McIntosh MTI100 - Input Knob; Volume Knob; About Those Tubes; Turntable Maintenance

MTI100
13 14
.1µF
C 27
.1µF
C 24
.01µFC25
10 µF
C 26
+3 .3V BU S
3 32 R 31
3 32
R 32
TO MICRO
USB TYPE B
BRIDGE INTERFACE USB-UART
L4
.1µF
C 28
SL EEP
12
T X DEN
13
DCD
10
GN D 7
7
NC
8
RX D
5
DT R
2
RT S
3
3.3V
17
USBD N
16
RE SET
19
RX LED
22
GN D 21
21
N C
24
OSC I
27
T E ST
26
DSR
9
CT S
11
PRWE N
14
T X D
1
VCC IO
4
RI
6
V CC
20
GN D 18
18
USBD P
15
OSC O
28
A G N D
25
T X LED
23
U5
6
4
2
3
5
1
PWR
D-
D+
GND
CASE
CASE
J7
J1 3:1
J1 3:2
J1 3:3
J1 3:5
J1 3:4
+3 ,3V BU
D GN D
TO TXD (MICRO/ BLUETOOTH)
TO RESET (MICRO)
TO RXD (MICRO/ BLUETOOTH )
6-3 2
G P3
6-3 2
GP4
O PEN
C39
OPEN
C40
OPEN
C41
2a
2a
2a
2a
2a
TO C TS (BLUETOOTH )
TO R TS (BLUETOOTH )
1
2
3
4
5
6
7
S3
J1 7:1
J1 7:2
J1 7:3
J1 7:4
J1 7:5
TO BLUETO OTH
T X D
RXD
RXD MICRO
RXD BLU E
T X D MICRO
TXD BLU E
TO MICRO TO BLUETOOTH
D GN D
UART SWITCH
3
3
3
3
3
.1µF
C 11
T X D
RXD
RXD MICRO
RXD BLU E
1k
R52
1k
R70
T X D MICRO
T X D BLU E
COM3
9
N O3
10
NC3
11
COM4
12
N O4
13
NC4
14
EN
15
V +
16
IN
1
NC1
2
NO1
3
CO M1
4
NC2
5
NO 2
6
CO M2
7
GN D
8
U9
.1µF
C 42
RST
RST
RST MICRO
RST MICRO
10 k
R 73
10 k
R 72
+3 .3V BU S
+3 .3V BU S
+3 .3V BU S
+3 .3V BU S
R
4
3
D S7 :1
G
5
2
D S7 :2
B
6
1
D S7 :3
4 7.5 k
R 33
1 k
R 75
2 70
R 76
(CONTROL, SENSOR/HP, TERMINAL, USB) 752183 SCH 3 of 3
2a 2b 2c 2d