3
3
3
J1
0V 0V 0V 0V 0V 0V
1 2 R89
4
L -
2.21
0V
1
-15V
3
3
3
3
3
100pF
.1 u F
C 41
C 61
1000pF
R 55
R 63
249
2 .2 1 k
1k
0V 2
R 52
R 86
C 54
0V 2 0V 2 0V 2 0V 2
1k
1000pF
Q21 Q25 Q29 Q33 Q37
C 43
R83
1
1
1
1
1
0V 475
0V .6V .6V .6V .6V .6V
2
2
R58 R67
4.75k 4.75k
3 3
2 2 .1
R 71
MC1 MC2
Q12 Q16
R75 R78
0V 0V 1.5k 1.21k
1
1
-15V J2:3 GND
1000uF
3B J4:10
C 47
220uF
C 51
MC PH J2:4 GND
3B J4:9
INPUTS
TO TUBE
R76 R80
1.5k 1.21k
15V
1000uF
220uF
C 48
C 52
1
1
2 2 .1
R 72
0V R61 0V R68 R90
Q13 4.75k Q17 4.75k C57 2.21
3 3
MC3 MC4 R84 22pF 15V
475
10uF
.1 u F
C 59
C 62
1000pF
2
2
0V 0V
5
C 44
1
1
1
1
1
.6V .6V .6V .6V .6V 0V 3
8
Q20 Q24 Q28 Q32 Q36 +
7
2 2 2 2 2 R93
R 56
MC OUT
110
1k J2:2 RIGHT MC
5 1 .1
R 64
6
0V 0V U9 3B J4:11
0V 0V 0V 0V 0V
3
3
3
3
3
J1
0V
2 2 R91
4
R -
2.21
1
0V -15V
3
3
3
3
3
100pF
0V 0V 0V 0V
.1 u F
C 40
C 63
1000pF
R 57
R 65
249
2 .2 1 k
1k
0V
R 53
R 87
C 55
2 2 2 2 2
1k
1000pF
Q22 Q26 Q30 Q34 Q38
C 45
R85
1
1
1
1
1
475
.6V .6V .6V .6V .6V
0V 0V
2
2
R60 R69
4.75k 4.75k
3 3
2 2 .1
R 73
MC1 MC2
Q14 Q18
0V 0V R77 R81
1.5k 1.21k
1
1
-15V
1000uF
C 49
220uF
C 53
9 10
2B MAIN 750761 SCH 2 OF 6
DECODER
POWERON U4
16 14 R43
100k
5V VCC DATA SDATA
R41
11 1k
R6 DRIVER SCLK SCLK
1
1
10k U2 10
Q3 3 Q7 3 RESET 5V
MM3 MM4 9 R44
18 1 5V 15 SQH 1k
10k TO J33 PIN3 QA 12
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