Pentax P3 User manual

Similarmodels:P5(mechanicallythe
same).SuperProgramandA3000
(electronicallysimilar)
Product#:P30(domesticversion)—
25300;P3(Americanversion)—
25301
Batteries:2eaS76(negativeground)
Fig.I —topcoverremoved
Fig.2 bottomcoverremoved,wind
leverheldpartiallyadvanced
Fig.3—topview,windside
Fig.4 -frontview,mirrorbox
removed
Fig.5-—mirrorbox.bottomview
Fig.6 undersideofPCboardT100
(Ilex)
Fig.7—topviewofwindside,mirror
boxremoved
Fig.8—bottomviewofwindside,
ratchetwheelremoved
Fig.9—topviewofwindside,wind-
ingsealremoved
Fig.10topviewofwindside,wind
shaftremoved
Fig.11—undersideoftopmechanism
plate— reassemblyposition
ofpawl
Fig.12—topviewofwindside,top
mechanismplateremoved
Fig.13—sprocket-hooktiming
Fig.14—sprockettiming
Fig.15—counter-geartiming
Fig.16— testpoints,undersideofPC
boardT100(flex)
Fig.17—lestpoints,main-switch
block
Fig.18—testpoints,LEDblock
Fig.19—wiringvariations,earlystyle
PCboardT100
Fig.20—testcircuitforoptical
encoder
Fig.21—wiringpictorialandtest
points
ADJUSTMENTLOCATIONS:
Aperture-controlvoltage
Autoexposure
Focusingscreen
Wind-completionswitch
Sprockethook
Traveltime.2ndcurtain
Traveltime,1stcurtain
Timingswitch(fastspeeds)
Shutterrelease
A
B
C*
D
E
F
G
H**
I
PENTAXP3,P30
Notshown:
Aperture-valueresistor.Variableresis-
toratbackoffrontplate,windside
top(nearmirrorbox).
Mirrorangle.Hexnutonwindsideof
mirrorbox,undermirror(reach
throughlensopening).
•Therearefouradjustmentpointsfor
theheightandlevelofthefocusing
screen.Toreachthetwoadjustments
atthefront,removePCboardT100
(flex).However,ifthefocusatthe
focusingscreenisincorrect,youcan
makeminoradjustmentsonthemir-
rorangle.Usea 2.5mmhexkeyto
turnthehexnut.
**lfyouadjustthetimingswitch.
applyconductivepaintbetweenthe
timing-switchadjustmentandthe
shuttermechanismplatetoimprove
theground.
ADJUSTMENTVALUES:
Curtain-traveltime:6.05± 0.3ms
(21mmdistance),5.76ms(20mm
distance)
Flange-focaldistance:45.46±
0.04mm(flangetofilmrails)
Aperture-controlvoltage:500±
l00mvP-P
Batterycheck:2.45V— LEDsnormal
2.35V— LEDspulse
onandoff
sws
DEPTH-OF-FIELD
PREVIEWLEVER
LEFT-
HAND
CRYSTAL
AB
APERTURE-
VOLTAGE
TP
MAINSWITCH
SHUTTER-
SPEED
PCBOARD
c
WIND-COMPLETION
SWITCH
D
A/MCONTACT
MECHANICAL
RELEASE
WINDING-GUIDE
PLATEASSEMBLY
0-C102
E
TRANSPORT
LATCH0-C108
SHUTTER-
CHARGE
LEVER
RATCHET
WHEEL
0-C106
FIGURE2
FIGURE1

Resistance,aperture-valueresistor:
5.9K± 10ohmsatf/8
Releasepoint.1stcurtain:The1stcur-
tainshouldreleasewhenthemirroris
I- 3mmfromtheporous-plasticstrip
atthetopfrontofthemirrorbox.
Timing,sprockethook:Theclearance
betweentheedgeofthemirror-charge
leverandthesprockethookshouldbe
0- 0.2mmwiththewindleverheld
fullyadvanced.Fig.I 3.
Wind-completionswitch,spacegap:
0.2- 0.4mm
Releasemagnet:Thespacegap
betweentherelease-magnetarmature
andthereleaselevershouldbe0.1-
0.3mm,Fig.5.Adjustbyshiftingthe
releasemagnet.
Countergear:Whenthecounter-
actuatorleverisparalleltotheendsof
thecamerabody,thepie-shapedopen-
inginthecountergearshouldfacethe
rewindendofthebody.Fig.15.
Sprocket:Turnthesprockettoward
thefilmaperturetotakeuptheback-
lash.Thesprocketshouldthenbe
withintherangeshowninFig.14—
onepairofteethpointingdirectlyto
thebackofthecameraorwithin30
degreestowardthetake-upspoolside.
ADJUSTMENTPROCEDURES
1.Aperture-controlvoltage
a.Connecta hook-upwiretothe
aperture-voltageTP,Fig.1.
b.Connectanoscilloscope
betweenthehook-upwireand
ground.
c.Setthelensto"A."
d.Setthescopeto2mssweep
time.20mvverticaldeflection.
10:1ontheprobe.
e.Releasetheshutterwhile
observingthediaphragmopening.
Makesurethediaphragmstops
downsmallerthanf/2.8.Ifnot,
increasethelightleveltogeta
smalleraperture.
f.Releasetheshutterwhile
observingthescopetrace.Note
thepeak-to-peakvalueofthesine
waveAdjustA,
Fig.I.fora valueof500 ±
lOOmv(turnthewiperclockwise
fora highervoltage).
Exposure
a.Settheprogrammode(lensat
"A,"shutterspeedatanysetting).
b.CheckatEV12(ISO100).The
aperture/shutter-speedcombina-
LEDFLEX
CONNECTOR
sws
SWH
FIGURE3
HOT-SHOE
CONTACTAPERTURERELEASE
PIECESCAPACITORCAPACITOR
3.
tionsouldbef/4and1/250.
c.AdjustB , Fig.1,for0 EV
errororfora shutterspeedof
3.9ms.Tolerance— 3.5- 4.3ms.
Turnthewipercounterclockwise
fora longerexposure,clockwise
fora shorterexposure.
d.CheckatEV8.The
aperture/shutter-speedcombina-
tionshouldbe1/60atf/2.
Shutter-speedtolerance— 12.2
-19.9ms.
e.CheckatEV16.EVI0,and
EV6.Theexposureshouldbe
within± 1.0EVateachlightlevel.
Aperture-value(f-value)resistor
a.Unsolderthetwoyellowwires
4.
oftheaperture-valueresistorfrom
theflexPCboardT100,Fig.21.
Connectanohmmeterbetween
thetwowires.
b.Setthelenstof/8.Theresist-
anceshouldbe5.9K+ 10ohms.
c.Toadjust,removethefront-
plate/mirror-boxassembly.Then
adjustthevariableresistoratthe
windsideofthefrontplate.
Shutter(1stcurtain)release
a.Holdthebottomedgeofthe
mirrorandpushtherelease
button.Or,ifpowerisn'tbeing
suppliedtothecircuit,mechani-
callyreleasethemirrorthrough
thecutoutshowninFig.2 (push
thearmatureoftherelease
GROUND
FIGURE4

magnettowardthefrontofthe
camera).
b.Allowthemirrortomoveup
slowlyandnotethemirrorposi-
tionwhentheshutterreleases.
Thedistancebetweenthemirror
andtheporous-plasticlighttrap
atthetopofthemirrorbox
shouldbe1 - 3mm.
c.Ifthedistanceisn'tcorrect.
removethemirrorboxandbend
thelongarmoftheshutter-release
lever.Bendupthearmtomake
theshutterreleasesooner(dis-
tancebetweenthemirrorandthe
lighttraptoosmall).Benddown
thearmtomaketheshutter
releaselater.
OPERATINGINSTRUCTIONS
1.Pushforwardthemain-switch
knob(top,rewindend)tooperate
camera.Intheonposition,the
main-switchknobuncovers"I"
ona redbackground.Withthe
mainswitchintheoffposition,
theshutterwon'treleaseandthe
LEDswon'tturnon.
2.ThefinderLEDsturnonwhen
youpushthereleasebuttonpart
way.TheLEDsremainon10
secondsafteryouletupthe
releasebuttonorafterthe
exposure.
3.Forprogramoperation,setthe
lensto"A"(auto).Thesettingof
thespeedknobmakesnodiffer-
ence.Withthelensatauto,the
"P"(program)LEDturnsonat
thetopofthedisplaywhenyou
pushthereleasebuttonpartway.
TheLEDdisplayalsoshowsthe
shutterspeedthatwillbeauto-
maticallydelivered.Ifthelight
conditionsrequirea shutterspeed
fasterthan1/1000.the"1000"
LEDflickers.Ifthelightcondi-
tionsrequirea shutterspeed
slowerthan1 second,theM"
LEDflickers.
4.Formeteredmanualoperation,
setthelenstoa manualf/stop.
Thesettingofthespeedknob
nowdeterminestheshutterspeed.
Ared"M"turnsonatthetopof
theLEDdisplaytoindicateman-
ualmode.Theshutter-speedLED
thatglowssteadilyindicatesthe
settingyou'veselected.Theflick-
eringLEDindicatesthespeed
youshouldselectforproper
exposure.
5.Atthebulbsetting(manual
f/stop),noneoftheLEDsturn
IC2
LEODRIVER
FIGURE6
on.Attheflash-speedsetting
(I/100).onlythe"M"LEDturns
on.
Forself-timeroperation,hold
downthebuttontothefrontof
themain-switchknob.Thenpush
themain-switchknobfullyfor-
ward.Themain-switchknobnow
uncovers"S.T."ona redback-
ground.Whenyoudepressthe
releasebutton,theself-timer
delaysthemirrorreleasefor12
seconds.TheselfLED(front,
release-buttonside)flickersdur-
ingthedelay.Thefrequencyof
theLEDoscillatorincreasesjust
beforetherelease.Iftheshutteris
settobulbandthelensissettoa
manualf/stop,theself-timer
won'toperate(noactionwhen
youdepressthereleasebutton).
7.TheDXcodingonthefilmcar-
tridgeautomaticallysetsthefilm
speed.There'snomanualfilm-
speedcontrol.Withnofilm— or
withanuncodedcartridge— the
film-speedsettingisISO100.
8.Thedepth-of-fieldpreviewlever
isatthefrontofthecamera,
release-buttonside.Fig.1.
9.The"ML"(memory-lock)button
(front,rewindsideoflensmount)
providestheauto-exposurelock
onprogrammode.Inthefirst
versionofthecircuit,youmust
keepthememory-lockbutton
depressedtolocktheexposure.In
therevisedcircuit,youdon'thave
RELEASE
MAGNET
S100
RELEASE
LEVER
FIGURE5
MIRROR-
CHARGE
LEVER
IC1
CPU
I

toholdinthememory-lockbut-
ton.Depressingthememory-lock
buttonturnsontheLEDsand
lockstheexposurefor10seconds.
Duringthememoryhold,the"P"
LEDandtheshutter-speedLED
flicker.Onmanualmode,the
memory-lockbuttonhasnofunc-
tion.Ifyoudepressthememory-
lockbuttononmanualmode,the
"M"LEDandtheshutter-speed
LEDflicker.However,theopera-
tionisn'taffected.
10.Thecurrentversionofthecamera
hasa cable-releasesocketatthe
front,rewindsideofthelens
mount.Shortingacrossthecable-
releasesocketreleasesthemirror.
11.ThefinderLEDsprovidethelow-
batterywarning.IftheLEDs
flashonandoff,thebatteriesare
gettinglow.Ifthebatteriesare
toolowforproperoperation,the
LEDswon'tturnonandtheshut-
terwon'trelease.
12.Thecameraprovidesautomatic
flashcontrolwithanyPentax
dedicatedunit.Inthemanual
mode,theflashsetstheshutter
speedto1/100iftheshutterisset
to1 /125orfaster.Whenthe
flashcharges,a lightning-flash
LEDturnsoninthefinderalong
with"M."Theshutter-speed
LEDsturnout.Ifyousetthe
shutterto1 /60orslower,the
shutterdeliverstheselectedshut-
terspeed.Thelightning-flash
LED,the"M"LED.andthe
shutter-speedLEDnotingtheset-
tingturnonwhentheflash
charges.Intheprogrammode,
theflashsetsboththeshutter
speedandtheaperture.Whenthe
flashcharges,the"M"LEDand
thelightning-flashLEDturnon.
Theshutterdelivers1/100.
SWITCHLOCATIONSAND
FUNCTIONS
1.Mainswitch.Slidingswitch,lop
rewindend.Fig.I.Intheonposi-
tion.Fig.17,themainswitch
connectsbatteryvoltagetoPC
boardTI00.Withthemain
switchintheoffposition,the
shutterwon'treleaseandthe
LEDswon'tturnon.
2.Self-timerswitch.Onmain-
switchblock.Fig.I 7.Slidingthe
mainswitchallthewayforward
connectsbatterypowertothe
circuitandclosestheself-timer
switch.IC1thendelaysthe
SHUTTER-SPEED
BASEPLATEWINDING SEAT
0-C2
FIGURE7
TRANSPORT-
LATCHSPRING
RETURN
SPRING
C137SPROCKETHOOK
FIGURE8S
4.
mirror-releasesignalfor12
seconds.
SWS.Light-measuringswitch.
Topcontactonshutter-speedPC
board,tig.I.Pushingtherelease
buttonpartwaymovestheSWS
contactagainstthecenterground
contact.TheLEDsturnon.
SWR.Releaseswitch.Bottom
contactonshutter-speedPC
board.Fig.I.Fullydepressingthe
releasebuttonmovesthecenter
groundcontactagainstthe
release-switchcontact.lCIthen
suppliesthereleasesignaltoIC2.
Timingswitch.Inshutterblock,
Fig.21.Thetimingswitchis
closedwiththeshuttercocked,
enablingtherelease.Whenthe
1stcurtainstartstorun.the
timingswitchopenstostartthe
timingcycle.
Wind-completionswitch.Bottom
ofcamera,windside.Fig.2.
Duringthecockingcycle,the
wind-completionswitchclosesto
inhibittheshutterrelease.The
wind-completionswitchopens
withtheshutterfullycockedto
enabletherelease.
COUNTER-
DIAL
RETAINER
NUT
RLEVER
C105

7.Memory-lockswitch.Onfront
plate,rewindside.Closeswhen
youpushtheMLbutton.The
LEDsturnon.andtheautoexpo-
sureremainslockedfor10
seconds.
MAGNETLOCATIONSAND
FUNCTIONS
1.Releasemagnet.Hybridmagnet
atbottomofmirrorbox.Fig.5.
I'hi-releasemagnetseparates
whenthereleasecapacitor
dischargesthroughitscoilto
releasethemirror.
2.Aperturemagnet.Hybridmagnet
atwind-leversideoffrontplate.
Theaperturemagnetseparates
whentheaperturecapacitor
dischargesthroughitscoiltolatch
themovementoftheaperture-
controlleverandstopthe
diaphragm.
3.Shuttermagnet.Electromagnetin
shutterblock,Fig.21.Energized
whenthereleaseswitchclosesto
holdthe2ndcurtain.
BASICOPERATION
Note:Thecircuitoperationisnearly
thesameasthatintheSuperProgram
andProgramPlus.However,sincethe
P3usesanLEDdisplay,theclock
onlyturnsonwhenyoupushthe
releasebuttonpartway.
1.ThecircuitusestwoICsonthe
undersideofPCboardT100:
ICI.Timing/controlIConthe
rewindside.Fig.6.ICIhasthe
built-inoscillatorandsuppliesthe
clocksignal.
IC2.Interfaceanddecoder/driver
onthewindside.Fig.6.1C2
switchesthecontroltransistors
anddrivestheLEDs.
2.Turningonthemainswitch
suppliesbatteryvoltagetothecir-
cuit.Whenyoupushtherelease
buttonpartway,SWScloses.
NowICIsuppliestheclockand
SVsignalstoIC2.
3.IC2receivesthemodeandTV
informationasdigitalsignalsfrom
theshutter-speedPCboard.The
BVandAVsignalsareanalog
valuesinputtoIC2.WhenIC2
receivestheSWSandclocksig-
nals,itturnsontheLEDsaccord-
ingtothemodeandexposure
inputs.
4.Whenyoufullydepressthe
releasebutton,thereleaseswitch
SWRcloses.ICIthenchecksthe
timingswitchintheshutterblock.
Ifthetimingswitchisclosed—
andthewind-completionswitch
isopen— ICIsuppliesthe
releasesignaltoIC2.Iftheself-
timerswitchisclosed.ICI delays
thereleasesignalfor12seconds.
5.WhenIC2receivestherelease
signalfromICI,itturnsonthe
releasetransistor.Fig.16.The
releasecapacitor,Fig.3.dis-
chargesthroughthecoilofthe
releasemagnet.Therelease
magnetseparates,releasingthe
mirror.
6.Asthediaphragmcloses,the
7.
opticalencodersuppliesthefeed-
backsignaltoIC2.Thecount
fromtheopticalencoderiscom-
paredtothecountstoredinICI
memory.Whenthecountsare
equal.IC2stopsthediaphragm
byturningontheaperturetransis-
tor.Fig.16.Theaperturecapaci-
torthendischargesthroughthe
coiloftheaperturemagnet.The
aperturemagnetseparates,slop-
pingtheaperture-controllever
ClosingthereleaseswitchSWR
alsoenergizestheshuttermagnet
intheshutterblock.IC2turnson
theshuttertransistor,Fig.16,to
WIND
SHAFT
COUNTERGEARC87
COUNTER-
ACTUATOR
LEVER
C96
SILENT
SPRING
RESTITUTION
LEVERC19
FIGURE9
MAIN
GEAR
C30
FIGURE10

switchlowthebrownmagnet
lead.
8.Themirrormechanicallyreleases
theshutter.Asthefirstcurtain
runs,itopensthetimingswitchin
theshutterblock.ICInowstarts
timingtheexposure.Toendthe
exposure.IC'lcommandsIC'2to
shutofftheshuttermagnet.IC2
turnsofftheshuttertransistor.
Thebrownmagnetleadswitches
high,andtheshuttermagnet
releasesthesecondcurtain.
9.Asyoucocktheshutterforthe
nextexposure,thewind-
completionswitchcloses.The
wind-completionswitchclearsthe
countersinICIandinhibitsthe
shutterrelease.Withtheshutter
fullycocked,thewind-completion
switchopenstoenablethe
shutter-releasesignal.
DISASSEMBLYHIGHLIGHTS
Settingsfordisassembly:mainswitch
off.speedknobonflashsetting(100)
Locationsofleft-handthreads:wind-
leverscrew.Fig.I
Sequence:
1bottomcover(3screws)—
rewindbuttonandbatteriesloose
2.topcover
-wind-levercover(1screw,
underside)
-windlever(left-handscrew)
Note:Theearlystylewind-leverscrew
hasspannernotches.Thecurrentstyle.
Fig.4.isa crosspointscrew.The
wind-leverscrewhaslockingagenton
thethreads.Useacetoneortheheat
froma solderingirontosoftenthe
lockingagent.
-top-covernutaroundwindshaft
-rewindknob(screwatlop)-—
rewindshallloose
-5 top-coverscrews(the2 screwsat
thefrontofthecamerahavelong
shoulders)
-liftthetopcoverandunsolderthe
blackwirefromPCboardTI00and
thegraywirefromtheshutter-speed
PCboard.Fig.21.
3.removehandgripleather
4.removehandgrip(crosspoint
screwandlargeminus-headplug)
5.removerightandleftfrontleather
6.unsolder1 I wiresfromtopof
camera.Fig.21
-4 shutter-blockwires(white,
red.andbrownfromPCboard
T100.grayfromshutter-speedPC
board)
2NDGEARC31
FIGURE12
-5 DX-blockwiresfromPC
boardT100(pink,green,yellow,
brown,purple)
-wind-eompletion-swilchwire
fromPCboardT100(orange)
-battery-boxwirefromPChoard
T100 (red)
7.pullred,white,andbrown
shutter-blockwirestowind-lever
endofcamera(thewirespassto
thefrontofthepentaprism)
8.removescrewsholdingshutter-
speedPCboard(4screwsinearly
models.2 screwsinlatermodels)
9.remove2 screwsholdingmain
switch
10.cockshutter
11.remove2 uppermirror-box
screws(Ioneithersideof
eyelens)
12.remove4 front-platescrews
13.liftoutfronl-plaie/mirror-box
assembly
14.removeshutter-speedbaseplate.
Fig.7 (3screwsinearlymodels.
2screwsinlatermodels)
15.removeshutterblock(2screwsat
topofcurtainunit.1 blackzinc
screwatbackofaperture)
Reassemblyhighlights:
1.Beforeyoureplacethemirror
PAWL
FIGURE11
SPROCKET
GEARC33
SPOOL
GEAR

box,cocktheshutter.Themirror
boxshouldbereleasedwiththe
mirrordown.
2.Tochecktheassemblyafteryou
installthemirrorbox,advance
thewindlevertochargethemir-
ror.Releasethemirrorbypush-
ingtherelease-magnetarmature
towardthefrontofthecamera—
workthroughthecutoutatthe
bottomofthecamera.Fig.2.
3.Beforeinstallingthelopcover,
pushthemainswitchtoiheoff
position(towardthebackofthe
camera.Fig.I).Turntheshutter-
speedbrushfullyclockwise
(flash-speedsetting).
Sequencetoremoveflex(PCboard
T100):
Note:Themirrorboxdoesn'thaveto
beremoved.Ifthemirrorboxisstill
installed,removethescrewsholding
themainswitchandthescrewshold-
ingtheshutter-speedPCboard.
Removetheshutter-speedbaseplate.
Fig.7,toreachtheLEDdisplay.
1.removescrewandseparateLED
displayfrommirrorbox
2.unsolderallwiresfromflex
except3 wiresfromphotocell
board(2black.I red)
3.remove2 hot-shoecontactpieces.
Fig.3
4liftphotocellboardclearof
eyelensframe
5.removePCboardTIOO(heldby
double-sidedtapeoneachIC.
Fig.6)
Reassemblyhighlights:
Afteryoureplacetheflex,checkthe
alignmentoftheLEDdisplay.Ifthe
mirrorboxisinstalled,checkthe
alignmentbeforeyoureplacethe
shutler-speedbaseplate.Connecta
jumperbetweenthegroundlandon
theshutter-speedPCboardandthe
camerabody.Youcanthenturnon
IheLFDsbyclosingSWS.Ifthemir-
rorboxisremoved,youcanpower
thecircuitasdescribedin"Circuit
Tests."P3.Loosenthescrewandshift
theLEDdisplayforadjustment.
Sequencetodisassembletransport:
1.removewindlever
2.disconnectcounter-dialspring
fromcounter-retainernut.Fig.7
3.unscrewcounter-retainernut
4.removecounterdialtogetherwith
counter-dialspring
5.removewindingseat.Fig.7 (3
screws— thelongscrewgoesto
thebackofthecamera)
Note:Thewind-levershaft(click-cam
assembly)isloose.A springwasher
fitsovertheshaft(betweentheclick
camandIhewindingseat).
6.removescrewconnectingshutter-
chargelevertoratchet-wheel
post.Fig.2
7.disconnectshutter-chargelever
fromratchetwheel
8.removebrasscollarfromratchet-
wheelpost
Note:Thebrasscollarsitsshoulder
up.Theshutter-chargeleverthenfits
overtheshoulder.
9.removewinding-guideplate
assembly.Fig.2 (3screws—
shortscrewgoestofrontof
camera)
10.removescrewandliftasidewind-
completionswitch.Fig.2 (not
necessarytounsolderwire)
1I.removetransportlatch.Fig.2 (E-
clip— disconnectthespringfrom
thetransportlatch:Fig.8 shows
thelocationofthespring)
12.removeratchetwheel.Fig.2
(screwandwasher)
Note:Thereturnspringhooksagainst
theedgeoftheratchetwheel.Fig.2.
Asyouliftouttheratchetwheel,
allowthespringtounwind(partial
turn).Youcanleavethereturnspring
inthecamerabody.Fig.8:oneendof
thereturnspringfitsundera liponthe
post.
13.liftoutthewindshaft.Fig.9
Note:Themaingear.Fig.10,nor-
mallystayswiththewindshaft.
14.disconnectrestitution-leverspring.
Fig.9,frombodycasting
15.removerestitutionlever(screw,
spring,post,andlever)
16.disconnectspringofcounter-
actuatorlever.Fig.9.fromlabon
lopmechanismplate
17.removecounter-actuatorlever
(removescrew— loosespring
andwasherontopofcounter-
aciuatorlever)— thecounter
gearcannowbeseparatedfrom
thecounter-actuatorlever
18.removesilent(ratchet)spring.
Fig.9
19.removetopmechanismplate(3
screwscountersunkscrewgoes
atbackcorner,shoulderscrew
goestowardcenterofbody)
20.remove2ndgear.Fig.12(minus-
headscrew)
21.liftoutsprocketgear.Fig.12
22.liftoutspoolgear.Fig.12
Note:Toremovethesprocketortake-
upspool,removethebottom
mechanismplate.
Sequence:
1.removewhiteplasticsprocket
latch(Rlever).Fig.8 (E-clip,
spring)
2.unscrewnutabovesprockethook.
Fig.8
Note:Holdupthesprockethook
(sprocket-engagedposition).Alsohold
thesprocket.Thenusea 3mmbox
drivertounscrewthenut.
3.unscrewsprockethook
4.removebottommechanismplale
(3screws)
5.removetake-upspool(noteloose
plasticcapthatfitsoverlower
endofspool)
6.removesprocketshaft
Note:A pinonthesideofthe
sprocketshaftfitswithinthesprocket.
Holdthesprocketandturnthe
sprocketshaft.Whenthepinaligns
wilhthenotchatthebottomofthe
sprocket,youcanliftoutthesprocket
shaft.
7.removesprocket
Note:Thesprocketspring,sand-
wichedbytwowashers,sitsinsidethe
sprocket.Toremovethespring,take
offihesprocketkey(lowerendof
sprocket).
Reassemblyhighlights,bottom
mechanismplate:
1.Seatthetake-upspoolandihe
sprocketfromthebackofthe
camera.Thesprocketkey(insert
withnotch)facesthebottom.
2.Seatthesprocketshaft,passingits
pinintothenotchatthebottom
ofthesprocket.Holddownthe
sprocketshaftandturnita partial
turn.Thesprocketshaftthenstays
inplace.
3.Replacethebottommechanism
plate.
4.Screwonthesprockethook.
5.ReplacetheR lever(sprocket
latch).
6.Afteryoucompletethereassem-
blyofihetransport,adjustthe
positionofthesprockethook.
Holdthewindleverinthefully
advancedposition.Thenturnthe

sprockethooktoobtainthespace
showninFig.13.Holdupthe
sprockethook(sprocket-engaged
position)asyouscrewonthenut.
Don'ttightenthenutsomuch
thatitchangesthepositionofthe
sprockethook.Rather,after
screwingdownthenuiand
recheckingtheadjustment,lock
thenutwitha dabofcement.
Checkthesprocket-hookadjust-
mentthreetimestomakesurethe
spacegapiscorrect.
Reassemblyhighlights,geartimingfor
transport:
1.Seatthespoolgearwithitstwo
slotsoverthetwobrasstabs
insidethetopofthetake-up
spool.
2.Turntheupperendofthe
sprocketshaftuntilitstwoflat
sidesareparalleltotheendsof
thebodycasting.
3.Seatthesprocketgearwithits
timingmark(slotattop)ina 1
o'clockposition.Fig.12.
4.Replacethe2ndgearwithitstim-
ingpunchmark(lowergearsec-
tion)alignedwiththetiming
markonthesprocketgear.The
otherpunchmarkonthe2nd
gear(uppergearsection)now
pointstothespoolgear.Fig.12.
5.Positionthepawlontheunder-
sideofthetopmechanismplate
asshowninFig.11.
6.Seatthetopmechanismplateand
replacethescrews.Thenswing
thepawlclockwiseuntilit's
againstthe2ndgear.
7.Replacethesilentspring.Fig.9.
8.Seatthemaingearwithanyone
ofits3 punchmarksalignedwith
thepunchmarkonthe2ndgear.
Fig.10.
9.Seatthewindshaftasshownin
Fig.9.Holdasidethewind-shaft
pawluntilitseatsagainstthe
outeredgeofthemain-gearcam.
10.Scatthecounter-actuatorlever
withthecountergear.Fig.9.
Withthecounter-actuatorlever
paralleltotheendsofthebody
casting,thepie-shapedcutoutof
thecountergearshouldfacethe
rewindendofthebody.Fig.15.
Tochangethetiming,liftthe
counter-actuatorleverandturn
thecountergear.
11.Replacetherestitutionlever.Fig.
9,thewind-levershaft,andthe
windingseat.
12.Fromthebottomofthecamera,
turnthewindshaftfullycounter-
clockwisebeforereplacingthe
ratchetwheel.Hooktheupper
endofthereturnspringagainst
theedgeoftheratchetwheel.
Thenturntheratchetwheel
clockwiseasyouseatitoverthe
windshaft.
13.Seatthecounterdial.Turnthe
counterdialfullycounterclock-
wisetoitsstop.Screwonthe
counter-retainernut.
14.Hooktheupperendofthe
counter-dialspringtoa slotinthe
counter-retainingnut.Usea slot
that'saround90degreesfromthe
restingpositionofthespringend.
Cementtheupperendofthe
counter-dialspringtothecounter-
retainingnut.
REVISEDSECTIONS
1.Thecurrentversionofthecamera
hasa cable-releasesocket0-A162
(front,rewindside).A bluewire
connectsthecable-releasesocket
toPCboardTI00.Fig.21.Ifthe
camerahastheversionofPC
boardTI00showninFig.21—
butdoesn'thavethecable-release
socket— theblue-wirelandis
empty.Shortingacrossthecable-
releasesocket(orshortingthe
bluewiretoground)releasesthe
mirror.Toaddthecable-release
socket,thefrontplatewas
changed(threadedholeadded).
old-stylefrontplateA100
new-stylefrontplate—
A100-0I
2.WhenPentaxaddedthecable-
releasesocket,theyalsochanged
thefocusingscreen.Thenew-style
Fresnelhasa rectangularmicro-
prismfocusingaid:theoldstyle
hasa roundmicroprismaround
thesplit-imagefocusingaid.Both
stylesaresupplied.
old-styleFresnel—
24500-L2
new-styleFresnel—
25302-L2
3.TheLEDblockandthePCboard
TI00havebeenrevised.Inthe
originaldesign,theflex-connector
postsareontheLEDblock;the
threadedpostforthenutis
towardthebackofthecamera.In
thenewstyle,theflex-connector
postsareonPCboardT100;the
threadedpostforthenutis
towardthefrontofthecamera.
Fig.3.Thetwostyleswillnot
interchange(ifnecessary,replace
boththeLEDblockandPC
boardT100).Theold-styleLED
blockandtheold-stylePCboard
T100arenolongersupplied.
new-styleLEDblock—
0100-01
new-stylePCboard—
T100-01
Fig.19showsthewiringdiagram
fortheearlystylePCboard:Fig.
21showsthewiringforthenew
style.
4.TheCPUIContheundersideof
PCboardT00-01hasbeen
revisedtoimprovetheoperation
ofthememory-lockswitch(see,
"OperatingInstructions"— #9).
Youcanidentifythe1Cbythe
markings.Fig.16.
old-styleIC—
M5840A-158
new-styleIC—
M5840A-166
5.Thewind-leverscrewC139has
beenchangedtoa crosspoint
head(theoldstylehasspanner
notches)tomakeassemblyeasier.
Onlythenewstyleisnow
supplied.
6.Thenutholdingthesprocket
hook.Fig.8,hasbeenchangedto
makeassemblyeasier.Theold
stylehasspannernotches.You
canusea boxdriver(3.0mm)to
removethenewstyle.Fig.8.
Onlythenewstyleisnow
supplied.
TROUBLESHOOTING
Behaviorwithoutbatteries:shutter
won'trelease
Behaviorwithoutlens:onlymanual
mode
Typicalcurrentdraw:
-releasepushedpartway
(LEDson)— 7ma
-shutterheldopenonbulb
—30ma
Tipsfortroubleshootingwithout
disassembly:
1.Iftheshutterwon'treleaseand
there'snoLEDdisplay,tryturn-
ingthemainswitchoffandthen

0- 0.2mm
MIRROR-
CHARGE
LEVER
SPROCKET
HOOK
FIGURE13
FILM-
APERTURE
SIDETAKE-UPSPOOL
SIDE
FIGURE14
REWIND
ENDOF
CAMERA
PARALLELTO
ENDSOF
CAMERA
COUNTER
GEAR
FIGURE15

SYMBOLTP
LEDPCBOARD
FIGURE18
PURPLE(A150)
BROWN(A150)
GREEN(A150)
PINK(G100)
SKYBLUE(M11)
RED(S100)
PINK(I300)
BLACK(S100)
ORANGE(G100)
GRAY(G100)
YELLOW(0-K110)
T100
GRAY(0-A114)
PINK(M12)
FIGURE19

on.IftheLEDsnowturnon
whenyoupushthereleasebutton
partway— andturnoffwhen
youfullydepressthereleasebut-
ton— yettheshutterdoesn't
release,theproblemisprobably
thereleasemagnet.
2.Ifthecamerawon'tswitchto
programmodewiththelensat
"A,"tryshortingtheA/Mlens-
mountcontact,Fig.2,toground.
The"P"LEDshouldnowturn
onwhenyoupushtherelease
buttonpartway.Ifso,theprob-
lemisprobablypoorcontact
betweenthelensandthelens
mount.
Frequentlyrepairedsections:
Shuttercurtainsdamaged,causedby
theoperatorduringfilm-loading.
Replacetheshutterblock.
CIRCUITTESTS
1.Opticalencoder
Constructthetestcircuitshown
inFig.20.Youcanthencheck
theopticalencoderfromthelop
ofthecamera.Fig.21.Discon-
necttheskyblue(phototransis-
tor)andorange(LED)wiresof
theopticalencoder.Connectthe
wirestothetestresistorsas
showninFig.20.Pushinthe
depth-of-fieldpreviewleverto
rotatetheoptical-encoderdisc.As
thediscrotates,youshouldgeta
sine-wavesignalonthescope.If
not,eitherthephototransistoror
theLEDmaybedefective.
Replacethediaphragm-control
blockG100.
2.Dedicated-flashchangeover
a.Setthelenstoa manualf/stop.
b.Selecta shutterspeedbetween
1/1000and1/125.
c.Connect2.4Vtothepink-wire
hot-shoecontactpiece(+ ),Fig.
21.
d.Closethelight-meteringswitch.
Theflash-symbolLEDandthe
"M"LEDshouldturnon.
e.Selecta shutterspeedbetween
1/60and1/2.Whenyounow
applyvoltagetothehot-shoecon-
tactpieceandclosethelight-
meteringswitch,theshutter-speed
LED(aswellasthe"M"LED
andtheflash-symbolLED)
shouldturnon.
3.Circuit,mirrorboxremoved
a.Connecta jumperbetweenthe
groundcontactontheshutter-
speedPCboardandthefront
plate.
b.Connecta jumperbetweenthe
timing-switchlandonthePC
boardTI00,Fig.21.andthe
frontplate.
c.Connect3V betweenthebat-
terycontactonPCboardT100,
Fig.21,andthefrontplate.
d.CloseSWS,Fig.1.TheLED
displayshouldturnon(exceptat
thebulbsetting)andremainon
10secondsafterSWSopens.
Withnolens,youshouldgetthe
"M"LED,theshutter-speedLED
thatcorrespondstothesettingof
theshutter-speedbrush,andthe
meteringLED(theshutter-speed
LEDthatflickerstoindicatethe
properexposuresetting).With
thelensinstalledandsetto"A,"
youshouldgetthe"P"LEDand
themeteringshutter-speedLED.
e.Chargethemirrorbypushing
forwardthemirror-chargelever.
Fig.5.
f.ClosethereleaseswitchSWR.
Themirrorshouldreleaseand
movetotheraisedposition.The
LEDdisplayshouldturnoff.
g.TheLEDdisplayremainsoff,
evenafteryoureturnthemirror,
becauseofthejumperbetween
thetiming-switchlandand
ground.Momentarilydisconnect
thejumper.TheLEDsshould
thenturnonwhenyouclose
SWS.
4.PCboardT100,removed
a.Bridgethelandsofthemain
switch.Fig.17.
b.Connecthook-upwirestothe
V-bat(+)andgroundlands,Fig.
21.
c.Apply3Vbetweenthehook-up
wires.
d.CloseSWS.TheLEDsshould
turnonandremainonfor10
secondsafterSWSopens.The
"M"LEDandtheshutter-speed
LEDindicatingtheselectedshut-
terspeedshouldturnon.The
"1000"LEDshouldbeflickering.
e.ClosethereleaseswitchSWR.
TheLEDsshouldremainon,but
the"1000"LEDshouldstop
flickeringandglowsteadily.
f.ShorttheA/Mland(green
wire.Fig21)togroundandclose
SWS.The"P"LEDshouldturn
on.
g.Shortthetiming-switchland
(whitewire.Fig.21)toground
andcloseSWS.TheLEDsshould
turnon.Nowclosetherelease
switch.TheLEDsshouldturnoff.
5.LEDdisplay,removed
a.Checkusinga 2.8Vpower
supply.Connecta 300-ohmresis-
tortoonepower-supplyleadto
limitthecurrentthroughthe
LEDs.
b.Bytouchingthepositive
power-supplyleadtooneofthe
terminalslabeled"+"inFig.18,
andthentouchingthenegative
power-supplyleadtooneofthe
terminalslabeled"-"inFig.18,
youshouldbeabletoturnon
eachoftheLEDsindividually.
Thefollowingchartshowswhich
LEDshouldturnonforeach
combinationofpower-supply
connections:
-LEAD
3
3
3
3
2
2
2
2
1
1
1
symbol
symbol
symbol
+LEAD
4
S
6
7
4
5
6
7
4
5
6
6
5
7
LED
1
2
4
S
15
30
60
125
250
500
1000
P
M
flashsymbol
Troubleshootingstepsforspecific
problems:
I.Shutterwon'trelease,noLEDs
Batteryvoltagetocircuit
Checkfor3Vbetweenground
andtheredwires(+),Fig.21.No

BODY
GROUND
1.5 V
3302K
LEDTR
SCOPE
VERTICAL
INPUT
FIGURE20OPTICALENCODERTESTCIRCUIT

voltage— batteryboxorwiring.
Mainswitch
Withthemainswitchintheon
position,checkfor3Vatthe
main-switchIP,Tig.17.Novol-
tagepoorcontactinthemain
switchorpoorsolderbetweenthe
main-switchflexandPCboard
T100.Fig.17.Orshortbetween
themain-switchconnections.Fig.
17.andcloseSWS.IftheLEDs
thenturnon,theproblemispoor
contactinthemainswitch.
Groundtoshutter-speedPC
board
Checkfora loosegroundscrew,
Fig.3.
Oscillator
CloseSWSandcheckforthesine
waveatcitherleadofthecrystal.
Fig.I.Nosignal— poorsolder
tocrystal,crystaldefective,or
1CIdefective.
Clock
CloseSWSandcheckforthe
clocksignalattheclockTP,Fig.
21.NosignalIC"I defective.
!.Shutterwon'trelease,LEDs
operate
ReleaseswitchSWR
CheckattheSWRTP.Fig.3.
TheTPshouldconnecttoground
withthereleaseswitchclosed.Or
shorttheSWRTPtoground.If
theshutterthenreleases,theprob-
lemispoorcontactintherelease
switchorpoorsolderbetweenthe
shutter-speedflex.Fig.16,and
PCboard1100.
Releasemagnet,releasecapacitor
CheckiftheLEDsturnoffwhen
youclosethereleaseswitchand
won'tagainturnonuntilyouturn
themainswitchoffandthenon.
Shorttheblackleadoftherelease
magnet,Fig.21,toground.Ifthe
shutterthenreleases,therelease
magnetandthereleasecapacitor
arco.k.Iftheshutterdoesn't
release,checkthereleasemagnet
betweentheredandblackleads.
Fig.21.Approximatecoilresist-
ance— 12ohms.Alsocheckfor
adirtyrelease-magnetinterface.
Youcancheckthereleasecapaci-
tor.Fig.3.bysubstitutinga 47
microfaradcapacitor.
Wind-completionswitch
Withtheshuttercocked,check
thevoltageattheorangewind-
completion-switchwire,Fig.21.
Thevoltageshouldbehigh.If
youmeasure0V,thewind-
completionswitchisn'topening
ortheorangewireispinched.
Timingswitch
Withtheshuttercocked,check
continuitybetweenthewhitewire
(rewindsideofPCboardTI00)
andground.Youshouldmeasure
directcontinuity.Ifnot,checkthe
limingswitch,Fig.21.forpoor
contact.
3.LEDswon'tturnonwhenyou
pushthereleasebuttonpartway,
butdoturnonwhenyourelease
theshutter
SWS
CheckbyshortingtheSWSTP.
Fig.21,toground.IftheLEDs
thenturnon,theproblemispoor
contactinSWS,Fig.1,orpoor
solderbetweentheshutter-speed
flexandPCboardT100,Fig.16.
4.Diaphragmalwaysstopsdown
fullyonprogrammode
Aperturemagnet,aperture-
magneicapacitor
Cocktheshutterandshortthe
grayleadoftheaperturemagnet.
Fig.21.toground.Youshould
heara clickastheaperture
magnetseparates.Whenyouthen
releasetheshutter,thediaphragm
shouldremainfullyopen.No
click— checktheaperture-
magnetcoilbetweenthegrayand
pinkwires.Fig.21.Approximate
coilresistance— 16ohms.You
canchecktheaperturecapacitor.
Fig.3.bysubstitutinga 47micro-
faradcapacitor.
Opticalencoder
See,"CircuitTests"— #1.
A/Mswitch
ChecktheLEDdisplaywiththe
lensat"A."Ifthe"P"LED
doesn'tturnon,theproblemmay
bepoorcontactbetweenthelens
andtheA/Mcontactatthefront
ofthelensmount.Checkthecir-
cuitbyshortingthegreenA/M
wire,Fig.21,toground.Ifthe
circuitiso.k..the"P"LEDwill
turnon.Stillno"P"LED— IC2
defective.
Note:Ifalltestschecko.k..butthe
diaphragmstillstopsdownfully,the
problemmavbeanopenaperture-
magnettransistorora defectiveIC2,
Fig.16.ReplacePCboardT100.
5.Shutterdeliversfastestspeedonly
Shuttermagnet
Shortthebrownshutterwire.Fig.
21,togroundandreleasethe
shutter.Theshuttershouldstay
open.Ifnot.theshuttermagnetis
openordirty.
PCboardT100
Checkatthebrownmagnetwire.
Fig.21,asyoureleasetheshutter.
Thebrownwireshouldswitch
lowwhenthereleaseswitch
closes.Ifnot.theshutter-magnet
transistororIC2maybedefec-
tive.Fig.16.
6.LEDalwaysshows"1000"
(flickering),diaphragmstops
downfullyonprogrammode
F-value(aperture)resistor
Checktheresistancebetweenthe
twoyellowwires.Fig.21.Atf/8.
youshouldmeasure5.9K.
OTHERCOMMENTS.PART
NUMBERS
1.Theflexcircuitissuppliedonlyas
acompleteunitincludingthe
photocellboard.New-styleflex
PCboardT100-01.
2.TheLEDblockissuppliedsepar-
ately-See."RevisedSections"#3.
3.Themain-switchblockissupplied
separately— 1200.
4.TheSeikoshutterblockissupp-
liedonlyasa completeunit—
O-E000."
5.Thespool-filmsheetbehindthe
take-upspoolisheldbydouble-
sidedtape.Ifyoudoremovethe
spool-filmsheet,it'sbesttoinstall
anewpartonreassembly.The
drawinghereshowstheposition
forinstallinga newspool-film
sheet.
0.1- 0.3mm
A63
0.2- 0.5mm
6.Otherpartnumbers:
-topcover— A300
-diaphragm-controlblock(aper-
turemagnet,opticalencoder)—
G100
-release-magnetblock— S100
Note:Partnumbersforthetransport
arcshownontheillustrations.
A64