User Manual
Contents
1. Davis amp Company has been subjected to abuse or accident improper installation or alteration in any way If the D 500A fails to operate during this period return prepaid to J W Davis amp Company Warranty Service with a letter explaining the problem and proof of purchase Should you require further technical support please contact our Customer Service Department for assistance through any of the channels shown below NEW TECHNOLOGY OLD RELIABILITY Y DO Dauis amp Company e 3030 Canton Street PO Box 710219 Dallas Texas 75371 0219 Sales 800 527 5705 Fax 800 388 9106 Corp 214 651 7341 Fax 214 939 0328 sales jwd com www jwd com SYMPTON Power Indicator on Front Panel Does Not Glow Overload Indicator on Front Panel Glows Steadily No Audio Output No Automatic Muting of Input Signal Low High or Distorted Level KI TROUBLESHOOTING POSSIBLE CAUSE POSSIBLE SOLUTIONS S No AC power present e Verify the unit is receiving AC power e Verify the AC outlet has proper AC voltage available Unit s AC circuit breaker is e Verify the AC circuit breaker is not tripped If so depress the tripped plunger to reset e Verify the unit s internal fuse s has not tripped If it has replace the tripped fuse with the same type and value fuse Input or output impedance not e Check that the proper input output line impedance matches matched the selected input output connections used Signal in2. NFPA The D 500A is a 2 channel high fidelity commercial mono audio amplifier capable of delivering 500 watts of continuous RMS power into a direct coupled 8 ohm voice coil load or into a constant voltage 25V or 70 7V line Only 3 racks in height the D 500A uses a toroidal power transformer to reduce weight height and noise The D 500A designed for commercial sound or all in one telephone paging applications offers a balanced 600 ohm Tel Page input that is capable of muting the two high Imped ance inputs that are strapped in parallel Thereby offering a convenient auxiliary input bridge to addi tional amplifiers The 600 ohm Tel Page level is controlled via an independent tamper resistant control Features e 500 watts continuous RMS power e Multiple protections including relay short 40 8Q 25V or 70 7V outputs circuit and A C circuit breaker e Independent input gain control for 600 ohm telephone paging e Convection cooled reliable no maintenance design Rugged power supply designed for e Auxiliary RCA type Inputs for receiving source continuous use signal and bridging source signal out e Automatic voice activated Hi Z mutin e Fully isolated output transformer for 25 and 9 70 7 volt line operation e Rack mount standard 3 RU SPECIFICATIONS Auxiliary 2 RCA Connectors in Parallel for Input and Bridging High Impdeance Inputs Unbalanced 0 50V 10k Ohm Telephone Page Screw Terminal 50mV 600 Ohm Bal
3. Signal Matching Attenuator Matches Signal from Tuner or Other high Z Device to Amplifier MIC Input e Signal Matching Attenuator Matches Signal from Telephone Line or Other Low Z Device to Amplifier MIC Input e Signal Matching Attenuator Matches Signal from 70V Speaker Line Output to AUX Input of Second Amplifier 7 NEW TECHNOLOGY 4 gt OLD RELIABILITY Y DO Dauis amp Company e 3030 Canton Street PO Box 710219 Dallas Texas 75371 0219 Sales 800 527 5705 Fax 800 388 9106 Corp 214 651 7341 Fax 214 939 0328 sales jwd com www jwd com T jo L AV S3 90 L mu Jequiny L0S v00S Q 00 2 6 Sweusjj apg WO mmf eee AAA e 8 Pe ee WA ee en ae pc cen a eg Sereda rena A i 00 8 SIAVOMT E n AA a o Lives E li ZALZ ASS voL NEL MEA w Pa did vo a 1 OL pester ozz 4 S ISI aa i pa vsi9 sSL9 WA e A Ly cH eb Le NIKE i i WN anzy AOOL 3N00ZZ SHOLIOWAVO TY poa A001 Anzz y qa Hp SP XOL l H dl po y Y y ZEOSL3MN 7 an Lo 0 SPLUNI 001 h S o E a Wa ore Es a sai aan Z vol 108 E ANIS LV
4. 3H svig AST ee 105 4L Sip EEES sacs sec eee aes ase a bee oe ee ee eee 4 I i anol yol i 1 dno 7 an 100 i T yz 00 S asst o 5 iP F H 92 gt He tetas eos O ASES 7 Y N 8 58 dd 0001 Y9 eo annoz E 3 2 ne H X er LPN Savsan Ase anozz zo i ag i i i YA a gt Una yi joa ma aie NOS Aly A kia LSSSNZ ISSSNNZ i 1338 i ambe 1 Jai gs f 2 5 LsssNz AA y 02 sovsdW o 3 9 l Z N JO A 4d 001 nss N 3 a db Sofa 5 i 2 D oo 2 2 A X SN az D NER 3 P 1NdLnO NO aun i ozr 001 V6Z80d dd E cites as LOS A i j i gt ia O WAO ae ecosta LOvsNe i i 1 8 LPN NOWWOO vi i hy a ZZOS LANI i E LPNL A WHO 2 L ASZ MOTIZA ey a D D D E meee ws I l L 1 AZZ tt SAHO N3389 ee ron b i vezaod aNd INOS i peed e ASZ 9 SNHO8 3LIHM Sal A rn easel WOW costar i 3 2 3ONVHO WOL ANIS 1V3H wm SWHO 01 M O o on o oor H i SWHO 02 A00 LHWNH9 SOONE er S i e Ama ADE l f ae eg i AAA AAA Aa AOE t i Sr AA AAA A T TA AR ME 1 1 l Ps 8d MO 924 1 OMV MW 3WNTOA a IO 4 I A 189 H3LYSANI 3SVHA AE AAA Jana inows o OH A AA AA A oe re EAEE EIE IEI E ESE NEEE a a ee a AA AA EA E ES AA v vol ji 7 i ns 6 ESOS lar me MSA WNT SIHL LNO HILT MOT SLVAILOV
5. 7 5705 Fax 800 388 9106 Corp 214 651 7341 Fax 214 939 0328 sales jwd com www jwd com 1 VOLUME CONTROL Adjusts the master volume level of output for the amplifier 3 OVERLOAD INDICATOR This red LED will light flash at full power and on peaks A steady bright glow could indicate a shorted speaker line too much load or oscillation in the system 4 POWER SWITCH This switch turns the unit on or off 2 CIRCUIT BREAKER Pushing this plunger resets the circuit breaker should the breaker trip The circuit may need to be resetfor two reason 1 The amplifier is continuously being overloaded 2 The internal temperature surpasses the safe operating range NOTE Before resetting the circuit be sure to first correct the problem causing the overload or overheating 5 POWER INDICATOR This green LED will light when the power is switched on V THE BACK PANEL Model D 500A Power Rating 500 Watts RMS Supply Voltage 117V 60Hz PCA TVE PS OUTPUT IFAI 4 600 OHM TEL PAGE INPUT GAIN CONTROL This recessed control adjusts the level of the 600 ohm Tel 1 OUTPUT TERMINAL SCREW STRIP Four outputs are provided on this strip the voice 1 2 3 4 5 6 coil output for 4 ohm and 8 Page input S DIDID ohm speaker loads and the 2 D Q without effect 25V and 70 7V speaker line TELPAGE 600 OF TELPAGE soo OH TELPAGE 00 OF ing the level of C 40 80 25V 70V For No Gai For 1 2 Gai For Full Gal P i 1250 100 outputs Ocio
6. DES e ee ske Porcina USER S MANUAL D 500A POWER AMPLIFIER Product Description 2 Using Horn Speakers 5 Specifications 2 The Auto Mute Circuit 6 Unpacking Procedures 3 Maintenance 6 Product Overview 3 Warranty Service 6 Installation Information 3 Troubleshooting 7 The Front Panel A Accessories 7 The Back Panel A Schematic 8 Speaker Installation 5 090705124 NEW TECHNOLOGY gt OLD RELIABILITY Y DO Davis amp Company e 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 sales jwd com www jwd com WARNINGS WARNING TO REDUCE THE RISK OF FIRE WARNING THIS AMPLIFIER MUST BE AN OR ELECTRIC SHOCK DO NOT EXPOSE AN GROUNDED DO NOT REMOVE GROUND PIN THIS UNIT TO RAIN OR MOISTURE FROM AC PLUG OR USE A DEVICE TO CHANGE FROM A 3 PIN AC PLUG A CAUTION In the event the transformer s A CAUTION These deviced are not intended for thermal breaker does nto reset have the use in hazardous locations as defined by the trouble investigated by an authorized service National Electrical Vode NEC and by the technician or return unit to the factory National Fire Protection Association
7. NG THE AC CIRCUIT BREAKER If a the unit is overloaded or it overheats the AC line circuit breaker on the front panel will open Before resetting the circuit determine and correct the problem causing the overload of overheating see Troubleshooting on page 7 for a chart to help guide you in determining the cause of the problem If after exhausting the possibilities the circuit breaker will not reset have the unit serviced by a qualified technician NOTE If the unit is rack mounted you must utilize a cooling fan that is capable of exhausting not less than 300CFM REPLACING THE FUSES Additional protection is provided by fuses in the power supply which protect the transformer If an output is shorted the fuses will blow Before replacing the fuses determine and correct the problem causing the fuses to blow see Part X Troubleshooting on page 8 for a chart to help guide you in determining the cause of the problem To safely replace the fuses 1 Disconnect the AC power cord 2 Remove the top cover screws and cover 3 Replace blown fuses with same type and size 4 Reinstall the top cover securely 5 Reconnect the AC power cord X WARRANTY amp TECHNICAL SUPPORT For a period of five 5 years from the date of original purchase J W Davis amp Company warrants that it will correct any defects in material or workmanship in the D 500A without charge However this warranty does not apply to equipment which in the opinion of J W
8. OL A 2 l alee oe 3 Ej i Ly SD Sb NDE EZOSLPNI AooL anzz AV A q Ed e CH aney x0L y AV lt LI 1 yA l l ji an 10 EOS Lar Nees 2n pue Ln er LPN 904 yee 1 1 oo SN ecu i i ANIS LY3H sva 2 i 4 oz XOL 3n9s0 0 1 1 e S je an 10 0 a gnol 1ndino elo eit a ds Y anor 8 8 S dd 0004 x ua u i wA Sh lPNI SsvSdW q I 1 E 4 Woe i I AOS yy LSSSNZ LSSSNZ 1 tere tee 1 r gt 1 o 7 tsssnz UYO 022 0Vsdn E 3 su N N I ZJ a 24004 H ose ASS gt P A Z 5 NO LON E Y erin ez Q RFs 80d L o 1 i an 10 0 INdLNO NO ALAN BYE adzy 918 8 ZLY Z i oly za vo 3 E Wi 8 3nko o i aa MAA WA aaa 3 JEE 8v LYNI j 081 yot ZZ0S LPWIXE sersan ie a i gt Ly 10 i lt V Jno OS 2 zo ATT TZ zu l i 03703801 SJ ozz to LOW eos arn _ yo e te swai j l lu 1 Oy o T j OL 992d wa 90 l Ly o sd A00L 3nzz 1
9. a k coca the high imped Mp Bib Factory Preset ance input It is factory preset at 0 This input will mute the Hi Z inputs automatically To defeat this feature see Part VIII The Auto Mute Circuit on page 6 5 AC CONVENIENCE OUTLET Grounded outlet to run additional equipment 2 amp maximum 2 INPUT PATCH These are two high impedance inputs connect ed in parallel One is for signal input the other for bridging to a second amplifier that will allow increasing the power to the entire system 3 INPUT TERMINAL SCREW STRIP This strip is designed to accept either a 600 ohm bal anced input or a Tel Page balanced input These inputs differing only in sensitivity are designed for wide acceptance without the need for any accessories It is recommend ed to use ground reference on the input whenever and wherever possible 6 AC LINE CORD Three conductor line cord for AC supply voltage 4 NEW TECHNOLOGY OLD RELIABILITY Y DO Dauis amp Company e 3030 Canton Street PO Box 710219 Dallas Texas 75371 0219 Sales 800 527 5705 Fax 800 388 9106 Corp 214 651 7341 Fax 214 939 0328 sales jwd com www jwd com The D 500A is designed to be connected to 4 ohm or 8 ohm speakers directly or to variable impedance speakers that match the amplifier s line output voltage of 25V or 70 7V speaker lines VI SPEAKER INSTALLATION CONNECTING FOR DIRECT 4 or 8 OHM OPERATION Connect 4 ohm speaker s t
10. anced with VOX Mute Line Level 600 Ohm Balanced Input 0 50V Distortion at Rated Output lt 0 3 THD Weigh 2 NEW TECHNOLOGY 4 gt OLD RELIABILITY Y W Dauis amp Company e 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 sales jwd com www jwd com INSPECTION This unit was carefully checked and packed before leaving the factory However each shipment should be inspected by observing the shipping container and unit for indications of improper handling If damage has been found an immediate claim should be made to the shipping company Keep all cartons and packing material for inspection Do not call J W Davis amp Company or return the shipment to J W Davis amp Company until the shipment has been examined by the shipping company Failure to permit the shipping company to examine the shipment at the arrival point may void subsequent settlement If there is a problem after the shipping company has made its inspection then call Customer Service at J W Davis amp Company for assistance I UNPACKING PROCEDURES INITIAL PERFORMANCE CHECK Complete the inspection with an initial performance check Connect a test speaker to the 8 ohm direct output terminals Then connect a tuner tape deck or CD player to the auxiliary input and set the controls for operation If the unit should be inoperable and no damage is noted p
11. d 2 WIRE COPPER CABLE LENGTHS FOR SPEAKER LINES AT 0 5dB LOSS IN SPL 12 5 POWER LOSS IN WATTS 70 7V SPEAKER LINE AWG LOW IMPEDANCE FOR 25V LINE DIVIDE ALL 70 7V LENGTHS BY 8 SIZE SPEAKER LINE NOMINAL POWER IN LOAD 4 OHMS 8 OHMS 16 7 5W 15W 30W 60W 100W 125W 250W 400W 500W o 120 240 480 s00 250 7 500 110 550 365 275 150 300 6 200 3 100 1 550 940 750 375 230 185 a so o 10 7 600 3800 1900 950 600 aso 225 140 m0 16 30 6o 120 4800 2400 1 200 600 370 290 145 90 18 20 40 75 3000 1500 750 375 230 180 00 20 1 25 so 1920 960 480 240 150 to 2 1 1 30 1200 e so 150 s Vil USING HORN SPEAKERS ENABLING THE LOW CUT FILTER If horn speakers are being used the low cut filter must be activated to protect them To enable the low cut circuit follow these steps 1 On the same board as the VOX Mute look for a tagged jumper that reads To activate low cut filter cut this jumper 2 Cut the jumper and make sure the jumper halves do not touch any of the other part of the board The low cut filter begins to roll off frequencies at 120Hz NOTE For complete protection of compression drivers or horn diaphrams additional electronic equipment may be necessary 5 NEW TECHNOLOGY OLD RELIABILITY Y DO Dauis amp Company e 3030 Canton Stree
12. lease contact J W Davis amp Company s Customer Service Department for directions 800 527 5705 CAUTION TO PROTECT THE SPEAKER FROM DAMAGE DO NOT TURN THE UNIT ON UNTIL ALL CONNECTIONS HAVE BEEN MADE IN ADDITION BE SURE THAT THE UNIT IS GROUNDED BEFORE TESTING ll PRODUCT OVERVIEW Tel Page Microphone Input Music Input Source Two Aux Inputs Strapped in Parallel cl Amplification 600W Patch Feature Inputs For Additional Amplifier D 500A POWER AMPLIFIER lll INSTALLATION INFORMATION RACK MOUNTING For best results use a 10 32 class UNF 2B or 12 24 class UNC 2B rack and 0 625 inch machine screws metric M5X8 6H or M6X1 6H 15 88mm It is recommended that the drive of these screws be phillips to protect the finish from unnecessary scratches Nylon or plastic washers are recommended which will not only help protect the finish but also aid in retaining the screws CONVECTION FAN COOLING AND VENTILATION This unit is cooled via convection and therefore designed for continuous operation Do not block the unit s heatsink fins or the vent holes located in the cover If the unit will be rack mounted a cooling fan must be used that is capable of exhausting not less than 300CFM The fan must be mounted to the inside top of the rack above the amplifier 3 NEW TECHNOLOGY OLD RELIABILITY Y DO Dauis amp Company e 3030 Canton Street PO Box 710219 Dallas Texas 75371 0219 Sales 800 52
13. level too high e Lower the signal in level No input signal source e Verify that proper signal level is being supplied Incorrect input signal connection Verify that the signal input connection is correctly connected Incorrect output connections e Check that the ouput connection has been properly made 600 ohm Tel Page gain control Check 600 ohm Tel Page gain control setting recessed on on back panel too low back Internal jumper setting e Check that the internal muite jumper is not disabled See page 7 Insufficient 600 ohm Tel Page e Check 600 ohm Tel Page gain control setting recessed on gain back Volume setting e Check the corresponding gain control on the front panel or the 600ohm Tel Page control recessed on the back Signal input level is too low e Check that adequate input signal level is strong enough Signal input level is too high e Reduce input signal accordingly Input or output impedance not e Check that the proper input output line impedance matches matched the selected input output connections used Possible low resistance or e Check correct system wiring shorted wiring across the audio in and or across the speaker out XII OPTIONAL ACCESSORIES e Optional 600 ohm Isolation Transformer IT 600 e Speaker Lightening Suppressor SLS e Tel Page Line lightning Suppressor TLS e Universal ADD ON AMP AO 1A used to match 4 or 8 ohm 25V and 70V speaker line to MIC or Auxiliary input of amplifier e
14. o terminals 1 and 2 or 8 ohm speaker s to 1 and 3 For proper signal phasing observe polarity NOTE This is a bridged output Do not ground either of these terminals CONNECTING FOR 25V or 70 7V LINE OPERATION For 25V output connect the load to terminals 1 and 4 For 70 7V output connect the load to terminals 1 and 5 NOTE When using the amp s 25V or 70 7V line operation the proper tap setting of the impedance matching transformer determines the individual speaker s power level Using 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 The sum of all connected speakers power settings must not exceed 80 of the total power available from the amplifier USING THE PROPER WIRE SIZE AND LENGTH Cable distance should be kept as short as possible to minimize power loss The chart below can be used as a general guide showing various wire sizes and the maximum distance related to cable loading that speakers can be placed from the unit for an approximate 0 5dB loss 12 5 power To allow for future expansion and distributed cable line loss it is recommended the total system wattage should not exceed 80 of the amplifier s rated output To determine the total system wattage sum the wattage tap of all speaker s horn s use
15. t P O Box 710219 Dallas Texas 75371 0219 Sales 800 527 5705 Fax 800 388 9106 Corp 214 651 7341 Fax 214 939 0328 sales jwd com www jwd com Vill THE AUTO MUTE CIRCUIT DISABLING OR ENABLING THE AUTO MUTE CIRCUIT The JWD series of mixer amplifiers include a built in automatic mute circuit The MIC The Auto Mute Circuit TEL PAGE 600 ohm input channel can automatically mute the AUX channel This unit is Connect shunt here to factory installed to auto mute however the mute is defeatable by moving the internal Wa EAA ANE mute jumper to its other position To defeat the auto mute circuit follow these steps 1 Unplug the A C cord 2 Remove the hood and find the input board located on the back panel 3 On the board locate the header X2 See the figure to the right Change the shunt position from positions 1 and 2 Connect shunt here to to 2 and 3 and the auto mute will be defeated enable the Auto Mute Factory Pres et IX MAINTENANCE The D 500A is built to last and therefore comes equipped with multiple built in protections including relay short circuit and AC circuit breaker If the unit is overloaded e g too many speakers shorted speaker line mismatched line impedance e g 8 ohm speaker on 70 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 output failure RESETTI
Download Pdf Manuals
Related Search