Hitachi-HTADD3W-avr-sm维修电路原理图.pdf
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1、CAUTION: Beforeservicing this chassis, itisimportantthat the servicetechnician read the“Safety Precautions”and“ProductSafetyNotices”inthisservicemanual. ATTENTION: Avantdeffectuerlentretienduchassis,letechniciendoitlirelesPrcautionsdescurit etlesNoticesdescuritduproduitprsentsdansleprsentmanuel. VOR
2、SICHT: VorffnendesGehuseshatderService-IngenieurdieSicherheitshinweise“undHinweise zurProduktsicherheit“indiesemWartungshandbuchzulesen. SERVICE MANUAL MANUEL DENTRETIEN WARTUNGSHANDBUCH DatacontainedwithinthisService manualissubjecttoalterationfor improvement. Les donnes fournies dans le prsent man
3、ueldentretienpeuventfairelobjet demodificationsenvuedeperfectionner leproduit. DieindiesemWartungshandbuch enthaltenenSpezifikationenknnensich zwecksVerbesserungenndern. September 2000 AV SURROUND SYSTEM HTADD3E HTADD3EBS HTADD3W HTADD3WUN HTADD3WAU SM0103 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHA
4、NGE FOR IMPROVEMENT CONTENTS SPECIFICATIONS.3 SERVICE POINTS.4 WIRING DIAGRAM.9 PRINTED WIRING BOARD.10 SCHEMATIC DIAGRAM.25 EXPLODED VIEW.43 REPLACEMENT PARTS LIST.47 ADJUSTMENT.8 BLOCK DIAGRAM.23 RadioFans.CN 收音机爱 好者资料库 ENGLISH SAFETY PRECAUTIONS WARNING: The following precautions must be observed
5、. ALL PRODUCTS Before any service is performed on the chassis an isolation transformer should be inserted between the power line and the product. 1. When replacing the chassis in the cabinet, ensure all the protective devices are put back in place. 2. When service is required, observe the original l
6、ead dressing. Extra precaution should be taken to ensure correct lead dressing in any high voltage circuitry area. 3. Many electrical and mechanical parts in HITACHI products have special safety related characteristics. These characteristics are often not evident from visual inspection, nor can the
7、protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified by marking with a ? on the schematics and the replacement parts list. The use of a substitute r
8、eplacement component that does not have the same safety characteristics as the HITACHI recommended replacement one, shown in the parts list, may create electrical shock, fire, X-radiation, or other hazards. 4. Always replace original spacers and maintain lead lengths. Furthermore, where a short circ
9、uit has occurred, replace those components that indicate evidence of overheating. 5. Insulation resistance should not be less than 2M ohms at 500V DC between the main poles and any accessible metal parts. 6. No flashover or breakdown should occur during the dielectric strength test, applying 3kV AC
10、or 4.25kV DC for two seconds between the main poles and accessible metal parts. 7. Before returning a serviced product to the customer, the service technician must thoroughly test the unit to be certain that it is completely safe to operate without danger of electrical shock. The service technician
11、must make sure that no protective device built into the instrument by the manufacturer has become defective, or inadvertently damaged during servicing. CE MARK 1. HITACHI products may contain the CE mark on the rating plate indicating that the product contains parts that have been specifically appro
12、ved to provide electromagnetic compatibility to designated levels. 2. When replacing any part in this product, please use only the correct part itemised in the parts list to ensure this standard is maintained, and take care to replace lead dressing to its original state, as this can have a bearing o
13、n the electromagnetic radiation/immunity. PICTURE TUBE 1. The line output stage can develop voltages in excess of 25kV; if the E.H.T. cap is required to be removed, discharge the anode to chassis via a high value resistor, prior to its removal from the picture tube. 2. High voltage should always be
14、kept at the rated value of the chassis and no higher. Operating at higher voltages may cause a failure of the picture tube or high voltage supply, and also, under certain circumstances could produce X-radiation levels moderately in excess of design levels. The high voltage must not, under any circum
15、stances, exceed 29kV on the chassis (except for projection Televisions). 3. The primary source of X-radiation in the product is the picture tube. The picture tube utilised for the above mentioned function in this chassis is specially constructed to limit X-radiation. For continued X-radiation protec
16、tion, replace tube with the same type as the original HITACHI approved type 4. Keep the picture tube away from the body while handling. Do not install, remove, or handle the picture tube in any manner unless shatterproof goggles are worn. People not so equipped should be kept away while picture tube
17、s are handled LASERS If the product contains a laser avoid direct exposure to the beam when the cover is open or when interlocks are defeated or have failed. - 1 - RadioFans.CN 收音机爱 好者资料库 HTA-DD3 ? ? ? ? Checking method ? ? ? ?!?# ? ? ?$%? INSTRUMENT (Exposed part) Insulation tester (DC 500V) ? ?:?
18、Usablesensitivity:?8+?-?(*?08+?0?.?(*;?(*?!?1?%?2?%(? ? ?:? Power consumption:?+,(0=?$%?)?-#-?=?. ?$%?)? %0?%?)?:?%#G?%=?$ ?3;3HB;36H0=?$%?)?-#-?=?. ?$%?)? %0?%?)?:?%#G?%=?$ 6?+;+,($?)?%?G#? ?G?)? :?)?:?%#G?%=?$ ?3;3HB;36H$?)?%?G#? ?G?)? :?)?:?%#G?%=?$ A D J U S T M E N T S ?G? HTA-DD3 WIRING DIAGRA
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