Seiko 7B24 User manual

*Lengthadjustmentserviceformetallicbandsisavailableatthe
retailerfromwhomthewatchwaspurchasedorSEIKOCUSTOMER
SERVICECENTER.
Theservicemayalsobeavailableonachargeablebasisatother
retailers,however,someretailersmaynotundertaketheservice.
ThankyouverymuchforchoosingaSEIKOwatch.
ForproperandsafeuseofyourSEIKOwatch,
pleasereadcarefullytheinstructionsinthis
bookletbeforeusing.
Keepthismanualhandyforeasyreference.

82
1.AboutThisProduct
Handingcautions……………………… 84
Features ………………………………… 86
Displayandbuttonoperation ……… 88
HowtouseButtonB ………………… 90
Crown …………………………………… 91
2.BeforeUse
Beforeuse ……………………………… 92
Checkingthechargingstatus…… 92
Checkingthetimeanddate …… 93
3.
HowtoSettheTimeandDate(RadioSignalReception)
Settingthetimeanddatebyreceivingaradiosignal …94
Mechanismofradiosignalreception …94
Automaticreceptionandmanualreception … 95
Aboutreceptionconditions……… 96
Radiosignalreceptionrange：InJapan(JJY) …… 96
Radiosignalreceptionrange：InChina(BPC) … 97
Radiosignalreceptionrange:IntheUnitedStates(WWVB) …98
Toenablethewatchtoeasilyreceivearadiosignal …99
Environmentsinwhichitisdi󱐰culttoreceivearadiosignal  …100
Howtocheckthereceptionstatus  …102
Howtodisplaythereceptionresult  …102
4.
TimeZoneAdjustmentFunction(Selectingtransmittingstation)
Whatisthetimezoneadjustmentfunction?  …104
Featuresoftimezoneadjustmentfunction  …104
Questionsandanswersregardingtimezoneadjustmentfunction  …105
Howtosetthetimezone(Selectingtransmittingstation)  …106
Listofmajortimezonesaroundtheworld  …108
Contents

83
1
2
3
4
5
6
7
8
5.SolarChargingFunction
Aboutcharging ………………………110
Howtochargethewatch ………110
Theindicationtimeforchargingthewatch  …111
Aboutenergy …………………………112
Energydepletionforewarningfunction  …112
Powersavefunction ………………113
6.
ToPreservetheQualityofYourWatch
Topreservethequalityofyourwatch  …114
Dailycare ……………………………114
Performanceandtype ……………115
Waterresistance …………………116
Magneticresistance ……………120
Band……………………………………122
Specialclasps ………………………124
Lumibrite ……………………………129
Powersource ………………………130
Guarantee ……………………………132
After-salesservice ………………134
7.Troubleshooting
Howtoconductmanualreception(Receivingaradiosignalmanually) …136
Conditionsinwhichthewatchmaybeunabletoreceiveradiosignals  …138
Howtomanuallysetthetime …138
Howtomanuallysetthedate …140
Preliminaryposition …………………142
Thingsaroundyouwhichgeneratemagnetism  …143
Howtosetthepreliminaryposition  …144
Settingthepreliminarypositionofthedate  …144
Settingthepreliminarypositionsofthehourandminutehandsmanually  …146
Troubleshooting ………………………148
Incaseofanabnormalmovement  …156
HowtoresettheBuilt-inICsystem  …156
8.Specications
Specications …………………………162

・ Keepthewatchandaccessoriesoutofthereachofbabiesandchildren.

Careshouldbetakentopreventababyorachildaccidentallyswallowingtheaccessories.
 Ifababyorchildswallowsthebatteryoraccessories,immediatelyconsultadoctor,asitwillbeharmfultothehealthofthebabyorchild.
WARNING
・Immediatelystopwearingthewatchinfollowingcases.
 ○ Ifthewatchbodyorbandbecomesedgedbycorrosionetc.
 ○ Ifthepinsprotrudefromtheband.
 ※ 
ImmediatelyconsulttheretailerfromwhomthewatchwaspurchasedorSEIKOCUSTOMERSERVICECENTER.
Toindicatetherisksofseriousconsequencessuchassevereinjuriesunlessthe
followingsafetyregulationsarestrictlyobserved.
※ ImmediatelyconsulttheretailerfromwhomthewatchwaspurchasedorSEIKOCUSTOMERSERVICECENTER.
Handlingcautions
84
AboutThisProduct

・Avoidthefollowingplacesforwearingorkeepingthewatch.
○ Placeswherevolatileagents（cosmeticssuchaspolishremover,bugrepellent,thinnersetc.）arevaporizing
○ Placeswherethetemperaturedropsbelow5℃orrisesabove35℃foralongtime  ○ Placesofhighhumidity
○
Placesa󱐯ectedbystrongmagnetismorstaticelectricity  ○ Dustyplaces
○ Placesa󱐯ectedbystrongvibrations
CAUTIONS
・Ifyouobserveanyallergicsymptomsorskinirritation

Stopwearingthewatchimmediatelyandconsultaspecialistsuchasadermatologistoranallergist
・Othercautions
 ○ Donotdisassembleortamperwiththewatch.
 ○ Keepthewatchoutofthereachofbabiesandchildren.

Extracareshouldbetakentoavoidrisksofanyinjuryorallergicrashoritchingthatmaybecausedwhentheytouchthewatch.
Toindicatetherisksoflightinjuriesormaterialdamagesunlessthefollowingsafety
regulationsarestrictlyobserved.
85
AboutThisProduct

86
AboutThisProduct
Features
Thissolar-driveandradio-controlledwatchisequippedwitharadiosignaladjustmentfunction.
・ Thewatchisoperatedbyusing“electricenergy”whichisconvertedfromthelightreceivedbythesolarpanel.
・ Thiswatchdisplaystheprecisetimebyreceivingradiosignalsconveyingtimeinformation.Itcanreceiveo󱐰cialstandardfrequencies
fromJapan(fromeitheroftwotransmittingstations),thePeople'sRepublicofChina,andtheUnitedStatesofAmerica.
■ RadioSignalReceivingFunction･････････････････････････ Thiswatchadjuststhetimeandthedatepreciselybyautomatically
receivingradiosignalsdaily.
   Inaddition,radiosignalscanbeforciblyreceivedwithmanual
operation.
   Thiswatchcanreceiveofficialstandardradiosignals fromJapan
(from2transmittingstations),China,andtheUnitedStates(the
transmittingstationforreceivingradiosignalscanbeselectedusing
thetimezoneadjustmentfunction).
■ DisplayFunctionofRadioSignalReceptionLevel･･･････ Themovementofthesecondhandindicatestheradiosignal
receptionlevelduringradiosignalreceptionattempts.
■ DisplayFunctionofRadioSignalReceptionResults･････ Themovementofthesecondhandindicatesradiosignalreception
results(Yes/No).
→ pages94–101
→ page137
→ page102

87
AboutThisProduct
■ TimeZoneAdjustmentFunction …
(SelectingTransmittingStation)
→ pages104-109
■ SolarChargingFunction …
→pages110-111
■ EnergyDepletionForewarningFunction …
→ page112
■ PowerSaveFunction…
→ page113
■ AutomaticHandPositionAlignmentFunction …
→page142
Thiswatchcandisplaylocaltimearoundtheworldby
settingtheappropriatetimezone.Inaddition,setting
thetimezoneenablesthewatchtoreceiveofficial
standard radio signals to set the time if the watch is
worninaradiosignalreceptionrange.
Asolarcellunderneaththedialconvertsanyform
oflightintoelectricalenergytochargeit.Oncefully
charged,thewatchcontinuestorunforapproximately
sixmonths.
Themovementofthesecondhandindicatesthatthe
batteryshouldbecharged.
Thiswatchisequippedwithafunctionwhichcan
suppressenergyconsumptionwhenitisleftwithout
receivinganadequatelightsourceforacertainlength
oftime.
Whenthehandpositionsdisplayanincorrecttimeas
aresultofexternalinfluencessuchasmagnetism,the
watchautomaticallycorrectsthehandmisalignment.

【Receptionresultconrmation】→ page102
【Manualreception】→ page136
【Timezoneadjustment】→ page106
【Manualtimeanddatesetting】→ page138
Firstclick【Manualdatesettingmode】→ page140
Secondclick【Manualtimesettingmode】→ page138
【Timezoneadjustmentmode(setting
thetimetoalocaltimeabroad)】→ page106
ButtonB
Crown
ButtonA
Minutehand
Hourhand
Secondhand
Date
Displayandbuttonoperation
88
012 ※Incase ofascrewlock typecrown,when
thecrownisunlocked,itisatthe0-click
position.
AboutThisProduct

89
ReceptionResultDisplay
【Conrmationof
receptionresult】
Y･･･
ReceptionSuccessful
 （10secondposition）
N･･･ReceptionFailed

（20secondposition）
※ "Conrmreceptionresult"
refertopage102
ReceptionLevelDisplay
※"Aboutthereceptionlevel
display"refertopage137
※Positionsofabovedisplaysmaydi󱐯erdependingonthemodel.
AboutThisProduct
【automaticreceptionand
manualreception】
H･･･
Highreceptionlevel
 （50secondposition）
L･･･ Lowreceptionlevel
  （40secondposition）
N･･･ Unabletoreceive
radiosignals
 （20secondposition）

ButtonBisrecessedinthewatchcasetopreventaccidentalinput.
Typesofbuttonsdi󱐯erdependingonthedesignofthewatch
UpperhalfofButtonBiscovered. ButtonBiscoveredexceptthe
hollowinthemiddleofthebutton.
ButtonBisrecessedinthewatchcase.
ButtonBisrecessedinthewatchcase.
PressthelowerhalfofButton
B or press the hollow in the
middleofthebuttonusingan
objectwithalongtaperedtip.
Pressthehollowinthemiddle
of the button usingan object
withalingtaperedtip.
P re s s t h e ho l l o w usi n g a n
objectwithalongtaperedtip.
HowtouseButtonB
90
AboutThisProduct

91
Crown
Therearetwotypesofcrowns,anormalcrownandascrew-lockcrown.
Checkthecrownonyourwatch.
AboutThisProduct
Thecrown
turns.
The
crown
doesnot
turn.
Unlockthecrownbeforeoperatingit.
Pulloutthecrownandoperateit.
Turnthe
crown
clockwise.
※ Ifyourwatchhasascrew-lockcrown,thecrownscrewsintothewatchtopreventmalfunctionandincreasewaterresistance.
※Becarefulnottoscrewthecrowninbyforceasitmaydamagetheslotsofthecrown.
Normalcrown
Screw-locktypecrown
Afteroperating
thecrown,lockit.
Unscrew
Screw
Whilepressing
thecrown

Checkingthechargingstatus
1
Whenthemovementofthesecondhandshowsanenergydepletionstate,thebatteryrequirescharging.
Beforeuse
92
Thesecondhandmoves
atone-secondintervals.
Thesecondhandmoves
attwo-secondintervals.
Thesecondhandmoves
atve-secondintervals.
Thesecondhand
isstopped.
Thewatchis
su󱐰cientlycharged.
Theenergydepletion
forewarningfunctionis
activated. → page112
Thepowersavefunction
isactivated.→ page113
Thewatchcompletely
stopsoperating.
Asthechargedenergyisrunning
out,chargethebatteryfully.
Checkthemovementsofthesecondhand
afterreleasingthePowerSavemode
Asthechargedenergyisdepleted,
chargethebatteryfully.
※ Ifthesecondhanddoesnotmoveatone-secondintervalsevenafterfullychargingthebattery→AtTroubleonpage150
Howto
chargethe
battery→
page110
BeforeUse

Checkingthetimeanddate
2
※Thehandsofthiswatchcannotbemovedbyturningthecrown.Sowhen
adjustingthetime,refertothefollowingpagesregardingtheprocedures.
93
Whenthetimeand
datearecorrect
Whentheradio
signalcanbe
received
Usethewatch
withoutadjustment.
Whenthe
timeand
dateare
incorrect Whenaradio
signalcannot
bereceived
Settingthetimeanddate
byreceivingaradiosignal
→page94
Manuallysetthe
timeanddate
→pages138-141
Radiosignalreceptionrangeindication →pages96-98
Environmentsinwhichitisdi󱐰culttoreceivearadiosignal →page100
BeforeUse
Howtosetthetime
zone→page106
※ Whensetting
atimezonefor
regionsotherthan
Tokyo(Japan),
theradiosignal
receptionfunction
willnotwork.
※ Whenthewatchisnotdisplayingtheprecisetimeanddateevenaftersuccessfullyreceivingaradiosignal→Inthis
case,refertoMisalignmentofthetimeandhandsonpage152andMisalignmentofthedateon page154.

Theradio-controlledwatchdisplaystheprecisetimeanddatebyautomaticallyreceiving
andsynchronizingitselfwiththeradiosignalofano󱐰cialstandardfrequency.
Timesignaltransmittedbyastandardfrequencyisbasedonasuperaccurate"Cesium
AtomicClock"thatmayhavea1secondlossorgainperonehundredthousandyears.
■Mechanismofradiosignalreception
Cesium
AtomicClock
Radio-controlledwatch
Receiveradiosignals
throughtheantenna
insidethewatch
↓
Analyzetime
information
↓
Displaythecurrent
time,dateandday
O󱐰cialstandard
frequency
Settingthetimeanddatebyreceivingaradiosignal
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HowtoSettheTimeandDate(RadioSignalReception)
Transmitting
Station

※ Whensettingatimezoneforregionsotherthanradiosignalreceptionrange,theradiosignalreceptionfunctionwillnotwork.
 Checkthesettingofthetimezone→Howtosetthetimezone(Selectingtransmittingstation)onpages106-107
※ Radiosignalreceptionresultsdependonareceivingcondition.→Environmentsinwhichitisdi󱐰culttoreceivearadiosignalonpage100
※ Thiswatchisunabletoreceiveradiosignalsoutsideareceptionrange→Radiosignalreceptionrangeindicationonpages96-98
※ Whenthewatchisnotdisplayingtheprecisetimeanddateevenaftersuccessfullyreceivingaradiosignal → AtTrouble:Misalignmentofthe
timeandhandsonpage152,Misalignmentofthedateonpage154.
・ Manualreception

Whenthiswatchcannotautomaticallyreceivearadiosignalduetoadi󱐰cult
receivingenvironment,itispossibletoreceivethemarbitrarilyatanytime.
Howtoconductmanualreception→pages136-137
The antenna for receiving radio
signalsinsidethewatchisatthe
9o’clockposition.Turningthe
anten na towa rd th e ou ts ide of
the window enables the watch to
receiveradiosignalsmoreeasily.
Whenreceivingradiosignals,placethewatchina
placewhereitcaneasilyreceivearadiosignal.
・ Automaticreception

Thiswatchautomaticallyreceivesaradiosignalat2:00AM.
■Automaticreceptionandmanualreception
Thiswatchsetsthetimeanddatebyautomaticallyreceivingaradio
signalataxedtime.
※ Ifthewatchfailstoreceivereceivesaradiosignalat2:00AM,itwillattempttoreceivea
radiosignalat3:00AM.Ifitfailsagain,itwillattempttoreceivearadiosignalat4:00AM.
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HowtoSettheTimeandDate(RadioSignalReception)

Aboutreceptionconditions
96
Thereceptionrangefromeachtransmittingstationisapproximately
1,000km（1,000kmradiusofeachstation）.
Ohtakadoya-yama
transmittingstation
（40kHz）
Hagane-yama
transmitting
station（60kHz）
1,000km
1,000km
※ NICT：NationalInstituteofInformation
  andCommunicationsTechnology
※
Whetherthewatchsucceedsinreceivingradio
signalsornotdependsonthereceivingconditions.
 Referto"Environmentsinwhichitisdi󱐰cultto
receivearadiosignal"onpage100.
■Radiosignalreceptionrange:InJapan(JJY)
JJY isoperatedby theNational
InstituteofInformationand
CommunicationsTechnology（NICT）.
JJYis transmitted fromtwo stations
inJapan.EachstationtransmitsJJY
inadi󱐯erentfrequency.
Fukushima（Ohtakadoya-yama
transmittingstation:40KHz）
Kyushu（Hagane-yama transmitting
station:60KHz）
HowtoSettheTimeandDate(RadioSignalReception)

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HowtoSettheTimeandDate(RadioSignalReception)
BPCisoperatedbyNTSC.
ShangqiuNationalTimeService
Center
Frequency:68.5kHz
※ NTSC：NationalTimeServiceCenter
Thereceptionrangefromthetransmittingstationisapproximately1,500
km(1,500kmradiusofthetransmittingstation).
■Radiosignalreceptionrange:InChina(BPC)
1,500km
ShangqiuNational
TimeServiceCenter
Frequency:68.5kHz
※Thewatchmaybeabletoreceiveradio
signalsoutsideareceptionrangeifthe
receivingconditionsarefavorable.
※Thewatchmayfailtoreceiveradiosignals
dependingonthereceptionconditions
(weather,geographiclocations,radio
disturbancessuchastallbuildings,and
orientationofthewatch).
Environmentsinwhichitisdi󱐰cultto
receivearadiosignalonpage100.

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HowtoSettheTimeandDate(RadioSignalReception)
WWVBisoperatedbyNIST.
FortCollinstransmittingstation
Frequency:60KHz
※ NIST：NationalInstituteofStandardsand
 Technology
Thereceptionrangefromthetransmittingstationisapproximately1,500km(1,500km
radiusofFortCollinsradiostation).Therearefourtimezoneswithinthereceptionrange.
1,500km
FortCollins
transmittingstation
Frequency:60KHz
※Thewatchmaybeabletoreceiveradio
signalsoutsideareceptionrangeifthe
receivingconditionsarefavorable.
※Thewatchmayfailtoreceiveradiosignals
dependingonthereceptionconditions
(weather,geographiclocations,radio
disturbancessuchastallbuildings,and
orientationofthewatch).
Environmentsinwhichitisdi󱐰cultto
receivearadiosignalonpage100.
■Radiosignalreceptionrange:IntheUnitedStates(WWVB)

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HowtoSettheTimeandDate(RadioSignalReception)
Theantennaforreceivingradio
signalsinsidethewatchislocated
atthe9o'clockposition.
Turningtheantennatowardthe
windowenablesthewatchto
receiveradiosignalsmoreeasily.
Inordertosecureastableradiosignal
reception,keepthewatchstationary
withoutchangingthedirectionofthewatch
ortiltingitduringradiosignalreception.
■Toenablethewatchtoeasilyreceivearadiosignal
Placethewatchwhereitcan
receiveradiosignalsmore
easily,suchasbythewindow.

・Closetohome electrical
appliancessuchasTV's,
refrigeratorsorairconditioners
・ClosetoOAdevisessuch
asmobilephones,personal
computersorfaxmachines
・Closetosteeldesksor other
furnituremadeofmetal
・Inplacesgenerating
radiointerference,such
asconstructionsites
orplaceswithheavy
tra󱐰c.
・Closetooverheadpower
lines,TVstations,train
cables.
・Inside a building, between tall
buildings,underground.
・Insideavehicle,train,orairplane
Avoidputtingthewatch
in such places when it
receivesradiosignals.
■Environmentsinwhichitisdi󱐰culttoreceivearadiosignal
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HowtoSettheTimeandDate(RadioSignalReception)