McIntosh C49 Service Manual

C49
9 10
CONTROL 752346 SCH 1 of 3
2
E X T T X D
E XT R X D
N RST
P AS S P C
TC K
TD I
TD O
TM S
V OL A
V OL B
IR CTR L
DAC TXD
D AC R XD
W P
7
SC L
6
VC C
8
SD A
5
A1
2
A2
3
A0
1
GN D
4
U2 0
CONV IR
IN P A
FR IR
IN P B
R EAR IR
H P DET
.1 µF
C4 9
.1 µF
C4 6
S1
A C D ET
I2 C C L
I2 C D A
PASS L T
+5 V
4
2
1
3 5
V cc
G ND
U1 1
4
2
1
3 5
V cc
G ND
U1 2
4
2
1
3
5
V cc
G ND
U1 0
+3 .3V BU
+3 .3V BU
+1 .2V M
+1 .2V M
+1 .2V M
+3 .3V M
+3 .3V M
+3 .3V M
+3 .3V M
+3 .3V M +3 .3V M
+3 .3V M
ERA S E
E R A SE
RESE T
VOL C S
VOL C L
+5 V
A U D IO
PB DET
AUD D ET
S2
J1 0:1
J1 0:3
J1 0:12
J1 0:9
D AC TXD
D AC R XD
+3 .3V BU
EXT TXD
EXT RXD NR ST
TC K
TD I
TD O
TM S
USB1 - USB1 +
+3 .3V BU
J9 :8
J9 :7
J8 :2 J8 :1
SD AA
3
G ND
4
SD AB
6
EN
5
VC C (A)
1
VC C (B)
8
SC L A
2
SC L B
7
U1 9
+3 .3V BU
+3 .3V BU
+3 .3V BU
-1 5V
+1 5V
+5 V
L8
.1 µF
C4 8
.1 µF
C4 4
.1 µF
C4 7
.1 µF
C4 3
.1 µF
C3 6
4.7 µF
C3 4
AD R EF
VO L B
VO L A
SD AA
3
G ND
4
SD AB
6
EN
5
VC C (A)
1
VC C (B)
8
SC L A
2
SC L B
7
U9
IN P A
IN P B
H P D ET
J6 :15
PB D ET
FR IR
+3 .3V BU+3 .3V BU
+3 .3V BU
+5 V D
I2 C C L
I2 C D A
.1 µF
C5 0
Q 3
7
VSS
8
Q 1
5
A1
2
A2
3
Q 4
9
Q 5
10
Q 7
12
SD A
15
SC L
14
Q 2
6
A0
1
Q 0
4
Q 6
11
VD D
16
N C
13
U1 5
22.1k
R4 7
+3 .3V BU
+3 .3V BU +3 .3V BU
I2 C C L
I2 C D A
.1 µF
C3 5
4.7 µF
C3 7
.1 µF
C4 5
4
2
1
3 5
V cc
G ND
U1 6
.1 µF
C5 1
4
2
1
3 5
V cc
G ND
U1 7
12pF
C4 2
12pF
C4 1
12 .0 0M H z
Y1
J1 0:6
J1 0:7
J1 0:4
J1 0:5
J1 0:18
J1 0:2
U SB1 +
U SB1 -
PS ON
+3 .3V BU
D IG ITA L
J9 :17
J9 :18
+3 .3V BU
A = 0 1 0 (2 )
6
4
2
3
5
1
7 8
9 10
11 1 2
13 1 4
15 1 6
USB - USB +
T C K
T MS
T D O
T D I
RXD
T XD
T ST
G ND
G ND
NR ST
+3 .3V
G ND
G ND
G ND
J7
ERASE
+3 .3V M
3
1
2
Q 3
4
2
1
3
V cc
G ND
5
U1 4
FP R ST
PW R
+3 .3V M
P W R R LY
4
2
1
3
V cc
G ND
5
U2 3
3
1
2
Q 4
.1 µF
C5 3
+3 .3V BU
+3 .3V BU
PA2 0 /PG MD 8 /AD 3
16
PA1 9 /PG MD 7 /AD 2
13
PA2 2 /PG MD 1 0/AD 9
14
PA2 1 /PG MD 9 /AD 8
11
VD D OUT
8
PA1 7 /PG MD 5 /AD 0
9
PB3/AD 7
6
PB0/AD 4
3
PB1/AD 5
4
ADVR EF
1
V DD P L L
64
X O UT/ PB 8
61
X IN /PG M C K/P B9
62
P B1 3/ D A C0
59
D D M/P B 1 0
56
D DP /P B1 1
57
V D D CO R E
54
T M S /S W D IO /P B6
51
P A3 1
52
T D O/T RA C ES W O /P B5
49
TDI/PB4
33
PA4/PG M NC MD
36
PA5/PG MRDY
35
PA2 8
38
PA2 9
41
TST
40
PA3
43
G ND
46
VD DIO
45
PA0/PG M EN 0
48
PA2 3 /PG MD 1 1
15
VD D IN
7
PB2/AD 6
5
VD D CORE
12
PA1 8 /PG MD 6 /AD 1
10
G ND
2
G ND
17
P A 15/P G M D3
20
P A 16/P G M D4
19
P A 13/P G M D1
22
P A 25/P G M D1 3
25
V D DC OR E
24
P A 12/P G M D0
27
P A 9/P GM M1
30
P A 10/P G M M2
29
P A 7/X IN3 2 /P GM N VA LI D
32
PA6/PG MNOE
34
PA27 /PG MD1 5
37
N RST
39
PA3 0
42
PA2/PG M EN 2
44
PA1/PG M EN 1
47
P B1 4/ D AC1
63
V D DIO
58
T C K/S W CL K/ P B7
53
G ND
60
E R A SE /P B1 2
55
JT A GS EL
50
V D DIO
18
P A 24/P G M D1 2
23
P A 11/P G M M3
28
P A 14/P G M D2
21
P A 26/P G M D1 4
26
P A 8/X OU T 32 /PG M M 0
31
U1 3
VF D C L
VF D D A
VF D C S
I2C CL 1
I2C DA 1
I2C CL 2
I2C DA 2
J1 0:13
J1 0:14
J1 0:15
J1 0:16
J1 0:10
R S2 32 S D
+1 .2V M
.1 µF
C3 9
+1 .2V M
.1 µF
C4 0
J6 :2
J6 :14
J6 :1
J6 :7
J6 :8
J6 :9
J6 :13
J6 :12
J6 :3
J6 :6
J6 :5
J6 :4
J6 :16
.1 µF
C5 2
.1 µF
C3 8
J9 :14
J9 :15
+3 .3V M
J8 :6
J9 :9
J9 :10
J9 :2
J9 :1
J9 :11
J6 :10
J6 :11
J6 :17
J6 :18
J6 :19
J6 :20
J6 :21
J6 :22
J6 :23
+3 .3V BU
+3 .3V BU
AUD D ET
22.1k
R4 6
VFD O N
+3 .3V BU
AU D D ET
+15V
-15V
+3. 3VBU
I2C C L 2
VOL C S
GND
+5V
D GND
VOL C L
I2C DA 2
4
2
1
3 5
V cc
G ND
U2 1
J9 :12
TONE CS
TON E C S
J8 :3
J8 :7 J8 : 8
J8 :10 J8 :1 1
J8 :12
J9 :3
J9 :4
J9 :5
J9 :6
J9 :16
M ET ENA
VOL D A
4
2
1
3 5
V cc
G ND
U1 8
J9 :13
VOL D A
+3 .3V BU
4
2
1
3
V cc
G ND
5
U2 2
J8 :4
4.7 5k
R2 4
+3 .3V BU +3 .3V BU
4.7 5k
R2 5
+3 .3V BU +3 .3V BU
4.7 5k
R4 9
4.7 5k
R5 0
4.7 5k
R4 2
4.7 5k
R4 3
+3 .3V BU
MET EN A
22.1k
R4 5
+3 .3V BU
+3 .3V BU
A U D IO
D IS P L A Y
M ET EN A
DAC T XD
USB1 -
USB1 +
+3. 3VBU
PB D ET
VOL B
PWR
FP R ST
AD R EF
HP D ET
FR IR
VOL A
+5VD
VFD CL
VFD CS
I2C C L 1
IN P A
VFD DA
IN P B
GND
I2C DA 1
+3 .3V BU
4
2
1
3
V cc
G ND
5
U3 6
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
4
4
4
4
4
4
4
4
4
4
4
4
4
4
3
3
3
3
3
3
3
+5 V D
+5 V
UN IT ID
J1 0:17
J1 0:8
J1 0:11
6
4
2
3
5
1
PWR
D-
D+
GND
CASE
CASE
J1 8
90 O HM
L34
D3 8 D 39
U SB1 -
U SB1 +
AD R EF
CG ND
.1 µFC1
4 -40
GP1
4 -40
GP3 .1 µF
C2
6-3 2
G P5
0
R1 2 6
0
R1 2 8
4 -40
GP2 .1 µF
C3
0
R1 3 0
47.5
R3 9
47.5
R3 8
1000pF
C7 7
3
3
3
3
3
3
3
3
3
3
3
DAC R
AGN D
+5 V
+5V
+3. 3VBU
+5V
+5 V
D GND
DGN D
DAC R XD
+1 2V (D A )
+12V
DGN D
AGN D
DAC L
+7. 5V
-7. 5V
DA R ESET
DA R ESET
D A R ESET
D AC L EFT
D AC R IG H T
DAC RIG HT
DAC LEFT
1k
R3 4
10k
R4 4
2.2 1k
R4 8
47.5k
R3 7
22.1
R2 8
22.1
R2 9
22.1
R2 7
22.1
R3 1
22.1
R3 0
22.1
R5 1
22.1
R5 3
22.1
R5 4
22.1
R5 2
22 .1
R1 2 5
22.1
R5 5
22.1
R5 6
22.1
R1 2 4
10
R2 6
4
4
4
4
+7 .5V
-7 .5V
+7 .5V
-7 .5V
4 -40
GP7
4 -40
GP8
4 -40
GP6
C4 9 - L on g P E M (R ev ersed G P)
C5 3 - N o P E M S S

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