[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-661774-105":59,"doc-detail-661774-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","bulova-accutron-quartztm-service-manual-for-stepping-motor-quartz-smq-series-242","BULOVA ACCUTRON QUARTZTM Service Manual for Stepping Motor Quartz (S.M.Q.) Series 242","","Service manual describing the electronic function and servicing procedures for the Bulova Accutron Quartz Series 242 stepping motor watch movement. It explains how a 1.55V “Bulova 242” battery powers the quartz crystal at 32,768 Hz, how that rate is divided to generate one-second pulses for the stepping motor, and how accuracy is adjusted using the trimmer capacitor regulator (up to about 8 seconds per day). It also covers ACCUSET operation, crown positions, frequency checking and adjustment, re-synchronization after power cell installation or servicing, and key mechanical/electrical test points.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/bulova-accutron-quartztm-service-manual-for-stepping-motor-quartz-smq-series-242/661774/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/bulova-accutron-quartztm-service-manual-for-stepping-motor-quartz-smq-series-242/661774.png","ImageObject",300,407,{"name":92,"@type":93},"Ophelia","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-28",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What generates the one-second signal for the stepping motor in the Series 242 movement?","Question",{"text":112,"@type":113},"The quartz crystal vibrates at 32,768 Hz, and an electronic divider circuit with 15 stages converts it into one pulse per second for the stepping motor in timekeeping mode.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is time accuracy adjusted if the quartz frequency is incorrect?",{"text":117,"@type":113},"The trimmer capacitor regulator inside the movement can be turned to make adjustments of up to about 8 seconds per day, based on the quartz frequency rate.",{"name":119,"@type":110,"acceptedAnswer":120},"When must the electronic ACCUSET circuit be re-synchronized?",{"text":121,"@type":113},"Re-synchronization is required after installing a power cell, servicing the movement, or if current is interrupted (for example, due to a loose contact screw).","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},661774,1793180166,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":41},7971461741311,"https://ap-avatar.wpscdn.com/avatar/74000253aff267980c6?x-image-process=image/resize,m_fixed,w_180,h_180&k=1779345379180704826","# BULOVA®ACCUTRON®QUARTZTM\n\nServiceManual forStepping MotorQuartz (S.M.Q.)Series 242  \nTable of Contents  \nPage  \nIntroduction to the Basic Electronic Function  \nof Bulova Accutron Quartz Series 242...........2Technical Data ................................3Tools and Equipment...........................3Crown Positions...............................4Power Cell....................................4Checking the Frequency(Rate)...................4Setting Instructions and Synchronizing ElectronicACCUSET⑧Circuit............................4Using the ACCUSET Corrector...................5Servicing.....................................5Cleaning and Lubrication....................5Lubricants.................................5Mechanical Check Points....................5Electrical Check Points......................5ACCUSET Contact Check....................5Second Hand...............................5Basic Test Procedure for S.M.Q.Series 242.......6-7Checking the Components......................8Removing the Components......................8Electronic Circuit...........................8Resonator (Quartz)Cannister with Nest........8Stepping Motor.............................8Model 2426.10.................................8Setting Instructions.........................8Parts Assembly Sequence for Series 242........8-9Parts List for Model 2421.10.....................9Parts List for Model 2422.10....................10Parts List for Model 2423.10....................10Parts List for Model 2426.10....................10Illustrated Parts List...........................11Notes....................................10-11  \n## BASIC ELECTRONIC FUNCTION OFACCUTRON QUARTZ SERIES 242\n\nRefer to Fig.1  \nThe Accutron Quartz Series 242 is powered by a 1.55volt“Bulova 242”battery.Voltage from the battery isintroduced into the electronic circuit,which thentransmits current to the Quartz Crystal circuit causingit to vibrate at 32,768 Hz(cycles per second).Theaccuracy of the watch is dependent on the frequency ofthe Quartz Crystal.If the Quartz frequency is incorrect,the TRIMMER capacitor regulator,within the movement,can be turned to make adjustments of up to 8 secondsper day.  \nThis Quartz frequency (rate)must then be convertedto one-second impulses before it can be used tomechanically drive the hands of the watch.This isaccomplished by means of an electronic divider circuitThe divider circuit,which contains 15 stages,receivesthe signal generated by the Quartz Crystal and dividesthis signal by two in each of the 15 stages.  \nThe 15th stage emits one pulse per second.Thedivider circuit divides the 32,768 Hz to 1 Hz(2¹⁵=32,768),which drives the stepping motor in thetimekeeping mode.The motor in turn drives the geartrain which is connected to the dial train causing thehands to turn.  \n## ACCUSET®Operation\n\nIn addition to the 15 stage divider,and othercircuits,there are also two independent counterACCUSET control logic circuits.These logic circuitsperform the resetting function for the ACCUSETfeature.Both are set to zero when the crown is out(see Fig.5,Pg.4,Position 3)and the ACCUSET buttonis pushed and released.When the stem is pushed in(Position 1 or 2)both circuits start to count continu-ously,one count per second up to 60,and then startover again.  \ntherefore the hands)to stopor double pulse in relation tothe error.This is the meansby which a timekeeping errorcan be corrected.Moredetailed instructions arefound on Pages 4 and 5.  \nBulova Accutron Quartz Series 242—Electronicmovement with quartz resonator,stepping motorid ACCUSET  \nFig.2  \nDiameter  \n26 mm.—11V2 ligne  \nThickness  \n4.55 mm—Caliber 2421.10  \n5.50 mm—Calibers 2422.10,2423.10,2426.10  \nQuartz Frequency  \n32,768 Hz(Cycles per second)  \nElectronic Circuit  \nC-MOS Integrated Circuit—one second signalincrements  \nStepping Motor  \nBipolar,12 steps per revolution  \nwer Cell  \nOne Silver Oxide Battery,1.55V.,\"Bulova 242\"  \nPower Consumption  \nMax.7.5 Microamperes(Normal Running)Max.3.0 Microamperes (Disconnect Po","cbCaii5kaSUKK8hM","https://ap.wps.com/l/cbCaii5kaSUKK8hM","pdf",7666546,12,"English","# Table of Contents\n## Introduction to the Basic Electronic Function of Bulova Accutron Quartz Series 242\n## ACCUSET®Operation\n## Checking the Frequency (Rate)\n## Adjusting the Frequency (Rate)\n## Setting Instructions and Synchronizing Electronic ACCUSET Circuit","[{\"question\":\"What generates the one-second signal for the stepping motor in the Series 242 movement?\",\"answer\":\"The quartz crystal vibrates at 32,768 Hz, and an electronic divider circuit with 15 stages converts it into one pulse per second for the stepping motor in timekeeping mode.\"},{\"question\":\"How is time accuracy adjusted if the quartz frequency is incorrect?\",\"answer\":\"The trimmer capacitor regulator inside the movement can be turned to make adjustments of up to about 8 seconds per day, based on the quartz frequency rate.\"},{\"question\":\"When must the electronic ACCUSET circuit be re-synchronized?\",\"answer\":\"Re-synchronization is required after installing a power cell, servicing the movement, or if current is interrupted (for example, due to a loose contact screw).\"}]","BULOVA ACCUTRON QUARTZTM Service Manual for Stepping Motor Quartz (S.M.Q.) Series 242 | PDF"]