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Further sections cover electrical parts and main motor, shutter cover, power supply, insulation, switches, pin jack, motor subassembly, thread tension mechanisms, and thread units with associated guards and guides.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/bl40-bl40a-bl50a-service-manual/652641/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/bl40-bl40a-bl50a-service-manual/652641.png","ImageObject",300,407,{"name":42,"@type":43},"I feel Different","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-10-24",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",8,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What topics are covered in the mechanism outline section?","Question",{"text":63,"@type":64},"It covers main mechanisms, driveline, positions of electronic components, a control system block diagram, operation of other electronic components, and how to use the threader.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How does the manual structure the disassembly process?",{"text":68,"@type":64},"It provides a step-by-step removal and disassembly sequence for major parts and subassemblies, including covers, panels, electrical-related boards, and specified components.",{"name":70,"@type":61,"acceptedAnswer":71},"Does the manual include information about electrical parts and the main motor?",{"text":72,"@type":64},"Yes. The disassembly section includes a dedicated part on electrical parts and the main motor, followed by further removals and disassemblies of related assemblies.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},652641,1793063976,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,105,110,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":103,"slug":104},6,50,"technology",{"id":106,"doc_module":4,"doc_module_name":25,"category_name":107,"show_sort_weight":108,"slug":109},7,"Healthcare",40,"healthcare",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":102,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":139,"language":140,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":12,"update_tm":144,"read_time":145},962093541761,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","1 . Outline of Mechanism ........................................................................1-1  \nMain Mechanisms ...........................................................................1-2  \nDriveline ..........................................................................................1-3  \nPositions of electronic components ................................................1-4  \nControl system block diagram .........................................................1-5  \nOperation of other electronic components ......................................1-6  \nUsing the threader ..........................................................................1-7  \n2. Disassembly ........................................................................................2-1  \nMain parts ..........................................................................................................2-2  \nRemoval of Accessory table ..............................................................................................................2-3  \nDisassembly of Accessory table ....................................................................................................2-3  \nRemoval of Face plate assy...............................................................................................................2-3  \nDisassembly of Face plate assy.....................................................................................................2-3  \nRemoval of Needle plate B assy........................................................................................................2-4  \nDisassembly of Needle plate B assy.............................................................................................2-4  \nRemoval of Free arm cover ...............................................................................................................2-4  \nRemoval of Free arm plate .................................................................................................................2-5  \nRemoval of Base plate cover .............................................................................................................2-5  \nRemoval of Front cover assy.............................................................................................................2-6  \nDisassembly of Front cover assy. (Removal of LED lamp-R) .....................................................2-7  \nDisassembly of Front cover assy. (Removal of SSVR PCB assy. ) ..............................................2-7  \nDisassembly of Front cover assy. (Removal of Buttons) ..............................................................2-7  \nDisassembly of Front cover assy. (Removal of SV key top ) .......................................................2-8  \nRemoval of Selecting panel M assy...................................................................................................2-9  \nDisassembly of Selecting panel M assy. (Removal of Dial PCB assy. M1YM) ..........................2-9  \nDisassembly of Selecting panel M assy. (Removal of Operation PCB assy. M1YM) .................2-9  \nDisassembly of Selecting panel M assy. (Removal of Buttons) .................................................2-10  \nDisassembly of Selecting panel M assy. (Removal of Selecting dial M) ...................................2-10  \nDisassembly of Selecting panel M assy. (Removal of Single light guide assy.) ........................2-11  \nRemoval of Rear cover assy............................................................................................................2-11  \nDisassembly of Rear cover assy. (Removal of Bobbin presser) .................................................2-11  \nDisassembly of Rear cover assy. (Removal of Spool pin) ..........................................................2-12  \nDisassembly of Rear cover assy. (Removal of Thread guide supporting plate) .........................2-12  \nElectrical parts and main motor ...........................","cbCaii4LMiv90k4b","https://ap.wps.com/l/cbCaii4LMiv90k4b","pdf",9753038,209,"English","# Outline of Mechanism\n## Main Mechanisms\n## Driveline\n## Positions of electronic components\n## Control system block diagram\n## Operation of other electronic components\n## Using the threader\n# Disassembly\n## Main parts\n## Removal of Accessory table\n## Disassembly of Face plate assy\n## Removal of Needle plate B assy\n## Removal of Free arm cover\n## Removal of Base plate cover\n## Removal of Front cover assy\n## Disassembly of Front cover assy (Removal of LED lamp-R)\n## Disassembly of Front cover assy (Removal of SSVR PCB assy)\n## Disassembly of Front cover assy (Removal of Buttons)\n## Disassembly of Front cover assy (Removal of SV key top)\n## Removal of Selecting panel M assy","[{\"question\":\"What topics are covered in the mechanism outline section?\",\"answer\":\"It covers main mechanisms, driveline, positions of electronic components, a control system block diagram, operation of other electronic components, and how to use the threader.\"},{\"question\":\"How does the manual structure the disassembly process?\",\"answer\":\"It provides a step-by-step removal and disassembly sequence for major parts and subassemblies, including covers, panels, electrical-related boards, and specified components.\"},{\"question\":\"Does the manual include information about electrical parts and the main motor?\",\"answer\":\"Yes. The disassembly section includes a dedicated part on electrical parts and the main motor, followed by further removals and disassemblies of related assemblies.\"}]","BL40-BL40A-BL50A Service Manual | PDF",1792881484,527]