McIntosh MCD 7007 Service Manual

Page 1

MCD 7007

COMPACT DISC PLAYER

CONTENTS
Performance Specifications ............................... 2
Notes ................................................. 2
Mechanical Views ....................................... 3-4
Front Panel and Trim Parts List ........................... 4
installation Parts List .................................... 4
Block Diagram .......................................... 5
Section Locations ....................................... 6
Section 1 - Interconnection Diagram ...................... 7-9
Section 2 -- A/C Relay ................................. 10-11
Section 3 - Servo and Laser ........................... 12-15
Section 4 - Decoder and Power Supply .................. 16-21
Section 5 - Illumination ............................... 22
Section 6 -- Control ................................... 23-26
Section 7 - Display and Keyboard ...................... 2731
Section 8 - Audio ..................................... 32-34
Section 9 - Headphone ................................ 35-36
Service Tests and Adjustments .......................... 37-42
Servo and Laser Waveforms ............................ 43-46
Decoder and Power Supply Waveforms ................... 46-49
Repacking Instructions ................................. V 50

Ultlninsfi Service Manual

Page 2

Performance
Specifications

TYPICAL AUDIO PERFORMANCE
NUMBER OF CHANNELS
2, left and right

FREQUENCY RESPONSE
20-20,000Hz, +0, -o.3da
DYNAMIC RANGE
96dB (11th EIA)

SIGNAL-TO-NOISE RATIO
107dB (A)

CHANNEL SEPARATION
iOZdB (at 1000H2)

TOTAL HARMONIC DISTORTION
0.0012% (at TOOOHZ)

WOW AND FLUTTER
Quartz crystal precision

SAMPLING RATE
176.4kHZ

D/A CONVERSION
Quadruple oversampling (176.4kHz)
with digital filter and two 16 bit
D/A Converters

ERROR CORRECTION SYSTEM
Cross Interleave Reed Solomon Code
(CIRC)

AUDIO OUTPUT LEVEL
2.5V

IMPEDANCE HEADPHONES
8-1000 ohms

DIGITAL OUTPUT
Output for digital signal processing

Notes

Unless otherwise noted, all voltages
indicated on the following schematics
are measured under the following
conditions:

a. AC input at 120 volts,
b.

2.

50/60Hz.
All voltages are 210% with
respect to ground. A high
impedance (10 megohm) voltmeter
must be used.

OPTICAL READOUT SYSTEM
LASER
Semiconductor AlGaAs

WAVE LENGTH
780nm

SIGNAL FORMAT
SAMPLING FREQUENCY
4h . 1 kHz

QUANTIZATION
16 bit linear/channel

DISC
SCANNING VELOCITY
1.2 to 1.4 m/s

ROTATION SPEED
500-200 rpm

PLAYING TIME (maximum)
74 minutes (stereo)

GENERAL INFORMATION
POWER SUPPLY
120V, SO/SOHZ, 30 watts
WEIGHT
18 pounds (8.2 kg) net,
(13.6 kg)

30 pounds
in shipping carton.

Unless otherwise specified:
a. Resistor values are in ohms.

b. Capacitor values smaller then 1
are microfarads (uF), and
capacitor values greater than 1
are in picofarads (pF).

c. Inductor values are in

microhenries (uH) .