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mda1000
schematic
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Service manual
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McIntosh MDA-1000 Service manual

D/A CONVERTER
CONTENTS
Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 4
Block Diagram ...................................................... 5 - 6
Interconnection Diagram ...................................... 7 - 8
Main Schematic and PCB................................... 9 - 18
SERVICE MANUAL
Keyboard Supply Schematic and PCB ............... 19 - 20
Display Schematic and PCB .............................. 21 - 22
Dataport Schematic and PCB ............................ 23 - 24
Exploded View and Parts List ............................. 31 - 32
Repacking Instructions ............................................. 33
PERFORMANCE SPECIFICATIONS
Analog Audio Specifications
Frequency Response
+/-0.5dB from 4Hz to 45,000Hz (Sampling Frequency – 96kHz and 88.2kHz) +/-0.3dB from 4Hz to 22,000Hz (Sampling Frequency – 48kHz) +/-0.3dB from 4Hz to 20,000Hz (Sampling Frequency – 44.1kHz) +/-0.3dB from 4Hz to 15,000Hz (Sampling Frequency – 32kHz)
T otal Harmonic Distortion
0.002% at 1,000Hz
Signal T o Noise Ratio
Better than 110dB (A Weighted)
Dynamic Range
Better than 100dB (1,000Hz)
Rated Output V oltage
2V Unbalanced Outputs (Bypass On Mode) 6V Unbalance Outputs (Bypass Off Mode) 2V Balanced Outputs (Bypass On Mode) 6V Balanced Outputs (Bypass Off Mode)
Digital Audio Specifications
Coaxial Inputs (1, 2 and 3)
0.5V p-p @ 75ohms
Optical Inputs (4, 5 and 6)
-15 ~ -20dBm
XRL Input (7)
5V p-p @ 110ohms
Sampling Frequencies
96kHz, 48kHz, 44.1kHz and 32kHz
General Specifications
Power Requirements
100 Volts 50.60Hz, 20 watts 110 Volts 50/60Hz, 20 watts 120 Volts 50/60Hz, 20 watts 220 Volts 50/60Hz, 20 watts 230 Volts 50/60Hz, 20 watts 240 Volts 50/60Hz, 20 watts
Note: Refer to the rear panel of the MDA1000
for the correct voltage.
Overall Dimensions
Width is 17-1/2 inches (44.45cm), Height is 6 inches (15.24cm) including feet, Depth is 16-1/8 inches (40.96cm) including Front Panel and Knobs
Digital Audio Format
IEC958, S/PDIF
NO TES
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 . Unless otherwise specified:
a. Resistor values are in ohms. b. Capacitor values are microfarads (uF). c. Inductor values are in microhenries (uH).
Weight
24 pounds (10.89kg) net, 38 pounds (17.24kg) in shipping carton
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 recom­mended by the manufacturer.
2
TOP AND REAR PANEL
MDA1000
3
SECTION LOCATIONS
DATAPORT
6
PCB
MAIN
PCB
2
UPSAMPLING
3
PCB
TRANSFORMER
5
DISPLAY
PCB
4
KEYBOARD
PCB
TOP VIEW WITH COVER REMOVED
4
BLOCK DIAGRAM
MDA1000
DIGITAL INPUT
DATA PORT
IR INPUT
DATA INPUT
IN
POWER
CONTROL
OUT
120VAC 50/60Hz
MUTE
COAXIAL
1
COAXIAL
2
COAXIAL
3
OPTICAL
4
OPTICAL
5
OPTICAL
6
XLR
7
1
2
3
4
5
6
7
POWER
CONTROL
POWER SWITCH
DIFFERENTIAL
DATA PORT
DRIVER
SENSOR
FUSE
AMP
IR
POWER
TRANSFORMER
INPUT LEVEL
SELECT
SETUP
CONTROLS
DIGITAL
INTERFACE
RECEIVER
MICROCONTROLLER
DISPLAY
DISPLAY
POWER
CONTROL
RELAY
DRIVER
DIVIDER
V. F.
BCK
DATA
LRCK
MCK
S/F
LOW VOLTAGE
RESET
DISPLAY ANALOG
VOLTAGE
SUPPLY
DIGITAL
SUPPLY
768KHz
UPSAMPLING
MODULE
5V
15V
-15V
-5V
3.3V
5V
BCK
LRCK
LD ATA
RD ATA
LEFT +
24BIT
D/A
CONVERTER
LEFT +
24BIT
D/A
CONVERTER
LEFT -
24BIT
D/A
CONVERTER
LEFT -
24BIT
D/A
CONVERTER
RIGHT +
24BIT
D/A
CONVERTER
RIGHT +
24BIT
D/A
CONVERTER
RIGHT -
24BIT
D/A
CONVERTER
RIGHT -
24BIT
D/A
CONVERTER
LEFT +
I/V
CONV.
LEFT -
I/V
CONV.
RIGHT +
I/V
CONV.
RIGHT -
I/V
CONV.
LEFT
BALANCED
OUTPUT
LEVEL
CONTROL
RIGHT
BALANCED
OUTPUT
LEVEL
CONTROL
BYPASS
CONTROL
RELAY
BYPASS
CONTROL
RELAY
BYPASS
CONTROL
RELAY
BYPASS
CONTROL
RELAY
LEFT + FILTER
LEFT -
FILTER
RIGHT +
FILTER
RIGHT -
FILTER
LEFT
DIFFERENTIAL
AMP
RIGHT
DIFFERENTIAL
AMP
LEFT +
BALANCED
AMP
LEFT -
BALANCED
AMP
RIGHT +
BALANCED
AMP
RIGHT -
BALANCED
AMP
RELAY
MUTE
RELAY
MUTE
RELAY
MUTE
RELAY
MUTE
RELAY
MUTE
RELAY
UNBALANCED
+
BALANCED
-
RIGHT
UNBALANCED
+
BALANCED
-
LEFT
LEFT
OUTPUTS
RIGHT
5V
3.3V
STANDBY
LOW VOLTAGE
SUPPLY
5 6
1
INTERCONNECT
6
DATAPORT
2
MAIN
GND
GND
REM
GND
GND
J1
LCLK
GND
SCLK
GND
DATA
GND
1
NS5V
3
MODULE
GND
1
J13
120V AC
50/60Hz
NS5V
GND
DATA 1
GND
SCLK1
GND
LCLK1
GND
GND
GND
REM
049999
J12
240V
0V B
0V B
0V B
VIO
0V B
J11
J10
J9
1
0V A
120V A
100V A
220V
1
0V A
120V A
100V A
120V
1
0V A
120V A
100V A
BLK
GRY
BLU
100V
1
0V A
120V A
100V A
WHT
BLK
6
20V B
120V B
6
20V B
FIL
5VD
FIL
1
GND
-29V
GND
LCLK2
J6
DATA 2
STBY/ON
BYPASS LED
NS5V
GND
GND
GND
LEVB
INPUT CCW
INPUT CW
REM
SETUP LED
LEVA
J14
8
AC6V
AC6V
AC14V
AC26V
AC26V
AC14V
AC26VCT
AC14VCT
YEL
YEL
BLU
BLK
GRN
RED
GRN
RED
J8 J7
1
AC H
AC L
SETUP
BLK
SCLK2
120V B
6
20V B
120V B
WHT
ORN
6
20V B
120V B
KEYBOARD
4
DISPLAY
5
GND
SETUP LED
SETUP
KBLED
GND
REM
J1
GND
STBY/LED
NS5V
STBY/ON
GND
1
GND
FIL1
FIL2
GND
SETUP LED
SETUP
KBLED
GND
J2
REM
GND
NS5V
GND
STBY/ON
GND
STBY/LED
1
GND
GND
GND
NS5V
BLK
CL
LEVB
SETUP
1
J1
INPUT CCW
INPUT CW
SETUP LED
REM
LEVA
NC
STBY/ON
DI
CE
GND
-29V
GND
5VD
GRN
GRN
YEL
BLU
YEL
RED
BLK
RED
BLK
T1
BLK
BLU
GRY
VIO
ORN
WHT
7 8
S1
POWER
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