Hitachi-HTADD3-asr-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 HTA-DD3E HTA-DD3EBS HTA-DD3W HTA-DD3WUN HTA-DD3WAU SM0103 SPECIFICATIONS AND PARTS ARE SUBJECT T
4、O CHANGE 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 ENGLISH SAFETY PRECAUTIONS WARNING: The following precautions must be observed. ALL
5、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 lead dr
6、essing. 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 protec
7、tion 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 replace
8、ment 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 circuit ha
9、s 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 or 4.2
10、5kV 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 must m
11、ake 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 approved to
12、 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 on the
13、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 kept a
14、t 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 circumstance
15、s, 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 protection,
16、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 tubes are
17、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 HTA-DD3 ? ? ? ? Checking method ? ? ? ?!?# ? ? ?$%? INSTRUMENT (Exposed part) Insulation tester (DC 500V) ? ?:? Usablesensitivity
18、:?8+?-?(*?08+?0?.?(*;?(*?!?1?%?2?%(? ? ?:? Power consumption:?+,(0=?$%?)?-#-?=?. ?$%?)? %0?%?)?:?%#G?%=?$ ?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 DIAGRAM FL DISPLAY UNIT
19、 CN2B CN1B CN1A CN1BCN2A W17A W15A W16A W18A W14A W19A W13A CN204 CN204A CN201A CN14 CN12 TUNER/VOL UNIT AUDIO IN. UNIT DIGITAL IN. UNIT VIDEO(C)IN. UNIT VIDEO(S)IN. UNIT MAIN UNIT CN22 PG22 PG13 CN205 THERMAL UNIT VIDEO(COMP.)IN. UNIT SPEAKER OUT. UNIT CN206 PG14 CN201 DSP UNIT PG205 PG206 W19B W18
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