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Crown D-75 Service Manual

Crown D-75
64 pages
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0-75
DUAL-CHANNEL
POWER
AMPLIFIER
SERVICE MANUAL
CROWN INTERNATIONA
L,
INC. 17
18
W. MISHAWAKA
RD.
ELKHART,
IN
46517·4095
C 1989
Crown
International. Inc.
K80
1
86A6
3'
89

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Crown D-75 Specifications

General IconGeneral
CoolingConvection cooled
Frequency Response20Hz - 20kHz
Total Harmonic Distortion<0.05% at rated power
Signal to Noise Ratio>100 dB
Input Sensitivity0.775V for rated power
Weight10 lbs
Damping Factor>400
Input Impedance20 kOhms balanced, 10 kOhms unbalanced
Dimensions19" W x 1.75" H x 8.5" D

Summary

FULL THREE-YEAR WARRANTY

SUMMARY OF WARRANTY

Provides a summary of the product warranty terms and duration, covering defects in materials and workmanship.

ITEMS EXCLUDED FROM WARRANTY

Lists specific conditions and damages not covered by the warranty, such as misuse, accident, or neglect.

WHAT WE WILL DO

Outlines Crown's responsibilities for repairing or replacing defective products, including refund options.

HOW TO OBTAIN WARRANTY SERVICE

Provides instructions for initiating and receiving warranty service, including contact and shipping procedures.

2 Facilities

L. Fuse

Explains the AC line safety fuse and its required ratings.

3 Required Test Equipment

Oscilloscope

Monitors output during service and testing.

Volt-Ohmmeter

Checks resistance and voltages for service.

4 Maintenance

4.1 Safety First!

Essential safety precautions before servicing the unit, including electrical shock prevention.

4.3 Disassembly

Procedures for disassembling the amplifier for service access, including cover and board removal.

4.5 Troubleshooting

Guides users through identifying and resolving problems with the amplifier, starting with symptoms.

4.5.2 Test Procedures

Outlines specific tests and their expected results for service and checkout.

6 Circuit Theory

6.8 Protection Circuitry

Explains the voltage-current limiting protection mechanisms against hazards.

7. Specifications

7.1 General Specifications

Lists general performance parameters and physical characteristics of the amplifier.

7.2 Monaural Specifications

Specifies performance metrics for monaural operation.

7.3 Stereo Specifications

Specifies performance metrics for stereo operation.

Appendix A: Installation

A.2 Wiring

Details on connecting inputs, outputs, and stereo/mono modes, with wiring differences.

Appendix B: Operation

B.1 Precautions

Recommended precautions for safe and optimal amplifier operation, covering input levels and handling.

B.3 Protection

Explains the amplifier's built-in protection features against various hazards.

B.4 Fuse Replacement

Step-by-step instructions for safely replacing the amplifier's fuse.

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