McIntosh MS-750 Service manual

MS750

MUSIC SERVER

SERIAL NO. XU1001 And Above

CONTENTS

Performance Specifi cations ..........................................2

Notes ........................................................................... 2

Safety Information ......................................................2

Rear Panel ...................................................................3

Section Location ..........................................................3

SERVICE MANUAL

Serial Number XU1001 And Above

Block Diagram ............................................................4

Interconnection Diagram .............................................5

Front Panel Schematic and PCB ........................... 7 - 10

Parts List ....................................................................11

Repacking List ...........................................................17

PERFORMANCE SPECIFICATIONS

Audio Specifi cations

Output Level – 2.0Vrms
Output Impedance – 200 ohms
Audio Frequency Response – 2Hz to 22,000Hz ±1dB
Signal to Noise Ratio – 102dB (IHF A-Weighted)
Dynamic Range – 96dB
Harmonic Distortion – 0.01%
Channel Separation – 95dB (1,000Hz)

Video Specifi cations

Signal System – NTSC/PAL
Component Video Output Level

Y Output Level 1.0Vp-p (75 OHM)
PB/CB Output Level 0.648Vp-p (75 OHM)
PR/CR Output Level 0.7Vp-p (75 OHM)

S-Video Y Output Level – 1Vp-p (75 OHM)
S-Video C Output Level – 0.286Vp-p (75 OHM) (NTSC)
Composite Video Output Level – 1Vp-p (75 OHM)

General Specifi cations

Digital Output

Optical: -15dbm to -21dbm
Coaxial: 0.4V p-p to 0.6V p-p /75 ohm

Digital Signal Format – Sampling Frequency: 44.1kHz
Power Requirements

100 Volts, 50/60Hz at 60 watts
110 Volts, 50/60Hz at 60 watts
120 Volts, 50/60Hz at 60 watts
220 Volts, 50/60Hz at 60 watts
230 Volts, 50/60Hz at 60 watts
240 Volts, 50/60Hz at 60 watts

Note: Refer to the rear panel of the MS750 for the correct voltage.

Overall Dimensions

Width is 17-1/2 inches (44.45cm)
Height is 6 inches (15.24cm)
Depth is 15-7/8 inches (40.32cm)

Note: When the Disc Tray is opened, the panel clearance required in
front of mounting panel is 6-3/4 inches (17.2cm).

Weight

28.1 pounds (12.8Kg) net, 44.5 pounds (20.2Kg) in shipping
carton

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)

NOTES

1. 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.

2. Unless otherwise specifi ed:
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 specifi ed in the Owners
Manual may result in Hazardous
Radiation Exposure.

Servicing of laser mechanism is to be
performed at the service facility at
McIntosh Laboratory Inc.

3. On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1

4. WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom-
mended by the manufacturer.

5. Use McIntosh Remote Control Model HR063 with the MS750.

COMPLIES WITH DHHS RULES

21 CFR 1040.10 AND 1040.11

This product incorporates an embedded CLASS 3B Laser (IEC60825-1).

2

REAR PANEL

MS750

SECTION LOCATIONS

TOP VIEW WITH COVER REMOVED

3

NOTES

4