Mcintosh mda1000 service manual

Page 1

MDA1000

D/A CO NVERTER

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MDAIDDD D/A CONVERTER

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CONTENTS

Performance Specifications
N otes .............
Rear Panel ..
Section Location
BlockDiagram
Interconnection D
Main Schematic and PCB

Keyboard Supply Schematic and PCB
Display Schematic and PCB
Dataport Schematic and PCB ..
Pans List ..............................
Exploded View and Pans List
Repacking Instructions ............

SERVICE MAN UAL

Page 2

PERFO RMAN CE SPECIFICATIO NS

Analog Audio Specifications

Frequency Response

+/-0.5dB from 41-12 to 45,0001-12

(Sampling Frequency v 96kHz and 88.2kHz)
+/-0.3dB from 4H2 to 22,000Hz

(Sampling Frequency - 48kl-lz)

+/-0.3dB from 4H2 to 20,000Hz

(Sampling Frequency - 44.1kHz)

+/-0.3dB from 41-12 to 15,0001-12

(Sampling Frequency - 32kl-lz)

Total Harmonic Distortion
0.002% at 1,000Hz

Signal To Noise Ratio
Better than llOdB (A Weighted)

Dynamic Range
Better than lOOdB (1,000Hz)

Rated Output Voltage

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

Digital Audio Format
lEC958, S/PDIF

Coaxial Inputs (1, 2 and 3)
0.5V p-p @ 750hms

Optical Inputs (4, 5 and 6)
-15 ~ ~20dBm

XRL Input (7)
5V p-p @ 1100hms

Sampling Frequencies
96kl-lz,48kHz.44.1kl-lz and 32kl-lz

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 nfthe 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

Weight
24 pounds (10.89kg) net, 38 pounds (17.24kg) in
shipping carton

NOTES

. The heavy notes on the schematic denote the primary
signal path.

Unless otherwise noted, all voltages indicated on the
schematics are measured under the following conditions:
a. AC input at 120 volts, 50/601-12

b. All voltages are +/-10% with respect to ground. A

high impedance (10 megaohm) voltmeter must be used.

. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).

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 A have critical
characteristics. Use only replacement parts recom-
mended by the manufacturer.