Crown D-75 Service Manual

ill ustration
1 .1 0·75 ...................................................... ..
2. 1 Front Facilities (0.75) ................................ .
2.2 Rear Facilities
(0·75) ............ ..................... .
4 .1 2 Ohm Load Wavefonn ............................. ..
4.2
10KHz Square Wave .................................. .
4
.3 20KHz Sine Wave ..................................... .
4.4
1M Distortion Test Se(·up .......................... ..
4.5 Signal to Noise Test Set·up ........................ ..
5.1 AC Mains Voltage Conversion ... _ ............... ..
6.1 0- 75 Block Diagr$l .................................. .
6.2 Balanc ed Input Sta~e ................................. .
6.3 In put Operati onal Amplifier. ....................... ..
6.4 Signal Translato r ............................. ... ...... ..
6.5 Final Voltage.Amplifier .. .................. .. ....... ..
, .,
2·'
2·2
4·)
4-3
4·)
44
44
5 ·1
6-1
6-2
6·2
6·2
6-3
6.6 Bias, Output and Protection Stages................. 6·3
6.7 IOC ........................................................ 64
6.8 Signal Presence Indicator ............................ .
7.1 Power Matrix .......................................... ..
7.2 Nominal Frequency Responce ..................... ..
7.3 Nominal Output Impzdance. ....................... ..
7.4 Nominal Phase Respon ce ........................... ..
7.5 Nominal Power Efficien cy .......................... .
7.6 Nominal Damping Factor ..........................
..
7.7 Nomi nal Output Phase Angle ....................... .
7.8 Nominal Crosstalk. ........ ............................ .
7.9 Nominal Noise Spectrum .................... .. ...... .
8.1
0- 75 Schematic Diagrams .............. .. ........... .
9. 1 0- 75 Main Modules .................................. ..
9.2
Output Modu l e< ......................................... .
9.3 D-75 Front Pan el Assernbly ......................... .
9.4
0-75 Neon Bracket Assembly .................... ..
9.5
0·75 Back Panel Assembly ......................... .
9.6
D-7 5 Ca pa ci tor Bracket Asse mbl y ............... ..
9.7 D -75 Final Assembly ................................ ..
A.1 0- 75 Mounting OimentiooS" ..................... ..
A.2 Input High Pass Filter ..... .. .. ....................... .
A.3 InpUi Low Pass Filter ................................ .
A.4 Wire Ga u ge Nomograph ............................ .
A.5 Connection to an Inductive Load. ................ ..
A.6 Fuse Nomog r aph ............................. ......... .
64
7·)
74
74
7·5
7·5
7·6
7·6
7·7
7·7
g·l
9·2 .3
9·9
9·11,
12 , I3
9·16
9·17
9- 19
9·20
A· I
A·2
A·2
A·3
A·3
A4

Crown D-75 Specifications

General

Cooling	Convection cooled
Frequency Response	20Hz - 20kHz
Total Harmonic Distortion	<0.05% at rated power
Signal to Noise Ratio	>100 dB
Input Sensitivity	0.775V for rated power
Weight	10 lbs
Damping Factor	>400
Input Impedance	20 kOhms balanced, 10 kOhms unbalanced
Dimensions	19" W x 1.75" H x 8.5" D