Hitachi-DR100E-tape-sm 维修电路原理图.pdf

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1、 SM0093DR100E SERVICE MANUAL MANUEL DENTRETIEN WARTUNGSHANDBUCH 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

2、 lire les Prcautions de scurit et les Notices de scurit du produit 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. Data contained within this Service manual is s

3、ubject to alteration for improvement. Les donnes fournies dans le prsent manuel dentretien peuvent faire lobjet de modifications en vue de perfectionner le produit. Die in diesem October 1999 DR100EBSDR100UCDR100WDR100WUNRadioFans.CN 收音机爱 好者资料库SAFETY PRECAUTIONS WARNING: The following precautions mu

4、st be observed. ALL PRODUCTS 1. Before any service is performed on the chassis an isolation transformer should be inserted between the power line and the product. 2. When replacing the chassis in the cabinet, ensure all the protective devices are put back in place. 3. When service is required, obser

5、ve the original lead dressing. Extra precaution should be taken to ensure correct lead dressing in any high voltage circuitry area. 4. Many electrical and mechanical parts in HITACHI products have special safety related characteristics. These characteristics are often not evident from visual inspect

6、ion, 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 replacement parts list. The use

7、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. 5. Always replace original spacers and maintain lead lengths. Furthermore, w

8、here a short circuit has occurred, replace those components that indicate evidence of overheating. 6. Insulation resistance should not be less than 2M ohms at 500V DC between the main poles and any accessible metal parts. 7. No flashover or breakdown should occur during the dielectric strength test,

9、 applying 3kV AC or 4.25kV DC for two seconds between the main poles and accessible metal parts. 8. 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 se

10、rvice 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 contains parts that have been s

11、pecifically 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 its original state, as this can

12、 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 picture tube. 2. High voltage

13、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 levels. The high voltage must not,

14、 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 limit X-radiation. For continued X

15、-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 equipped should be kept away w

16、hile 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Specifications Track system: 4-track 2-channel Recording system: AC Bias Erasing system: AC Bias Tape

17、speed: 4.75 cm/s Included circuits: Dolby B and C NR, Dolby HX Pro Normal: 40 - 15,000 Hz CrO2: 40 - 16,000 Hz Usable tapes: Metal: 40 - 17,000 Hz Power supply: AC 230 V, 50 Hz (E/EBS), AC 120V 60 Hz (UC), AC 110-127/220-240V 50/60 Hz (W/WUN) Power consumption: 13 W (UC, E, EBS, W, WUN) Maximum exte

18、rnal dimensions: 210 (W) x 96.5 (H) x 316 (D) mm (including feet, controls and terminals) Weight: 2.7 kg * Specifications are subject to change without notice for performance improvements Removal of Top Cover 1. Remove 1 screw ? from each side. 2. Remove 6 screws ? from the rear plate. Removal of Re

19、ar Plate 1. Remove 3 screws ? and 1 screw ? from the rear plate. Removal of Power Cord 1. Detach the power cord connector from connector ?. Removal of Transformer 1. Remove 2 screws ? from the transformer. 2. Pull the transformer upwards to detach its connectors ? and ? from the main P.W.B. board. R

20、emoval of PB P .W.B. Board 1. Remove 1 screw ? from the base plate at the side. 2. Gently pull the PB P.W.B. board upwards to detach its 2 connectors ? from the main P.W.B. board and free the connector ? and ?. Removal of REC P .W.B. Board 1. Release the REC P.W.B. board from its holding claws and t

21、hen gently pull the board free of the connector ?. Removal of Main P .W.B. Board 1. Remove the remaining connectors ? (see Removing Power cord), ? and ? from the main P.W.B. board. 2. Remove 3 screws ? and 1 screw ? from the main P.W.B. board. Removal of Front Panel 1. Remove 1 screw ? from each sid

22、e of the base plate. 2. Invert the base plate and remove the 4 screws ?. 3. Remove the Front Panel after releasing the connector ?. Removal of Deck Mechanism and P .W.B. Holder 1. Remove 4 screws ? and then remove the deck mechanism. 2. Remove 3 screws ? and then remove P.W.B. Holder. Removal of Foo

23、t 1. Remove 4 screws ? and then remove foot. ADJUSTMENTS Adjusting and Checking the Electrical Section Measuring instruments needed for the adjustments 1. Low frequency oscillator 2. Variable resistance attenuator 3. Electronic voltmeter 4. Oscilloscope 5. Frequency counter 6. Adjustment screwdriver

24、 7. Test tapes MTT-111, MTT-114N, MTT-150, Type1 tape (UD-1) 8. Mirror cassette for the transport (A-BEX TCC-902) Adjustment precaution 1. Before adjustments, use gauze or a swab moistene with alcohol to wipe the surface of the heads, the capstan shaft, and the pinch roller. 2. Demagnetize the recor

25、d/playback head and the erase head with a head eraser. 3. Completely demagnetize the driver to be used for the adjustments. 4. Unless otherwise specified, set the various operation controls as indicated below. Dolby NR switch: Off 1. Tape transport check Load the mirror cassette for the transport, a

26、nd illuminate the area around the fixed guide of the record/playback head with a lamp and observe. Check that the tape edge is not hitting the tape guide portion. Note that the tape transport is the greatest factor affecting the performance of the cassette deck. Never move the inspection locations w

27、ithout good reason. 2. Tape speed check and adjustment 1. Connect the frequency counter to the LINE OUT pin and load the test tape (MTT-111). 2. Playback FWD side of the test tape. At about halfway through the tape, where the tape transport is stable, confirm that the frequency counter will have a r

28、eading within the range of 3,000 Hz 10 Hz. 3. Check REV side also that the counter reading indicates within 29553045Hz. Note: Adjust within 30 seconds, after pre-heating (Play) of 20 min, or more. 3. Azimuth Adjustment 1. Connect an electronic voltmeter to the Line Out terminal, and set Test tape MT

29、T-114N into the Unit. 2. Playback FWD side, and adjust the azimuth screw A so as to get maximum indication on the voltmeter, then make the same adjustment with the screw B for REV side. 3. Readjust if the output level difference exceeds 2dB after adjustment, and also confirm that the phase differenc

30、e in the both channels is within 45. Note: In order to prevent the backlash of the azimuth screw, end in the clockwise rotation. 4. PB Output Level Adjustment 1. Connect an electronic voltmeter to the Line Out terminal, and set Test tape MTT-150 into the Unit. 2. Playback FWD side, and adjust the RT

31、101L (Lch) and RT101R (Rch) so that the voltmeter indicates 400mV 0.5dB. 5. REC Level Adjustment 1. Set Test tape (Type 1 tape: UD-1) into the unit, input 400 Hz 94mV signal to JK1 LINE IN and record this signal on the tape. 2. Playback the recorded signal, and adjust RT102L (Lch) and RT102R (Rch) s

32、o that the voltmeter indicates 125mV 0.5dB at JK1 LINE OUT. 6. Bias Current Adjustment 1. Set Test tape (Type 1 tape: UD-1) into the unit, input 1.25 kHz/12.5 kHz 21mV signal to JK1 LINE IN and record this signal on the tape. 2. Playback the recorded signal, and adjust RT103L (Lch) and RT103R (Rch)

33、so that the level difference between both frequencies becomes within the range of 28mV + 2dB 0.5dB on the voltmeter at JK1 LINE OUT. Remark: Unable to monitor waveform at line out during recording mode. Adjustment Points Wiring Diagram Block Diagram Exploded View PB P.W.B.REC P.W.B.EBS ONLYE/EBS/UCW

34、/WUNPT P.W.B.FL P.W.B.MAIN P.W.B.VOLTAGESELECTORP.W.B.VoltageSelector(W/WUN)AC OUTLET (UC)FOREBS ONLYW/WUNE/EBS12098292527ACB73313110526111412132442630ABC171628182733231524222132212729191524Cassette Chassis Nos. are reference Nos. of parts list Cassette Loader Assembly Nos. are reference Nos. of par

35、ts list IC Data Replacement Parts List Part indicated with the mark “ are not always in stock and possibly to take along period of time for supplying, or in some case supplying of part may be refused. When ordering of part, clearly indicate “1” and “I” (i) to avoid mis-supplying. Ordering part witho

36、ut stating its part number can not be supplied. Part indicated with the mark “H“ is not illustrated in the exploded view. Not including Carbon Film 5%, 1/4W Type in the P.W.Board parts list. (Refer to the Schematic Diagram for those parts.) WARNING: Parts marked with this symbol ? have critical char

37、acteristics. Use ONLY replacement parts recommended by the manufacturer. Transistors CXA1561S (IC103) BA6209N (IC305) PC1297CA (IC105) DOLBY HX-PRO NJM2068 (IC102) THE UPDATED PARTS LISTFOR THIS MODEL IS AVAILABLE ON ESTA Hitachi, Ltd. Tokyo, Japan International Sales Division THE HITACHI ATAGO BUIL

38、DING, No. 15 12 Nishi Shinbashi, 2 Chome, Minato Ku, Tokyo 105-8430, Japan. Tel: 03 35022111 HITACHI EUROPE LTD, Whitebrook Park Lower Cookham Road Maidenhead Berkshire SL6 8YA UNITED KINGDOM Tel: 01628 643000 Fax: 01628 643400 Email: consumer-servicehitachi- HITACHI EUROPE S.A. 364 Kifissias Ave. &

39、 1, Delfon Str. 152 33 Chalandri Athens GREECE Tel: 1-6837200 Fax: 1-6835964 Email: service.hellashitachi- HITACHI EUROPE GmbH Munich Office Dornacher Strasse 3 D-85622 Feldkirchen bei Mnchen GERMANY Tel: +49-89-991 80-0 Fax: +49-89-991 80-224 Hotline: +49-180-551 25 51 (12ct/min) Email: HSE-DUS.ser

40、vicehitachi- HITACHI EUROPE S.A. Gran Via Carlos III, 101-1 08028 Barcelona SPAIN Tel: 93 409 2550 Fax: 93 491 3513 Email: atencion.clientehitachi- HITACHI EUROPE srl Via Tommaso Gulli N.39, 20147 Milano, Italia ITALY Tel: +39 02 487861 Tel: +39 02 38073415 Servizio Clienti Fax: +39 02 48786381/2 Em

41、ail: customerservice.italyhitachi- HITACHI Europe AB Box 77 S-164 94 Kista SWEDEN Tel: +46 (0) 8 562 711 00 Fax: +46 (0) 8 562 711 13 Email: csgswehitachi- HITACHI EUROPE S.A.S Lyon Office B.P. 45, 69671 BRON CEDEX FRANCE Tel: 04 72 14 29 70 Fax: 04 72 14 29 99 Email: france.consommateurhitachi- HIT

42、ACHI EUROPE LTD (Norway) AB STRANDVEIEN 18 1366 Lysaker NORWAY Tel: 67 5190 30 Fax: 67 5190 32 Email: csgnorhitachi- HITACH EUROPE AB Egebkgrd Egebkvej 98 DK-2850 Nrum DENMARK Tel: +45 43 43 6050 Fax: +45 43 60 51 Email: csgnorhitachi- HITACHI EUROPE AB Neopoli / Niemenkatu 73 FIN-15140 Lahti FINLAN

43、D Tel : +358 3 8858 271 Fax: +358 3 8858 272 Email: csgnorhitachi- Hitachi Europe Ltd Bergensesteenweg 421 1600 Sint-Pieters-Leeuw BELGIUMTel: +32 2 363 99 01 Fax: +32 2 363 99 00 Email: sofie.van.bomhitachi- HITACHI EUROPE LTD Na Sychrove 975/8 101 27 Praha 10 Bohdalec CZECH REPUBLIC Tel: +420 267 212 383 Fax: +420 267 212 385 Email: csgnorhitachi-