McIntosh C2500 Service Manual

19
20
3
CONTROL
751457 SCH 1 of 5
R1
Active Low
Output
10
R6
1K
R2
47.5K
R4
1K
R5
3.3V BU
3.3V BU
IR_REAR
4
2
1
3
B+
GND
5
U1
.1UF
C2
3.3V BU
3.3V BU
.1UF
C10
BRKT1
DS1
058174 RA HOLDER
100
R7
10uFC1
IR SENSOR
2
1
3
Vcc
Vout
GND
MT1
.1UF
C3
3.3V BU
LVC-AND
D1
D3
1 2
L18
DATA-IN
10
R146
1
3
2
J16:1
D33
1 2
L19
IR-IN
4
6
5
J16:2
D34
1 2
L20
10
R148
1
3
2
J17:1
D35
DGND
1 2
L21
SUM
10
R149
4
6
5
J17:2
D36
1 2
L22
DVD
10
R150
1
3
2
J18:1
D37
1 2
L23
CD
10
R151
4
6
5
J18:2
D38
1 2
L24
AUX
10
R152
1
3
2
J19:1
D39
1
2
L25
SRVR
10
R153
4
6
5
J19:2
D40
1 2
L26
TUNER
10
R154
1
3
2
J20:1
D43
1 2
L27
CD2
10
R155
4
6
5
J20:2
D42
DATA PORTS
DATA
SRVR-ENABLE
TUNER-ENABLE
AUX-ENABLE
Q3
7
VSS
8
Q1
5
A1
2
A2
3
Q4
9
Q5
10
Q7
12
SDA
15
SCL
14
Q2
6
A0
1
Q0
4
Q6
11
VDD
16
NC
13
U28
I2C_SCL
I2C_SDA
3.3V BU
22.1
R156
22.1
R157
22.1K
R159
22.1K
R158
3.3V BU
DVD-ENABLE
CD2-ENABLE
CD-ENABLE
SUM-ENABLE
Address=0
3
1
2
Q6
ALL_DATA
22.1K
R168
AUX-ENABLE
100
R162
SPARE
3
1
2
Q7
ALL_DATA
22.1K
R169
SRVR-ENABLE
100
R163
3
1
2
Q8
ALL_DATA
22.1K
R170
CD2-ENABLE
100
R164
3
1
2
Q9
ALL_DATA
22.1K
R171
DVD-ENABLE
100
R165
3
1
2
Q10
ALL_DATA
22.1K
R172
TUNER-ENABLE
100
R166
3
1
2
Q11
ALL_DATA
22.1K
R173
CD-ENABLE
100
R167
3
1
2
Q5
ALL_DATA
22.1K
R161
SUM-ENABLE
100
R160
.1UF
C79
3.3V BU
Data Port Enabled
Disabled
Data Port Enabled
Disabled
Data Port Enabled
Disabled
Data Port Enabled
Disabled
Data Port Enabled
Disabled
Data Port Enabled
Disabled
Data Port Enabled
Disabled
TIP
RING
SLEEVE
TIP
RING
SLEEVE
TIP
RING
SLEEVE
TIP
RING
SLEEVE
TIP
RING
SLEEVE
TIP
RING
SLEEVE
TIP
RING
SLEEVE
TIP
RING
SLEEVE
TIP
RING
SLEEVE
TIP
RING
SLEEVE
SUM
100
R191
.1UF
C83
.1UF
C82
1
2
L40
1
2
L35
DATA OUT (TXD)
.1UF
C84
1 2
L39
.1UF
C81
RS232
Control
J25:6
J25:1
J25:8
J25:7
J25:9
J25:3
J25:2
J25:5
J25:4
.1UF
C85
3.3V BU
SMD
T2out
8
R2in
9
C2-
6
T2in
11
V+
3
R1in
14
EN
1
GND
16
C1+
2
C1-
4
C2+
5
V-
7
R2out
10
T1in
12
R1out
13
T1out
15
Vcc
17
SD
18
U37
RS232 Enable/RS232 Shutdown/
D50 D49
12
L36
12
L37
J25:10
J25:11
0
R250
Control Option
OPEN
R249
EXT_TXD
EXT_RXD
RS232 ON
RS232 Shutdown
Not Used
47.5K
DATA IN (RXD)
GND

McIntosh C2500 Specifications

General

Total Harmonic Distortion	0.08%
Signal to Noise Ratio	100dB
Rated Output Voltage	2.5V unbalanced, 5V balanced
Maximum Output Voltage	8V unbalanced, 16V balanced
High Level Voltage Gain	15dB
Type	Vacuum Tube Preamplifier
Inputs	6 unbalanced, 2 balanced, 1 phono MC, 1 phono MM
Outputs	3 unbalanced, 2 balanced
Weight	29 lbs (13.2 kg)
Input Impedance	47k ohms
Phono Voltage Gain	40dB (MM), 60dB (MC)
Frequency Response	+0, -0.5dB from 20Hz to 20, 000Hz +0, -3dB from 10Hz to 100, 000Hz