tm 9-1653 data transmission system m6, 1942
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E
TEMM6
nMountMl)
ctedmatter Theinformationcontainedinre-
eessentialcharacteristicsofrestrictedmateriel
n knowntobeinthe serviceoftheUnitedStates
edloyaltyanddiscretionwho arecooperatingin
notbecommunicatedtothepublicor tothepress
arypublicrelationsagencies.(Seea/soparagraph
mber1942.)
NELONLY
Publ
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1942
E
TEMM6
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onofthe
19-23
24-32
r33-42
mbly43-51
climatic
trations
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TEMM6
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rthe informationandguidanceof
ersonnel.Itcontainsdetailedinstructionsfor
assembly,maintenance,andrepairofthe
mM6,supplementarytothoseintheField
eparedfortheusingarm.Additionaldescrip-
sareincludedto aidinprovidingacomplete
materiel.
ystemM6is forusewiththe90-mm.
stemnormallyservesafour gunbattery,
aybeusedequallywellwith asmaller
mis similartothedatatransmissionsystem
unmountswere equipped.
ystemoperatesasoneunit ofthecomplete
chincludesaheightfinderandan A.A.
a(firingazimuth,quadrantelevation,and
battery,originateattheA.A.director,and
ordials.Thedatatransmissionsystem
eadingselectricallytoindicatordialson
Handwheeloperatorsatthecorresponding
rsontheindicatordials toapplythedatato
nsmissionarrangementisusedbetweenthe
irector.
5volts,60 cycles,alternatingcurrent)
nsmissionsystemis suppliedbyagasoline-
ntgeneratingunit,M6orM4.Thesegenerating
ratetechnicalmanuals.SeesectionX.
ththissystemisfuzesetter M13(pre-
hisfuzesetteris describedinaseoarate
tionX.
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TEMM6
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andrepeaters4
catorM411
ntofoff-carriagecomponentsisshownin
ponentsforonegunareshowninfigure 3.
gs.7 and8)connectsthedirectorand
bycableandplugassemblies.Theactual
gecablesconnectedtothemain junction
ownin figure2,dependingontherelative
ectedequipment.Thecableandplugassembly
tfindertothedirectordoes notpassthrough
roughtintothe guncarriagethrougha
chispartof thecontactringassemblyand
tionary)part ofthecarriage.Thecable
ring assembly,whichprovidesasliding
boxontheupper (revolving)partofthe
ingofthecableasthegun istraversed.The
rminalbox (fig.11)arelocatedcentrally
nt.
nalbox endsinaplug whichfitsinto
unctionbox(fig. 12).Thegunjunction
rwhichprovidesa6-voltpowersourcefor
psintheazimuthand elevationindicators
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TEMM6
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BLY
EMBLY
LY
Y
Y
SSEMBLY
ngementofOn-carriageParts
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muthandElevationIndicatorsM4
echlight (fig.16).Thetwocablesfrom
uted totherightand leftsidesofthe
econduits,oneleadingtotheelevationindi-
junctionbox.
g.13) ontheleftsideof thecarriage
hefuzesetter isconnected,andaclamp
gthebreechlight.Aconduitand cablelead
dicatorsM4areidentical.Theyare
readeasilyand convenientlybytheazimuth
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TEMM6
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epeatersUsedin
4
operatorsofthegun.Theazimuthindicator
eandtheelevationindicatoronthe right
nfigure4.
MITTERSANDREPEATERS.
nsmissionsystemis basedontheuse
mittersandrepeaters.Thetransmittersand
ernatingcurrent.Foreachelementofdata
,analternating-currentsynchronoustrans-
ting-currentsynchronousrepeaters,andcon-
ed.Transmittersandrepeatersaresimilarin
esameelectricalconstruction.Repeatersofthe
andelevationindicatorareshowninfigure5.
erepeaterwith thenecessaryelectrical
hematicallyinfigure6.Itwillbe noticedthat
tersresemblesmallelectricmotors.How-
donotrevolvecontinuously,asin thecase
definiteangularpositionwhichisdetermined
smitterarmatureshaft.Therepeaterarmature
fthetransmitterarmatureshaft.Thetrans-
rector,andhasitsarmatureshaftpositioned
herein.Asthecomputeddatachanges,the
telyandtherebyprovidesacontinuous,definite
eddata.
sticofthistypeofdatatransmissionis
eshaftautomaticallyresets(synchronizes)
arpositionwith respecttothetransmitter
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S
E
ansmitterandRepeater
d.Becauseofthischaracteristic,thesystem
us."
amedata todifferentpoints,several
edinmultipletoa singletransmitter.Each
ghitwereseparatelyconnected,andisnot
atersexceptundercertainabnormalcondi-
VI.
gs.7 and8)isentirelyportableand
enientpositiontoaccommodatethedesired
irector.Itconsistsof adecagonalcast
ovablecover.Thebodysupportssix19
ainsanannularterminalring.Assembledand
njunctionboxareshownin figure17.
eptaclesCS6703(fig.18)arepainted
doneispaintedgreenfor thedirectorcable.
9409(fig.19)withmalecontactfingersis
ercablefromthe generatingunit.Thecover
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TEMM6
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ox(D28880J
wtheunitsto beconnectedtovariousre-
ecoverinthecorrectrelationtothe bodyis
Gasketsunderthe coverandreceptacles
nnectionsforassemblingcablestothe
wninfigure 20.Thisfigureisarrangedto
receptacleshavemalecontactfingers,and
pringterminals.
ns20 terminalplatesforinterconnecting
heseterminalplatesaremarkedwithnumerals
eralsontheterminalsof theconductors.The
owshowthe variousreceptaclesareinter-
minalring.Allfourgunreceptaclesarewired
alsandsymbolsto designatetheconductors
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oxwithCoversRemoved
mployedin accordancewiththefollowing
.
arse.
volts.
5volts.
forconnectionoftheportablecable to
by thefixedendofthe contactringcable
consistsof acylindricalhousing,which
shrigging assembly,andaterminalsegment
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EMM6
Mounf
dsectionedviewsofthecontactringare
othefixedundercarriageinthecenterof
eadingto thecontactringfromtherecep
ntisconnectedtotheterminalplatesin the
blyandtheseterminalplatesarein turn
gcontactscrewsinthebrushrigging assembly.
volveswithinthebrushrigging assembly
swiththe springbrushescontainedtherein.
he20 conductorsleadingfromthespindle
dconnectedinaccordancewiththecoding
erminalsare connectedtothecorresponding
inalbox(fig.30).
inaccordancewiththewiringdiagram
) mountsdirectlyoverthecontactring
ctringspindle.Thecableleading fromthe
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TEMM6
nMountMl)
otheterminalson theterminalstrips,(figs.
minalsareinturn wiredthroughanother
unctionbox.
ableandhasagasketforwaterproofing.
etweentheterminalboxflangeandthesup-
carriage.
s.12 and33)hasa rectangularbody
r.Thetopcoveris sealedbyagasket.The
tedwitha drainplugcontainingafiberglass
69409(fig.19) onthefrontofthe gun
matingplugofthe cable(fig.32)fromthe
clecoverisscrewedontothedummyrecep-
danglingwhenthecableisconnected.
eptacle(fig.34)and alightswitch
untedonthefront ofthebox.
ngglandstoaccommodatetheconduit
ductors.
area step-downtransformerandtwo
eterminalstrips carrystampedterminal
ncewiththewiringdiagramshownin figure
their attachedwirescanbeliftedoutof
removed.
gs.13 and37)hasacircularbody and
overissealedbya gasket.Thesumpinthe
dwithadrainplug containingafiberglass
77962(fig.38) receivesthematingplug
setter.
glandsto accommodatetheconduit
doutgoingconductors,andacableclampto
ghtcable.
are twoterminalstrips(fig.39).The
pedterminalplatesforwiringin accordance
owninfigure 47.
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SEREPEATER)
ElevationIndicator,M4
reboltedto therepeaterhousings.Thead-
edbyslottedflexibleshafts,accessibleoutside
foradjusting theupper(coarse)repeater
ht-handsideoftheindicatorandis acces-
ckcoverisswung open.Theslottedshaft
e)repeateris locatedonthelowerleft-
nd isaccessiblewhentheslidingcoveris
repurposelyadjustedat assemblytoturn
ibilityofaccidentalchanges.Stopscrewsare
eeth forlimitingtheadjustingmotion,to
ngtherepeaterwiring.To permitlargerad-
ommodatedwiththeslottedshafts,theinner
earrangedsoas tobeshiftedreadily,relative
ectiverepeaterswhenthethreeclamping
loosened.
terhasassembledonitsshaftthe inner
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heannular outerindex(fig.41)rotates
erindex.Thisouterindexis drivenfrom
driveofthe mount,throughadifferential
adjustmentsfororientingpurposesareintro-
andouter fineindexesisinthe ratioof1
o)changeinelevationorazimuth.Each
singleindexgraduationandtogetherthey
erelementsofa follow-the-pointersystem.
andtransmittedanglesisindicatedwhenthe
ched.Theouterindexalsoindicatesangular
tionsoftheouter(fine) scale,whichisgradu-
numberedat 10-milintervals.
eaterdrives theinnerindexforthe
arouterindexrotatesconcentricallywiththe
exis drivenbyawormfromthegear on
heinner andouter(coarse)indexesisin
0mils(1:1 ratio)changeinelevationor
e)scaleisgraduatedandnumbered(final
tervalstoprovidea coarseindication.
dtotheindicatordrivemechanismofthe
suchthat thedriveshaftmakes1turn for
ninazimuth,orelevation,asthe casemaybe.
ctingtheshaftwiththe correspondingdrive
rt ofthemount,notofthe datatransmission
anicaldrivesothatthe coarseandfine
actualazimuthorelevationofthe gunis
ntialgearmechanism(fig.41).Anysuch
bymeansofthemechanicalindexadjusting
toothededgeengagedbythedetentto
onceadjusted.Theknobisaccessiblewhen
caseoftheazimuthindicatorthis adjust-
timethe batteryisemplaced.Theelevation
essuchadjustmentonlyonce,wheninitially
dicatorishousedisweathertight.The
a suitableoilseal.Thewindowframeis
oftheinstrument,andis sealedbyagasket.
erableglassandis heldinplacebya
escaleand indexes.Twoarelocatedin
ft-handsidewhenfacingtheindicatorand
ntheright-handside. Forreplacementof
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,reflectorsareremovablebymeansof 4
right-handside,theshieldmayberemoved
top.Theselampsare standard6-8volt,2-3
G-6,(%-inch)bulbanddoublecontactbayo-
heindexesarepaintedwithluminous
thewiringoftheseindicatorsand the
atedtherewith.Theplatesontheterminal
erminalblockisassembledtothe cover
henthecoveris swungdown.
ntedontheguncarriageasshownin
sectionedviewsofthebreechlightare shown
breechlightbracketcontainstwo6-8
1)withG-3Vi,(%6-inch)bulband bayonet
edina receptacleassemblywhichisreadily
replacement.Thereceptacleassemblythreads
andis lockedbyaclampingscrewinthe
ntplasticcarriesthe lightfromthelamp
.Thisrod hasapeculiarpropertywhich
oundbendsandcorners.Therodis furnished
eassembly.Thetubeassemblyisheldinthe
dwhichpreventsentranceofmoistureto
heoff-carriagewiringare 20-conductor
.Eachcompletecableassembly(fig.43)in-
mblyC69778(fig.44)ononeend andaplug
ontheother.The receptaclehasmale
ughasmatingspring terminals.Contactfingers
ed.Theindividualconductorsareidentified
edtothecontactfingersand terminalsaccord-
gure46.
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STEMM6
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ssembly(C56703JforMainJunctionBox
ssembly(C69409JforMainJunctionBox,
eptacleBox
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TEMM6
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LE
LEAD
gAssembly TerminalBox
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EAD)
OTECTOPENING-
ACE
N
ER)
oxAssembledViewsandCrossSection
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TEMM6
nMountMl)
ptacleforGunJunctionBox
tacleforGunJunctionBox
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TEMMt
MMtMil
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gramShowingArrangementof
tingDevices
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ramShowingGearingforOuterIndexes
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TEMM6
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SSIONCABLE
DUCTORS
ALS
DUCTORS
ACE
RACE
E
CE
ACE
E
E
CE
E
CE
ACE
for20ConductorCable
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TEMM6
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4
m
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ECH
OGETHER,SOLDERED
E;
ACTRING
Gun
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STEMM6
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4
(fig.49)arefurnishedas accessoriesfor
nge:0-15and0-150volts.
ge:0-3and0-15amperes.
:0-10and0-1,000ohms.
eterareofthe movableironvanetype,
cent.Thevoltmeterandammeterarefurnished
erleadsbeingheavierthan thoseforthe
equirecareinselectionoftheproper voltage
f highervoltageorcurrentthanthatmarked
burn outthemeteror bendthemeter
thehighest rangefirst.Theammetermust
h,neveracross,theline.
et-sizeinstrumentforcontinuityand
urnishedwithtestleadsand aninternalIVa-
ructionsforuseareprinted onthebackcover
rcompensatingforchangeinbatteryvoltage,
agneticshuntisprovided.Thisshuntis to
eriesofreadingsso thatthemeterreadszero
orted.(Thebatteryrequiresreplacementif
stedtozeroreading.)Inusing the10-ohm
nalsareshortedby thelinkprovided.The
edifconnectedtoalivecircuit;it istherefore
movedfromthesystembeforeusing the
ERMl.
whenthedata transmissionsystemis
dpowerlinesor sourceofpowerotherthan
nit.Itis issuedonlyonspecificrequestof
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and M6,designedforusewiththe data
orporateatimedelayfeaturewhichappliesa
alsecondsbeforethefullvoltageis applied.
synchronoustransmittersandrepeatersto
ositionsslowly.
llvoltage,asfroma powerline,might
s:
tingrapidly,mightpickupsynchronous
tis,continuetorun athighspeedasa motor.
inreverseas arepeater,mightliftits
utingdevice)andthenallowit tosnap
msurface.
e currentfrompostorcommercialpower
ransmissionsystem,thevoltagecontroller
ssible damagefromtheabovementioned
ollerincorporatesatimedelayfeaturesimilar
nit.
peratesfromsingle-phasealternating-cur-
0cycles.
infigure50.
foreachof theportablecables,are
nsmissionsystem.
ereel,placetheplugor receptacleendof
lipatthecenterof thereeldrum.Laythe
epressionand startthefirstfewturns at
windingthefirstfewturns,checkto seethat
strained.Whenthefirstfewturnshave
y,continuetowindthecableinclose,even
engthisonthe reel.
sforusein repairingcablesofthedata
tconsistsofa conventionalportabletool
erandvarioustoolsandsuppliesnecessary
tionsandsheathrepairsonmultipleconductor
mpletesetofinstructionscoveringtheuseof
theequipmentcomprisingthekitasin-
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TEMM6
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TEMM6
nMountMl)
eringironof thekitareelectrically
orfrompowersuppliedby thegenerating
tpresent hasnoreceptacletoreceivethe
tools,butwillbe modifiedinthenearfuture
acles.Untilthesereceptaclesareadded,
nbemadeby connectingtheappliancewires
erearoftheinstrumentpanel voltmeter.With
onthemainswitchdoesnotcontrolthepower
he generatingunitmustbeshutdownwhen
ngthewires.
urnishedwith thesystemplugsintothe
unjunctionbox.
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materials20
es22
cators23
tedyellow,locatedontherearof the
dforconnectionoftheportablecable.As all
eenergized,itis necessarythatnodirectcable
efromtothedirector,heightfinder,orgun
tionshouldbemadeonlytotheyellowrecep-
box.Failureto observethisprecautionwill
ynchronoustransmittersandrepeatersinthe
otherwiseresultinseveredamagetothe
ERVINGMATERIALS.
ftinstrumentsandmachineguns(for
required).
cial(GREASE,special,lowtempera-
eregreaseis required).
rcleaningmetalcomponents).
gorALCOHOL,ethyl(forcleaning
aningindicatorwindows).
rd.
edwiththedatatransmissionsystemM6
btainable.Theimportanceofgivingthe
ecannotbeoveremphasized.
withstandrepeatedkinkingortwisting.
nashort radius,orallowingitto chafe
clesto runoverunprotectedcables.
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TEMM6
nMountMl)
reelsprovidedforthem,andprotectthe
notinuse. Storeinacool,darkplace.Heat
eteriorationofrubber.
kindtoaccumulateinthe plugsorrecep-
econnectionsaccomplishedbythem.
connected,closeallplugsandreceptacles
oasto excludedirtandmoisture.
nected,thematingplugsand receptacles
uredtogetherbymeansoftheroundnut
screwthecoverstogethertoprotectthe
able,graspthebodyofthe plugtopull
eorspring.
essarytotapetheendsofanyof the
cables,userubbertapeonly.Thesolventin
ontapewill intimedissolvethelatexin-
mentaltorubber;careshouldthereforebe
ablesare keptfreeofthesematerials.Ifoil or
bber,wipeitoffandwash theplacewith
NALBOXES.
variousboxesfastenedtightlyatalltimes
tandmoistureinto theboxes.
sarytoremovethecoverfroma box,care
amagethegasket.If thegasketisdamaged,
ertomaintainawatertightseal.
ontheboxesbymeansof thecoverspro-
nthecablesare notpluggedin.
ebottomof thecontactringhousing,
moisturewhichmighthavecondensedin
blyonly,lightlylubricatethebushingsat
ng spindlewithGREASE,lubricating,
TIONINDICATORS.
rtto "runaway,"thatis,runas amotor
utoffthe poweronthesystemimmediately.
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sedat alltimesexceptwhenactually
pairswhichrequirethatthecoversbe open.
topreventdamagingthegasketswhen
frame,ortheright sidecover.Ifagasket
placedinordertomaintainawatertightseal.
enotpermittedtolubricatethe indicator.
ntenancepersonnelshouldlubricateball
sandallothersliding surfacesoftheindicator
special.Thebearingsandsurfacesshould
blywithabrush.A fewdropsofOIL,lubrica-
tsandmachineguns,shouldbeplacedon
reshaftsenter thehousing.Repeatersare
adeto wipethewindowwiththehand
ueduseofa cleaningclothwillscratchthe
o seethrough.Removedustwithacamel
aper.Removeoilorgreaseby applyingliquid
olsparinglywithcamelhair brushandwiping
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TEMM6
nMountMl)
S
6
ction27
ess,appearance,etc28
es29
elevationindicator30
ION.
poseofdeterminingtheconditionofthe
ystem,whetherrepairsoradjustmentsare
ecessarytoplacethesystemin serviceable
ormedonthe systemisabasicinspection
ofthesystemand tolocatebasicfaults.
scontainedinthissectionareinstructionsfor
tofthis inspection,properdispositionofthe
ecessaryactiontakenorrecommended.
7228andO.O.F.7229,fig.52)areprovided
the inspection.Instructionsconcerningthe
ntedonthebackofthe form.
andcorrectioninstructionsinSectionVI
umentrepairmanifthe basicinspectionshows
ts.Fromthesedetailedinstructionsthere-
performsthespecificrepairrequiredto place
blecondition.Theprocedurefordetailedin-
ayvarywitheachsystem,dependingonthe
cinspection.Inspectionformsandmethods
edetailedinspectionaredescribedin
de,TheInstrumentRepairman."
rrors,arespecifiedwherenecessarytoindi-
cyrequiredinperformingcertainadjustments.
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S
EMATERIAL,
rm
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TEMM6
nMountMl)
sconsideredunserviceableiftheerror inany
tolerance.However,itmustberealized
eisintendedtoserve mainlyasaguidefor
supplementedbygoodjudgmenton thepart
erancesdonotnecessarilyinferthatthe
uldnotattempttoreducetheerrors tolower
nspermit.
EMENTS.
nspectionforthedatatransmissionsystem
theentire systemconnectedtothegener-
yadjusteddirector,heightfinderandthe
ncanbereadilyperformedat thegunbat-
atatransmissionsysteminthe field.The
nwillthenincludethefollowingtests:
NJUNCTIONBoxANDON-CARRIAGE
SS,APPEARANCE,MECHANICALCONDITION,
SOFFOLLOWERS,ETC.
torsbetweencorrespondinglynumbered
edcircuits).
betweenallseparateconductors(noihort
nthe plugsandreceptacles.
ceptaclecovers.
dreceptacle.
TIONINDICATORSM4.
devices(slottedflexibleadjustingshafts
b).
indexes.
al(outer)indexes.
CHRONOUSREPEATERSINTHEFIVEPRIN-
ONCHANNELS(FINEAZIMUTH,COARSEAZI-
COARSEELEVATION,FUZE).
onasconnectedtransmitter.
orintermittentfaults.
mpingdeviceinrepeater.
ssibletoperformthebasic inspectionby
cribedabove.Inthiscase itwillbenecessary
unitformechanicalconditionandforcon-
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S
ngconnections.Itcanbeassumedthatif
anicalandelectricalrequirements,andis
dproperly,thecompletedsystemwillfunction
ORINSPECTION.
electricalfundamentals.
ment(par.14).
heseareinthe instrumentrepairkit
emaintenancecompanies.)
eList(SNL)F-222(tocheckcomplete-
MPLETENESS,APPEARANCE,ETC.
ersofthe azimuthandelevationindicators
eofindicator)andanyadditionaldata
tification.
letenessofthesystem,andforcomplete-
uipment.RefertoStandardNomenclatureList
elistingof thesystemcomponents.
nboxandon-carriagepartsfor complete-
echanicalcondition.Seethatplugand re-
e,whereprovided,andthattheythread
eceptaclebody.Noteanysignsofabuse
torngaskets,etc.
ertightness.Anunbrokenfilmofpaint
lgenerallyindicatethata propersealexists.
ovethecoveroverthejointand examine
erdefects.Trythepackingglandfollowers
heinspection,whenpowerhasbeenap-
lluminationinthe azimuthandelevation
echlight,andtroublelamp.Trythe action
gunjunctionbox.
ABLECABLES.
thforcutsor tears.(Damagefromcuts
thatevenaslightcut ortearmayeventually
able.Sheathrepairsshouldbemadeassoon
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TEMM6
unMountMl)
nuityofall conductorsbetweencorre-
tacts(noopenorcrossedcircuits).Usethe
10ohm)settingfor thistest.Placethecable
ogetherandremovetheplugandreceptacle
ertestprodintothe plugterminalmarked
t prodtothereceptaclecontactfingermarked
showaverylowresistancereading(not over
.Continuetotestall correspondinglynum-
ctfingersinthesame manner.Anopencir-
eindicatedby averyhighor infinite
ormoreconductorsarefoundopen,test for
dcircuitwillbeindicatedbya continuity
orswhicharenotcorrespondinglynumbered.
cuits,orhighresistance(over2ohms)circuit
before thecablecanbeplacedinservice.
rcuitsarefound,testeachcableforinsu-'
econductors(noshortcircuits).Usethe
0-1,000)ohmsetting;atthissettingthe meter
hort circuit.Testfromeitherendofthe
makecertainthattheotherendof thecable
hconductorsystematicallyagainstevery
circuitis foundbetweenanyconductors,the
r.42).
f theforegoingtestsisincreasedcon-
xedprogressivelythroughoutitsentirelength
ermittentcablefaultsthatmightotherwise
ositivelylocatedbythisprocedure.
sin plugsandreceptacles.
ndreceptaclecovers.
receptacleproperlyengagesitsmating
chcableinthereceptacleontheotherend
togetherwith thenutofthe plugtosee
y.
UTHANDELEVATIONINDICATOR.
s.14 and15)onthe rightandleftsides
osesthetwoslotted flexibleadjustingshafts
entoftheelectricalindexes.Usingascrew-
ofturnsofeachshaft inbothdirectionsto
systemisknownto beinadjustment,take
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S
umberofturns tothestop,so thattheshaft
naladjustmentsettingoncompletionofthe
keaboutseventurnsbetweenstops,and
hroughoutitsrange.Thecorrectadjustment
matelymidwayintherange.Roughmotion
stingwormorflexibleshaft,probablycaused
sttheactionof thestop.Ifthe motionis
urnsit isdueto improperfunctioningof
screwsthreadedintotheadjustingworm
epairas thereisapossibilityof tearingthe
ftsideof theindicatorandturnthe
oughseveralrevolutions.CAUTION:Ifthe
djustment,notethecoarseandfinescale
etest,andreturnthe adjustmenttothese
test.Donotelevateor traversethegun
hould turnsmoothlywithnoloosenessor
ical(outer)indexesshouldfollowtheknob
shbyrockingtheknobgentlybackandforth
otion;backlashatthispointmust notexceed
eadjustingknob.If backlashisinexcessof
rrected(par.51 g.(4)).Turntheadjusting
finemechanicalindexestotheirzeroposi-
exes.shouldread zerosimultaneously.Note
ndexestobind againstthescaleorinner
ionsshouldbeclearlylegible.If possible,
eself-luminousmarkings.Thiscanbeper-
ngatthe indicatorfaceunderadarkcloth.
nductedwiththesystemconnectedand
TM9-370(90-mm.antiaircraftgunmateriel,
uredescribedbelowisto berepeatedfor
atatransmissionchannels(fineazimuth,
tion,coarseelevation,andfuze),usingtest
ngthedirectorthroughseveralof theauthor-
eelectrical(inner)index onthesyn-
ldduplicateanysettingofthe corresponding
Ifthere isaconstanterror,adjustthe re-
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TEMM6
nMountMl)
ttedshafttomakecertainthattheoperating
mentrange.
eelectricalindexto oscillateaboutits
ightoscillationispermissible,butalarge
veralsecondsindicatesadefectivedamping
peaterwitha defectivedampingdevicewill
naway."Sucha repeaterisunserviceable,
51).
stnottouch01 dragagainstthemechanical
ereisanydoubt,removethewindowover
byturning thedialgentlywiththe finger
owerforthistest.
ethrough360degrees,while watching
ringorreversaloftheindex positionprob-
contactinthecontactringassembly.
emustberepairedoradjustedto render
snotedandactiontobetakenmustbe entered
eachsystem.Theactionto betakenwill
esavailable.Ifthe facilitiesofthesection
accomplishmentoftherepairoradjustment,
nentswillbepassedontoa highermaintenance
msshouldthenbeissuedtotheusing arm.
dbythecompletionofthebasicinspec-
nedtobe inserviceablecondition.Ifminor
correctedarefound,thenecessaryrepairs
stemtherebyplacedin serviceablecondition.
end themselvestosimplerepair,asthey
eforethenecessaryrepaircanbe accom-
und,further inspectionwillbenecessary
nprocedureindetail,anddeterminethespecific
acethesysteminserviceablecondition.Pro-
tionandcorrectionisdescribedinSectionVI,
fieldare,of necessity,themostrapidand
ablethatwillrestorethesystemtoan operable
maybe necessarytousespareconductors
gethewiringfrom thatinthe'standard
obe necessarytodisturbthestandardized
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S
t(par.34)ofthesynchronousrepeaters.
sarepermissible,butmustbeconsideredas
.Athoroughrecheckofconnectionsandad-
rdizedconditionsmustbemadeassoon as
doso.
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TEMM6
nMountMl)
AR
ection33
gelectricalzero34
peatersremaininoperativeor fall
operation35
peatersrotatein oppositedirection
mitter36
peaterslag behindthetransmitter
on37
sto cometorest,butoscillatesabout
8
mainsstationaryfora time,thensud-
andagainremainsstationary39
tsincontactring40
of illuminationintwoormoreunits 41
LEDINSPECTION.
aseoftheinspectionaregenerallythe
the basicinspection.
ignedforthis datatransmissionsystem
eshopsandarsenals.Thetestinginstrument
ectorbecauseitcontainsfivesynchronous
atethesametypeoffiringdata asthatwhich
ttotheguns. Thesynchronoustransmitters
rewired andadjustedinaccordancewith
dthereforeshowcorrectoperationofthe
hetestinginstrumentisnotfurnishedforfield
operationare thereforenotincludedherein.
InstructionGuide,TestingInstrumentfor
dicatorsofDataTransmissionSystems,M4,
ms,MlandM2,November15,1941) for
ctionswhenusingthisinstrument.
TERMININGELECTRICALZERO.
erchangeabilitybetweensynchronous
mittersandrepeatersarecommonlysetto a
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AR
ositionknownas"electricalzero."Thisposition
nastheposition whichtheunitwillassume
ctionsaremadetoacertainstandardized
ngset toreadzeroonits scale(fig.53).
enstandardizedonelectricalzerowillread
justmentwhenconnectedina normaldata
dthatanelectricalzerosettingisnot
peration.Theonlyessentialrequirementis
ame asitscorrespondingtransmitter.Ifthe
tmade,the featureofinterchangeability
st.
calzeroofa synchronousunitproceed
oftheunit marked1,3,and5(odd-
e 115volts,alternating-currentpowerline,
d4 (even-numbered)totheotherside.
nergized,therotor, ifunrestrained,will
verycloseto thatdennedasthezero posi-
adegree).
urbingtheconnections,breakthecon-
rked2,leavingit open.Withthepower
r,ifunrestrained,willassumeeitherthe exact
aposition180 degreestherefrom.The
stinguishbetweenthesetwopositions.
andardizediftheelectricalindexreads
(or canbebroughttozero readingbythe
haft)whentherotoris intheexactelectrical
izingadjustment,turntheslotted ad-
f itstravel.Adjusttheelectricalindexto
scalewhentherotorisi ntheexactelectrical
adjustmentbytemporarilylooseningthe
theindexontherotor shaftandturningthe
thattherotoris notdisplacedfromits
ctionalforces.
erterminals4and5must notbeinter-
.Thatis, theterminalmarked4onthe
nalmarked4onthe repeatermustbecon-
thepowersupply.Reversalofterminals
d180degreesoutof agreement.
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TEMMA
nMountMl)
ElectricalZeroSeting
kingoftheterminalsofaunit, therotation
otation,correctbyreversingtheconnections
3. Reversalofanyotherterminalswill
0degreesoutofagreement.(Itwouldbe
ecorrectlymarkedbeforebeingissued.)
RMOREREPEATERSREMAININ-
OFSYNCHRONISMDURING
dicatesanopencircuitor shortcircuit
,repeaters,orconnectingcable.Itmayalso
onin azimuthduetoafaultycontactring.
haracteraresometimesdifficulttolocate
istently.Therefore,whenanintermittentfault
utdisappearsbeforebeingcorrected,acom
nceshouldbemadebyusing personnelto
eshould itrecurlater.
minewhetherthetroubleis duetoa
anindexbindingatsomepoint. Seepara
mechanicalfaultshouldbe definitelyelimi
withtheelectricaltests.
oceedtolocatetheparticularunitat
onof thecircuitinwhichthefault occurs.
arepeater,allotherrepeatersconnected
somewhat,butthefaultyrepeaterwillusually
ffect.Whenthefaultyrepeaterisdisconnected,
off powerwhiledisconnecting)atthere
onbox,or(forfuzeindicatorsonly)gun
nt,thebalanceofthesystemwillfunction
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AR
ptis notsuccessfulinlocatingthefaulty
aprocessofelimination.
transmitter,allrepeaterswillbeaffected
etoeliminatethefaultby disconnecting
typemaybe.foundin eithertransmitter
nsistofa defectinabrush,brushrigging, or
circuitinterruptionataspecificangular
maybeineither thefieldorarmaturede
rer'spractice.Thelocationmaybefound
erorvoltmeter-andammeter.Inanycase,
edwithinaunit,theunit mustbereplaced
ceable.Noattemptshouldordinarilybe made
eror repeater.
madewiththeunitdisconnectedfrom
eaters,attheappropriateplug.Powermust
notremovedbytheabovedisconnection.
obe connectedtoanyconvenientplugor
hareconnectedtotheunit(refertowiring
successivelytheresistancebetweenterminals
reerotationineachdirection.Opencircuits
edbya sharpswingofthemeterneedle.
hatthefield (4-5)terminalsbeenergized
s,60cycles,withotherterminalsdiscon
medbydisconnectingattheappropriateplug
singleadstopointsconnectedtotheabove
uslytoavoidshortcircuits).Connectthe
successivelytoterminals1-2,2-3,and1-3,
hevoltagevariationovera 360degreerota
voltageshouldrise andfallsmoothlyfrom
it isrotated.Asuddenvoltageinterruption
dicatesa defectiveunit.
d armaturecurrentsmayalsobemade.
ersare measuredunderthesameconditions
cingtheammeterinserieswiththe power
saremeasuredwiththesystemcompletely
ng.Thevalueofthearmaturecurrentat the
uldbeveryclosetozero.High currentindi
rcuit,anopenfield circuitoranincreasein
emechanicalfaultssubsequentlydescribed.
ntsinexcessof0.3amperemayresultin
catethatpowershouldberemoveduntil
ectedorthefaultremedied.
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TEMM6
nMountMl)
andresistancereadingsfortheforegoing
esereadingsmay,however,varyconsiderably
5volts
)approximate..7ohms16ohms
mate0.9amp0.4amp
3):
105volts105volts
,2-3,'or3-1)
ms
undintheindividualunits itwillbe
cebackthroughallcircuitconnections,check-
ndcontinuityofconductors.Refertowiring
RMOREREPEATERSROTATEIN
MTHECONNECTEDTRANS-
a repeatermaybereversedbyinter-
matureconnections(1,2,and3). Ifthe
scorrect,itmayberetainedby confiningthe
marked1and3on therepeater.Theother
atetheelectricalzeropositionbyplusor
hangemaybemadeanywhereinthe wiring
ndtherepeater.Inthe caseoftransmitters,
ters,reversalatthetransmitterterminals
will reverseallfourrepeaters;reversalat
carriage)willreverseonlythe singlere-
fectingthedirectionsoftheothers.
RMOREREPEATERSLAGBEHIND
HERDIRECTIONOFROTATION.
excessivemechanicalload,orinsufficient
eamountof lagwillbefoundto varywith
andmaybecomezerowhenatrest.
rthevoltageat thegunindicators,or
maybeincorrect.Asystemvoltagebelow
over40voltsbetweentransmitterandre-
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AR
ocausethisdifficulty.Anopencircuitin the
ror repeaterwillalsocauseagreat reduction
nassumingeitherof twopositions180de
ity.
alloadsuchasatightbearingor binding
ion.Theoverloadinthis caseismore
hatdescribedabove,butasimilar procedure
ationandremedy.
ssibleindexes,asimpleandofteneffective
xasmallamount(say1 degree)firstinone
If theindicationreturnedtoinboth cases
aldifficultyoradeficiencyoftorqueis
EATERFAILSTOCOMETOREST,
TSSYNCHRONOUSPOSITION.
fectivedampingmechanisminthere
ple repeaters,allrepeaterswillusuallybe
hedefectiverepeaterwillusually'oscillate
misbuiltinto therepeater,anditsrepair
Thedampingmechanismisdesignedtobring
180degreesdisplacementwithinthreeseconds.
rge,itmaybe possibletoretaintheunit
erageratherthantheinstantaneousmotion
rdrive.Whentheoscillationistoolarge for
withtheuseofother connectedrepeaters,
ectedasunserviceable.Ineithercasethis fault
erepeater.
efectivedampingdevice,therepeater
nd,ifit startstorunas amotor,powermust
ematonce.
EATERREMAINSSTATIONARYFOR
OTATES180DEGREESAND
ARY.
catesanintermittentshortcircuitbetween
s andwillbeaccompaniedbyanabnormally
rpositions.Powermustbe removedfrom
henthisfaultisnoticed,as excessivearma
windingsmaybe burnedout.Thiscondition
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TEMM6
nMountMl)
eactingtorqueonthe transmitterwhich
catemechanismsconnectedthereto.Pro-
rcuitsinarmatureleadsis giveninpara-
CATINGFAULTSINCONTACTRING.
ssemblyismountedon theguncarriage,
edureistodisconnecttheplugconnectionon
st betweenthisplugandthereceptaclein
box.Thetestisconductedinexactlythesame
g(par.29). Tocompletelytestthecontact
ytotraversethe guncarriagethrougha
geachconductorforcontinuity.
in thismanner,theconductorspass
swell asthroughthecontactring.Hence,
dcircuitsarefound,checktheconnections
proceedingwiththe moredifficultoperation
actring.Anopenorshort circuitthrougha
anbe takenasapositiveindicationofa
Ashort circuitoffairlyhighresistance(a
andohms)generallyindicatesexcessive
ghousing.
arecorrectedbydisassemblingtheunit
eaningtheinteriorsurfaces.Removecorro-
actring surfaceswithSOLVENT,dry-clean-
elightlywith CLOTH,crocus,orPAPER,
merypaperoremeryclothon thecontact
EISFAILUREOFILLUMINATIONIN
eofilluminationfailureisburned out
sremedyistoreplacethelamps.If, how-
branchofthewiringremaindark afterre-
g(terminalsLjandLL,)inthat branchfor
inationwillprobablybedue toade-
tswitchinthegun junctionbox.Verifyby
sterminalsL(andL.,in thegunjunction
eadingis6 voltsorslightlymore.If there
erminalswith thesystemenergized,checkthe
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AR
ormerprimaryconnections(terminals4and
nectedintheprimarycircuitofthetrans
eis detectedandlocated,thecablemust
erformsheathrepairsandother cablerepairs
ecablerepair kit(par.17).
blecableandthearrangementis,orcan
cablesfurnishedarenotinuse, substitute
yonewhilemakingthe repair.Allportable
terchangeable.
uentlyberepairedbysubstitutinga spare
hefaultyconductor.Ifthe faultisashort
reconductors,oneconductormayremain
erofthe shortedconductorsmustbediscon
dup(userubbertape only)atbothends.
nishedhasoneidle conductortapedupfor
,theconductorsconnectedtoterminals4
ugsand receptaclesareconnectedexternally
neoftheseconductorsmaythereforebe
neoftheotherconductorsdevelopingan
sareavailable,itmaybe necessaryto
ductorandsubstituteanexternalwire,im
Ordinarily,No.14rubberinsulatedwire,
wiring,maybeemployedsatisfactorily.Since
rminalstripconnectedcannotthenbeclosed
utionsmustbetakento prevententranceof
othercovering,
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oogle
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TEMM6
nMountMl)
MBLY
andassembly44
5
eceptacles46
oxes47
contactringfromgunmount49
g50
ndelevationindicatorM451
semblyproceduresdescribedhereinare
cemaintenancepersonnel.
emshouldalwaysbekept totheminimum
ecessaryrepairsor adjustmentstobe
semblyisdeterminedbytherepairman
dinspection.
hereverseofdisassembly.Thevarious
tbeassembled,andthenthesubassemblies
esystem.Wheretheassemblyoperationsvary
ocedureofthosefordisassembly,adescrip-
f assemblyisincludedinthismanual.
entinmarkingortaggingpartsas they
evaluabletimewhichwouldotherwisebelost
ng reassembly.Handleallpartscarefully.
SEMBLYANDASSEMBLY.
heseareinthe instrumentrepairkit
emaintenancecompanies.)
tainersof sufficientsizetoholdsmall
bled.
.
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MBLY
LDERING.
apethesurfacestobe soldered.Copper
henproperlycleaned.
pasteform,orinthe self-containedcore
sarefurnished.Whenusing paste,daba
asteon thecleanedsurfaces.Fluxinself-
specialapplication,asitwillflow properly
applied.
aroundtheterminaldeviceorother
t amechanicallysolidjointbeforesoldering.
edaroundcontactfingersorterminalsin
tmustbestrippedbackaboutVi-inchand
e.Rememberthatthe solderisintended
calcontact,andisnotintendedto with-
ointofa hotsolderingiron,andflow
ejoint. Removethesolderingironand
oodjointshouldshowathin continuous
psorexcessofsolder.Iftoo muchsolder
hejointwith thesolderingironandallow
iron.
dpartsapplya hotsolderingirontothe
,thenpullthepartsawayfromeachother.
ofpartsto preventcharringtheadjoining
ronis attheproperworkingtemperature
nned,notmorethanafew secondswillbe
olderingoperation.Anironthat istoocold
s,andrequireprolongeduseofthe ironin
ts. Anironwithapitted orimproperly
faults areacceleratedbyoverheatingofthe
e,andwillalsoprolongthe operation.
GSANDRECEPTACLES.
ptaclesusedthroughoutthedatatrans-
either oneoftwosimilarbasicpatterns,
ntactfingersandtheotheremployingspring
eceptaclesusedontheportablecablesare
hesepatterns.Thedisassemblyandassembly
sandreceptaclesmay,ingeneral,befollowed
ceptaclesinthesystem.
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TEMM6
nMountMl)
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MBLY
mblyofPlugAssembly(fig.54).
exposethespringterminalopenings.
ewdriver,pryoneend ofthesplitre-
ygroove.Continueworkingfromthisend
forremovalfromthe groove.
gringhasbeenremoved,theinsulation,
hespring terminalinsulatingplatecanbe
wn.
ytoincreasetheslackinthewires to
nthefoll&werandpush thecablethroughthe
rnquitehard whenbeingloosened,because
ndagainstthe grooveinthefollowerand
nagainstloosening.
minal,unsoldertheoldterminaland
ace.Seeinstructionsforsoldering,paragraph
refromwhicha terminalhasbeenunsoldered
olefromwhichitwasremoved.Seefigure46
ycolorcoding.
,slip eachspringterminalintoitshole
etheinsulationoverthegroup orterminals,
slotsinthe plateandinsulationinline with
ctgroupintothe plugbody.Thelocating
sedkeyinthe body.Workthesplitretaining
thebody.Tightenthefollower.
yandassemblyoperations,involvingre-
ure 54maybeperformedifrequired.
mblyofReceptacle,Assembly(fig.55).
overtoexposethecontactfingers.
verorsimilartool,freeanedge ofthe
ncarefullypullthe gasketclearofthecontact
ewdriver,pryoneend ofthesplit
odygroove.Continueworkingfromthisend
forremovalfromthe groove.
gringhasbeenremoved,theretaining
andtheinsulatingplatecanbe liftedout
ytoincreasetheslackinthewires to
nthefollowerandpushthe cablethrough
llturnquite hardwhenbeingloosened,
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TEMM6
nMountMl)
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MBLY
willexpandagainstthe grooveinthe
erablefrictionagainstloosening.
ger,unsolderthe oldcontactfingerand
.Seeinstructionsforsoldering,paragraph45.
omwhicha contactfingerhasbeenun-
same holefromwhichitwasremoved.See
ofwiresby colorcoding.
ptacle,slipeachcontactfingerintothe
and thenplacetheretainingplateoverthe
eepingtheedgelocatingslotsin theplates
thiscompactgroupintothereceptacle
eup withthepressedkeyinthe body.Work
ckintoitsgrooveinthe body.Fitthesoft
tactfingerssothat thenumberedholesin
umberedholesin theretainingplate.Seat
ts groove.Tightenthefollower.
yandassemblyoperations,involvingre-
ure 55maybeperformedifrequired.
FROMBOXES.
sfromboxesorterminalstrips which
etime,it willoftenbefoundthatthe rubber
hecover.Tofacilitatebreakingthis bond,
opermitthe insertionofanarrowchiselor
erloose.Afterthecoverhas beenloosened,
ttoinsert thetooltoa pointwherethegaskets
stalsobe takennottonickthesealing sur-
nd thusimpairtheeffectivenessofthe
ersmustbeproperlyreplacedandtightened
mpness.
variouswiringboxesareconveniently
rminals.Terminalsandterminalplatesare
fication.Thewireconnectedtoeachterminal
fyingcolor.Refertofigures 46,47and48
orcoding.
EMOVINGCONTACTRINGFROM
gunmountabouttwofeetfromthe
Elevatethegun untiltheequilibratorparts
owworkingspace.
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TEMM6
nMountMl)
gTerminalBoxWires
erminalBox
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MBLY
xcoveranddisconnectthewireterminals
.56). Besurethateachwirecanbe properly
n.Ifmarkingsorcolorsdonotagree withthe
gs.46and47),tageachwire beforediscon
x(fig.57)
eceptacleretainerplateovertherecep
eptaclebox(fig.58).
ottomclosureplate.Tapealengthof
ble.Removethecontactringretainingscrews
ring tothefloor(fig.59).
actring,proceedinthereverseorder
l.
NTACTRING(fig.60)
segmentwiresleadingintothecontact
ox.Besurethat eachwirecanbeproperly
n.Ifmarkingsorcolorsdonotagree withthe
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TEMM6
nMountMl)
ontactRing
gs.46and47),tageachwire beforediscon-
ws(1,fig.60) intheedgegroovesofthe
spindleandbrushrigging assembly(2)out
workingparts willthenbeaccessiblefor
mbly.
brushrigging assembly(3),removethe
hesupportingchannelandprythechannel
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BLY
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MBLY
ndfineindicatorswillbe requiredatthis
owever,forminordisassembly,itisadvisable
ymarkinga lightpencillineacrossthe
xmeetsthe adapter.
escaleand indexes,adjusttheouter
eroreading,asfollows:Turnthedrive shaft
arseindexstandsatthezero graduationof
escrewswhichhavebeentemporarilyplaced
dex,andrefastenthisindexinthe position
ssembly(figs.67to72).
crewsintheedge ofthecover(fig.67).
helampshieldandlamp(fig.66). Thelamp
ge withoutfurtherdisassemblyofthe
ASSEMBLY.
dterminalscrews(fig.69)so astofree
ssembly.Removethecotterpin(fig.70)
n
EMBLY.
ockassemblyisseldomrequired.For
fpartsrefertofigures 71and72.
tingKnobCoverAssembly(figs.73
tounlatchthecover,thenraisethecover
retainingspring (fig.73).Removethe
.Thelampsmaybereplacedat thisstage
blyoftheindicator.
ASSEMBLY.
erretainingscrew(fig.74)and pullthe
heindicator.
rtsis seldomrequired.Forremovalor
rtsrefertofigure75.
thRepeatersAssembly(figs.76to80).
kwasherin thefineindexadapter(fig.
asheroutofitsgroovein therepeatershaft
lkeywhichfits intothekeywayinthe
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TEMM6
nMountMl)
inebetweenthegearandthehub as-
hegear.
ustingshafts(fig.77).
alindexadjustingknobgroup(fig.78).
pitwill benecessarytoapplynewsealing
eoftheadapter.)
ormbracketassemblies(fig.78).Each
escrewsandlockwashers,andlocatedby two
ngthesebracketsbesureto meshtheworm
aterwormgear,betweenthestopscrews.)
mbly(figs.78and86) leavingtheball
thehub. Thespecialtoolshowninfigure78
utis difficulttoremove.Thistoolisnot
trepairkit,but shouldbepreparedlocally.
wormbracket,assembly(fig.78).The
escrewsandlockwashers,andlocatedby two
sandlockwashers(fig.79) whichsecure
sassemblytotheindicatorcase.Pullthe
time,fromthepassageslotin thecase.
andpullit forward,outoftheindicator
omBracketwithRepeatersAssembly
tthepoints showninfigure81.These
terminingtheproperslackintherepeater
Todetermineproperslack,dressthewires
e repeater(fig.82)andturnthe repeater
motion.Itmaybe helpfultotemporarily
ormbracket.Thereshouldbejustenough
gmotionof therepeaterswithoutstrainor
adjustmentlimits).
bound withheavycottoncord(fig.82).
y,andthe wirespulledthroughthebracket
erscanberemoved.
ter,removetheclip(fig. 83)oneach
henpulltherepeateroutof tHebracket.
romBracketwithRepeatersAssembly.
,assembly(2,fig.84) andthenut(3)
movethekeyedwasher(4).Pullthegear
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MBLY
shaft(ball bearingsneednotberemoved
ferentialspideron asolidsupportingblock
n(6)whichsecuresthespider (7)tothe
roup offtheendofthe driveshaft.Pull
he endofthedriveshaft.
differentialparts(fig.84) maybeper-
itbe necessarytodriveoutanyofthe
woodendriftand tapthebearingout
incleanwaxedpaperimmediatelyon
hedriveshaftparts,spotmark both
ocatethemaccuratelyforreassembly.
removetheretainingrings. Pushthedrive
of thebracket.Theouterbearingrace
mtheremainderofthe bearing,asthisis
etotypeballbearing.Pushtheouterrace
eassembleitwith theremainderofthe
sincleanwaxedpaper.
driveshaftand differentialparts,replace
rcase.Checkforbacklashinthe mechanical
ckingtheknobgentlybackand forthwhile
onary.Ifbacklashexceedsone-halftooth
nob,itmustbe removed.Totakeupback-
romthecaseandpush thedriveshaftforward
ontretainingring (fig.85)andtighteningthe
cklashiswithin thelimitsdescribedabove.
tsfromCoarseRepeaterwithGear
movalshowninfigure86.
rnalkeywhichfitsthekeywayinthe
sfromFineRepeaterwithGear
movalshowninfigure87.
antthatbothballbearingsinthe hub
ondition.Anyhighspotorbinding ineither
uceerrorsin theindicatorreading.Asan
replacementbearingisnotavailable,itwill
serviceablebearingofthesamesizefromone
kets.Theunserviceablebearingmaythen
djustingworm.
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TEMM6
nMountMl)
,
BLY
levationIndicator,M4 RightSide
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MBLY
lev0ndic0,4LeSIde
etAssembly(fig.88).
potmarkbothretainingrings(fig.
rreassembly.Also,markthepinion
ssemblyshowninfigure88.
ts(figs.89to91).
assemblyshowninthefigures.
setheadjustingwormswhenreassc
thehexagonalopeningshouldbetov
stingKnobGroup(fig.92).
scribealightlocatinglineacrossthe
gknobandthegear.
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BLY
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BLY
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TEMM6
nMountMl)
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MBLY
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TEMM6
nMountMl)
ER
ed
utthetaper pin.
mIndicatorCase(figs.
methodof disassembly.
g. 96)useaIVi-mcl
omtheinside ofthecase,
blockanddrivetheoil sealin
nthereverseorderof disassemblyunless
ouspartsandmechanismsshouldbein
roceduregiveninsectionV.
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MBLY
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TEMM6
nMountMl)
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BLY
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TEMM6
nMountMl)
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BLY
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TEMM6
nMountMl)
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BLY
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TEMM6
nMountMl)
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BLY
M
BLY
oupsPrior toRemovalofBracket
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TEMM6
nMountMl)
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TEMM6
nMountMl)
gMarksBeforeDisassembly
RWITHHEAVY
ERSLACKIN
SBEENDE-
racket,ShowingRepeaterWires
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BLY
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TEMM6
nMountMl)
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MBLY
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TEMM6
nMountMl)
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BLY
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TEMM6
nMountMl)
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BLY
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TEMM6
nMountMl)
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BLY
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TEMM6
nMountMl)
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BLY
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TEMM6
nMountMl)
ER
ampSocketTerminals
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MBLY
EW
EW
mpSockets
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TEMM6
nMountMl)
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nspots,aswell asunavoidableblemishes
ustingoperationsshouldbetouchedupwith
practicalcolormatchoftheoriginalfinish.
the azimuthandelevationindicatormay
ack(or white)paintonthefront(or rear)
emptshouldbemadetorepairtheluminous
slucentscalegraduations.Iftheindex mark-
lydamaged,replacetheentirepart.
aintedbeforeissueandfrom timetotime
onditionsandclimaticconditionstowhich
mustbe supervisedbysomeonefamiliar
nstruments.Careshouldbe exercisedthat
withscales,gearteeth,bearings,or locating
ntonbearingsandother finelyfinishedparts
must bedryandfreefromdirt, oil,grease,
SOLVENT,dry-cleaning,andrinsewithhot
m.Itmustberememberedthatfrequent
entsinthesamebatchofsolventwill soon
se,sinceiteasilybecomessaturatedwith
ventmust bechangedfrequently.Rough,
nishedshouldbefiled orgroundtoremove
ltin apoorfinish.
T.
oundmarredpartsbymeans ofPAPER,
sesand.
ndvarnish,ifthepaint isinbadcon-
movalinentiretybeforepaintis applied.
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TEMM6
nMountMl)
mesfromthe can.Allowtheremovertostay
crapedorwipedoff.Keepit outoffinished
emoverisveryinflammable,properprecau-
nusingor handlingit.SeeSNLK-l and
twitha brushorspraygun.Exercise
prayingpaint onpartswhicharenotto be
ustconformtoauthorizedprescribedhues.
ntproportionsarepermissible,ifnecessary
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ALCLIMATICCONDITIONS
sunderdesertconditions54
e55
URFACESUNDERDESERTCON-
hedglasssurfacesorfinishedmetalsur-
ovalofdustandsandto preventabrasion
tRequired.
with fairlystiffbristles.
rbrush.
nchessquare.
oth10inchessquare.
ing.
ebrush.
voidscratchingtheglass.
entlestrokesof thecamel'shairbrush.
singthe glasssurfaceswithwaterand
aningfluidtothe glasswiththecamel's
esecloth
OISTURE.
cedinsomeclimateswiththeaccumu-
ataindicators.Thefollowingprocedures,
rimentunderadverseclimaticconditions,have
edyingthiscondition:
partialoverhaulandcloseinspectionof
veaccumulatedmoisture,todetermineand
eaksinto theindicatorhousing.Toaccom-
questionshouldbeuncoupledfromtheir
dremovedtoadry roomwherethevarious
,andcoverplategaskets,etc.,maybein-
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TEMM6
nMountMl)
yprocedurestakenforrestoringthemtoa
rect seepageintotheindicatorcases
ailproceduresforobtainingwatertighthous-
nedbytheactualconditionsencountered
rexample,thesmallmachinescrewsused
ave,in somecases,permittedseepage.On
er,thesescrewholesarenotsupposedto go
nd,if properlymachined,willcauseno
ppedthrough,thescrewsshouldbeslushed
omakethemwatertight.Theextraboss for
onductorconduitshouldbecheckedforser-
dertheclosureplug,and thepackinggland
hould bebackedoutandtheconepacking
oesnotcompletelysealthecircumference
edrive shaftoilsealshouldbe examined
placedif necessary.
rsandother internalpartsfromthe
eattemptedunlessabsolutelynecessary,and
ersonnel.Evidencesofsurfacemoistureon
movedbylight swabbingwithdrycloths,
bjectedtoa flowofdry,hotair forathorough
ngthevariouscovers,etc.Thereconditioned
atorsshouldthenbelubricated,reassembled
ctivegunmounts.
nsthepreservationoftheabovedry con-
plishedoveraperiodof oneyearfromthe
bjectingtheindicatorstoaperiodicalwarm-
re operatedonehouraWeek.Thispractice
cordancewithclimaticconditionsoractivity
uldbestrictlyobservedduringrainyseasons
materiel.
heaboveprocedureswillmaintainthe
onditionforatleastoneyear.It is,therefore,
endofeachyearthe indicatorsbesubjected
reconditioningasoutlinedabove.
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sts56
57
LATURELISTS.
n,M6(for90-mmA.A.
mmA.A.gunmount,
211
Ml(Keuffeland Esserand
M2(BauschandLomb). .SNLF-189
167
F-5
F-227
nt,gun,antiaircraft,90-
andequipmentSNLD-28
SNLF-202
3SNL F-200
uipmentSNLF-206
r,Ml bodypartsand
ubricationmaterials,recoil
aritemsof issueSNLK-l
clatureListsareastabulated
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