McIntosh C2500 Service Manual page 16

3 CONTROL
751457 SCH 5 of 5
F10
t
J11:1
J11:12 6
15V
F11
t
J11:2
6
J11:11 -15V
F12
t
J11:3
J11:10 6
5V
F13
t
J11:4
J11:9 6
3.3V
J11:5
J11:8 6
J11:6
J11:7 6
J11:7
J11:6 6
J11:8
J11:5 6
J11:9
J11:4 6
DAC_RXD
J11:10
J11:3 6
DAC_TXD
J11:11
J11:2 6
J11:12
J11:1
6
J12:1
J12:12 6 Detached
USB-SW-OE/
Attached
J12:2
USB PCB
6
J12:11 USB-SW-SEL Control PCB
J12:3
J12:10 6
J12:4
J12:9 6
J12:5
J12:8 6
J12:6
J12:7 6
J12:7
J12:6 6
J12:8
J12:5 6
J12:9
J12:4 6
USB+
J12:10
J12:3 6
USB-
R33
J12:11
J12:2 6
3.3V BU
10
J12:12
J12:1
6 USB Audio
USB-RESET_N
Reset
Run
27
TO AUDIO PCB
F1 F2
3V to 5V Translators
(To Audio PCB: Volume Control and Tone)
5V
1
TONE_CE
2
1 U34
Vcc
4
VOL_CE
2
GND
1 U35
Vcc
4
VOL_SCL
2
GND
1 U36
Vcc
4
VOL_SDA
2
GND
TO AUDIO PCB
U31
1 8
3.3V BU VCC(A) VCC(B)
2 7
I2C_SCL SCLA SCLB
3 6
I2C_SDA SDAA SDAB
4 5
GND EN
U38
Vcc
R252
4
TONECS
22.1
GND
22.1 R240
VOLCS
22.1 R241
VOLCK
R242
22.1
SDATA
R68
Power_Relay
R69
VFD PS ON
R71
Detached
USB-SW-OE/
Attached
R73
USB
Control USB-SW-SEL
TO AUDIO PCB
U7
1
3.3V BU 3.3V BU VCC(A)
2
I2C_SCL
SCLA
3
I2C_SDA
SDAA
4
GND
U18
Address=2
1 16
A0 VDD
2 15
A1 SDA
3 14
A2 SCL
22.1 4 13
Q0 NC
R70
22.1 5 12
Q1 Q7
R72
22.1
6 11
Q2 Q6
R74
22.1 7 10
Q3 Q5
R75
8 9
VSS Q4
C46
3.3V BU
.1UF
28
8
VCC(B) 3.3V BU
7
SCLB
6
SDAB
5
EN
3.3V BU
3.3V BU
R66 22.1
I2C_SDA
22.1
R67
I2C_SCL
22.1
22.1
22.1
Pwr_Supply
22.1
USB Audio
Reset
USB-RESET_N
Run