Crown DC-300A Page 39 Instruction Manual Download | Manualshive

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Summary of Contents for DC-300A

Page 1: ...w crolun INSTRUCTION MANUAL SERIAL NO ISSUED DC 300A DUAL CHANNEL LABORATORY AMPLIFIER DC 300A IM 9 S3P2 15 6 CROWN INTERNATIONAL INC BOX 1000 ELKHART INDIANA 46514...

Page 2: ...er channel both channels operating 0 1 total harmonic distortion 3 4 ohm test 4 Protection tests 5 Reliability test 6 20KHz 155 watts per channel minimum RMS both channels operating into 8 ohm 0 05 to...

Page 3: ...ing purity and stability 4 5 6 7 8 9 10 11 Protection Test This is a test with a 2 ohm load which determines the threshold at which the protection circuitry will be activated Sharp clipping should occ...

Page 4: ...Precautions 21 3 4 Load Protection Methods 21 3 5 Cleaning 22 Section 4 CIRCUITRY 4 1 Principles of Operation 23 4 2 Test Procedures 24 4 3 Service 24 Section 5 APPLICATION NOTES Application Note No...

Page 5: ...hematic For Full Range Electrostatic Speaker Connections 15 Schematic of Earphone Pad 16 DC 3ODA Mono Hook up 16 Table For Selection of Input DC Blocking Capacitor 17 Low Pass Filter For Severe RF At...

Page 6: ...supply See Section 3 2 for a description of the protective systems The power supply features a 1 KW transformer and large computer grade filter capacitors giving over 48 joules of energy storage A to...

Page 7: ...er channel both channels operating 0 1 total harmonic distortion Less than 0 001 from 20Hz 400Hz and increasing linearly to 0 05 at 20KHzat 155watts RMS per channel into 8 ohms Less than 0 05 from 0 0...

Page 8: ...at 1 watt into 16 ohms 1 dB DC 6OKHz at 1 watt into 16 ohms 360 watts RMS into 16 ohms Less than 0 001 from 20Hz 400Hz and increasing linearly to 0 05 at 20KHz at 310 watts into 16 ohms Less than 0 05...

Page 9: ...gnal diodes 3 zeners and 6 rectifier diodes 1 kilowatt transformer with massive computer grade filter capacitors storing over 48 joules of energy Two regulated supplies for complete isolation and stab...

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Page 13: ...10 TO DC 10 100 1K 10K 1OOK FREQUENCY Hz 60 10 100 1KHz 1OKHz 1OOKHz FREQUENCY Hz...

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Page 16: ...ue to the built in thermal pro tection Such a condition if observed will also be ac companied by a warm front panel due to the integral heat sinking employed in the amplifier Applications requiring lo...

Page 17: ...wise to remove power from the unit and turn the input level controls off while making connections Before making connections it is recommended that the operator familiarize himself with the amplifier...

Page 18: ...aced in series with the load For electrostatic speakers if the manufacturer has not provided a capacitor an external non polar capacitor of 590 708 mfd and 4 ohm power resistor should be placed in ser...

Page 19: ...as follows 1 The input line should be plugged into the channel 1 input jack The level is adjusted with the channel 1 input level control NOTE The Channel 2 input jack and level control are not defeat...

Page 20: ...ds of input equipment resulting in a system oscillation To combat the problem first try reversing the speaker leads on all channels if possible If this does not solve the problem try grounding the pow...

Page 21: ...tions see Fig 2 10 ALL VIEWS WITH BOTTOM PLATE REMOVED 1oov 120v See Note 2oov 220 v 2 4 0 V See Note I I I I L I 1 I NOTE The 120V and 240V connections require the changeover of the RED wire from TB...

Page 22: ...S M S The DC 300A is protected against all the common hazards which plague highpower amplifiers including shorted open and mismatched loads overloaded power supplies excessive temperature chain destru...

Page 23: ...A uses eight 150W silicon power transistors per channel chosen for their combination of current voltage and response characteristics to allow wide operating safety margins The safe operating area of e...

Page 24: ...l symptoms are no indication of AC power by the pilot and a warm front panel All of the amplifier s voltage amplifier circuitry is de signed to be inherently current limited Thereby if any of the devi...

Page 25: ...sources Fig 3 5 shows the schematic of a muter which when inserted in the input signal line mutes for several seconds before connecting the source to the amplifier thereby eliminating turn on transie...

Page 26: ...tage is a quasi complementary format em ploying the CROWN class AB 8 technique which uses no bias current in the output transistors The result is maximum efficiency with minimum crossover notch dis to...

Page 27: ...ttage is critical For example a 2 voltage error together with a 1 resistance error can result in an error of lOwatts power into 8 ohms 8 9 10 11 Residual distortion and noise levels should be fully kn...

Page 28: ...latively stable load may be resonantly tuned to present a real value of im pedance to the amplifier Any load no matter how complex its behavior has a V l operating range which may be mapped by the fol...

Page 29: ...of the DC 300A the VFX 2 can serve asthe interface While maintaining these functions the output can be shaped by selecting variable high pass lo pass or band pass filters As a filter the VFX 2 can be...

Page 30: ...ucts for any faults occuring externally to the amplifier outputs such as speaker short circuits open circuits etc In order to fairly share the responsibility and since the protection cannot be exhaust...

Page 31: ...PARTS LIST DC 300A Page 1 Schematic Designation ClOO...

Page 32: ...0 3620 820 ohm l 4 watt 10 3301 82 ohm l s watt 10 3300 470 ohm VI watt 10 2626 120 ohm V Z watt 5 Film 3837 15K ohm Y z watt 10 1064 3 3K ohm 1 watt 5 3617 15 ohm l 4 watt 10 2 2K ohm X watt 5 Film 7...

Page 33: ...N270 1 N4003 lN9616 1OV zener Integrated Circuits A739 or A749 Coils 5 mhy axial lead Miscellaneous Main PC board TO 5 mounting pad TO 5 coolers IC socket 14 pin DIL TO 92 dual cooler PC receptacle 8...

Page 34: ...isc 22 MF 1OOV Filmatic Diodes 1 N4003 Resistors 180 ohm l 4 watt 10 5 6 ohm 1 watt 5 or 12 ohm 2 watt 1 33 ohm 5 watt 5 Wire Crown Part Other Information 3636 Used to mount coil assy 3609 One used on...

Page 35: ...panel extrusion Front panel overlay Knobs Xi bright nut Bright washer Carrier strip 25K ohm audio ZF3448 Rack ears SHIELD ASSY Main board shield Brass shield spacer 8 32 x THP screw Crown Part 3937 39...

Page 36: ...4 To mount power switch 3503 Mounted on shield 2134CAD To mount terminal strip 1889 To mount terminal strip 3600 Under terminal strip 1823 To mount terminal strip 2544 Mounted on shield in square hole...

Page 37: ...seholder Fuse block 1 OA 3 AB fuse 5A ABC fuse Strain relief 112A 2 conductor hi D jax 3 8 fiber shoulder washer Fiber flat washer Dual binding post 6 solder lug 505 250 faston terminal 250 faston ter...

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