Hitachi-CXW300-cs-sch 维修电路原理图.pdf

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1、0 HITACHI SERVICE MANUAL TY No. 682E CX-W300 UC,E,E(BS),W,W(UN),W(AU) KHMzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA V Of -N MOIT038 J HSR 8 CAUTIOIM DANGER Invisible laser radiation when open and interlocks failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. GEFAHR Unslchtbare Laser-Strahlu

2、ng wenn Interlook (Blockierung) funktionsuntchtig oder abgeschaltet. UNMITTELBAREN KONTAKT MIT DEM STRAHL UNBEDIGT VERMEIDEN. DANGER Faire trs attention aux radiations mises par ie faisceau laser invisible au dfaillance du verrouillage. NE JAMAIS SEXPOSER DIRECTEMENT AU FAISCEAU. VARNING Nar apparat

3、en ppnats och skyddsanordningen felar eller satts ur funktion forekommer osynlig laserstralning. UNDVIK DIREKTE BESTRALING. ADVARSEL Nar apparatet abnesog beskyttelsesanordningen ikke virker eller saettes un af funktion, forekommer der usynlig laserstraling. UNDGA DIREKTE BESTRALING. ADVARSEL Nar de

4、nne delen er apen som felge av at lasen er utkoplet eller ikke fungerer, eksisterer det usynlig laserstraling. UNNGA A BLI UTSATT FOR DIREKTE BESTRALING! VARIOITS Laite lahettaa nakymatnta lasersateilya, kun se avataan ja kun sisaiset turvalukot eivat tolml. VARO JOUTUMASTA ALTTIIKSI SATEILYLLE. CON

5、TENTS SPECIFICATIONS 2 DISASSEMBLY INSTRUCTIONS 3 INSTRUCTION FOR HANDLING OPTICAL SYSTEM BLOCK PICKUP 4 PICKUP REPLACEMENT 5 DIAL POINTER SETTING 7 TEST POINT LOCATIONS (TUNER) 10 TUNER ALIGNMENT SET UP 11 TUNER ALIGNMENT 12 TEST POINT LOCATIONS (CD) 18 CIRCUIT ADJUSTMENT 20 TROUBLESHOOTING CHARTS

6、22 SCHEMATIC DIAGRAM 31 PCB VIEWS 43 WIRING DIAGRAM 53 EXPLODED VIEW 57 ELECTRICAL PARTS LIST 65 I SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT. CD PLAYER INCORPORATED-HiGH PERFORMANCE PORTABLE CREATIVE SOUND SYSTEM November 1991 YOKOHAMA WORKS RadioFans.CN 收音机爱 好者资料库CX-W300 1 SAFE

7、TY PRECAUTIONS The following precautions should be observed when servicing. 1. Since many parts in the unit have special safety-related characteristics, always use genuine Hitachis replacement parts. Especially critical parts in the power circuit block should not be replaced with other makers. Criti

8、cal parts are marked with A in the circuit diagram and printed wiring board. 2. 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 1 ; GENERAL SEC

9、TION Power Supply: Power Consumption: Power Output: Speakers: Dimensions: Weight: AC: 120V, 60 Hz for UC AC: 230V, 50 Hz for E AC: 240V, 50 Hz for E(BS) AC: 110-120V/220-240V, 50/60 Hz for W, W(UN), W(AU) DC: 9V D CELL (lEC R20) .- SUM1 X 6 or equlpment 16 W 20 W P.M.P. (AC operation) 3 W X 2 (10% T

10、.H.D. DC operation) 10 cm X 2 3 n 550 (W) X 185 (H) X 196 (D) mm 4.5 kg (with batteries) . RADIO SECTION Circuit System: FM/MW/LW-3bands Tuning Range: superheterodyne for E, E(BS) FM/SW/MW-3bands superheterodyne for W, W(UN),W(AU) FM/MW-2bands superheterodyne for UC FM: 87.5 to 108.5 MHz except UC F

11、M: 88 to 108 MHz for UC SW: 3.9 to 12 MHz for E, E(BS) MW: 520 to 1,620 kHz except UC MW: 520 to 1,740 kHz for UC LW: 148 to 287 kHz for E, E(BS) Intermediate Frequency: Antennas: (Aerials) FM: 10.7 MHz MW/LW: 465 kHz for E(BS) SW/MW/LW: 455 kHz except E(BS) FM/SW/SW2: Rod antenna SW/MW/LW; Built in

12、 ferrite antenna TAPE RECORDER SECTION Tape: Tracl Figure 1 QD 8. Remove four screws holding the main P C B . 9. Remove the volume control panel. 10. Remove one screw () holding the select switch arm. Figure 2 11. Remove six screws Q) holding the cassette mechanism. Figure 3 Figure 4 Checl that expo

13、sed parts are acceptably insulated from the supply circuit before returning the instrument repaired to the customer. Checking method Power (Operate) switch is set to ON. Next, measure the resistance value between the both poles of attachment cup (Power supply plug) and the CD OUT terminal of rear pl

14、ate and check that the resistance value is 500 kohms or more. (Exposed part) qu) ISDiJtsV (E Insulation tester (DC 500V) CX-W300 INSTRUCTION FOR HANDLING OPTICAL SYSTEM BLOCK PICKUP Electrostatic breakdown of the laser diode in the optical system block may occur due to a potential 5; difference caus

15、ed by electrostatic charge accumulated on clothing, human body, etc. g A ground must be provided as follows to prevent any electrostatic charge during unpacking or repair work. ; 1. Ground for Human Body - Be sure to wear a grounding band ( 1 Mohm) that is properly grounded to remove any static elec

16、tricity that may be charged on the body. 2. Ground for Work bench : , . Be sure to place a conductive sheet ( 1 Mohm) or copper plate with proper grounding on the work bench or other surface on which the pickup is to be placed. 3. Because the static electricity charge on the clothing does not discha

17、rge through the body grounding band, do not let clothing contact the pickup unit. i INCORRECT teT .d HfiftezyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA iuo Ground Conductive Wrist Band for Body in 1. Remove the CD mechanism assemdy by referring to disassembly instructions. 2. Remove two sore

18、ws holding the CD PCB. (See Figure 8.) 3. Remove four sorews () holding the CD mechanism. (See Figure 8.) _ . 4. Remove washer (D) holding the gear and remove the gear. (See Figure 9.) 5. Remove two sorews (E) . (see Figure 9.) ,rro -.tqsiR .Cf Figure 9 CX-W300 6. Take out the pick-up (T). Then pull

19、 out the shaft . (See Figure 10.) boib ertt T feesf er)* Jaej (9 oiJstE 0 n9v3 ja bsriuoig 2 mo aboib Figure 10 7. Place shorting round as shown in Figure 11 and remove both wire connectors. 8. Unpack new pick-up. White Red lli 9. After you connect the wire connectors, desolder and remove the shorti

20、ng tab. (See Figure 12.) 10. Replace shaft and pick-up. 11. Replace two screws . 12. Replace gear and washer (B) . 13. Replace four screws (g) holding the CD mechanism. 14. Replace two screws (K) holding the CD PDB. Short Round bns .e s Figure 12 Short Round 15. Replace the CD mechanism chassis. - 6

21、 -CX-W300 DIAL POINTER SETTING i. . ., - d bluoriz ti ,i6q9lzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA o soiv 1. Remove the tuner chassis. 2. Turn the PVC gear counterclockwise. 3. Turn the tuning knob and slide the pointer to the check position on the tuner chassis. 4. Replace the tuner c

22、hassis. dtiW sni 166I ,iv.vJ bfxiT 31 io , c Tuning Knob .3811 1 - , , Check Position 8 - 7 -CX-W300 1 f;: Whenever a unit is brought in for service or repair, it shouid be cleaned and lubricated and the head shouid be demagnetized. lUOO 1 1. Cleaning: Clean the head and all tape handling surfaces u

23、sing Standard cleaner and cotton swabs. Wipe dry. 2. Demagnetization: Do not use magnetized tools near the head, since they can magnetize it. With normal use, the head will retain small amounts of residual magnetism which results in increased noise and loss of high-frequency response. Use a Standard

24、 tape head demagnetizer to demagnetize the playback head. 3. Lubrication: Use a high-grade of specially formulated lubricant in the appropriate places. Lubrication is normally required only when parts tend to bind, or after long periods of use. Use all lubricants sparingly and avoid contact with oth

25、er parts. .S Pre-Adjustment Procedures * s - 1. Be sure to demagnetize and clean the head before proceeding with head adjustment. 2. Never use a magnetized screwdriver for the head adjustment. Tape Speed (Figure 14) 1. Remove the front cabinet. 2. Connect a frequency counter to the headphone jack pa

26、rallel with a 32 ohm non-reactive dummy load.zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA -v-VN/-/- /-i-i (.- - . -. v 3. Adjust the pot, resistor in the motor to make the counter reading 3015 Hz while playing back 3000 Hz test tape. To Adjust Screwdriver Adjust Holl Motor Figure 14 - 8 -CX-

27、W300 : * A H T S . . 5 T R3HUT) aOiTAOOJ Playback Head Azimuth Adjustment (Cassette 1) (Figure 15) 1. Connect an SSVM or oscilloscope to each of the headphones jack (dummy load 32 ohm) . 2. Playback an 8 kHz test tape and turn the azimuth adjustment screw to obtain the maximum output level of the le

28、ft and right channels, in the forward and reverse play modes. 3. When the output level of the left and right channels, and forward and reverse position differs, zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA1 . . readjust to make the both channels, and both directions at the same level. ! 4. A

29、fter adjustment, secure the screw with lock paint or glue. Record/Playback Head Azimuth Adjustment (Cassette 2) (Figure 15) 1. Connect an SSVM or oscilloscope to each of the headphone jack (dummy load 32 ohm) . 2. Playback an 8 kHz test tape and turn the azimuth adjustment screw to obtain the maximu

30、m output level of the left and right channels. 3. When the output level of the left and right channels differs,readjust to make the both channels at the same level. 4. After adjustment, secure the screw with lock paint or glue. or - 9 -CX-W300 TEST POINT LOCATIONS (TUNER) Cfor E, E (BS) , W, W (UM)

31、, W (AU) 3 - 1 0 -CX-W300 TUNER ALIGNMENT SET UP Tkl3MH0A FI3VIUT Loop Antenna (8i bnt SSVM Scope Headphone I I J L M A 39*8 Dummy Load 32 ohm I Figure 18 ,.M J U_ Ssope FM IF Sweep Generator Set - O V H O -Scope signal O H Out O Ceramic 0.022uF H ( - O V I n O -I T P 3 O - O G N D G N D O - O T P 2

32、 FM Signal Generator JL Ceramic o.OluF TfT - i Set Figure 19 SSVM Scope inzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA O FM Dummy I to T P 2 L Headphone Jack _ J L I I Dummy Load 32 ohm Figure 20 cjsiB FM Dummy FM S G . (8f bnfe 8.? syiuyt) inamngilA ?1 .VJ R 1 = Z 0 ZO = Output impedance of

33、 FM S G . - - R 2 = 7 5 ohm-zo/ 2 S g f c i g.linuT t ! I Figure 21 ,vpc Set SSVM Counter T P 5 O -T P 2 O -1 )T Het I I J L i l i pniAOBil i i r f Dummy Load 330k ohm Figure 22 - 1 1 -CX-W300 TUNER ALIGNMENT Cfor E, E (BS) : AM IF Alignment (Figures 16 and 18) I I l!,.n.H MA Step Alignment Frequenc

34、y of Signal Generator Tuning Dial Setting Adjustment Remark s li IF Calibration 1000 kHz 1000 kHz T 2 Obtain sine-wave and maximum amplitude. Max. ( MW RF Alignment (Figures 16 and 18) 11 O I 1 v o OjI ; O H V Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks Tuning

35、 Range Calibration 515 kHz Low end L 5 1635 kHz High end Obtain sine-wave and maximum amplitude. T C 5 Adjustment of Tracking 600 kHz 600 kHz L 3 Max. 1400 kHz 1400 kHz T C 3 Repeat the above adjustments. LW RF Alignment (Figures 16 and 18) Step Alignment Frequency of Signal Generator Tuning Dial Se

36、tting Adjustment Remarks Tuning Range Calibration 145 kHz Low end L 6 290 kHz High end Obtain sine-wave and maximum amplitude. T C 6 Adjustment of Tracking 150 kHz 150 kHz L 4 Max. 280 kHz 280 kHz T C 4 Repeat the above adjustments. - 1 2 -CX-W300 JA H3HUT FM IF Alignment (Figures 16 and 19) Step Al

37、ignment Frequency of Signal Generator Tuning Dial Adjustment Rpmarlo: Step Alignment Frequency of Signal Generator Setting Adjustment 1 IF Calibration 10.7 MHz Low End Turn L 7 fully counter clockwise. 2 T 1 Obtain symetrical curve and maximum amplitude. 1 r 1 i Max. 10.7 MHz 3 L 7 Obtain S curve an

38、d maximum amplitude. 1 1 Max. u 10.7MH2 80TzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA V hna rlgiH FM RF Alignment (Figures 16, 20 and 21) I 5 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBAi c Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks Tuning R

39、ange Calibration 87.35 MHz Low end L 2 Obtain sine-wave and maximum amplitude. 108.25 MHz High end TC 2 Adjustment of Tracking 90 MHz 90 MHz L 1 106 MHz 106 MHz TC1 Max. Repeat the above adjustments. -1 I sHM 01 I S lt.A.I-i i - 1 3 -CX-W300 TUNER ALIGNMENT Cfor W, W (UN) , W (AU)zyxwvutsrqponmlkjih

40、gfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA 1 AM IF Alignment (Figures 16 and 18) (erzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA bns 8f eeiuei* tnemneilA M Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks IF Calibration 1000 kHz 1000 kHz ! r j T 2 Obtain sine-wave a

41、nd maximum amplitude. Max. T r bf. MW R F Alignment (Figures 16 and 18) Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks 1 Tuning Range Calibration 515 kHz Low end L 5 Obtain sine-wave and maximum amplitude. 2 Tuning Range Calibration 1635 kHz High end T C 5 Obtain

42、 sine-wave and maximum amplitude. 3 Adjustment of Track ing 600 kHz 600 kHz L 3 Adjustment of Track ing 600 kHz 600 kHz L 3 Adjustment of Track ing Max. 4 1400 kHz 1400 kHz T C 3 Max. UU 5 Repeat the above adjustments. 1 SOT SW R F Alignment (Figures 16 and 18) b i HpiH 1 HM Oe 1 sHM OP Step Alignme

43、nt Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks Tuning Range Calibration 3.8 MHz Low end L 6 12.3 MHz High end Obtain sine-wave and maximum amplitude. T C 6 Adjustment of Tracking 5 MHz 5 MHz L 4 Max. 10 MHz 10 MHz T C 4 Repeat the above adjustments. - 1 4 -CX-W300 F M I F Al

44、ignment (Figures 16 and 19) (8t bne Tf ! MA Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks q9T-IF Calibration 10.7 MHz Low End Turn L 7 fully counter clockwise. T 1 Obtain symetrical curve and maximum amplitude. r Max. V 10.7 MHz ! L 7 Obtain S curve and maximum

45、amplitude. Max. 10.7 MHz i 0T , li li I . i F M R F Alignment (Figures 16, 20 and 21) Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks Tuning Range Calibration 87.35 MHz Low end L 2 108.25 MHz High end Obtain sine-wave and maximum amplitude. T C 2 Adjustment of Tra

46、cking 90 MHz 90 MHz L 1 106 MHz 106 MHz TC1 Max. Repeat the above adjustments. l CX-W300 TUNER ALIGNMENT Efor H, H C : AM I F Alignment (Figures 17 and 18) Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks IF Calibration 1000 kHz .tdO I -.me i 1000 kHz T 2 r T Obtai

47、n sine-wave and maximum amplitude. I Max. 4 MW R F Alignment (Figures 17 and 18) Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks Tuning Range Calibration Adjustment of Tracking 515 kHz Low end L 4 1750 kHz High end TC 4 Obtain sine-wave and maximum amplitude. 600

48、kHz 600 kHz L 3 1400 kHz 1400 kHz TC 3 Repeat the above adjustments. Max. FM I F Alignment (Figures 17 and 19) Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Remarks IF Calibration 10.7 MHz Low End Turn L 5 fully counter clockwise. T 1 L 5 .X; 0 Obtain symetrical curve a

49、nd maximum amplitude. Max. 10.7MHz Obtain S curve and maximum amplitude. Max. V 10.7 MHz - 1 6 -CX-W300 (00) aoiTAOOj THioqzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA TBST FM RF Alignment (Figures 16, 20 and 21) Step Alignment Frequency of Signal Generator Tuning Dial Setting Adjustment Rem

50、arks 1 Tuning Range Calibration 87.5 MHz Low end L 2 Obtain sine-wave and 2 Tuning Range Calibration 108.5 MHz High end T C 2 l l l e t A I I I I U I M d l l I j J I I l U U B . 3 Adjustment of Tracking 90 MHz 90 MHz L 1 Max. 4 Adjustment of Tracking 106 MHz 106 MHz TC1 Max. UU 1 5 Repeat the above