McIntosh C49 Service Manual

11 12
CONTROL 752346 SCH 2 of 3
2
.1µF
C14
VOUT
3
GND
2
VIN
1
TAB
4
U2
L1
.1µF
C16
100pF
C22
IN
ON/OFF
OUT
GND ADJ
___
TAB
1
6
2
3
4 5
U4
150k
R17
.1µF
C17
100pF
C23
IN
ON/OFF
OUT
GND ADJ
___
TAB
1
6
2
3
4 5
U5
332k
R23
332k
R18
.1µF
C19
.1µF
C25
IN
ON/OFF
OUT
GND ADJ
___
TAB
1
6
2
3
4 5
U7
L3
L7
L5
470µF
C27
470µF
C29
470µF
C30
.1µF
C20
.1µF
C26
1.82k
R22
L6
IN
ON/OFF
OUT
GND ADJ
TAB
1
6
2
3
4
5
U8
4
2
1
3
Vcc
GND
5
U1
3
1
2
Q1
.1µF
C6
150k
R7
AC DET EC TOR
.1µF
C5
3
1
2
Q2
AC DET
.1µF
C18 100pF
C24
IN
ON/OFF
OUT
GND ADJ
___
TAB
1
6
2
3
4 5
U6
22.1k
R13
L4
470µF
C31
PS ON
18.2k
R15
220µF
C32
220µF
C33
+V PC
+3.3V BU
+3.3V BU
+3.3V
+5V
+15V
-15V
YEL
RED
RED
.047µF
C8
D10
GR N
.047µF
C7
1.85A
t
R5
D7
3300µF
C11
3300µF
C12
J5:2
J5:3
J5:1
J5:6
J5:5
J5:4
BLU
BLU
6-32
GP4
1
GR Y
BLU
BLK
350mA
t
R1
D3
1
1
1
WHT
OR N
VIO
1
1
D2
2 6
8
4
1
3
5
7
PRIMARY
T1
+V BU
1000µF
C4
J3:1 J3:2
J4:4
J4:3
J4:5
J4:2
J4:1
J4:6
3300µF
C13
2 3
1
45
6
K1
!
!
!
J1:3
J1:2
J1:1
J1:4
J1:5
J1:6
J2:1
J2:2
PWR RLY
FH1
1.85A
t
R6
3A
T°
R3
3A
T°
R4
1
1
AC N
AC L
WHT
BLK
.1µF
C15
VFD ON
IN
ON/OFF
OUT
GND ADJ
___
TAB
1
6
2
3
4 5
U3
150k
R16
L2
470µF
C28
+5V D
D4
D5
D6
350mA
t
R2
D12
D11
D9
1
1
1
1
1
1
CO NVE R SION PLU G
TEST ON LY
APPLY 12VD C
TO ENERGI ZE RELAY
WITH NO AC POW ER
!
!
D8
D1
100pF
C21
+3.3V BU
+3.3V BU
1
1
1
1
1
1
100pF
C79
L35
470µF
C80
+12V (
D A )
IN
ON/OFF
OUT
GND ADJ
___
TAB
1
6
2
3
4 5
U39
22.1k
R132
.1µF
C78
221k
R133
221k
R19
221k
R20
1k
R9
1k
R14
10k
R21
100k
R8
47.5k
R40
47.5k
R12
47.5k
R11
47.5k
R10
6800µF
C10
6800µF
C9
3k
R134

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