McIntosh C2500 Manuel utilisateur

C2500

SERVICE MANUAL

Performance Speciﬁcations..........................................2

Notes...........................................................................3

Rear Panel ...................................................................4

Section Location..........................................................4

Block Diagram .......................................................5 - 6

Interconnection Diagram........................................7 - 8

Display Schematic and PCB..................................9 - 18

Control Schematic and PCB................................19 - 30

Audio Schematic and PCB..................................31 - 42

Balanced I/O Schematic and PCB.......................43 - 46

Digital Audio Schematic and PCB.......................47 - 54

Backup PS Schematic and PCB...........................55 - 58

Power Schematic and PCB..................................59 - 62

Tube Schematic and PCB....................................63 - 70

Audio Expansion Schematic and PCB ................71 - 74

Meter Light Schematic and PCB..........................75 - 76

Parts List .............................................................77 - 92

Repacking Instruction ................................................ 93

CONTENTS

TUBE PREAMPLIFIER

SERIAL NO. ADF1001 And Above

C2500

PRELIMINARY

PERFORMANCE SPECIFICATIONS

Specications

Frequency Response

+0, -0.5dB from 20Hz to 20,000Hz

+0, -3dB from 10Hz to 100,000Hz

Total Harmonic Distortion

0.08% from 20Hz to 20,000Hz

Rated Output (Main)

2.5V Unbalanced, 5V Balanced

Maximum Output

8V RMS Unbalanced, 16V RMS Balanced

Sensitivity (for rated output)

High Level, 450mV unbalanced, 900mV balanced

Phono MM, 4.5mV

Phono MC, 0.45mV

Signal To Noise Ratio (A-Weighted)

High Level, 100dB below rated output

Phono MM, 75dB below 5mV input

Phono MC, 75dB below 0.5mV input

Input Impedance

High Level, 22K ohms unbalanced, 44k ohms balanced

Phono MM, 47K ohms; 50 to 750pF, in 50pF steps

Phono MC, 25, 50, 100, 200, 400 or 1,000 ohms;

100pF

Maximum Input Signal

High Level, 8V Unbalanced, 16V Balanced

Phono MM, 80mV

Phono MC, 8mV

Voltage Gain

High Level to Record Output: 0dB

High Level to Main Output: 15dB

Phono MM to Record Output: 40dB

Phono MC to Record Output: 60dB

Output Impedance

220 ohms

Headphone Impedance

20 ohms to 600 ohms

Digital Input Sample Rates

Optical: 16Bit, 24Bit - 32kHz to 96kHz

Coaxial: 16Bit, 24Bit - 32kHz to 96kHz

USB: 16Bit, 24Bit, 32Bit - 32kHz to 192kHz

Power Control and Trigger Output

12VDC, 25mA

Power Requirements

Field AC Voltage conversion of the C2500 is not possible.

The C2500 is factory congured for one of the following AC

Voltages:

100 Volts, 50/60Hz at 50 watts

110 Volts, 50/60Hz at 50 watts

120 Volts, 50/60Hz at 50 watts

220 Volts, 50/60Hz at 50 watts

230 Volts, 50/60Hz at 50 watts

240 Volts, 50/60Hz at 50 watts

Standby Power, less than 0.5 watts

Note: Refer to the rear panel of the C2500 for the correct voltage.

Overall Dimensions

Width is 17-1/2 inches (44.45cm)

Height is 7-5/8 inches (19.37cm) including feet

Depth is 18 inches (45.72cm) including the Front Panel,

Knobs and Cables

Weight

30.5 pounds (13.8 kg) net, 46 pounds (20.9 kg) in shipping

carton

Shipping Carton Dimensions

Width is 27 inches (68.6cm)

Height is 14 inches (35.6cm)

Depth is 25 inches (63.5cm)

NOTES

C2500

REAR PANEL

SECTION LOCATIONS

TOP VIEW WITH COVER REMOVED

BOTTOM VIEW WITH COVER REMOVED

DISPLAY

PCB

CONTROL

PCB

DIGITAL

AUDIO

PCB

BACKUP PS

PCB

8POWER

PCB

AUDIO

PCB

TUBE

PCB

AUDIO

EXPANSION

PCB

BALANCED I/O

PCB

METER

LIGHT

PCB

TUBE PREAMPLIFIER

C2500

BLOCK DIAGRAM

INTERCONNECT

TUBE

8J5

J1 J2 J7

J23 J24

J26

CA24

CA25

CA18

J46

J41

J20

J16

CA26

CA27

J22

CA12

CA28

CA17

TUBE PREAMPLIFIER

C2500

910

2DISPLAY 751456 SCH 1 OF 4

GND (P in 1)

5V (Pin 2 )

SI/SO ( Pin 3)

STB (P in 4)

SCK (P in 6)

.01µFC207

.01µF

C206

DGNDDGND

VFD-GND

INPUT_B

INPUT_A

22.1

R11

47µF

IR SENSOR

Vcc

Vout

GND

MT1

.1µF

R45

3.3V

22.1KR29

22.1K

R30

22.1K

R28

22.1K

R34

3.3V BU

J9:18

J9:15

J9:12

J9:16

J9:17

J9:13

J9:10

J9:11

J9:14

J9:9

J9:6

J9:3

J9:4

J9:5

J9:7

J9:1

J9:8

J9:2

INPUT_A

INPUT_B

LEFT PB AD

VFD 5V

VFD SCL

VFD SDA

VFD CE

FRON T_IR

I2C_SCL

I2C_SDA

VFD 5V

VFD SDA

VFD SCL

.1µFC6

DGND

3.3V

.1µFC7

DGND

3.3V

3.3V BU

BYPASS

PROC

DS2 3

DS24

DS18

STANDBY/ON

MH2

ADC-VREF-L

3.3V

VFD 5V

TRIM

DS17

750932 = 058195 + 9 pin conn (117986)

Vcc

GND

Vcc

GND

SELECTOR

INPUT

GND

146261

ILLUMINATION

FRONT PANEL

DS6 DS4

150

R14

150

R19

DS2

2.21K

R16

150

R15

PANEL_LAMP

VSS

Q4 9

Q5 10

Q7 12

SDA15

SCL14

Q6 11

VDD16

NC 13

U30

22.1K

R202

22.1K

R201

22.1K

R210

22.1K

R209

3.3V BU

22.1

R211

22.1

R212

22.1K

R203

22.1K

R204

R220

R213

R214

R216

R218

Address=3

.1µF

C80

OFFON

3.3V BU

I2C_SDA

I2C_SCL

DS7

150

DS8

150

DS9

OUT1DS10

OUT2

3.3V

3.3V3.3V

PANEL_LAMP

3.3V BU

.1µF

C66

3 5

Vcc

GND

U25

47µF

C18

.1µF

C19

10µH

47µF

C23

VOL-B

VOL-A

OFFON

22.1

R69

22.1

R70

SDA (S I/SO)

CE (ST B)

SCL (S CK)

J1:2J1:7 J1:1J1:5 J1:4J1:6J1:9 J1:3J1:8

Daughter PCB

J12:12J12:11

J12:10J12:9

J12:8J12:7

J12:6J12:5

J12:4J12:3

J12:2J12:1

J11:12

J11:11

J11:10

J11:9

J11:8

J11:7

J11:6

J11:5

J11:4J11:3

J11:2J11:1

179

4 6 12

Ground

J13:4

MH1

052139 (146260)

J13:3

J13:2

J13:1

CONTROL

VOLUME

MH12

MH9

METER LEDs ON

METER MUTE

.1µF

3.3V

Vcc

GND

3.3V BU

.1µF

3 5

Vcc

GND

22.1

J7:1

J7:2

J7:3

J7:4

J7:5

J7:6

J7:7

J7:8

J7:9

J7:10

J7:11

J7:12

3.3V BU

VOL-B

ON/RESET

ADC-VREF-R

RIGHT PB AD

VOL-A

3.3V

FRONT_IR

SP1

-15V

15V

To Control PCB

J17

J16:1

J16:2

J16:5

.1µF

C119

MP2 MP1

GP1

J16:4

Tip

Ring

GND

Cable 173167, 1-1 Pinout.

Headphone daughter PCB

2X20 VFD ASSY

Left PB

Right PB VolumeLogo

Input

DS1

11 12

2DISPLAY 751456 SCH 2 OF 4

.3V

-.5V

-3.7V

.3V

-.5V

LEFT

-3.7V

LEFT

-3.7V

R115

LEFT

METER DRIVER

LEFT METER

RIGHT -

RIGHT +

LEFT -

J22:2

RIGHT

LEFT

47µF

RIGHT

.1µF

C64

R94

47µF

C65

D14

220µF

C69

D11

RIGHT

D10

D13

D12

Q39

METER DRIVER

R114

LEFT

J23:1

J23:2

LEFT +

J22:1

R95

Q40

2.21M

R110

2.21M

R111

Q44

Q43

Q45

Q46

RIGHT METER

METER BUFFER

LEFT METER

LOG CONVERTER

METER BUFFER

METER RECTIFIER

.1µF

C71

RIGHT METER

METERS

ON/OFF CONTROL

100K

R99

LOG CONVERTER

R97

B+

B-

U10:1

.1µF

C67

.1µF

C68

U11:2

100K

R98

R96

.47µF

C72

.1µF

C73

150K

R105

22.1K

R101

.47µF

C70

221

R108

METER RECTIFIER

150K

R103

22.1K

R100

METERS

ON/OFF CONTROL

U12:2

U10:2

221

R109

Q42

B+

B-

U12:1

Q41

B+

B-

U11:1

10K

R116

10K

R117

-5V

10V

10V-5V

-5V

10V

-5V

2.21

R113

15K

R38

D30

2.21

R112

15K

R37

R249

R250

.01µF

C170

.01µF

C169

221K

R251

221K

R252

10V

-5V

R76

R77

(806 ohm)

J4:1

J4:2

J4:3

J4:4

R-METER

L-METER

TO AUDIO PCB

CABLE 173081, PIN1-1

GND

L METER

R METER

R-METER

L-METER

J41:1

J41:2

J41:3

J41:4

METER MUTE

100K

15V-15V

15V

-15V

CCW

R106

CCW

R107

OPEN

R400

TUBE PREAMPLIFIER

C2500

13 14

2DISPLAY 751456 SCH 3 OF 4

12L

12R

12L

12R

TO LEFT METER LIGHT

BLU

GRN

METER ILLUMINATION

2.21K

R71

1 3

CCW

R74

500

1 3

CCW

R73

1 3

CCW

R72

500

1 3

CCW

R75

J14:4

J15:4

J15:2

J14:7

J14:11

J14:1

J15:11

J15:7

J14:6

J14:12

J15:1

J14:9

J14:8

J15:12

J14:2

J14:5

12R

J15:5

J15:6

J15:8

J15:9

TO RIGHT METER LIGHT

DRIVER

GRN

BLU

GRN

METER LEDs ON

12R

12L

15 16

2DISPLAY 751456 SCH 4 OF 4

MUT E

OUT 1

OUT 2

Stan dby/On/R eset

Button Common

B+

B-

U1:1

U1:2

10K

R58

22.1K

R51

ON Button +

100

R12

ON/RESET

LEFT PB AD

This Transister buffers the Standby button for the A/D matrix

10µF

C3 .1µF

Vout LT

ADC-VREF-L

10K

R55

10K

R46

10K

R53

BYPASS

PRO C

TRIM

MH3

Chassis hole for Spark Ground

3.3V BU

Left Pushbutton A/D Buffer

To Right Pushbutton PCB

To Left Pushbutton PCB

SPARK GND-L

J2:1J2:5J2:3J2:4J2:6J2:2J2:10

J2:7J2:12J2:11J2:8J2:9

21A

Spar k Ground

Button CommonVout RT

ADC-VREF-R

10K

R57

10K

R13

10K

R47

10K

Chassis hole for Spark Ground

SPARK GND-R

J3:1J3:5J3:3

J3:4

J3:6J3:2

J3:10

J3:7J3:12J3:11

J3:8J3:9

21A

Spar k Ground

To Push&Hold reset circuit on Control PCB.

.1µF

C50

MUTE OUT 1

Right Pushbutton PCB

S8S7S5 S6

J10:4 J10:5 J10:2 J10:1 J10:6 J10:3 J10:11 J10:7 J10:9 J10:10 J10:8 J10:12

Spar k Ground

SG12

SG11

SG10

SG9

SG14

SG13

SG16

SG15

OUT 2 STANDBY

Spar k Ground

PB SPARK GND-R

Also connects to switch tab ground.

This Ground connects to the Chassis.

PROC

Left Pushbutton PCB

S4S3S2

J6:4 J6:5 J6:2 J6:1 J6:6 J6:3 J6:11 J6:7 J6:9 J6:10 J6:8 J6:12

Spar k Ground

SG4

SG3

SG6

SG5

SG8

SG7

TONE BYPASS TRIM

Spar k Ground

PB SPARK GND-L

Also connects to switch tab ground.

This Ground connects to the Chassis.

B+

B-

U3:1

U3:2

RIGHT PB AD

10µF

C58 .1µF

C57

Vout RT

3.3V

Right Pushbutton A/D Buffer

.1µF

C55

3.3V

22.1

R65

SPARK GND-R

22.1

R64

MH10

153462107121189

15 34 62 107 12

11 89 15 34 62 107 12

11 89

153462107121189

22.1

R66

22.1

R67

0V = Standby/On

1.6V = Out2

2.2V = Out1

2.5V = Mute

0V = Trim

1.6V = Bypass

2.2V = Proc

3.3V = Open

2.5V = Not used

3.3V = Open

Vout RT Levels

Vout LT Levels

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