Manual Seiko 1B21 (page 1 of 20) (English)

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※Lengthadjustmentserviceformetallicbandsisavailableat

theretailerfromwhomthewatchwaspurchased.Ifyoucannot

haveyourwatchrepairedbytheretailerfromwhomthewatch

waspurchasedbecauseyoureceivedthewatchasagift,oryou

movedtoadistantplace,pleasecontact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.

※Ifyourwatchhasaprotectiveﬁlmforpreventingscratches,make

suretopeelitoﬀbeforeusingthewatch.Ifthewatchisused

withtheﬁlmonit,dirt,sweat,dust,ormoisturemaybeattached

totheﬁlmandmaycauserust.

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it.

Keepthismanualhandyforeasyreference.

Contents

1.AboutthisProduct

Handlingcautions·································84

Beforeuse················································88

Features····················································90

Displayandbuttonoperation

···············92

Howtousethebutton························94

Crown·························································95

2.BeforeUse

Beforeuse················································96

Checkingthechargingstatus······96

Checkingthetime·····························97

3.

HowtoSettheTime(RadioSignalReception)

Settingthetimebyreceivingaradio

signal························································ 98

Mechanismofradiosignalreception

······98

Automaticreceptionandmanualreception

······99

Receptionenvironment····················100

Radiosignalreceptionrangeindication



···100

Radiosignalreceptionrange:Japan(JJY)



···101

Radiosignalreceptionrange:China(BPC)

···102



Radiosignalreceptionrange:U.S.A.(WWVB)

···103



Radiosignalreceptionrange:Germany(DCF77)

···104



Toimproveradiosignalreception

···105



Environmentsinwhichitisdiﬃcult

toreceivearadiosignal

····················106

Howtocheckthereceptionstatus

···108

Howtodisplaythereceptionresults

···108

4.SolarChargingFunction

Aboutcharging····································110

Howtochargethewatch············110

Standardchargingtime················111

Aboutenergy········································112



Energydepletionforewarningfunction

···112

Powersavefunction······················113

5.

Timediﬀerenceadjustment(whenusingthewatchoverseas)

Timediﬀerenceadjustment(when

usingthewatchoverseas)·············114



Featuresoftimediﬀerenceadjustment

function

···············································114



Questionsandanswersregardingtime

diﬀerenceadjustmentfunction

····115



Settingthetimediﬀerence(selectinga

radiosignaltransmittingstation)

··116

Listofmajortimediﬀerencesaroundtheworld

118

6.

ToPreservetheQualityofYourWatch

Dailycare···············································120

Performanceandtype······················121

Waterresistance································122

Magneticresistance·························124

Band························································126

Specialclasps·····································128

Lumibrite················································133

Powersource·······································134

After-salesservice·····························136

7.Troubleshooting



Howtoconductmanualreception

(receivingaradiosignalmanually)

···138

Whenaradiosignalcannotbereceived

···140

Howtomanuallysetthetime····141

Preliminaryposition···························144



Automatichandpositionadjustmentfunction

(adjustmentofpreliminarypositionsofhour,

minuteandsecondhands)

····················144

Attrouble···············································146

Incaseofanabnormalmovement

·154

Resettingthesystem···················154

8.Speciﬁcations

Speciﬁcations······································158

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Seiko 1B21 Manual

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