[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-560916-105":59,"doc-detail-560916-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","cp90110-chassis-service-tips-microprocessor-screening-plate-safety-test-after-repair","CP90/110 Chassis Service Tips - microprocessor screening plate - safety test after repair","","CP90/110 chassis service tips detailing production and repair changes across multiple subsystems, including microprocessor shielding to prevent external-field interference, selection differences in control ICs and tuner replacements, and correction of an incorrect Euroconnector code number. Guidance covers picture tube panel adjustments, loop system connection considerations for modern TVs, microprocessor screening-plate wiring direction, and page-header suppression for Ceefax/Fastext subtitle reception via teletext microcomputer reprogramming, plus safety testing after repair.",{"@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/cp90110-chassis-service-tips-microprocessor-screening-plate-safety-test-after-repair/560916/",{"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/cp90110-chassis-service-tips-microprocessor-screening-plate-safety-test-after-repair/560916.png","ImageObject",300,407,{"name":92,"@type":93},"Terk","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-24","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What production change was introduced for the control microprocessor in the CP90/110 chassis?","Question",{"text":112,"@type":113},"A shield was added to the main control microprocessor to prevent influence from external fields. Future replacements are supplied as a kit including the processor, shield, and fitting instruction, with the shield also available separately.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How should tuner replacement compatibility be handled between U743 and U943?",{"text":117,"@type":113},"U743 has been replaced by U943 and is a direct replacement in all applications. However, some chassis tuners are not reverse compatible: a U743 cannot replace a U943 without refitting components related to the +12V supply to pin 10 of the U743 tuner.",{"name":119,"@type":110,"acceptedAnswer":120},"What update suppresses the Ceefax page header during subtitle reception on Fastext receivers?",{"text":121,"@type":113},"The teletext microcomputer MAB8461P/W107 was reprogrammed to suppress the page header when subtitles are being received. The new version MAB8461P/W196 is available from service, and can be fitted as a drop-in replacement for specific complaints.","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},560916,1791858265,{"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":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":39,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":46},1099525198933,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Useful info  \n1. A production change:  \nA production change has been introduced adding a shield to the main control micro processor to prevent the processor being influenced by external fields In future, replacements will be supplied as a kit comprising the processor shield and fitting instruction. The shield will also be available separately.  \n:Old mask No. Code No. ``````````` ```````  \n:CP90/110 TMP47C432P :8188 209 72038 :8189 209 73665  \n:New mask No. Kit code No. `````````` ```````````  \n:8188 310 31849 :8188 310 31849 :8189 310 31851  \n:Shield only. ``````````  \n:Chassis Processor  \n:CP90 TMP47C432P  \n2. There are two types of micro used on this chassis.  \nFault 1 Fast text use part number 20987305, non fast text use part number 20911391.  \n3. U743 tuner replacement.  \nThe U743 UHF tuner has been replaced by the U943 . In all applications it is a direct replacement. Where the substitution was made during production some components, being no longer required, were deleted at the same time. This means that in some chassis the tuners are not reverse compatible ie. a U743 cannot be fitted in place of a U943 without first refitting components concerned with the +12V supply to pin 10 of the U743 tuner. The list of changes are as follows:  \n:Old Tuner New Tuner Deleted:U743-600 U943-600 None  \n:4822 210 50118 4822 210 10394.  \n5. Euroconnector code number.  \nNote: The code number for the euroconnector mentioned in the documentation is incorrect. The correct code number is: 4822 267 60243. Please change this in your documentation.  \n6. Picture tube panel adjustments.  \nNote: In the chassis documentation, chapter B; electrical instructions, picture tube adjustments, appears in line 6: \"black level on the picture tube base on 1304\". 1304 should be 130V. Add connection 7-IC7260 and remove earth.  \n7. Connection of a loop system to the TV.  \nNote: A problem usually occurs when connecting a loop system to a modern TV. A solution is available from the hearing aid suppliersin the form of a specific loop system amplifier which is supplied from the mains and which functions with a scart or phono plug signal. On the advice of a specialist a large part of the cost is usually covered by insurance.  \n8. Microprocessor screening plate.  \nNote: Connect the screening plate with the side ofR3726 which is pointing towards the front of the chassis.  \n9. Replacing control IC7840 .  \nFault 1: When replacing the control IC (IC7840) it is essential to ensure  \nthat the correct type is fitted. Type: TMP47C432AP-8187, TMP47C432AP-8188, standard teletext 4822 209 72038 or remote control only. TMP47C432AP-8189, FLOF (Fastext) or remote control only, 4822 209 87305  \nHA11484, CP90 Non remote 4822 209 83199. Note: FLOF (Full Level One Features) is a term frequently used in the service manual to describe a decoder equipped to handle Fastext commands.  \nA supplement CT88-11 giving information on the FLOF decoder, is available under service code no. 4822 727 16185.  \n10. New type stands.During production of CP90 and CP110 receivers the type of stand supplied was changed. In some cases this involved a new housing due to the need for different stand fixing centres. The models are listed and individual sets affected can be identified by the factory code on the type no. label.  \nModel  \n21CE1250/05B, 21CE1558/05B, 21CE1251/05B, 21CE1557/05B, 21CE1557/05Z, 52KE1510/05M, 52KE1512/05M, 52KE1585/05M, 24CE3271/05B, 24CE3588/05B 59KE3785/05M, 59KE3702/05M, 59KE3775/05M, 68KE3985/05M, 27CE3598/05B Note: These stands are supplied as a complete kit only. Individual parts will not be available.  \n11. Alternative 21\" picture tubes. During production of 21\" CP90 receivers, three different types of picture tube were used. In some cases this involved circuit changes. It is essential therefore that replacements should be of the same type. The various tube types together with component difference are listed on the following pages. This and other information are also contained in","cbCaikY0nm3NaXFP","https://ap.wps.com/l/cbCaikY0nm3NaXFP","pdf",60491,"English","# Production and component changes\n## Microprocessor shielding and screening-plate connection\n## Tuner and control IC replacements\n## Euroconnector code correction and picture tube adjustments\n## Loop system connection guidance\n## Teletext/Ceefax page-header suppression\n## Stand and picture tube replacement guidance\n## Safety test after repair","[{\"question\":\"What production change was introduced for the control microprocessor in the CP90/110 chassis?\",\"answer\":\"A shield was added to the main control microprocessor to prevent influence from external fields. Future replacements are supplied as a kit including the processor, shield, and fitting instruction, with the shield also available separately.\"},{\"question\":\"How should tuner replacement compatibility be handled between U743 and U943?\",\"answer\":\"U743 has been replaced by U943 and is a direct replacement in all applications. However, some chassis tuners are not reverse compatible: a U743 cannot replace a U943 without refitting components related to the +12V supply to pin 10 of the U743 tuner.\"},{\"question\":\"What update suppresses the Ceefax page header during subtitle reception on Fastext receivers?\",\"answer\":\"The teletext microcomputer MAB8461P/W107 was reprogrammed to suppress the page header when subtitles are being received. The new version MAB8461P/W196 is available from service, and can be fitted as a drop-in replacement for specific complaints.\"}]","CP90/110 Chassis Service Tips - microprocessor screening plate - safety test after repair | PDF",1791804471]