Mcintosh Ms750 User manual

Performance Speciﬁcations..........................................2

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

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

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

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

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

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

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

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

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

CONTENTS

SERIAL NO. XU1001 And Above

MS750

MUSIC SERVER

SERVICE MANUAL

Serial Number XU1001 And Above

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 speciﬁed:

a. Resistor values are in ohms.

b. Capacitor values are microfarads (uF).

c. Inductor values are in microhenries (uH)

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.

NOTES

SAFETY INFORMATION

PERFORMANCE SPECIFICATIONS

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 speciﬁed 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.

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

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)

Audio Speciﬁcations

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 Speciﬁcations

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/CROutput 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 Speciﬁcations

Digital Output

Optical: -15dbm to -21dbm

Coaxial: 0.4V p-p to 0.6V p-p /75 ohm

COMPLIES WITH DHHS RULES

21 CFR 1040.10 AND 1040.11

REAR PANEL

SECTION LOCATIONS

TOP VIEW WITH COVER REMOVED

MS750

NOTES

INTERCONNECT

MS750

NOTES

MS750

FRONT PANEL 750621 SCH

MS750

FRONT PANEL 750621 PCB

910

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 sus-

pected in these modules, contact factory for service options.

PARTS LIST

MS750

Ref. No.Description Part No.

320243 MAIN PCB

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

320256 SERIAL RS232 PCB

See Note

320245 AUDIO EXPANSION PCB

See Note

320255 SPDIF PCB

See Note

320252 S LINK PCB

See Note

320244 CD ROM PCB

See Note

320242 HARD DRIVE

See Note

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

NOTES

REPACKING INSTRUCTIONS

MS750

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.