McIntosh MCD-301 Service manual
MCD301
MCD301
SACD / CD PLAYER
SERIAL NO. YM1001 And Above
CONTENTS
Performance Specifications ..........................................2
Notes ...........................................................................3
Safety Information ......................................................3
Rear Panel ...................................................................5
Section Location .......................................................... 5
Block Diagram ............................................................6
Interconnection Diagram ........................................7 - 8
Main Schematic and PCB .................................... 9 - 16
SERVICE MANUAL
Display Schematic and PCB................................17 - 20
Control Schematic and PCB ................................21 - 22
Power Schematic and PCB ..................................23 - 24
Primary Schematic and PCB ...............................27 - 28
Headphone Schematic and PCB .........................29 - 30
Parts List .............................................................31 - 36
Repacking Instructions ...............................................37
PERFORMANCE SPECIFICATIONS
Audio Specications
Fixed Output level
2.0Vrms Unbalanced
4.0Vrms Balanced
Variable Output level
0 - 6.0Vrms Unbalanced
0- 12.0Vrms Balanced
Output Impedance
600 ohms Unbalanced and Balanced
Frequency Response
4Hz to 40,000Hz, +0.5, -3dB (SACD)
4Hz to 20,000Hz, ±0.5dB (CD)
Signal to Noise Ratio
Better than 110dB (A-weighted)
Dynamic Range
Better than 100dB
Harmonic Distortion
0.002% @ 1000Hz (SACD)
0.003% @ 1000Hz (CD)
Channel Separation
Better than 98dB (1,000Hz)
Transport
Laser Type: Twin Beam
Laser Beam Wavelength: 650nm
(SACD)/790nm (CD)
Laser Power: CLASS IIa/CLASS I
Power Requirements
100 Volts, 50/60Hz at 35 watts
110 Volts, 50/60Hz at 35 watts
120 Volts, 50/60Hz at 35 watts
220 Volts, 50/60Hz at 35 watts
230 Volts, 50/60Hz at 35 watts
240 Volts, 50/60Hz at 35 watts
Standby: Less than 1 watt
Note: Refer to the rear panel of the MCD301 for the
correct voltage.
Overall Dimensions
Width is 17-1/2 inches (44.45cm)
Height is 6 inches (15.24cm)
Depth is 16-1/2 inches (41.91cm)
Note: When the Disc Tray is opened, the panel
clearance required in front of mounting panel is 6-3/4
inches (17.2cm).
Weight
28.2 pounds (12.8Kg) net, 44.6 pounds
(20.2Kg) in shipping carton
General Specications
Digital Output
Optical: - 15dbm to -21dbm (PCM)
Coaxial: 0.5V p-p/75 ohm (PCM)
Sampling Frequencies: 44.1kHz (PCM)
Shipping Carton Dimensions
Width is 26-1/2 inches (67.3cm)
Depth is 24-1/4 inches (62.2cm)
Height is 11-3/4 inches (29.9cm)
2
NOTES
MCD301
1. The heavy notes on the schematic denote the primary
signal path.
2. Unless otherwise noted, all voltages indicated on the
schematics are measured under the following conditions:
a. AC input at 120 volts, 50/60Hz.
b. All voltages are +/-10% with respect to ground. A
high impedance (10 megaohm) voltmeter must be used.
3. Unlessotherwisespecied:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).
SAFETY INFORMATION
CAUTION: Invisible Laser Radiation when open.
DO NOT stare into the beam or view
directly with optical instruments. Use of
controls or adjustments or performance
of procedures other than those speci-
edintheOwnersManualmayresult
in Hazardous Radiation Exposure.
4. On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1
5. WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom-
mended by the manufacturer.
6. Use McIntosh Remote Control Model HR056 with the
MCD301.
Servicing of laser mechanism is to be
performed at the service facility at
McIntosh Laboratory Inc.
This product incorporates an embedded
Class 3R Laser (IEC60825-1).
LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT
VAROITUS! Laitteen kayttaminen muulla kuin
tassa kayttoohjeessa mainitulla
tavalla saattaa altistaa kayttajan
turvallisuusluokan 1 ylittavalle
nakymattomalle lasersateiiylle.
VARNING! Om apparaten anvands pa annat
satt an i denna bruksanvisning
specicerats,kananvandaren
utsattas for osynbg laserstraining,
som overskrider gransen for
laserklass 1.
3
NOTES
4
REAR PANEL
SECTION LOCATIONS
MCD301
TOP VIEW WITH COVER REMOVED
5
BLOCK DIAGRAM
6
120V AC
50/60Hz
CX131
MAIN
J4
BLK
WHT
GND
GND
GND
NS3.3V
POWER IN
POWER
GND
-12VA
GND
12VA
GND
5VD
GND
3.3VD
GND
NS5V
NS5V
GND
18
12
1711
2
1
NS3.3V
POWER
GND
-12V
GND
12V
GND
5VD
GND
3.3VD
10
1
J3
GND
GND
GND
NS3.3V
POWER IN
POWER
GND
-12VA
GND
12VA
GND
5VD
GND
3.3VD
GND
NS5V
NS5V
GND
J7
18
12
17
11
2
1
3.3VD
GND
5VD
GND
12V
GND
-12V
GND
POWER
NS3.3V
CY101
10
1
SPDIF
GND
MUTE
MODE
GND
DSDL/PDL
DSDR/PDR
GND
PLRCK
GND
PBCK
GND
MS
MDI
MC
MDO
RST
PURE DIR
MODE 3
GND
MCLK
GND
MCK2
GND
DBCK
J8
2
13
25
CX251
25
13
1
GND
NC
NC
GND
REM OUT
GND
KEY1
KEY0
DATA
CLK
CS
RST
GND
CX131
1
13
24
1
SPDIF
GND
MUTE
MODE
GND
DSDL/PDL
DSDR/PDR
GND
PLRCK
GND
PBCK
GND
MS
MDI
MC
MDO
RST
PURE DIR
MODE 3
GND
MCLK
GND
MCK2
GND
DBCK
LEFT
GND
RIGHT
GND
J16
4
1
REM IN
REM OUT
A2
MUTE LED
A3
GND
A0
INI
A1
CL
LEV-DDILEV-U
CE
NS5V
RST
SSTBY/ON
GND
J1
2
1
17
18
J1
8
7
2
1
GND
BACK
GND
NEXT
GND
LEV-D
5VD
LEV-U
J3
8
7
2
1
GND
BACK
GND
NEXT
GND
LEV-D
5VD
LEV-U
J4
18
17
2
1
REM IN
REM OUT
A2
MUTE LED
A3
GND
A0
INI
A1
CL
LEV-DDILEV-U
CE
NS5V
RST
STBY/ON
GND
GND
NC
NC
GND
REM OUT
GND
KEY1
KEY0
DATA
CLK
CS
RST
GND
J2
12
13
2
1
5VD
3.3VD
GND
32V
GND
F-
F+
J1
7 1
LEFT
GND
RIGHT
GND
J2
4
1
BLK
BLU
GRY
VIO
ORN
WHT
T1
GRN
GRN
YEL
BLU
YEL
RED
BLK
RED
12OVB
20VB
0VB
120VA
100VA
0VA
J3
1
6
BLK
BLU
GRY
VIO
ORN
WHT
J6
J5
AC11.5V
AC11.5VCT
AC11.5V
AC26V
AC26VCT
AC26V
AC6V
AC6V
J2
9
1
YEL
BLU
YEL
RED
BLK
RED
BRN
BRN
1
J1
7
5VD
3.3VD
GND
3.2V
GND
F-
F+
2
MECHANISM
3
CONTROL
5
DISPLAY
4
POWER
6
PRIMARY
7
HEADPHONE
8
MCD301
INTERCONNECT
7 8
2
(IO)
(IO)
(OD)
5V
RST
CL
REM IN
.01uF
C14
A0
A1
A3
D4
D8
IN
MUTE LED
LEV-D
LEV-U
475k
R45
D5
(IO)
(OD)
(IO)
.1uF
C22
3.3V REGULATOR
POWER
CONTROL
D6
CONTROL
DATA IN
IR IN
DI
CE
100
R9
100
R10
100
R8
2K
R17
10k
R24
15K
R16
MUTE C ONT
10k
R29
D1
47uF
C12
.1uF
C13
.1uF
C20
A2
1000pF
C16
GND
3
B
2
Y
4
A1VCC
5
U5
.47uF
C19
.1uF
C38
15K
R25
.1uF
C23
1000pF
C26
1uF
C28
15K
R21
8.25k
R33
.01uF
C36
DRIVER
47uF
C32
.1uF
C34
47.5
R56
47.5
R55
12
L3
D712L5
OUT
POWER
100
3 4
R1B
100
3 4
R2B
100
1 2
R2A
0
R6
.1uF
C24
STBY/ON
0
R14
47.5k
R22
47.5k
R27
1000pF
C21
100k
R30
2
1 3
INOUT
U13
8.25k
R32
1.5k
R34
.1uF
C27
4.75M
R38
100pF
C33
47.5k
R47
47.5
R54
12
L4
1.5k
R53
1000pF
C10
5x47k
2
3
4
5
6
1
R7
3 1
2
Q1
3 1
2
Q3
15K
R15
15K
R11
15K
R12
1uF
C17
100uF
C37
47.5k
R18
.1uF
C30
562
R52
22.1k
R50
22.1k
R51
1
2
34
5
6
U31
47.5k
R37
1k
R49
1 2
L2
2
5
1
J5
2
5
1
J3
1000pF
C11
100
1 2
R1A
22.1
R20
6.0MHz
1
3
2
Y1
15K
R13
4.75M
R28
2 1
3
Q7
47.5k
R39
2
5
1
J4
2
5
1
J6
GND
3
B
2
Y
4
A1VCC
5
U7
GND
3
B
2
Y
4
A1VCC
5
U8
TRIG
6
CTLVOL
3
RESET
4
DISCHG
1
OUTPUT
9
CTLVOL
11
THRS
12
VDD
14
GND
7
OUTPUT
5
THRS
2
TRIG
8
RESET
10
DISCHG
13
U9
P1.2
12
P2.2
13
P2.4
15
P1.1
17
P1.0
18
P0.7
19
P0.6
20
P0.522P0.3
24
P0.2
25
P1.7
4
P2.1
2
P2.6
27
VDD
21
P0.4
23
P2.3
14
P1.311P1.410XTAL/P3 .18RST/P1.5
6
P1.6
5
P2.5
16
XTAL/P3 .0
9
VSS
7
P0.0
3
P0.1
26
P2.7
28
P2.0
1
U2
10uF
C7
.1uF
C8
OPTICAL OUT
.1uF
C3
.1uF
C1
COAXIAL OUT
.1uF
C2
150pF
C5
12
3
FN1
2
1
J2
47uF
C4
.1uF
C6
47uF
C9
18uH
L1
332
R4
100
R3
13
4 2
T1
1
3
2
GND
VCC
INPUT
OPT1
220uF
C40
220uF
C39
100uH
L6
100uH
L7
7
1
6 5
4
2
3
CX
B\
A
Q
R\Q\
RXCX
16
8
B+
GND
U11A
9
15
10 11
12
14
13
CX
B\
A
Q
R\Q\
RXCX
U11B
2
1
3
7
B+
GND
14
U10A
5
4
6
U10B
10
9
8
U10C
13
12
11
U10D
SPDIF
5VD
GND
GND
NS5V
NS5V
GND
3.3VD
GND
GND
GND
12VA
-12VA
12VA
-12VA
3.3VD
3.3VA
5VA
POWER
POWER IN
NS3.3V
GND
SCLK
DATAI
CS
REM OUT
0
R5
GND
3
B
2
Y
4
A1VCC
5
U3
.1uF
C18
GND
3
B
2
Y
4
A1VCC
5
U12
.1uF
C31
.1uF
C35
47.5k
R48
1k
R44
2 1
3
Q5
31
2
Q4
681
R43
4.75k
R46
10k
R40
4.7
R42
4.7
R41
D3
3300uF
C29
31
2
Q2
47.5k
R19
-11.5VA
MUTE
4.75k
R23
GND
3
B
2
Y
4
A1VCC
5
U4
GND
3
B
2
Y
4
A1VCC
5
U60
R31
.47uF
C15
OMUTE
HMUTE
22uF
C25
100k
R36
332
R35
D2
2
1
3
7
B+
GND
14
U1A
5
4
6
U1B
10
9
8
U1C
13
12
11
U1D
47.5k
R26
NS5V
GND
INI
GND
J1:1
J1:2
J1:3
J1:4
J1:5
J1:6
J1:7
J1:8
J1:9
J1:10
J1:11
J1:12
J1:13
J1:14
J1:5
J1:16
J1:17
J1:18
J7:1
J7:2
J7:3
J7:4
J7:5
J7:6
J7:7
J7:8
J7:9
J7:10
J7:11
J7:12
J7:13
J7:14
J7:15
J7:16
J7:17
J7:18
GND
GND
100k
R210
.47uF
C150
220uF
C148
.1uF
C149
GNDC
.1uF
C147
*
15K
R208
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
J4:1
J4:2
J4:3
J4:4
J4:5
J4:6
J4:7
J4:8
J4:9
J4:10
J4:11
J4:12
J4:13
J4:14
J4:15
J4:16
J4:17
J4:18
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
MAIN 750771 SCH 1 OF 3
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