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250 Watt Central Amplifier
Confidentiality Notice
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary to GAI-Tronics.
GAI-Tronics retains all intellectual property and other rights in or to the information contained herein,
and such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
General Information
Product Overview
The Model PA250-001 250 Watt Central Power Amplifier is designed for use in public address systems.
It can be mounted in standard, commercially available 19-inch racks and cabinets, or placed on a table or
shelf. This manual describes the installation, operation, and maintenance of the amplifier.
System Requirements and Limitations
The Model PA250-001 is designed to be connected to 8-ohm speakers via the direct 8-ohm connection, or
connected to speakers with variable-impedance, line matching transformers designed to match the
amplifier's line output voltage of 25 V or 70.7 V.
GAI-Tronics Corporation P.O. Box 1060, Reading, PA 19607-1060 USA
610-777-1374 n 800-492-1212 n Fax: 610-775-6540
V
ISIT WWW
G A I - T R O N I C S ® C O R P O R A T I O N
A H U B B E L L C O M P A N Y
Model PA250-001
Figure 1. Model PA250-001 Outline – Front View
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GAI
TRONICS
COM FOR PRODUCT LITERATURE AND MANUALS
Pub. 42004-340E
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Summary of Contents for GAI-Tronics PA250-001
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Page 1: Confidentiality Notice
This manual describes the installation, operation, and maintenance of the amplifier. System Requirements and Limitations The Model PA250-001 is designed to be connected to 8-ohm speakers via the direct 8-ohm connection, or connected to speakers with variable-impedance, line matching transformers designed to match the amplifier’s line output voltage of 25 V or 70.7 V. -
Page 2: Features And Functions
Pub. 42004-340E Model PA250-001 250 Watt Central Amplifier Page: 2 of 12 Features and Functions • Internal power supply with soft start • Compact 19-inch rack mountable design (2U {with feet removed}) • Rear-mounted speaker connection terminals for direct 8-ohm bridge output or transformer isolated outputs for 25 V/70.7 V (CLASS 2) line operation... -
Page 3: Description Of Major Components
Pub. 42004-340E Model PA250-001 250 Watt Central Amplifier Page: 3 of 12 Description of Major Components This assembly includes external components accessible to the user as well as internal components or subassemblies. Internal Components The assembly contains the following major components or subassemblies. Please refer to Figure 2 below: •... - Page 4 Pub. 42004-340E Model PA250-001 250 Watt Central Amplifier Page: 4 of 12 External Components The Model PA250-001 Amplifier’s front panel includes the following components. Refer to Figure 3 below: • POWER ON switch: controls the main ac power to the amplifier.
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Page 5: Block Diagram
Pub. 42004-340E Model PA250-001 250 Watt Central Amplifier Page: 5 of 12 Block Diagram The block diagram for the Model PA250-001 Amplifier is shown below: Figure 5. Model PA250-001 Block Diagram Speakers For Direct 8-ohm Operation: Use speakers of proper voice coil impedance and power handling capability. - Page 6 Pub. 42004-340E Model PA250-001 250 Watt Central Amplifier Page: 6 of 12 Speaker Wiring Guidelines Cable distance should be kept as short as possible to keep power loss at a minimum. The following chart can be used as a general guide showing five typical wire sizes and the maximum distance related to cable loading that speakers can be placed from the central amplifier for a –1 dB loss (-20% power).
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Page 7: Rack Mount Installation
Pub. 42004-340E Model PA250-001 250 Watt Central Amplifier Page: 7 of 12 Installation WARNING Please follow below recommendations and instructions for installation. CAUTION These installation instructions are for use by qualified service personnel only. To reduce the risk of electric shock, DO NOT perform any servicing other than contained in the operating instructions unless you are qualified to do so. -
Page 8: Speaker Output Connections
Pub. 42004-340E Model PA250-001 250 Watt Central Amplifier Page: 8 of 12 600-ohm (balanced) and Tel-Page (balanced) Input The 600-ohm balanced input and the Tel-Page balanced input (600-ohm) connections are made via screw terminals on the rear audio input terminal block. Observe +/- polarity for proper signal phasing. Refer to the Specification section for input sensitivity levels associated with the various inputs. -
Page 9: Operation
The Model PA250-001 Amplifier contains two DCV bus fuses on each Output Power Amp PCBA, as shown on Figure 2. Insure that replacement fuses are only UL-listed, 5A, 250V, Fast Blow, 0.25 x 1.25 inch. -
Page 10: Troubleshooting
If the equipment requires service, contact your Regional Service Center for a Return Authorization number (RA #). Equipment should be shipped prepaid to GAI-Tronics Corp. with a Return Authorization number and a Purchase Order number. If the equipment is under warranty, repairs or a replacement will be made in accordance with GAI-Tronics’... -
Page 11: Specifications
Pub. 42004-340E Model PA250-001 250 Watt Central Amplifier Page: 11 of 12 Problem: Possible Cause: Possible Solution: • Low audio output VOLUME setting Check VOLUME control setting on front panel. • Check 600 ohm/Tel-Page gain level setting (rear), if applicable. -
Page 12: Replacement Parts
Pub. 42004-340E Model PA250-001 250 Watt Central Amplifier Page: 12 of 12 Input Z of signal inputs: 600-ohm input:....................600 ohm (nominal) Hi-Z input: ....................10 kilohm (nominal) Tel-Page (BAL) input:..................600 ohm (nominal) Start-up delay time:.....................2 seconds (nominal) General: Temperature range: Operating: ......................
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