[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-563046-105":59,"doc-detail-563046-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","ax-490-service-manual-adjustments","AX-490 - SERVICE MANUAL - Adjustments","","Service manual for the Yamaha AX-490 stereo integrated amplifier, providing service personnel guidance, critical component replacement notes, and safety-related checks after servicing. Includes leakage current measurement requirements for the 120 V model, rear panel layout references, and detailed audio and general specifications such as power output, input sensitivity/impedance, distortion, frequency response, and signal-to-noise. Also covers internal view references and numbered disassembly procedures for top cover, front panel, and rear panel.",{"@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/ax-490-service-manual-adjustments/563046/",{"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/ax-490-service-manual-adjustments/563046.png","ImageObject",300,407,{"name":92,"@type":93},"dabgoudw","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-14","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What special replacement requirement applies to critical components in the AX-490?","Question",{"text":112,"@type":113},"Components with special characteristics are marked with a symbol and must be replaced with parts having specifications equal to those originally installed.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What leakage current limit and test condition are required for the 120 V model?",{"text":117,"@type":113},"After service, exposed conductive surfaces must be properly insulated from supply circuits. Leakage current must not exceed 0.5 mA, and leakage must be tested with the AC plug in both polarities.",{"name":119,"@type":110,"acceptedAnswer":120},"How do you begin disassembly for the AX-490?",{"text":121,"@type":113},"Start by removing 8 screws (① to ③ in Fig. 1) and sliding the top cover back. Next remove screws for the front panel (④ and ⑤ in Fig. 2), then remove 12 screws for the rear panel (⑥ in Fig. 3).","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},563046,1791907994,{"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":81,"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":144,"read_time":145},3985747860484,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","■ CONTENTS  \nTO SERVICE PERSONNEL…………………………     ……1REAR PANEL ………  …  ………………    …  ………1SPECIFICATIONS…………………………………………………………3DIMENSIONS………   ……………………  ……………  …………….3INTERNAL VIEW….………………………………………4DISASSMBLY PROCEDURE….…   ……  …………4  \n# STEREO INTEGRATED AMPLIFIERAX-490\n\nSERVICE MANUAL  \nAX-490  \nADJUSTMENTS…………   …  …     ………    …5BLOCK DIAGRAM……  ……  …    ………………6PRINTED CIRCUIT BOARD….   …     …………8~11SCHEMATIC DIAGRAM………………………………………12,13PARTS LIST……  …                        14~21REMOTE CONTROL TRANSMITTER ……………………22  \n## ■TO SERVICE PERSONNEL\n\n### 1.Critical Components Information.\n\nComponents having special characteristics aremarked △and must be replaced with parts havingspecifications equal to those originally installed.  \n### 2.Leakage Current Measurement(For 120 V ModelOnly).\n\nWhen service has been completed.It is imperativethat you verify that all exposed conductive surfacesare properly insulated from supply circuits.  \n·Meter impedance should be equivalent to 1500 ohmsshunted by 0.15μF.  \n·Leakage current must not exceed 0.5 mA.  \n·Be sure to test for leakage with the AC plug in bothpolarities.  \nAX-490  \n■REAR PANELS  \n●U,Cmodels  \n●R model  \n1  \n■WARNING:CHEMICAL CONTENTNOTICE!  \nThe solder used in the production of this productcontainsLEAD.Inaddition,otherelectrical/electronicand/or plastic(where applicable)components mayalso contain traces of chemicals found by theCaliforniaHealthandWelfare Agency(andpossiblyother entities)to cause cancer and/or birth defectsor other reproductive harm.  \nDO NOT PLACE SOLDER.ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS INYOUR MOUTH FOR ANY REASON WHAT SOEVER!  \nAvoid prolonged,unprotected contact betweensolderand your skin!When soldering,do not inhalesolder fumes or expose eyes to solder/flux vapor!  \nIf you come in contact with solder or componentslocated inside the enclosure of this product,washyour hands before handling food.  \n●A model  \n●Bmodel  \n●Gmodel  \nAX-490  \n\n|  | ④  \u003Cbr>CE  \u003Cbr>⑤  \u003Cbr>③   |  |  |  | o  \u003Cbr>①   |\n| --- | --- | --- | --- | --- | --- |\n|  |  |  |  |  |  |\n\n\n|  |  | ②   | 2NAHA M  \u003Cbr>CVDLTa 8DwTe 8o  \u003Cbr>YMAHA CORPORANON  \u003Cbr>MMEL  \u003Cbr>VE78DU-D   |\n| --- | --- | --- | --- |\n|  |  | ◎  \u003Cbr>L   | ◎  \u003Cbr>◎  \u003Cbr>◎  \u003Cbr>◎  \u003Cbr>④  \u003Cbr>◎  \u003Cbr>◎  \u003Cbr>◎  \u003Cbr>◎  \u003Cbr>Aua   |\n\n\n| O  \u003Cbr>O  \u003Cbr>0  \u003Cbr>0   |\n| --- |\n\nAX-490  \n## ■SPECIFICATIONS\n\n■ AUDIO SECTION  \nMinimum RMS Output Power per Channel  \n8Ω, 20Hzto 20kHz,0.019% THD ………………………………………………85W  \n6Ω,20Hz to 20kHz,0.038% THD……………………………………………100W  \nDynamic Power per Channel (IHF)  \n8/6/4/2Ω…………………………………………………………………………130/150/185/220W  \nDIN Standard Output Power per Channel (G model)  \n1kHz,0.7% THD,4Ω……………………………………………………………………120W  \nIEC Power(G model)  \n1kHz,0.019% THD,8Ω………………………………………………………………100W  \nPower Band Width  \n8Ω,42.5W,0.038% THD…………………………………………10Hzto50kHz  \nDamping Factor (U, C,A,B,G models)  \n8Ω,20Hz to 20kHz……………………………………………………………240ormore  \nDamping Factor (DIN)  \n8Ω,40Hz to 12.5kHz …………………………………………………………120ormore  \nEIAJ Maximum Power (R model)  \n1kHz, 10% THD,89………………………………………………………………………130W  \n1kHz, 10% THD,6………………………………………………………………………150W  \nInput Sensitivity/lmpedance  \nPHONO MM……………………………………………………………………2.5mV/47kΩ  \nCD etc………………………………………………………………………………………150mV/47kS  \nMaximum Input Signal Level(1kHz,0.003% THD)  \nPHONO MM………………………………………………………………………………115mV  \nOutput Level/lmpedance  \nREC OUT………………………………………………………………………150mV/470Ω  \nHeadphone Jack Rated Output/lmpedance  \n0.019% THD, RL=8Ω………………………………………………………0.3V/680Ω  \nFrequency Response(20Hz to 20kHz)  \nCD etc…………………………………………………………………………………………………0±0.5dB  \nRIAA Equalization Deviation (20Hz to 20kHz)  \nPHONO MM……………………………………………………………………………0±0.3dB  \nTotal Harmonic Distortion (20Hz to 20kHz)  \nPHONO MM to REC OUT (3V)……………………………………………0.003%  \nCD etc. to SP OUT (42.5W/8Ω)……………………………………………0.008%  \nIntermodulation Distortion(8Ω)  \nCD etc…………………………………………………………………………………………………………0.01%  \nSignal-to-Noise Ratio(IHF-A Network)  \nPHONO MM(5mV Input Shorted)……………………………","cbCaicejJJct65Jg","https://ap.wps.com/l/cbCaicejJJct65Jg","pdf",16744601,22,"English","# TO SERVICE PERSONNEL\n## 1. Critical Components Information\n## 2. Leakage Current Measurement (For 120 V Model Only)\n# REAR PANELS\n# SPECIFICATIONS\n## AUDIO SECTION\n## GENERAL\n# INTERNAL VIEW\n# DISASSEMBLY PROCEDURES\n## 1. Removal of Top Cover\n## 2. Removal of Front Panel\n## 3. Removal of Rear Panel","[{\"question\":\"What special replacement requirement applies to critical components in the AX-490?\",\"answer\":\"Components with special characteristics are marked with a symbol and must be replaced with parts having specifications equal to those originally installed.\"},{\"question\":\"What leakage current limit and test condition are required for the 120 V model?\",\"answer\":\"After service, exposed conductive surfaces must be properly insulated from supply circuits. Leakage current must not exceed 0.5 mA, and leakage must be tested with the AC plug in both polarities.\"},{\"question\":\"How do you begin disassembly for the AX-490?\",\"answer\":\"Start by removing 8 screws (① to ③ in Fig. 1) and sliding the top cover back. Next remove screws for the front panel (④ and ⑤ in Fig. 2), then remove 12 screws for the rear panel (⑥ in Fig. 3).\"}]","AX-490 - SERVICE MANUAL - Adjustments | PDF",1791810407,55]