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Crown D-75A User Manual

Crown D-75A
24 pages
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Operation Manual
D-45
Obtaining Other Language Versions:
To obtain information in another language about the use of this product, please contact your
local Crown Distributor. If you need assistance locating your local distributor, please contact Crown at 574-294-8000.
This manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible
situation which may arise during installation, operation or maintenance.
The information provided in this manual was deemed accurate as of the publication date. However, updates to this information may have
occurred. To obtain the latest version of this manual, please visit the Crown website at www.crownaudio.com.
Trademark Notice:
Crown, Crown Audio, Amcron and IOC are registered trademarks of Crown International. Other trademarks are the
property of their respective owners.
Some models may be exported under the name Amcron.
®
©2007 by Crown Audio
®
Inc., 1718 W. Mishawaka Rd., Elkhart, Indiana 46517-9439 U.S.A. Telephone: 574-294-8000
125243-10
10/07
D Series
D-75A
SIGNAL
IOC
CHANNEL 1 CHANNEL 2
HEADPHONES POWER
OFF ON
LEVEL
30
50
40
0
10
20
LEVEL
30
50
40
0
10
20

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Crown D-75A Specifications

General IconGeneral
BrandCrown
ModelD-75A
CategoryAmplifier
LanguageEnglish

Summary

Important Safety Instructions

Magnetic Field Considerations

FCC Compliance Notice

Declaration of Conformity

1 Welcome

1.1 Product Features

Lists key features like AB+B circuitry, IOC alerts, detented level controls, low distortion, and fanless cooling.

1.2 How to Use This Manual

Explains manual structure and provides guidance on setup, operation, and warranty registration.

2 Setup

2.1 Unpack Your Amplifier

Instructions for unpacking and inspecting the amplifier for transit damage, and advice on saving packing materials.

2.2 Install Your Amplifier

Safety precautions and guidelines for installing the amplifier in a rack or on a stable surface, ensuring proper ventilation.

2.3 Ensure Proper Cooling

Recommendations for maintaining adequate air space in rack installations to facilitate convection cooling.

2.4 Input Wiring and Connectors

Details on balanced and unbalanced input wiring, connector pin assignments, and the need for qualified custom wiring.

2.5 Output Wiring and Connectors

Guidance on selecting appropriate speaker wire gauge and connectors, and warnings against using shielded cables.

2.6 System Wiring Modes

Explains dual mode and bridge-mono mode wiring, including important notes on configuration and polarity.

2.7 AC Mains Connection and Voltage

Details on connecting to AC power, safety warnings about grounding, and voltage configuration options.

2.8 Startup Procedure

Step-by-step instructions for safely turning on the amplifier, including adjusting levels and power switch.

3 Operation

3.1 Precautions

General precautions for safe operation, performance optimization, and preventing damage, including headphone jack warnings.

3.2 Controls, Indicators and Connectors

Introduction to the front and back panel controls, indicators, and connectors used for operating the amplifier.

3.3 Indicators Explained

Details on the five front panel indicators: power, signal, and IOC (Input/Output Comparator) lights.

3.4 Controls Explained

Information on the power switch and detented level controls for adjusting output in dual and bridge-mono modes.

3.5 Fuse Replacement

Procedures and warnings for safely replacing the AC mains fuse, including correct fuse types and sizes.

4 Advanced Features and Options

4.1 Amplifier Protection Features

Overview of protection circuits that safeguard the amplifier against common hazards like shorted loads and power overloads.

4.2 Optional Configurations

Details on optional features such as bridge-mono operation and adjustable input sensitivity settings.

5 Troubleshooting

Common Issues and Solutions

Addresses common problems like no power, distorted sound, no sound, and no input signal with possible reasons and fixes.

6 Specifications

7 Service

7.1 International and Canada Service

Procedures for obtaining service and warranty support for units located outside the United States.

7.2 US Service Options

Details on obtaining service through authorized US service centers or directly from the Crown factory.

7.2.3 Factory Service Shipping Instructions

Guidelines for shipping products to the factory for service, including obtaining an SRA and proper packing.

7.2.4 Packing Instructions for Service

Essential instructions for packing the amplifier securely for shipment to prevent damage during transit.

7.2.5 & 7.2.6 Estimate & Payment

Information on estimate approval for repairs and payment procedures for non-warranty service.

8 Warranty

Summary of Warranty Coverage

Details the three-year warranty period, coverage for defects, and exclusions for new Crown products.

Items Excluded from Warranty

Specifies conditions like misuse, accidents, and negligence that are not covered by the warranty.

Warrantor's Commitment

Explains Crown's process for remedying defects via repair, replacement, or refund, and the conditions for each.

Warranty Service (US & Canada)

How to obtain warranty service within the US and Canada, including factory and service center options.

Disclaimers and Legal Rights

Addresses disclaimers for damages and outlines the specific legal rights afforded to the purchaser under the warranty.

Warranty Service (Worldwide)

Guidance on obtaining warranty service for products purchased and located outside the US and Canada.

Product Registration

Crown Audio Factory Service Information Form

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