Crown Macro-Tech MA-5000VZ Manuel du propriétaire Page 1

NotesMACRO-TECH 5000VZOVERVIEWAt first glance the MA-5000VZ looks a great deal Hke any other MASeries amplifier, except that ¡t is physically larger a

Notesmode, except that ¡n the event ODEP ¡s activated to protect theamplifier, the VZ will automatically lock into low voltage (high current)mode. Whi

VZ SUPPLY CIRCUITRYFor simplicity, only channel 1 circuitry will be covered unless notedotherwise. Circuitry.forthe VZ supply (and lowvoltage supply)

Noteslevel has dropped sufficiently. Capacitors ¡n the U705 circuitry controlthe speed of the down-shift. In the Bi-ODEP mode, the switch opéralesas i

Noteslevel has dropped sufficiently. Capacitors in the U705 circuitry controlthe speed of the down-shift. In the Bi-ODEP mode, the switch opéralesas i

NotesAlso tapping in to the ODER output control of LS bias feed and VoltageTranslator feed are signáis from the fault, power (turn-on delay), andpower

condition based on the power being delívered for the existing heat level.The ODER amplifier accepts íhis input informaíion and, using an RCmodei of th

NotesAIso tapping in to the ODER output control of LS bias feed and VolíageTranslator feed are signáis from the fault, power (turn-on delay), andpower

wíth the power signal, drives the ODER amplifier U112A. The RCnetwork in the feedback path of U112A models the thermal junctionsfrom output devíce die

FRONT END THEORYThefront-end portion of the over-all block diagram has been exploded in the diagram below. Once again, only channel1 will be discussed

Input to the amplifíer ¡s oníy vía P.l.P. module. The standard moduleshipped with the MA-5000VZ is the P.I.P.-FXQ. Whether this or anyother module is

NotesThe two channels may be used together to double the voltage (bridged-mono)orthecurrent(parallel-mono)presentedto the load. Thisfeaturegives the U

NotesError AmpThe Error Amp (U 105) input comes from the Variable Gain Stage withor wiíhout Loudspeaker Offset Integration (LOI), and is summed witham

Inverting StagesOverall the amplifier is non-inverting. Four stages within the amplifier,however, do invert the audio signal for a net norHnversion. T

NotesNote: Any protection sign$Uviíhin the amplifier which is t¡a^<á to shut itdown will discria.rg^t'his capacitor (C1 20) immediately causin

C120CHARGEVOLTAGEO 1PULSEODC FROMLVPS,¿11*11 III miAMAHAM A HA II AltH11 lili 1U Hl UI!1lilil1i'**iO 1SOFT-STARTTRIACCONTROL6 is ampfcfter shutdo

NotesLSNPN CURREN!HSNPNCURRENTOUTPUTMODULE-±r REDOWTSW 1 OVER-VOLTAGEOverall protection scheme block diagram.DC/LFIThe amplif ier senses it own output

+ 15VR324D1 TIMER/STSY1+ 15V+ 15VR7713.3*0CHANNEL 2O VER-VOLT/THERM-vrU707CLM339NotesOver-Voltage and Thermal Switch¡nformation combines to produce th

-15VNotesDC/LFCircuitry| labNSbE10OJA» REDR338^47 KCH1DC/LFR1593.3K-15VR33914.3KU109CLM339111OC183I C18Si22 x01¡_ 14Q19> 13D102laMUTE1 ^> R327 &

Common Mode Output CurrentCommon mode current ¡n the output stage can only be due to an outputstage faílure, or full power output of RF energy. Common

NotesFan ControlThe MA-5000VZ, unlike other members of the Macro-Tech family, hastwo on board fans. They are mounted to the chassis dívider assemblyan

U707BLM339NotesDISPLAYAmplifierfront panel indication includes a total of 7 LED's. These includeEnable, ODER, SPI/IOC, and ILOAD/ILIMIT.The Enabl

improved thermal performance by eliminating the insulating interfaceunderneath the power devices. The chassis itself is used as part of thethermal cir

NotesMA-5000VZ Front PanelDisplay CircuitryILOAD/ILIMIT LED's flash green with the audio when program material isbeing deüvered to a load. Its fu

NotesQ507, Q508, and Q509 are the -LVA's and are arranged ¡n mirror imageto the +LVA's, ¡ncluding D513.On the positive side D514, D515, and

D506 is theflybackdiode forthe HS NPN output quadrant. In the eventthat a back EMF (flyback) pulse exceeds power supply voltage, theflyback diode will

-I-VCC1oI-15VI-15VC5242OOpFR5521OOR5531OOTo NPN LSPredriverD518D5JD4yHIC5210pD521NdRS565004 1LOW SBIAS6=f>>[55— <DEA^ D5£r os:R5541 .821&apos

to the output stages. For the HS, this limiting ¡s accomplished on themain module and isexplained ¡nsect¡on4.4. Forthe LS, ODEP provides(via wires lab

NotesReducing the voltage reduces the heat. Since the amplifier runs cooler,you can safely pack more power into the chassis.The VZ supply is divided ¡

to switch VZ modes. The switching circuitry is designed to preventaudible switching distortion to yield the highest dynamic transferfunction—you hear