McIntosh MP1100 - Page 28

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DISPLAY /STBY PSHBTN/MUTE PSHBTN/L MTR/R MTR 751912 SCH 2 OF 2
10
9
8
76
150
R2
10µF
C1
Vs
2
OUT
1
GND
3
IR1
.1µF
C2
22.1
R1
MUTE
+3.3VBU
S3
CA RT RIDGE
STANDBY/ON
150
R5
10µF
C3
475k
R4
D1
4
2
1
3
Vcc
GND
5
U2
4
2
1
3
Vcc
GND
5
U1
+3.3VBU
+3.3VBU
2.74k
R8
+3.3VBU
.1µF
C4
+3.3VBU
J6:5J4:2
DGND
+3.3VBU
+5VFD
J3:1
INP A
INP B
VFD CS
VFD DA
VFD CL
CAR A
CAR B
STBY
FR IR
PB DET
J3:2
J3:3
J3:6
J3:7
J3:8
J3:5
J3:9
J3:10
J3:11
J3:13
J3:14
J3:15
J3:16
J3:17
J3:18
J3:19
J3:21
J3:22
J3:23
STBY PB
+3.3VBU
PB DET
CAR B
STBY
FP RST
FR IR
CAR A
+5VFD
VFD CL
VFD CS
INP A
VFD DA
INP B
GND
DIGITAL
5
5
5
5
5
2
5
5
5
5
5
5
5
5
5
5
DISPLAY
6
MUTE PUSHBUTTON
8
12.1k
R6
A B C
SS
GNDGND
1
2 3
6
7
4
5
S1
J1:1
J1:2
J2:1
J2:2
6
1
1
L METER
1
1
R METER
INP UT
A B C
SS
GNDGND
1
2
3
6
7
4
5
S2
J4:8 J6:1
S4
6.81k
R3
DS1
.188
MP1
FP RST
PAN LTS
MET LTS
4.42k
R9
1.21k
R7
NO PUSH
INPUT KNOB
CARTRIDGE KNOB
3.3V
1.17V
0V
MUTE2.2V
J3:20
J3:4
LMET+
LMET-
RMET+
RMET-
J3:12
5
5
5
5
5
R MET +
L MET -
R MET -
L MET +
MET LTS
PAN LTS
J6:3J4:6
J6:7J4:4
J5:2
J5:8
J5:6
J5:4
J7:5
J7:1
J7:3
J7:7
MUTE PB
STBY PUSHBUTTON
7
6
6
6
7
7
8
8
5
5
2
5
1
J13
FRONT TXD
FRONT RXD
TO EXT DB9 - 2 (RXD)
TIP
RING
GND
FROM EXT DB9 - 3 (TXD)
EXT DB9 - 5 (GND)
RXD
TXD
D3 D2