Photogenic Flashmaster AA06 User manual

Photogenic


                 MODEL l\406

            OperatorlsManual
            and PartsList





     $
 Designefs ol Fine Lighttng@Equlpnent  Sinc,€ 1921
THE PHOTOGENICMACHINECO.
   PO. Bo( 3365 . YoungstownOH 445'12
Phone (216)758€658 r Tdl Free 8@682-7668

PART  I

SECTION 1. SYNCHRONIZATION
   An electronicspeedlightflasheswithin a few millionthsof a
secondafterit is triggered.The camerashuttershouldbe equipped
with contactsof the zero delay type for use with speedlight.
    Synchronizationis extremelyimportantand the greatestcare
should be taken in making all connectionsto the synchronizer
cables. lf these connections are not made in a careful and
workmanlikemanner,eitheran intermittentconnectionor an elec-
trical leak betweenthe two leads may result. Either will cause
unreliable performance.An electrical leak will be especially
noticeableduring humid weather.
    After the synchronizercable is properlyconnected,it is well
to checkthe synchronizationwith the camera.Adjustthe lighting
unit to the same heightas the cameralensand face the lightinto
the lens. The lens apertureshould be throughthe back of the
camerato operatethe shutter.The flash of the light shouldthen
appearas a circlethe same size as the aperture.A few sheetsof
white paper in front of the lens will cut down the brillianceof the
flash and aid in makingthe observation.lt is best to performthis
test with the modelinglamp turnedoff. lf the circle is flattenedon
the sides,or if no light appearsthroughthe lens,the shutteris not
synchronizedwith the light.Shuttercontactsfor this light should
be X- or zero-delaytype. lf the light appears not to be synchron-
ized,the shuttercontactsshouldbe checkedby a reputablecamera
repairman.
SECTION2. SAFETYPRECAUTIONS
   Despitetheextrememeasuresthathavebeentakento make
this equipmentfoolproof,it must be recognizedthat high voltages
do exist within the power supply, cables, and lighting units.
Therefore,certainprecautionsmust be observedin handlingthe
equipment.
   Do not attemptto changeflashtubesor modelinglampsunless
the unit has been dischargedand the lightingunit disconnected
from the power supply.

Alwaysmakecertainthatthe powersupplyis disconnectedfrom
the 11S-voltA,C. linebeforeattemptingto serviceit.
   Do notopenthe powersupplycaseor disassembleanyof the
equipmentunlessyou are familiarwithequipmentof thistype.
             DO'S AND DON'TS
  DO-Turn PowerSupplyUnit "OFF" whennot in use.
  DO-Avoid quickrepeatedflashing.Damagemay result.
       The full chargingtime shouldbe allowedbetween
        flashes.
  DON'T-Permita lightingunit cableto becomefrayedor
        loosein a connector.
  DON'T-lnsertor Removea Flashtubeunlessthe Power
       SupplyUnitis fullydischarged.
  DON'T-Removethetopcoverfromthe PowerSupplyUnit
        or placea handnearany partinsidethe unituntil
       you are certainthat the capacitorbank is fully
       discharged.
  DON'T-lnserta screwdriveror othermetalobjectintothe
        flashtubesocketor any electricoutlet,socketor
        receptacle.Contactwith highvoltagemay result.
  DON'T-Attemptto makerepairsto the speedlightoutfitif
       youarenotfamiliarwithelectronicequipment.Your
        dealershouldbe consultedregardingan authorized
        electronicor radioserviceman.
  DON'T-Plugthe unit intoany serviceexcept100-125 V.
        60-cycleA.C.lf thisunitis pluggedintoD.C.service,
              it may resultin seriousdamageto the component
         parts.
                PART II
       THE PHOTOGENICFLASHMASTER
              SPEEDLIGHTS
SECTION1. GENERAL
   ThismanualcoversFlashmasterSpeedlightingoutfitshaving
catalognumbers:
   AA06powerpackand 8050-M,8050-UMB,AA11, AA12, and
AA17lightingunits.



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The PhotogenicFlashmasteris a portable,multiple-light
 speedlightoutfit.lt is designedfor continuousheavy-dutyservice,
 andincorporatesmanyspecialfeatureswhichmakeit ideallysuited
 for schoolphotography,SantaClausphotographyandotherhigh
 productionwork.

    The powerpack is voltageregulatedto providethe constant
 lightoutputwhichis so necessaryfor qualitycolorphotography,
 especiallywherethe film is processedautomatically.

    Two,three,andfourlightoutfits,using6",11",16'orumbrella
 lightingunitsareavailable.Eachpowerpackwillaccommodateup
 to five lightingunits.

    The powerpackfeaturesvoltageregulation,a misfirealarm,
 a veryrapidrecharge,andcomponentsratedfor continuousheavy
 service.All powerpacksarebuiltaroundthe "DO-IT-YOURSELF"
. repairconceptwhichis exclusivewithPhotogenicin thespeedlight
 field.Theelectroniccomponentsaremountedso theycanbe quickly
 replacedby anyonewithoutuse of a solderingiron.

 SECTION2. UNPACKINGAND SETUP
    Unpackall unitscarefullyto makecertainthat all partsare
 removedfrom the cartons.Do not discardor destroypacking
 materialuntiltheequipmenthasbeenassembledandall partsare
 accountedfor.

     Afterunpacking,all partsshouldbe examinedfor anydamage
 whichmayhavebeencausedby roughhandlingduringshipment.
 IF ANY DAMAGEIS DETECTED,CONTACTTHE DELIVERY
 CARRIERAT ONCE.CLAIMFORDAMAGESHOULDBE MADE
 TO THEDELIVERYCARRIERBEFOREDESTROYINGPACKING
 CASES.

    The 6" and umbrellalightingunitsare shippedcompletely
 assembledandreadyto operate.lt is onlynecessaryto set up the
 standsand fastenthe lightingunitsto them.The 11" and 16"

lightingunitsare shippedwith the lamps packedseparately.After
unpacking,installthe flashtubesand modelinglamps.

A.   Initial Operation
    Plug in four llghtingunitsand connectthe line cord from the
power pack to a wall outlet.Turn the power switch ON.

   As soon as the switchis turnedon, the red indicatorwill light.
At the sametime,the whitechargeindicatorwill comeon indicating
that the powerpack is charging.In threeseconds,whenthe power
pack reachesfull charge,the white chargeindicatorlightwill go
out.This indicatesthat the powerpack is fullychargedand is ready
to flash. Plug the trip cord into the power pack and trigger it by
touchingthe ends of the wires together.The lightswill flash.

   As soonas the lightsflash,the chargeindicatorlightwill come
on again and will go out after the power pack is fully charged.

   When the switchis turnedoff, the powercapacitorswill be com-
pletelydischargedby the dischargerelay insidethe power pack.


SECTION3. USEOF THE LIGHTS

A. Power Supply
1. ProgramPlugs-ModelAA06 PowerPack
   ThemodelA406powerpackhasa totaloutputpowerof 600
watt/seconds.Manydifferentcombinationsof outputpowerare
availableby using differentpower plugs.

   The poweroutputindicatedon the plug is obtainedwhen the
plug is inserted.See figure#1. This selectoris not a turn type switch,
but rathera plugwhich must be physicallyremovedand re-inserted.
Power changesshould not be made withoutfirst turning off the
power switch,which will dischargethe power capacitors.




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2.  Misfire Alarm
   When usingthe No. 5 powerplug, the MisfireAlarmwill
operate.All fourof the MisfireAlarmswitchesshouldbe setto the
"oN" position.lf anyof thefourlightsshouldfailto flash, abuzzer
willsound,warningtheoperatorto retaketheexposure.TheMisfire
Buzzercan be testedmerelyby unpluggingany lightingunitand
flashingthe lights.

       lf fewerthanfourlightsareto be used,turnthe MisfireAlarm
switchnextto the unusedoutlets.(Theseswitchesalsoturnoff an
unwantedlightingunitwithoutunpluggingit.)
   When using the No. I powerplug, the MisfireAlarm is
inoperative.lf severallightingunitsare used,the buzzerwill NoT
soundif one lightingunitfailsto flash.

3.  Protection
   A circuitbreakeris providedto protectthe equipmentfrom
damageby a shortcircuit.

4.  Flashing Rate
    This powerpackwill not be damagedregardlessof how rap-
idlyit is flashed.However,if it is flashedbeforethe indicatorlight
hasgoneout,the powerpackhasnot reachedfullcharge,andfull
lightoutputwill not be obtained.In addition,continuousrapid
flashingcan overheatand damagethe flashtubes.

5.  Triggering
   The powersupplycan be triggereddirectly,by meansof the
trip cordprovided,or it can be triggeredremotelyfromthe flash
of anotherspeedlightby removingthetripcord.Whenthetripcord
is notinsertedintothe syncjack,the built-inphotoslavecircuitwill
operate.To turnthe photoslaveoff, insertthe trip cordbackinto
the syncjack.

6.  Charge Indicator Light
   Thechargeindicatorlightcomeson wheneverthepowerpack
is chargingand goesout againwhenthe pack is charged.



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Undernormalconditions,the rechargetime is threeseconds
if the full outputpoweris used;less if only part of the poweris be-
ing used.
    This is a voltageregulatedpowerpack.When comparingthe
ratedchargingtime on regulatedpack,bearin mindthe difference
in the way the chargetime ratingis determined.lt is customaryto
ratean ordinaryspeedlightpowerpack by the tinnerequiredto reach
only 990/oof full charge.To reach 95o/oof full charge, 11/ztimes
the ratedchargingtime is allowed.To reach98o/o,twice ratedtime
must be allowed.A voltageregulatedpowerpack,such as the model
4406, however,will reach 100o/oFULL CHARGE in the rated
chargingtime. No extra allowanceis needed.
1,  6" Lights
   The unit is designedprincipallyfor use as an auxiliarylight.
The smallerreflectorlendsitselfwell to use as a backgroundlight
or an accentlight.Snootsmay be attachedfor greatercontroland
for spotlighteffects.Simplypushthe snootintothe reflectorso that
the springssnap over the reflectorbead and hold it in place.


  AA12
  Lighting                                                            Quick-
  Unit                                                        Change
                                                                       Reflectors




                                                                        AA12-24"


                                                    AA12-20"





                             AA12-16"

     AA12-11"
                    AA12-14"

                                                          8050M4

                                          AA11

                          7

The flashtubeis permanentlymountedin the reflector.lt is
recommendedthatthe lightingunitbe returnedto the factoryif it
 shouldeverbe necessaryto replacethe flashtube,sincegreatcare
 mustbe takento preventcrackingit duringinstallation.
   The flashtubeusedin theselightingunitsis designedto use
no morethan 400 watts/secondof power.
   The modelinglampis a No. 1079automotivelamp,whichis
availableat mostservicestations.Whenit becomesnecessaryto
replacethislamp,removelensby pressingon the springclipand
removingthe lens. lf a brightermodelinglamp is required,a
No. 1295lampmay be substitutedin placeof the 1079.
2.  11" Lights
       lf a largereflectoris desired,theAA11 andAA12lightingunits
are available.The AA11 is a wideanglelightusinga flat 111/z',
diameterreflector.lt providesa softer,broader,floodof illumina-
,tion,particularlyusefulfor photographyof groups,or for school
photography,whentheoperatordoesnotwishto repositionhislights
frequently.TheAA11 lightingunitusesa1or3 modelinglamp,and
an H4-1plug-inflashtube.lt willoperateat 400watts/second.Barn-
doorsand diffusersare availablefor this lightif desired.
3.  16" Lights
   The AA12-16lightingunit usesa 16" diameterstudiotype
reffectorfor the finestlightingcontrol.Theflashtubesocketis ad-
justableto providetwo differentlightpatterns.To adjust,loosen
the knobon the sideof the sockethousing,pushthe knobas far
as it will go in the directionof the arrow,then tightenit again.
    In the FLooD position,the reflectorhas a coverageof 60
degreesand hasno hotspotin the center.ThispatterniJbestfor
floodlightingof groups.
    In the MODELINGposition,the reflectorhasa coverageof 45
degreeswitha suitablehotspotin the centerso thatthe lightcan
be featheredto obtaincorrectgradationbetweenhighlightand
shadow.




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Best resultsare obtainedby usingthese lightsbetween36
inchesand42 inchesfromthe subject,for headandshoulderwork.
Byfeatheringthe mainsourcelight,it thenwillbe possibleto shade
the ear,etc.,of the subject.The fill lightmayalsobe featheredin
orderto obtainthe propershadowilluminationto balancewiththe
main source.lt is essentialto featherall lights away from the
backgroundso thatunwantedilluminationandshadowswill notfall
in this area.
    Barndoorsmaybe usedto increasethe etfectivenessof feather-
ing the light.lt attachesto the front of the reflectorand may be
rotatedas requires.The barndooris equippedwith a removable
mattefinishacetatediffuser.
   The sockethousingof the AA12lightingunit is fittedwith a
quick-changemechanismwhichpermitsthe reflectorto be attached
or detachedin seconds.The reflectorsnestfor easycarrying,and
protectivecover(Cat.No. A 47)is availableto preventflashtube
breakage.
   TheAA12usesa 1073modelinglampand H4-1flashtube.lt
will operateup to 400 watts/second.
   For backgroundlightingor specialeffects,this unit will also
accommodatethe small reflectorused with the Photogenic
Studiomasterbackgroundlight. lf orderedwith these reflectors
insteadof the 16" reflector,the catalognumberis AA13.





                                             A10157

The M17 lightingunit hasa 250-wattquartzmodelinglamp
with a variabledimmercontrol.The modelinglamp is correctly
designedfor placementin the centerof the plug-inflashtubefor
a time visualmodelinglampversusflasheffect.Plug-inlong life
flashtube/reflectorassembly.Rigid tilting yoke holds standard
umbrellaincludingPhotogenic'sS4-inch,45-inch,or 28-inch.The
umbrellabracketis adjustable.The8050-UMBis a smallerlightwith
a 1SO-wattquartzmodelinglamp.The flashtubeis permanently
mounted.The umbrellabracketis presetfor optimumfocusand
 is non-adjustable.

SECTION4. TECHNICALCHARACTERISTICS



         UmbrellaOutfit         Lightlng Unlt Sockets

                                                                     Power
                                                                                   Ratlo
                                                                       Program
                                                                                Input


Alarm                                                                               Indlvldual
Swltch                                                                           Outlet
                                                                          Swltches

Garrying
Handle

Photo
Slave

Sync                                               AC Power
Outlet                                                                 Input


  Pushto T         Modellng Llght   Flash Power  Gircuit   Power Indicator
  Charge Indlcator   Swltch (onoff)     (half and full)  Breaker   Light





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PowerSupply EngineeringSpecifications
Flash Power            .600 watt/secondmaximum.
Flash Duration               . . .1/1000secondto 1/250second.
RecyclingTime                  . .3 secondsto 10Oa/0,2.5secondsto
                        90o/owith 11S-volt,60HZline voltage.
Power Distribution.         . . .8 program ratio plugs provide 82
                      powerlevelcombinationsto 5 outlets.
                          Full and half-power switch is
                        standard.
ModelingLight Power        . Replaceablelow voltage1073 lamp,
                         standardwith portraitreflectors.330/o
                           brighter1295is optional.11S-volt,150
                  ESP lamp with 8050-UMBumbrella
                               light. 1 1S-volt,250-watt EHT lamp
                          with AA17 umbrella light. Approx-
                         imately1O-ampmain powerrequired
                          with 4-1295modelinglamps.
Triggering. . .          Low voltageSCR with built-inphoto
                               cell. Instantaneousby meansof trip
                         cord connectedto camerasync. Push
                             to test switch on panel.
Main Supply                       . 105,125VAC, 60 HZ 10-amppower.
Consumption               . . . .11/zamps idling. Eight amps max-
                     imum, recharging.
Voltage Stabilization        . . Rugged ferro-resonantstatic mag-
                         netic regulation.490 + SVDC
                         regulatedfor constantrepeatablelight
                          output.
Duty Cycle                         . . Gontinuous1 flash every6 seconds.

Synchronization
                        nected to camera sync with zero
                          delay.

                       11

j
     LightOutput                     . 12,800BCPSat 600 watts/second,
                          usingan 8050-MAlightingunit 6"
                                eflector.GuideNo.260forASA100.
     ColorTemperature     Balancedfor daylightfilm approx-
                            imately6000Kelvin.
,    OverloadProtection.         . . Ruggedcircuit breaker.
     Packaging                         . . Heavy-dutyvinyl-coatedcase.
r+
     InternalConstruction       . . Heavy-duty long  life transformer
                 ii::"l?,T;"fl::L::;::fl,'""#:::                          10Oo/ofactory-testedand calibrated. $ #
    Safety                            . . Automaticsafety dischargecircuit s
                      when power is removed.Safety
                          dischargewhen changingprogram
                            plugs.Circuitbreakerprotection.
    Weight                             . 15 lbs., 12 oz.
    Dimensions
   FLASHTUBES
     8050-M
       LightingUnit -  Type C4-1;permanentlymounted,maximum
      power400 watts/second,1073modelinglamps.
       AAll, AA12 and AA13
       LightingUnits- TypeH4-1plug-intype:maximumpower600
      watts/second.

      watts/second,ESP modelinglamp.
     AA17
       LightingUnits- TypeC4-2plug-intype:maximumpower600
      watts/second,EHT modelinglamp.
      Modelinglamps:No.1073,all lightsexceptAA17.1295maybe
      substitutedfor 1073if brightermodelinglampis desired.
      AA17:250-watt(ENT)quarlzhalogen.8050UMB:1S0-watt(ESP)
       quartzhalogen.

                         12

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*
    SECTION6. SERVICE
     A.  Safety Precautions
        Everyefforthasbeenmadein the designand manufactureof
      this equipmentto makeit completelysafein operationor during
      servicing.In addition,a safetydischargerelaycompletelydischarges
     the powercapacitorswheneverthe equipmentis turnedoff.t       cAUTloN:Thisequipmentusesvoltageswhichcancauseun-
     comfortableand dangerousshock.In sp-iteof the abovesafety
     features,ALWAYSBE CAREFUL.We recommend:
      1. Firstturnoff powerswitchandthendisconnectlinecordbefore
       changingmodelinglampsor openingpowersupplycover.
      2. Neverinserta screwdriveror any othermetalobjectintoany
        outlet,socket,or receptacle.

      3. Do not attemptto operatethe equipmentwith caseremoved,
       unlessyou are familiarwith electronicequipmentand the
       hazardsinvolved

     B.  Power Supply
       To openthe'case,slidethe two Flashmastertrimstripsout of
     the trim plateson eachside.Removethe threescrews.

    C.  Lighting Units
        For informationon replacementof modelinglamps and
     flashtubes,see Section3.nn     D.  General Service Instructions
          In orderthatyou mayexpectlongandtrouble-freeserviceevery
    precautionhasbeentakenin the designand manufactureof this
    equipment.Frequentservicingis not likely to be necessary;
    however,the suggestionsofferedherewillassistthe photographer
      in recognizingthe causeof anytroublewhichmayarise,andwill
     aid him in havingit correctedas quickryand as inexpensivelyas
     possible.



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Whentroublearises,try the followingsimplethingsfirst:
1. Resetbreaker.
2. Try a new flashtube.
3. Try anotherline cord.
4.  lf the unitis nottriggeringproperly,makesurethecamerashutter
   or trip cord is not at fault.
5. Try to determinewhetherthe troubleis in the lightingunitsor
   the powersupply.

   Disconnectthemandtrythesuspectedlightingunitwitha good
powersupplyandthesuspectedpowersupplywitha goodlighting
unitif available

   A wordaboutintermittentdefects:oftenequipmentwillnotbe
completelyinoperative,but will operatesatisfactorilypart-time.lf
the equipmenthappensto be operatingsatisfactorilyat the time
a testis beingmade,the testwill not findthe defectbecausethe
intermittentdefect is sometimesvery difficultto locate. In
troublesomecases,be verysystematic,keepinga recordof each
steptakenand notingthat the resultsare consistent.Careand
patiencewill usuallyuncoverthe trouble.

E. Common Symptoms and Their Causes
1. LIGHTFLASHESBY ITSELFWITHOUTAPPARENTREASON.
  Probablecause:
       (1) Defectivetrip cord,or trip cord incorrectlypolarized.
       (2) Brightlightfallingon photoslave.
       (3) Defectivepowercapacitor.
       (4) Poorconnectionin line cord
       (5) Reversepolarityon trip cord connectionat camera.

2. TRIPCORDWILLNOT FLASH,BUT CHARGEINDICATOR
  SHOWSTHATTHE PACKHASCHARGED.
  Probablecause.'
       (1) DefectivetriggerSCR.
       (2) Defectivetrip cord.
       (3) Defectivelightingunit.
       (4) Defectivetriggercapacitor.

                     15

3. ONE LIGHTWILL NOT FLASH.
   Probable cause.'
        (1) Try the non-flashinglightingunitin the otheroutlets.
                  lf it does not flash, suspect a defectiveflashtubeor
           triggercoil. See section3.
       (2) Try the goodlightingunit in the non-ftashingouilet.rf
                 it doesnotflash,suspecta defectivetriggercapacitor.

4. CHARGEINDICATORLIGHTDOESNOTGO OUT.
   Probablecause:
       (1) Defectivepowercapacltor.
       (2) Defectivelightingunit.
       (3) Defectiveflashtube"afterglow."
      "Afterglow"is a conditionin whicha flashtubecontinues
   to glowdimlyafterthe mainflashis over.whilethisglowpersists,
   thechargeindicatorlightwillnotgo out.Persistentor continuous
   afterglowindicatesa defectiveflashtube.A slight afterglow,
   lastinga secondor less,may occasionallyoccurin a normal
     f lashtube.

5. CHARGEINDICATORFAILSTO LIGHT.
   Probablecause:
       (1) Defectivechargeindicatorlamp.
       (2) Defectivepowertransformer.
     ,   (3) Defectivedischargerelay.
       (4) CapacitorC5 short-circuited.
       (5) Defectiverectifier.

6. MISFIREALARMBUZZERSOUNDSAFTERFLASH.
  Probablecause:
       (1) RelayK2 detective.
       (2) Defectivepowercapacitor.

7. MISFIREALARMSOUNDSAFTERFLASH.
  Probablecause:
       (1) Defectivelightingunit.



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8. MISFIRE ALARM BUZZER SOUNDS EVERY FLASH, ALL
  LIGHTSFLASHING.
   Probable cause:
        (1) Alarm switch left on when a light is unplugged.See
         page 9.
        (2) Defectivemisfirealarm switch.

9. MISFIREALARM BIJZZERDOES NOT SOUND EVENWHEN
  A LIGHTIS MISFIRING.
     Probable cause:
        (1) Wrong power plug is being used.
        (2) Misfirealarm switch turned off, or switch defective.
        (3) Defective relay K2.
        (4) Defectivealarm
        (5) Defectiveresistor R4, R5, R6, R7 and R9 or diode,D1B,
        D38 thru D41, also diode D5 thru D8.

F. INFORMATIONFORTHEELECTRONICSERVICEMAN
    Firstreadthe generalinformationgivenabovein the preceding
partsof Section6. lsolatethe troubleas far as possibleusingthe
chartof symptomsand probablecauses.

   Thesectionbelowgivesa detaileddescriptionof circuitopera-
tionto aid in servicing.

   AC Poweris steppedup to a highvoltagein transformerT1
andrectifiedby a bridgerectifierto providethe directcurrentwhich
chargesthe capacitorbank.TransformerT1 is not an ordinary
transformer.lt hasa specialmagneticcircuittunedwithcapacitor
C5 whichprovidesa stabilizedhighvoltageoutputfromthe second
winding.Approximately320voltsAC is tappedfromthisregulated
windingand outputwhichchargesthe capacitorbank.

    At fullcharge,the DCvoltagein thecapacitorbankwillbe held
withinthe rangeof 490 + 10Vregardlessof linevoltagevariations
between100and 125volts.Linecurrentmustbe 60 cyclesAC.
Thistransformerwill not performproperlyon SO-cyclecurrent.At
half-power,the DC voltagewill be 390 + 1OVDC.

                       17

q

   The maincapacitorbankconsistsof Cl, C2, Cg,andC4. These
four capacitorsare chargedseparatelythroughthe isolationrec-
tifier.Each of these capacitorsis separatelyconnectedto one of
the outputplugs,J1, J2, J3, and J4. By insertinga properlywired
power plug in socketJ8, the capacitorscan be connectedin any
combinationdesired.A wide choiceof outputpoweris thus available
to the photographermerelyby changingthe power plug.

    RelayK1, operatedby the 11S-voltpowerline,is providedto
dischargethe powercapacitorbankwhenthe unit is turnedoff.
When K1 de-energizes,the capacitorbank dischargesthrough
resistorR8, bypassingthe isolationrectifiers.

   A misflrealarmsystemis providedto alertthe operatorwhen
a lightingunitfailsto flash.Whena lightingunitfailsto flash,the
powercapacitorassociatedwithit will notdischarge.Thedifference
in voltagebetweenthiscapacitorandthe dischargedflowthrough
oneof the misfirealarmresistors,R4,R5,R6,or R7throughrelay
K2. RefayK2 operatesabuzzerwhichgivesan audiblealarmfor
severalseconds.Switches51, S2, 53, and 54 are providedto
disconnectthe misfirealarmfromanyoutlet.Theseswitchesalso
disablethe triggerpulseand modelinglampfromthe outlets.

    All lightingunitsare providedwith modelinglampswhich
operatefrom a low voltagewindingon transformerT1A.

   The triggercircuit,usinga triggerSCR,is connectedacross
the powercapacitorbank.

   As the powercapacitorscharge,the triggercapacitorsC15,
C16alsocharge.Whenshuttercontactsoperate,thetriggeringSCR
is gated,causingit to fire.C15and C16are dischargedthrough
triggercapacitors,C11 throughC14 andtheirrespectivetrigger
transformers.

   The highvoltagesparkfromthe secondaryof the triggering
transformerionizestheflashtube,causingit to dischargethepower
capacitorswith a brilliantflash.

                        18

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