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RELIABILITY

J.W. Davis & Company 

•  3030 Canton Street  •  P.O. Box 710219  •  Dallas, Texas 75371-0219

Sales 800-527-5705 • Fax 800-388-9106 • Corp 214-651-7341 • Fax 214-939-0328 • [email protected] • www.jwd.com

USER’S MANUAL

The Mark of the Professional...

090705123

Unpacking Procedures

The Back Panel

Specifications

The Auto-Mute Circuit

Troubleshooting

The Front Panel

Maintenance

Installation Information

Speaker Installation

Using Horn Speakers

Product Overview

Product Description

Warranty & Service

Accessories

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Schematic

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D-250AL POWER AMPLIFIER

Содержание D-250AL

Страница 1: ...wd com www jwd com USER S MANUAL The Mark of the Professional 090705123 Unpacking Procedures The Back Panel Specifications The Auto Mute Circuit Troubleshooting The Front Panel Maintenance Installatio...

Страница 2: ...CAUTION These devices are not intended for use in hazardous locations as defined by the National Electrical Code NEC and by the National Fire Protection Association NFPA WARNINGS Features Rack mount...

Страница 3: ...xiliary input and set the controls for operation If the unit should be inoperable and no damage is noted please contact J W Davis Company s Customer Service Department for directions 800 527 5705 III...

Страница 4: ...push the button to reset If the circuit breaker will not reset have the unit serviced by a qualified technician 1 AC Line Cord Three conductor line cord for AC voltage 2 AC Convenience Outlet Grounded...

Страница 5: ...USING HORN SPEAKERS THE LOW CUT FILTER The D 250AL is equipped with a low cut filter that is activated by the LINE OUTPUT switch When the switch is in the IN position the 25 and 70 7 volt ouputs will...

Страница 6: ...0 7V line or overheated e g obstructed or poor ventilation of the unit mismatched line impedance the unit will fail to provide output Overloading and overheating of the amp can lead to premature outpu...

Страница 7: ...SCHEMATIC FOR D 250AL AMPLIFIER 7...

Страница 8: ...ohm tel page gain Check that the internal mute jumper is not disabled See page 7 Check 600 ohm tel page gain control setting recessed on back Low High or Distorted Level Volume setting Signal input le...

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