McIntosh C49 Service Manual

19 20
DIGITAL 751973 SCH 2 of 3
3
+3.3VD
22µF
C10
22µF
C14
.1µF
C7
.1µF
C13
.1µF
C11
22µF
C12
.1µF
C4
.1µF
C2
1k
R7
.1µF
C1
.1µF
C16
22µF
C15
215
R11
680µH
L2
.1µF
C5
4
2
1
3
Vcc
GND
5
U1
22µF
C3
.1µF
C6
100µH
L1
TAB
4
VOUT
2
VI N
3
GND
1
U2
1k
R8
L3
2
1
3
4
IN HVC C
OU T GND
100. 0000
Y1
3k
R26
10µF
C21
22µF
C32
499
R36
47.5K
R33
6
5
7
U6:2
2
3
1
84
B+
B-
U6:1
1000pF
C20
+7 V D A
-7V D A
1000pF
C19
3300pF
C34
330pF
C25
1.58k
R20
3
1
2
Q3
4.75k
R38
3
1
2
Q2
4.75k
R37
3
1
2
Q1
1000pF
C17
-7V D A
+7 V D A
1000pF
C18
330pF
C27
215
R13
330pF
C24
330pF
C28
2
3
1
84
B+
B-
U4:1
6
5
7
U4:2
8.25k
R31
10µF
C26
4
2
1
3
Vcc
GND
5
U7
+7 V D A -7V D A
-7V D A
100K
R35
215
R12
215
R14
215
R15
-7V D A
+7 V D A
6
5
7
U9:2
1.58k
R19
3k
R25
1.58k
R22
2
3
1
84
B+
B-
U9:1
2200pF
C23
1.58k
R17
1.58k
R18
2200pF
C22
3k
R23
3k
R24
1.58k
R29
1.58k
R21
1.58k
R28
22µF
C31
499
R34
47.5K
R32
3300pF
C33
.1µF
C29
+7 V D A
.1µF
C30
-7V D A
.1µF
C35
.1µF
C36
+7 V -7V
10
R16
10
R27
+3.3VD
+3.3VD
+3.3VD
+3.3VD
+3.3VD
+3.3VD
+1. 2VD
+3. 3VA
AVCC_L
14
DVCC_T
48
SDA
16
DATA_CLK
46
SCL
17
DATA2
44
XI(MCLK)
19
DATA4
42
VDD
21
DATA6
40
GND
23
DATA8
38
DAC7
12
DAC5B
10
GND
8
AVCC_L
6
DAC3
4
DAC1B
2
VDD
25
DAC8B
27
DAC6
29
AVCC_R
31
DAC4
33
DAC2B
35
DAC7B
11
DAC5
9
RESET
7
GND
5
DAC3B
3
DAC1
1
VDD
13
GND
15
XO
18
DATA1
45
DATA3
43
VDD
47
GND
22
AVCC_R
24
DVCC_B
20
DATA7
39
GND
37
DATA5
41
DAC8
26
DAC6B
28
AUTOMUTE
30
GND
32
DAC4B
34
DAC2
36
U3
6-32
GP1
6-32
GP2
.1µF
C9
.1µF
C8
+3.3VD
+3.3VD
I2C CL
I2C DA
RESET
AUTOMUTE
47.5
R3
47.5
R4
47.5
R2
47.5
R1
47.5
R5
47.5
R6
1
0 UNMUTED
MUTED
DA C LDA C R
I2SBCLK / DSDBCLK
I2SLRCK / DSDL
I2SDATA / DSDR
I2SDATA / DSDL
DSD R
DSD L
1
0 RESET
RUN
2
3
1
8
4
B+
B-
U8:1
-7V D A
+7 V D A
6
5
7
U8:2
-7V D A+7V DA
MUTE
10k
R30
DS1
+3.3VD
-7V D A
-7V D A
DAC L
DAC R
M U TE
(1.5 k ) (3.3 2k )
(221)
(1.5 k )
6-32
GP5
6-32
GP6
OPEN
R122
OPEN
R123
.1µFC108
.1µF
C109

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