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GAI-Tronics PA250-001 Manual Download Page 3

Pub.  42004-340E

Model PA250-001 250 Watt Central Amplifier

Page:  3 of 12

f:\standard ioms - current release\42004 instr. manuals\42004-340e.doc

06/02

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:

•

 

Chassis

•

 

AC power input transformer

•

 

Audio line output transformer

•

 

Output power amp/heatsink PCBA

•

 

Audio input PCBA

Figure 2.  Component Subassembly Detail – Top view (cover removed)

Summary of Contents for PA250-001

Page 1: ...ay 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...

Page 2: ... openings Install in accordance with the manufacturer s instructions 8 Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 9 Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other one A grounding type plug has two blades and a third grou...

Page 3: ...ncludes external components accessible to the user as well as internal components or subassemblies InternalComponents The assembly contains the following major components or subassemblies Please refer to Figure 2 below Chassis AC power input transformer Audio line output transformer Output power amp heatsink PCBA Audio input PCBA Figure 2 Component Subassembly Detail Top view cover removed ...

Page 4: ...audio peaks that approach the rated output VOLUME master output level control of the amplifier CB circuit breaker primary ac protection for amplifier that provides a visual indication of a trip condition The amplifier s rear view includes the following components Refer to Figure 4 below AC power cord AC convenience outlet Audio input terminal block connections for Tel Page and 600 ohm Tel Page 600...

Page 5: ...ing on the proper V matched line matching transformer determines the individual speaker s power level Use of these transformers allows the speakers to be placed at longer distances from the amplifier without significant power loss The number of speakers for a line driven central amplifier system is limited to the power available from the amplifier Note The sum of all of the connected speakers powe...

Page 6: ...2923 6393 1950 4795 1462 3197 974 1918 585 1279 390 959 292 767 234 14 2 08 5 04 1060 15 12100 3688 6051 1844 4034 1230 3025 922 2017 615 1210 369 806 246 605 184 484 148 16 1 31 8 04 707 10 7586 2312 3793 1156 2529 771 1896 578 1264 385 758 231 505 154 379 116 303 92 18 0 82 12 78 494 7 4772 1454 2386 727 1591 485 1193 364 795 242 477 145 318 97 238 73 190 58 of full loading 4 0 8 0 12 0 16 0 24 ...

Page 7: ...ired rack location and secure with proper rack mounting hardware customer supplied For best protection to the amplifier s mounting hole finish the use of nylon or plastic washers is recommended Note To meet the two rack space 2U spacing the amplifier s rubber feet must be removed To remove them flip the unit upside down and remove the Phillips screw located in the center of each foot Ventilation T...

Page 8: ...to 600 ohm or Tel Page input terminals will mute the two high impedance paralleled inputs unless defeated by the user This mute feature is defeated by moving an internal jumper located on the input PCBA which is mounted on the back panel adjacent to the audio input terminal block connections WARNING Performing this AUTO MUTE defeat modification requires the opening of the unit This action should b...

Page 9: ...ce ohm for 250 W Full Output 25 V 2 5 ohm 70 7 V 20 ohm Operation This section describes the operation of the Model PA250 001 Amplifier 1 Turn the front panel s master VOLUME control CCW for the initial system startup Turn the front panel ac power switch to ON 2 Apply the proper audio signal level to the desired input connection 3 Adjust the master VOLUME control to the desired speaker audio outpu...

Page 10: ...t has proper ac voltage available No front panel POWER ON indication Unit s ac circuit breaker is tripped Depress the plunger to reset Check the internal low voltage power supply fuses on both amplifier boards Blown internal F1 F2 fuses Check F1 F2 fuses located on both power amp PCBAs CAUTION Replace with the same type value fuse No input signal source Verify that proper signal level is being sup...

Page 11: ...rference Input and or output signal cables may be routed too close to high voltage high electromagnetic sources Reroute cables away from high voltage high electromagnetic sources Use shielded cables Specifications Electrical Input voltage 114 126 V ac 60 Hz only 120 V ac nominal Input power consumed nominal V in Idle Full out w 1K tone 10 9 W 19 2 VA 514 W 648 VA Output power with adequate ventila...

Page 12: ... Screw terminals Dual Hi Z inputs Paralleled RCA style jacks Audio Output Screw terminals AC convenience outlet Un switched grounded receptacle 2 amp maximum AC main power cord 6 foot with NEMA 5 15P plug Front panel LED indicators POWER ON Output PEAK Internal mute jumper user defeatable X2 for auto mute of Hi Z inputs Internal fuses PS DCV Bus and located on both Output Power Amp PCBAs F1 and F2...

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