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Includes critical X-ray radiation precaution, safety precaution steps before and during chassis servicing, product safety notice guidance for replacement parts, and general adjustment procedures covering automatic degaussing, B+ adjustment, high voltage check, and focusing/test pattern setup.",{"@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":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/tv4k-nicama2txt-colour-television-receiver-service-manual/557824/",{"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/tv4k-nicama2txt-colour-television-receiver-service-manual/557824.png","ImageObject",300,407,{"name":92,"@type":93},"Himbo","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-22","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":34},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What are the key limits and checks for high voltage/X-ray radiation safety in this receiver?","Question",{"text":112,"@type":113},"The high voltage must be limited to a normal value of 26.5KV ±2KV under 230V AC, and must not exceed 29KV. Each servicing session should include a high voltage check using the HIGH VOLTAGE CHECK procedure and an accurate high voltage meter, with results recorded in the service record.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Why must the picture tube replacement match the exact same type, and what safety actions are required before handling it?",{"text":117,"@type":113},"The picture tube is the primary source of X-ray radiation; continued protection requires replacing the tube with exactly the same type as used in this receiver. Before handling, discharge the picture tube anode to the CRT conductive coating and use shatterproof goggles while keeping the tube away from unprotected body areas.",{"name":119,"@type":110,"acceptedAnswer":120},"How do you perform the B+ adjustment and what target voltage must be set?",{"text":121,"@type":113},"Confirm AC mains at 230V, 50Hz, switch on the TV and tune an active channel, set contrast/brightness/color to maximum, then measure the voltage between C641 on the main P.C. board. Adjust VR631 to set B+ to 140.0V ±1.0V.","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},557824,1791914433,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":34,"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},687197100911,"https://ap-avatar.wpscdn.com/avatar/a000239b6f1da00475?x-image-process=image/resize,m_fixed,w_180,h_180&k=1785132997149421697","TV4K-NICAM/A2/TXT  \nCOLOUR TELEVISION RECEIVER  \nSERVICE MANUAL  \nSPECIFICATION  \n! SYSTEM PAL/SECAM,B/G,I,NICAM/A2  \n! POWER INPUT AC 170-245V(50/60Hz)  \n! POWER CONSUMPTION 85W  \n! AERIAL IMPEDANCE 75OHM UNBALANCED  \n! TUNER VOLTAGE SYNTHESIZER TUNING  \n! RECEIVING CHANNELS VHF-LE2-S6  \nVHF-H S7-S41  \nUHF E21-E69  \n! PROGRAMME MAX.99 PROGRAM MEMORIES  \n! PICTURE TUBE 25”,28”,110 °  \n! SOUND OUTPUT 3.0W X2  \n! SPEAKER 8W 8 OHM X2  \n! AV JACKS FULL SCART ×2  \nCAUTION: Before servicing the chassis, read the “Safely Precaution”.“X-Ray radiation Precaution” and “Product Safety Notice” in this manual.  \nX-RAY RADIATION PRECAUTION  \n1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To Avoid such hazards the high voltage must be specified limit. The normal value of the high voltage of this receiver is 26.5KV +/-2KV under 230V AC power source. The high voltage must not exceed 29KV.  \n2. Each time a receiver requires servicing the high voltage should be checked following the HIGH VOLTAGE CHECK procedure in this manual. It is recommended the reading of the high voltage be recorded as a part of the service record. It is important to use an accurate and reliable high voltage meter.  \n3. The primary source of X -RAY RADIATION in this TV receiver is the picture tube. For continued X-RAY RADIATION protection, the replacement tube must be exactly the same type tube as used in this TV receiver.  \n4. Some parts in this receiver have special safety-related characteristics for X-RAY RADIATION protection. For continued safety, parts replacement should be undertaken only after referring the PRODUCT SAFETY NOTICE below.  \nSAFETY PRECAUTION  \nWARNING: Service should not be attempted by anyone unfamiliar with the necessary Precautions on this receiver.  \nThe following are the necessary precautions to be observed before servicing this chassis.  \n1. Since the power supply circuit of this receiver is directly connected to the AC power line. An isolation transformer should be used during any dynamic service to avoid possible shock hazard.  \n2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shatterproof goggles and keep picture tube away from the unprotected body while handling.  \n3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as: nonmetallic control; knobs, insulating covers, shields, isolation resistor-capacitor, network, etc.  \n4. When replacing parts or circuit boards, disconnect the power cord.  \n5. When replacing a high voltage resistor (metal oxide resistor) on circuit hoard, keep the resistor APP. 10mm(1/2 in.) away from circuit board.  \n6. Connection wires must be kept away from components with high voltage or high temperature.  \n7. If any fuse in this TV receiver is blown, replace it with the FUSE specified in  \nthe chassis parts list.  \n8. The receiver is designed to operate with 230V(50Hz) AC mains.  \nPRODUCT SAFETY NOTICE  \nMany electrical and mechanical parts in this chassis have special safety-related characteristics are often passed unnoticed by a visual inspection and the X-RAY RADIATON protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage. The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock, fire, X-RAY RADIATION or other hazards.  \nGENERAL ADJUSTMENT  \nAUTOMATIC DEGAUSSING  \nAn automatic degaussing coil is attached around the picture tube, degaussing the tube properly in about one second after the set is switched on. If the receiver is moved or faced on a different direction, the power must be switched off at least 15 minutes in order that the automatic degaussing circuit operated properly. External degaussing is necessary if the automati","cbCaidfDbf3bb1KD","https://ap.wps.com/l/cbCaidfDbf3bb1KD","pdf",50928,"English","# X-RAY RADIATION PRECAUTION\n# SAFETY PRECAUTION\n# PRODUCT SAFETY NOTICE\n# GENERAL ADJUSTMENT\n## AUTOMATIC DEGAUSSING\n## B+ ADJUSTMENT\n## HIGH VOLTAGE CHECK\n## FOCUSING\n# SERVICE CONTROLLED FUNCTION","[{\"question\":\"What are the key limits and checks for high voltage/X-ray radiation safety in this receiver?\",\"answer\":\"The high voltage must be limited to a normal value of 26.5KV ±2KV under 230V AC, and must not exceed 29KV. Each servicing session should include a high voltage check using the HIGH VOLTAGE CHECK procedure and an accurate high voltage meter, with results recorded in the service record.\"},{\"question\":\"Why must the picture tube replacement match the exact same type, and what safety actions are required before handling it?\",\"answer\":\"The picture tube is the primary source of X-ray radiation; continued protection requires replacing the tube with exactly the same type as used in this receiver. Before handling, discharge the picture tube anode to the CRT conductive coating and use shatterproof goggles while keeping the tube away from unprotected body areas.\"},{\"question\":\"How do you perform the B+ adjustment and what target voltage must be set?\",\"answer\":\"Confirm AC mains at 230V, 50Hz, switch on the TV and tune an active channel, set contrast/brightness/color to maximum, then measure the voltage between C641 on the main P.C. board. Adjust VR631 to set B+ to 140.0V ±1.0V.\"}]","TV4K-NICAM/A2/TXT - COLOUR TELEVISION RECEIVER SERVICE MANUAL | PDF",1791798908]