Mcintosh c 30 service manual
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Page 1
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CONTENTS
Performance Specifications ................... 2 Section 4 - Input and Mode Switch ....... 24-26
Front and Top Views ......................... 3 Section 5 - Loudness and Balance ....... 27-28
Rear View ................................... 4 Section 6 - Equalizer ................... 29-33
General Notes ............................. 4 Section 7 - Outputs and Power Supply. . . .34-39
Block Diagram ............................ 5-6 Equalizer Amp.
Section Locations ........................... 7 Headphone Amp.
interconnection Diagram Parts List ............ 8 Turn on Delay
Front Panel and Trim Parts List ................ 8 Power SUPPY
Installation Hardware Parts List ............... 8 Switched Outputs
Section 1 - Interconnection Diagram ....... 9-11 High and Low Filters
Section 2 - Signal Switching Tape Control
(left channel) ................ 12-17 Section 8 - Auto-on ..................... 40-42
Phono Amp. Repacking instructions ...................... 43
Mono Switching
Tape Output Switching
Tape Copy Switching
Section 3 - Signal Switching
(right channel) ............... 18-23
Phono Amp.
Mono Switching
Tape Output Switching
Tape Copy Switching
mEIIIIUSHE Service Manual
Page 2
Performance
Specifications
FREQUENCY RESPONSE
+ 0, -0.5dB from 20Hz to 20,000Hz
MAXIMUM VOLTAGE OUTPUT
Main and Tape Output- 10V from 20 to 20,000Hz
Line/ Headphone Output- 9V (1.3V with 8 ohm
headphones) from 20 to 20.000Hz
TOTAL HARMONIC DISTORTION
.007% maximum from 20 to 20,000Hz at 2.5V rated
oUtput
SENSITIVITY
Phono- 2mV for 25V rated output (0.4mV IHF)
High Level- 200mV for 2.5V rated ouptut
(40mV IHF)
SIGNAL TO NOISE RATIO, A-WEIGHTED
Phono- QOdB below 10mV input (84dB IHF)
High Level- 100dB below rated output (86dB lHF)
MAXIMUM INPUT SIGNAL
Phono- 100mV
High Level- 10V
INPUT IMPEDANCE
Phono- 47k ohms and 65pF capacitance
High Level- 22k ohms
VOLTAGE GAIN
Phono to Tape- 40dB
Phono to Main- 62dB
Phono to Headphone / Line- 68dB
(51 dB with 8 ohm headphones)
High Level to Tape- OdB
High Level to Main- 22dB
High Level to Headphone / Line- 28dB
(11dB with 8 ohm headphones)
EQUALIZATION CONTROL
Variable 12dB boost to 12dB cut at center
frequencies of 30, 150, 500, 1500, 10kHz
LF-HF FILTER
Flat or roll-off at 12dB per octave below 50Hz and
above 7,000Hz
General Information
SEMICONDUCTOR COMPLEMENT
28 Bipolar Transistors
66 Field Effect Transistors
15 Integrated Circuits
91 Diodes
1 Silicon Controlled Rectifier (SCR)
Ac POWER OUTLETS
1 Turntable current-sensing, green, 100 watts
6 Switched, black, and 1 unswitched, red, 1200
watts total
POWER REQUIREMENTS
120 volts, 50/60Hz, 25 watts
Mechanical Information
WEIGHT
18 pounds (8.2kg) net, 30 pounds (13.6kg) in
shipping carton