McIntosh C49 Service Manual

C49
17 18
DIGITAL 751973 SCH 1 of 3
3
+3. 3VD
DM
16
VD D
13
VD D
14
DS D_128_FLAG
11
VD D18
8
SO F_FLA G
9
SPD RX
6
VDD18O UT
3
VD D
4
VD D
1
TEST 6
64
TEST 3
61
TEST 4
62
TEST 1
59
VD D
56
REF CLKI N
57
SC L1
54
MCLK1
51
VD D
52
SC LK1
49
GP IO4
33
GP IO7
36
GP IO6
35
RESE T N
38
SDA
41
SCL
40
VDD 18
43
MC LK0
46
SDAT A00 /D S D_D L
45
SPDT X
48
DP
15
VD D
7
GN D
5
RE XT
12
DS D_FLAG
10
GN D
2
GN D
17
VD D18
20
XO
19
GN D
22
GN D
25
VD D
24
GPI O0
27
GPI O1
30
VD D
29
GPI O3
32
GP IO5
34
GP IO8
37
VDD
39
SCLK0/DS D _CLK
42
VDD
44
LRC L K 0/DS D _DR
47
TEST 5
63
VD D18
58
LR CLK1
53
TEST 2
60
SD A1
55
SD AT A10
50
X1
18
GN D
23
VD D18
28
VD D
21
VD D
26
GPI O2/ USB(H S/FS)SEL
31
U29
.1µF
C90
L17L16
10µF
C88
.1µF
C82
22.1
R78
10µF
C81
.1µF
C85
.1µF
C89
.1µF
C92
.1µF
C86
.1µF
C80
.1µF
C87
.1µF
C84
12pF
C75
12pF
C71
.1µF
C79
270R91
10k
R93
10k
R95
10k
R96
10k
R97
10k
R98
10k
R99
10k
R100
75
R88
75
R89
10k
R85
10k
R87
10k
R84
4
2
1
3 5
Vc c
GND
U30
10k
R94
DS3
SOF
22.1
R71
22.1
R77
47.5K
R76
.1µF
C77
L14
.1µF
C70
22µF
C78
WP
7
SC L
6
VC C
8
SD A
5
A1
2
A2
3
A0
1
GN D
4
U28
24MHz
31
2 4
Y3
22µF
C83
REF
9
NC
10
NC
11
GND2
12
VDD2
13
S3
14
NC
15
XIN
16
XOUT
1
S0
2
S1
3
S2
4
VDD1
5
GND1
6
NC
7
CLK
8
U26
10k
R90
10k
R82
10k
R81
10k
R80
10k
R79
10k
R86
10k
R83
.1µF
C76
+3. 3VD
DSD 64
1
0
DSD 128
PCM
0
1
+3. 3VD
+3. 3VD
SOF
+3. 3VD
+1. 8VU SB
12M Hz
+3. 3VD +3. 3VD +3. 3VD +3. 3VD
1.58k
R106
DSD
+3. 3VD+3. 3VD +3. 3VD
AUTOMUTE
12pF
C100
12pF
C99
TC K
TD I
TD O
TMS
.1µF
C104
.1µF
C101
.1µF
C96
215
R118
215
R117
GN D
1k
R110
.1µF
C97
.1µF
C105
.1µF
C93
12.00MHz
Y4
I2C CL
I2C DA
22.1
R107
22.1
R108
.1µF
C102
3.3µH
L18
PA20/PGMD8/AD3
16
PA19/PGMD7/AD2
13
PA22/PGMD10/AD9
14
PA21/PGMD9/AD8
11
VDDOUT
8
PA17/PGMD5/AD0
9
PB3/AD7
6
PB0/AD4
3
PB1/AD5
4
ADVREF
1
VDDPLL
64
XOUT/PB8
61
XIN/PGMCK/PB9
62
PB13/DAC0
59
DDM/PB10
56
DDP/PB11
57
VDDCORE
54
TMS/SWDIO/PB6
51
PA31
52
TDO/TRACESWO/PB5
49
TDI/PB4
33
PA4/PGMNCMD
36
PA5/PGMRDY
35
PA28
38
PA29
41
TST
40
PA3
43
GND
46
VDDIO
45
PA0/PGMEN0
48
PA23/PGMD11
15
VDDIN
7
PB2/AD6
5
VDDCORE
12
PA18/PGMD6/AD1
10
GND
2
GND
17
PA15/PGMD3
20
PA16/PGMD4
19
PA13/PGMD1
22
PA25/PGMD13
25
VDDCORE
24
PA12/PGMD0
27
PA9/PGMM1
30
PA10/PGMM2
29
PA7/XIN32/PGMNVALID
32
PA6/PGMNOE
34
PA27/PGMD15
37
NRST
39
PA30
42
PA2/PGMEN2
44
PA1/PGMEN1
47
PB14/DAC1
63
VDDIO
58
TCK/SWCLK/PB7
53
GND
60
ERASE/PB12
55
JTAGSEL
50
VDDIO
18
PA24/PGMD12
23
PA11/PGMM3
28
PA14/PGMD2
21
PA26/PGMD14
26
PA8/XOUT32/PGMM0
31
U33
+1. 2VM
GPI O3
GPI O4
GPI O5
GPI O6
RST
ER ASE
S1
S2
RESET
DAC TXD
DAC RXD
AGN D
+3. 3VBU
USB RST
CLOCK GEN ERATOR
1
0 " CD "
" SACD "
1 0 " DSD 64 "
1 1
x
" DSD 128 "
PA7
1 000
10 00
0 00 0
1 1 10
1 1 0 0
111 0
1 0 1 0
11 0 0
1 00 0
" 32kHz "
" 44.1kHz "
" 48kHz "
" 88.2kHz "
" 96kHz "
" 176.4kHz "
" 192kHz "
" 352.8kHz "
" 384kHz "
TCK
TD I
TDO
TMS
GND
6
4
2
3
5
1
7 8
9 10
11 12
13 14
15 16
USB - USB +
TCK
TMS
TDO
TDI
RXD
TXD
TST
GND
GND
NRST
+3.3V
GND
GND
GND
J4
I2C CL
I2C DA
.1µF
C103
A = 0 0 0 (0)
10k
R112
DS9
+3.3VD
10k
R111
DS8
+3.3VD
DSD FL
OPT 1
OPT 2
4
2
1
3
Vc c
GND
5
U32
+3.3VD
10k
R105
+3.3VD
MCT ON
10k
R101
DS4
4
2
1
3
Vc c
GND
5
U35
+3.3VD
10k
R109
+3.3VD
USB ON
10k
R121
DS10
10k
R104
DS7
+3.3VD
10k
R103
DS6
+3.3VD
COAX 1
COAX 2
10k
R115
10k
R114
DSD128 FL
DSD128 FL
x
x
x
x
x
x
x
x
x xx
xx
x
xx
PA8 PA9 PA10
0
0
0
0
0
0
0
0
0
1
0
" SILENT "xxxxx x
0
1
0
0
PA16 PA15
" SILENT "x
DSD FL
+3. 3VD+3. 3VD
+3.3VM
+3.3VM
MUTE
MCT DISPLAY
6
4
2
3
5
1
PW R
D -
D +
GN D
CASE
CASE
J6
47.5
R120
47.5
R119
+3. 3VM
USB RST
USB RST
10k
R102
DS5
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
U34
DBUG RX
DBUG TX
DBUG RX
DBUG TX
10µF
C91
10µF
C95
10µF
C94
GPI O0
PA11 PA12 PA14
PA16
x
0
0
0
0
0
0
0
0
0
1 " DSD 256 "xx0
x
x
x
x
x
x
x
x
x
x
x
1 1 0 0
SACD FL
75
R113
75
R116
USB DISPLAY
10k
R92
3
2
1
7 14
Vc c
GND
U5:1
+3.3VD
GND
USB DSDR
4
2
1
3
Vcc
GND
5
U31
+3. 3VD
USB BCLK
6
5
4
U5:2
DSD FL
USB DSDL
8
10
9
U5:3
11
13
12
U5:4
MCT ON
USB I2SLRCK
USB I2SDATA
.1µF
C98
+3.3VD
MCTUSB
RUN
USB2 +
USB2 -
USB2 +
USB2 -
DAC L
DAC R
J7:17
J7:1
J7:15
J7:14
J7:5
J7:6
J7:9
J7:12
J7:13
CO NTRO L
J7:16
J7:18
J7:10
J7:3
J7:4
J7:7
J7:8
J7:2
J7:11
GND
+3. 3VBU
USB2 +
USB2 -
GN D
DAC RXD
DAC TXD
DAC RXD
DAC TXD
GN D
+12V
-7V
+7V
A GN D
A GN D
+5V +3. 3VD
+5V
+5V
Not U sed
Not U sed
USB RST
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
DGN D
DGN D
DGN D
5V
5V
12V
-7V
+7V
DAC L
DAC R
AGN D
6-32
GP4
47.5
R72
OPEN
C74
47.5
R75
6
4
2
3
5
1
PW R
D-
D+
GN D
CASE
CASE
J5
D3 D4
90 OHM
L15
USB DP
USB DM
USB INPU T
1000pF
C73
0
R73
.1µF
C106
.1µF
C107
-7V +7V
VOUT
3
GND
2
VIN
1
TAB
4
U27
.
1µF
C72
GN D
GN D

McIntosh C49 Specifications

General

Type	Solid State Preamplifier
Total Harmonic Distortion	0.005%
Phono Input Impedance	47k ohms
Headphone Output	Yes
S/N Ratio	100dB
Frequency Response	20Hz to 20kHz +0, -0.5dB
Digital Inputs	2 Coax, 2 Optical, 1 USB, 1 MCT
DAC Type	8-channel, 32-bit/192kHz PCM/DSD
Dimensions	17.5 inches (44.45cm) wide, 6 inches (15.24cm) tall (including feet), 18 inches (45.72cm) deep (including front panel and cables)
Inputs	2 Balanced
Outputs	2 balanced, 2 unbalanced
Signal to Noise Ratio	100dB
Gain	15dB
High Level Input Impedance	20K ohms, Balanced or Unbalanced