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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
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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).
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REAR PANEL
MS750
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED
3
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NOTES
4
Page 5
MS750
1
INTERCONNECT
5
Page 6
NOTES
6
Page 7
MS750
10
FRONT PANEL 750621 SCH
7
8
Page 8
MS750
10
FRONT PANEL 750621 PCB
9
10
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PARTS LIST
2
320243 MAIN PCB
3
750822 CHASSIS POWER SUPPLY PCB
Ref. No. Description Part No.
DIODE RECTIFIER 1N4007 070178
FUSE T3 12AH25OV PCB MOUNT 089144
DECAL FUSE T3.15AH 166304
POWER SUPPLY SWITCH MODE 75W 320247
4
320256 SERIAL RS232 PCB
See Note
5
320245 AUDIO EXPANSION PCB
See Note
6
320255 SPDIF PCB
See Note
7
320252 S LINK PCB
See Note
8
320244 CD ROM PCB
See Note
9
320242 HARD DRIVE
See Note
10
750621 FRONT PANEL PCB
Ref. No. Description Part No.
C1 CAP MONO .1UF 50V 20% Z5U 061346
D1 DIODE SILICON 070174
D2 DIODE SILICON 070174
D3 DIODE SILICON 070174
DS1 LED SQUARE RED 058109
DS2 LED SQUARE RED 058109
DS3 LED SQUARE RED 058109
DS4 LED SQUARE RED 058109
DS5 LED GRN 5MM HI-INTENSITY 058165
(DS5) SPACER LED 112108
DS6 LED GRN 5MM HI-INTENSITY 058165
(DS6) SPACER LED 112108
DS7 LED GRN 5MM HI-INTENSITY 058165
(DS7) SPACER LED 112108
DS8 LED GRN 5MM HI-INTENSITY 058165
(DS8) SPACER LED 112108
DS9 DISPLAY VFD 2X20 CHAR 5X8 DOT 058181
DS9 TERMINAL STRIP 14 PIN .025 SQ 117647
TUBING SHRINK 1/4ID BLK 077041
J1 CONN HEADER SHROUDED 1 X 14 117920
J2 CONN HEADER SHROUDED 1 X 14 117920
J3 CONN HEADER STRAIGHT 1 X 5 117874
J4 TERMINAL STRIP 14 PIN .025 SQ 117647
J5 CONN HEADER STRAIGHT 1 X 5 117874
MT1 SENSOR IR 38KHZ 121046
MS750
Ref. No. Description Part No.
PCB1 PC BD DISPLAY 129806
Q1 TRANSISTOR PNP SILICON 132304
Q2 TRANSISTOR PNP SILICON 132304
Q3 TRANSISTOR PNP SILICON 132304
Q4 TRANSISTOR PNP SILICON 132304
Q7 TRANSISTOR PNP SILICON 132304
Q8 TRANSISTOR NPN SILICON 132317
R1 RES MF 2.21K 1% 1/4W 144584
R2 RES MF 221 OHM 1% 1/4W 144559
R3 RES MF 221 OHM 1% 1/4W 144559
R4 RES MF 221 OHM 1% 1/4W 144559
R5 RES MF 324 OHM 1% 1/4W 144597
R6 RES MF 10K 1% 1/4W 144504
R7 RES MF 100 OHM 1% 1/4W 144568
R8 RES MF 100 OHM 1% 1/4W 144568
R9 RES MF 100 OHM 1% 1/4W 144568
R10 RES MF 100 OHM 1% 1/4W 144568
R11 RES MF 1K 1% 1/4W 144513
R12 RES MF 1K 1% 1/4W 144513
S1 SWITCH TACT 150058
S2 SWITCH TACT 150058
S3 SWITCH TACT 150058
S4 SWITCH TACT 150058
S5 SWITCH TACT 150058
S6 SWITCH TACT 150058
S7 SWITCH TACT 150058
S8 SWITCH TACT 150058
S9 SWITCH TACT 150058
S10 SWITCH TACT 150058
S11 SWITCH TACT 150058
S12 SWITCH TACT 150058
S13 SWITCH TACT 150058
S14 SWITCH TACT 150058
S15 SWITCH TACT 150058
S16 SWITCH TACT 150058
S17 SWITCH TACT 150058
(DS1) LED SPACER .220 LENGTH 163001
(DS2) LED SPACER .220 LENGTH 163001
(DS3) LED SPACER .220 LENGTH 163001
(DS4) LED SPACER .220 LENGTH 163001
C/A DISPLAY 14-1 X 2.0 171823
SCR TS 2-32 X 1/4 PH PN TYPE B 401161
NOTE:
Modules not available as replacement parts. If defect is suspected in these modules, contact factory for service options.
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NOTES
12
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REPACKING INSTRUCTIONS
MS750
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MS750
MUSIC SERVER
SERIAL NO. XU1001 And Above
The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design without notice. Because
of the constant upgrading of McIntosh products’ circuitry and components, the Company cannot insure, and does not warrant, the accuracy of the within schematic
material, which is intended for information only.
McINTOSH LABORATORY, INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK 13903 Printed in U.S.A. Part Number 041106
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