McIntosh C2500 - Input Level Adjustment; Power Mode

27
28
3
CONTROL
751457 SCH 5 of 5
22.1
R70
.1UF
C46
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
U18
22.1K
R63
22.1K
R61
22.1K
R60
22.1K
R57
22.1K
R56
22.1K
R65
22.1K
R64
I2C_SCL
I2C_SDA
3.3V BU
22.1
R66
22.1
R67
22.1K
R58
22.1K
R59
Power_Relay
3.3V BU
22.1
R72
22.1
R74
22.1
R75
22.1
R68
22.1
R69
22.1
R71
22.1
R73
VFD PS ON
22.1K
R62
Address=2
3.3V BU
J21:12
J21:11
J21:10
J21:9
J21:8
J21:7
J21:6
J21:5
4 4 4 4 4 4 4 4
TO AUDIO PCB
SDATA
VOLC S
VOLC K
J21:4
J21:3
J21:1
J21:2
J22:12
J22:11
J22:10
J22:9 J22:8
J22:7
J22:6
J22:5
4 4 4 4 4 4 4
4
J23:12
J23:11
J23:10
J23:9
J23:8
J23:7 J23:6
J23:5
4 4 4 4 4 4 4 4
J16:7
J16:6 J16:4
J16:3 J16:2
J16:5
J16:8
J16:1
J12:7 J12:6
J12:4 J12:3 J12:2
J12:5
J12:8
J12:1
J13:7
J13:6 J13:4
J13:3 J13:2
J13:5
J13:8
J13:1
TO AUDIO PCB
TO AUDIO PCB
J16:12
-15V
15V
3.3V BU
5V
3.3V BU
5V
5V
t
F1
t
F2
t
F3
t
F4
t
F6
t
F7
t
F9
SDAA
3
GND
4
SDAB
6
EN
5
VCC(A)
1
VCC(B)
8
SCLA
2
SCLB
7
U31
J12:12
J12:11
J12:10
J12:9
J12:8
J12:7
J12:6
J12:5
6
6
6
6
6
6
6
6
TO USB PCB
J12:4
J12:3
J12:1
J12:2
J12:7
J12:6
J12:4
J12:3
J12:2
J12:5
J12:8
J12:1
J12:12
J12:9
J12:10
J12:11
VOL_SCL
VOL_CE
I2C_SCL
I2C_SDA
3V to 5V Translators
VOL_SDA
4
2
1
3
5
Vcc
GND
U35
.1UF
C6
4
2
1
3
5
Vcc
GND
U34
4
2
1
3 5
Vcc
GND
U36
22.1 R240
22.1
R241
22.1
R242
SDATA
VOLCS
VOLCK
5V
(To Audio PCB: Volume Control and Tone)
SDA
SCL
3.3V BU
3.3V BU
SDA
SCL
SDAA
3
GND
4
SDAB
6
EN
5
VCC(A)
1
VCC(B)
8
SCLA
2
SCLB
7
U7
I2C_SCL
I2C_SDA
3.3V BU
3.3V BU
3.3V BU
USB+
USB-
J11:12
J11:11
J11:10
J11:9
J11:8
J11:7
J11:6
J11:5
6
6
6
6
6
6
6
6
TO USB PCB
J11:4
J11:3
J11:1
J11:2
J11:7
J11:6
J11:4
J11:3
J11:2
J11:5
J11:8
J11:1
J11:12
-15V
15V
5V
t
F10
t
F11
t
F12
3.3V
t
F13
J11:9
J11:10
J11:11
DAC_TXD
DAC_RXD
10
R33
USB-SW-SEL
USB-SW-OE/
USB-SW-SEL
USB-SW-OE/
USB-RESET_N
USB-RESET_N
10
R248
Pwr_Supply
Control
USB
Attached
Detached
Reset
USB Audio
Run
Attached
Detached
Control PCB
USB PCB
Reset
USB Audio
Run
4 4 4 4
J16:11
J16:10
J16:9
J22:4 J22:3
J22:2
J22:1
J23:4
J23:3
J23:2
J23:1
4 4 4 4 4 4 4 4
J13:9
J13:10
J13:11 J13:12
J12:9
J12:10
J12:11
J12:812
6
6
6
6
6
6
6
6
TONE_CE
4
2
1
3
5
Vcc
GND
U38
22.1
R252
TONECS
TONE CS
AUD DET