Hitachi-HTADD1-asr-sm 维修电路原理图.pdf

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1、CAUTION:Before servicing this chassis, it is important that the service technician read the “Safety Precautions” and “Product Safety Notices” in this service manual.ATTENTION:Avant deffectuer lentretien du chassis, le technicien doit lire les Prcautions de scurit et les Notices de scurit du produit

2、prsents dans le prsent manuel.VORSICHT:Vor ffnen des Gehuses hat der Service-Ingenieur die Sicherheitshinweise“ und Hinweise zur Produktsicherheit“ in diesem Wartungshandbuch zu lesen.SERVICE MANUALMANUEL DENTRETIENWARTUNGSHANDBUCHData contained within this Service manual is subject to alteration fo

3、r improvement.Les donnes fournies dans le prsent manuel dentretien peuvent faire lobjet de modifications en vue de perfectionner le produit.Die in diesem Wartungshandbuch enthaltenen Spezifikationen knnen sich zwecks Verbesserungen ndern.September 2000AV SURROUND RECEIVERHTA-DD1EHTA-DD1EBSHTA-DD1WHT

4、A-DD1WUNSM0102SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENTCONTENTSSPECIFICATIONS.4SERVICE POINTS.5ADJUSTMENTS .9WIRING DIAGRAM.11PRINTED WIRING BOARD .12CIRCUIT DIAGRAM.22BLOCK DIAGRAM.28EXPLODED VIEW.29REPLACEMENT PARTS LIST .30RadioFans.CN 收音机爱 好者资料库 ENGLISH SAFETY PRECAUTIONS WA

5、RNING: The following precautions must be observed.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.

6、When service is required, observe the original lead 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

7、not evident from visual inspection, nor can the 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 r

8、eplacement parts list. The use of a substitute replacement 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 mainta

9、in lead lengths. Furthermore, where a short circuit 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 durin

10、g the dielectric strength test, applying 3kV AC 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 dan

11、ger of electrical shock. The service technician 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

12、contains parts that have been specifically approved 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

13、its original state, as this can have a bearing on 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

14、 picture tube. 2. High voltage should always be 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 lev

15、els. The high voltage must not, under any circumstances, 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 lim

16、it X-radiation. For continued X-radiation protection, 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

17、 equipped should be kept away while picture tubes 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. RadioFans.CN 收音机爱 好者资料库WARNINGCheck that exposed parts are acceptably insulated from the suppl

18、y circuit before returning the repaired instrument to the customer.CHECKING METHODMeasure the resistance value between the both poles of attachment cup (power supply plug) and the exposed parts (parts such as covers etc. where the customer can easily touch) and check that the resistance value is 500

19、k ohms or more.SAFETY PRECAUTIONSThe following precautions should be observed when servicing.Since many parts in the unit have special safety related characteristics, always use genuine HITACHI replacement parts. Especially critical parts in the power circuit block should not be replaced with other

20、makers. Critical parts are marked with a ? in the circuit diagram and printed wiring board.Before returning a repaired unit to the customer, the service technician must thoroughly test the unit to ascertain that it is completely safe to operate without danger of electrical shock.SPECIFICATIONS Audio

21、 section Video section Tuner section General Remote control unit (RB-DD1S)(Power amplifier)Rated output:Front:60 W + 60 W(8W/ohms, 20 Hz 20 kHz with 0.08 % T.H.D.)Centre:60 W(8W/ohms, 20 Hz 20 kHz with 0.08 % T.H.D.)Surround:60 W + 60 W(8W/ohms, 20 Hz 20 kHz with 0.08 % T.H.D.)Output terminalsFront:

22、A or B8 to 16W/ohmsA + B16W/ohms or moreCenter/Surround:8 to 16W/ohms(Analog)LINE input - PRE OUTInput sensitivity / input impedance:200 mV / 47 kW/kohmsFrequency response:10 Hz 50 kHz: +1, 3 dBS/N ratio:92 dB (IHF-A weighted)Total harmonic distortion:0.08 % (20 Hz 20 kHz)Rated output:1.2 VPHONO inp

23、ut-REC OUTInput sensitivity / input impedance:2.5 mV / 47 kW/kohmsRIAA deviation:1 dB (20 Hz 20 kHz)S/N ratio:74 dB (IHF-A weighted, with 5 mV input)Total harmonic distortion:0.03 % (1 kHz, 3 V)Rated output / Maximum output:150 mV / 7V(standard video jacks)Input/output level and impedance:1 Vp-p, 75

24、 W/ohmsFrequency response:5 Hz 10 MHz +1, 3 dB-15 FM (note: V at 75 W/ohms, 0 dBf = 1 10W)AMReceiving range:87.50 MHz 108 MHz (0.05 MHz step)522 kHz 1611 kHz (9 kHz step) (E, EBS), 522 kHz 1611 kHz(9 kHz step) (W, WUN)520 kHz 1710 kHz(10 kHz step) (W, WUN)Usable sensitivity:1.0 V (11.2 dBf)18 V50 dB

25、 quieting sensitivity:MONO1.6 V (15.3 dBf)STEREO23 V (38.5 dBf)S/N ratio:MONO80 dB (IHF-A weighted)STEREO75 dB (IHF-A weighted)Total harmonic distortion:MONO0.2 % (1 kHz)STEREO0.4 % (1 kHz)Power supply:AC 230 V, 50 Hz (E, EBS), AC 115/230 V, 50/60 Hz (W, WUN)Power consumption:180 WMaximum external d

26、imensions:434 (W) 144 (H) 320 (D) mmWeight:7.1 kgBatteries:R6P/AA Type (two batteries)External dimensions:54 (W) 172 (H) 27.2 (D) mmWeight:100 g (including batteries) Accessory suppliedOperating instructions, Remote control unit (RB-DD1S),R6P/AA batteries, AM loop antenna and FM indoor antenna * For

27、 purposes of improvement, specifications and design are subject to change without notice.1x 221x 2x 4Top cover3x 234x 119x 5Real plateSERVICE POINTS1.Removal of Top Cover(a)Remove 4 screws 2 from the rear plate.(b)Remove 2 screws 1 from each side.2.Removal of the Rear Plate(a)Remove 23 screws 3 and

28、1 screw 4 from the rear plate.(b)Remove 5 screws + from the Bottom Chassis.Fig. 1Fig. 2Connectors x 8Tuner PWBFlat cableDSP PWBVideo PWBDigital PWBZx 1Flat Cable x 110 x 68x 39x 17x 518x 46x 17Claws (PWB Support)83.Removal of Tuner/DSP/Video/Digital PWB Board(a)Remove the Flat cable Z at the Tuner P

29、WB.(b)Gently pull the Tuner/DSP/Video PWB Board upwards to detach 8 connectors from Main PWB Board.(c)Detach the connector from DSP PWB Board to remove the Digital PWB.4. Removal of Heat Sink and Transformer(a)Invert the Bottom Chassis, remove 2 screws 5 connect to the heat sink. (Fig. 5)(b)Remove 4

30、 screws 6 and pull the transformer upward together with the Power PWB section.5.Removal of Power PWB Board(a)Remove 1 screw 7 from the Bottom Chassis at the side.(b)Release board from its 3 holding claws (PWB SUPPORT) and gently pull the board free.6.Removal of Main PWB Board(a)Detach Flat cable fro

31、m FL PWB Board.(b)Remove 6 screws 8 to release the transistors from the heat sink.(c)Remove 3 screws 9 to release the bracket from the heat sink.(d)Remove 1 screw ! to release the main PWB from the Bottom Chassis.7.Removal of Surround PWB(a)Remove 5 screws to release surround PWB from the heat sink.

32、Fig. 3Fig. 4511x 4x 212 x 1Bottom ChassisBass/Treble KnobMaster Vol.Front Panel1313x 116x 2x 114 x 1115x 2Nut x 2Nut x 1Inner Panel8.Removal of Front Panel (a)Invert the Bottom Chassis and remove 4 screws .(b)Remove the Master Vol. & Bass/Treble Knob before remove the Front panel.9.Removal of Inner

33、Panel, Power Switch, Phone Jack and FL PWB(a)Release the inner panel from the Bottom Chassis by remove 1 screw # (Fig. 5) and 2 screws $.(b)Remove 11 screws % and 3 nuts to release the FL board.(c)Remove 2 screws & to release the Power Switch.(d)Remove 2 screws ( to release the Phone Jack.Fig. 5Fig.

34、 617x 410. Removal of Foot(a)Remove 4 screws ) to remove foot.Fig. 7ADJUSTMENTS1) FM DiscriminatorMeasuring instrument and condition.2) Voltage of covering (Reference)Measuring instrument and condition.Input Terminal Output Terminal Measuring InstrumentFrequencyAdjustReadingFM Antenna* R22DC Balance

35、 Meter98.1MHzT4030mV1kHz, 60 dB22.5kHz dev.BandDestinationFrequencySpecificationNoteLimit (V)Average (V)FM50 kHz step87.50 MHz1.3 - 3.72.3E, EBS, W,WUN108.00 MHz6.0 - 9.07.5AM10 kHz step520 kHz0.9 - 1.21.0W,WUN1,710 kHz6.0 - 9.07.59 kHz step522 MHz0.9 - 1.21.0E, EBS, W, WUN1,611 kHz6.0 - 9.07.5*R22D

36、C balance meterTEST PTBL1R513) Idling voltage (No adjustment is needed)Test pointsa) Front left channel (MAIN PWB)b) Front right channel (MAIN PWB)c) Center channel (MAIN PWB)d) Surr left channel (SURR PWB)e) Surr right channel (SURR PWB)ConditionMaster volume : - (min)Temperature : 15 30CReading (S

37、PEC)1) POWER ON AFTER ONE MIN.0.5 2.0 mV2) STABLE 1 HOUR0.8 8 mVIF THIS IDLING VOLT - 0.4 mVR625 (SURROUND LEFT)R626 (SURROUND RIGHT)R529 (FRONT LEFT)R530 (FRONT RIGHT)R416 (CENTER)NEED TO CUT AWAYIF 2.1 mVNEED TO ADD ABOVE RESISTOR(IF DONT HAVE ABOVE RESISTOR)C522L501JP51310K +10KJP514K42610K +10KR

38、429L401RY401JP40710K +10KR63910K+ 10KR64010K+ 10KSM0102WIRING DIAGRAMSM0102TUNER PCBSM0102SURR PCBSM0102DSP PCBSM0102FL PCBSM0102POWER PCBSM0102VIDEO PCBSM0102SPJK PCBSM0102SW-H-P PCBSM0102DIGITAL IN PCBSM0102MAIN CIRCUITSM0102DISP / TONE CIRCUITSM0102SURROUND MAIN AMP CIRCUITSM0102TUNER / VOLUME CI

39、RCUITSM0102DSP CIRCUITSM0102POWER SUPPLY / VIDEO CIRCUITAccessoriesAM LOOP ANTENNA 8TRemote ControlEDISON PLUG ADAPTERFM ANT38394047(W/WUN)VOLTAGE SELECTOR(W/WUN)45248414319463637423315141613FL DISP PWB4420112912213232BB2223BABA5262717355024TRANSFORMER7POWER CAUTION662434925(E, EBS)(E, EBS)45TUNER P

40、.W.B.VIDEO P.W.B.DSP P.W.B.1089MAIN P.W.B.341811AAAA11313028REPLACEMENT PARTS LISTPRODUCT SAFETY NOTE: Components marked with a ? have special characteristics important to safety. Before replacing any of thesecomponents, please read carefully the Service Manual.ABBREVIATIONS Capacitors . CK45: Disk

41、capacitor, CK73: Chip capacitor (E-12 series), CK14: Axial capacitor,CQ: Polyester film capacitor, CE: Electrolytic, CC73: Chip capacitor (E-24 series)Resistors. RD: Axial resistor, RN: Non-burn resistor, RMC73: Chip resistor, RE: Standingresistor, FR: Fuse ResisterSemiconductor . TR:Transistor, DI:

42、 Diode, ZD: Zener diode, VA: Varistor, TH: Thermistor, IC: ICC54 0890085R CER CAP B 680PF 50V K W, WUNC55 0890075R CER CAP SL 120PF 50V J E, EBSC56 0890101R CER CAP B 10000PF 16V KC57 0890101R CER CAP B 10000PF 16V KC59 0890101R CER CAP B 10000PF 16V KC60 0890101R CER CAP B 10000PF 16V KC61 0890096R

43、 CER CAP B 4700PF 25V K E, EBSC62 0890096R CER CAP B 4700PF 25V K E, EBSC65 0890101R CER CAP 10000PF 16V KC87 0800018Y ELECT CAP SSL 10F 50VC91 0800005Y ELECT CAP SSL 2.2F 50V E, EBSC92 0890084R CER CAP B 560PF 50V K E, EBSC93 0890101R CER CAP B 10000PF 16V K E, EBSC94 0800018Y ELECT CAP SSL 10F 50V

44、 E, EBSC95 0890119R CER CAP CH 27PF 50V J E, EBSC96 0890119R CER CAP CH 27PF 50V J E, EBSC97 0800018Y ELECT CAP SSL 10F 50V E, EBSC101 0893132R CHIP CAP 39CH 220PF J 50VC102 0893132R CHIP CAP 39CH 220PF J 50VC103 0800018Y ELECT CAP SSL 10F 50VC104 0800018Y ELECT CAP SSL 10F 50VC105 0893126R CHIP CAP

45、 39CH 100PF K 50VC106 0893126R CHIP CAP 39CH 100PF K 50VC107 0800034Y ELECT CAP SSL 33F 35VC108 0800034Y ELECT CAP SSL 33F 35VC109 0880041R MYLAR CAP 0.0056F K 50VC110 0880041R MYLAR CAP 0.0056F K 50VC111 0880004R MYLAR CAP 0.0015F K 50V AMZ TC112 0880004R MYLAR CAP 0.0015F K 50V AMZ TC113 0800005Y

46、ELECT CAP SSL 2.2F 50VC114 0800005Y ELECT CAP SSL 2.2F 50VC115 0893239R CHIP CAP 39F 10000PF Z 50VC116 0893239R CHIP CAP 39F 10000PF Z 50VC117 0800003Y ELECT CAP SSL 1F 50VC121 0893133R CHIP CAP 39CH 330PF J 50V E, EBSC122 0893133R CHIP CAP 39CH 330PF J 50V E, EBSC123 0893133R CHIP CAP 39CH 330PF J

47、50V E, EBSC124 0893133R CHIP CAP 39CH 330PF J 50V E, EBSC125 0893133R CHIP CAP 39CH 330PF J 50V E, EBSC126 0893133R CHIP CAP 39CH 330PF J 50V E, EBSC127 0893133R CHIP CAP 39CH 330PF J 50V E, EBSC128 0893133R CHIP CAP 39CH 330PF J 50V E, EBSC129 0893135R CHIP CAP 39CH 470PF J 50V E, EBSC130 0893135R

48、CHIP CAP 39CH 470PF J 50V E, EBSC131 0893232R CHIP CAP C1608 0.1F 25VC132 0893232R CHIP CAP C1608 0.1F 25VC133 0893232R CHIP CAP C1608 0.1F 25VC1 0890101R CER CAP B 10000PF 16V KC4 0890062R CER CAP SL 12PF 50V JC6 0800059Y ELECT CAP SSL 220F 25VC7 0890101R CER CAP B 10000PF 16V KC8 0890074R CER CAP

49、SL 100PF 50V JC11 0284623R ELECT CAP SME (BP) 1F 50VC12 0800003Y ELECT CAP SSL 1F 50VC13 0900042Y ELECT CAP SSL 47F 25VC15 0890101R CER CAP B 10000PF 16V KC16 0890074R CER CAP SL 100PF 50V JC17 0890074R CER CAP SL 100PF 50V JC18 0890101R CER CAP B 10000PF 16V KC19 0800001Y ELECT CAP SSL 0.47F 50VC20

50、 0800003Y ELECT CAP SSL 1F 50VC21 0800018Y ELECT CAP SSL 10F 50VC22 0890102R CER CAP F 22000PF 50V ZC23 0890074R CER CAP SL 100PF 50V J W, WUNC24 0880054R CAP POLY FILM 0.056F K 50VC25 0800026Y ELECT CAP SSL 22F 50VC26 0800026Y ELECT CAP SSL 22F 50V E, EBSC27 0800026Y ELECT CAP SSL 22F 50VC28 080005