Hitachi-KHWS1WUN-dr-sm 维修电路原理图.pdf

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1、No. 0096ESPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENTKHWS1WKHWS1WUNNovember 1999 DIGITAL RECEIVERHITACHI CONSUMER PRODUCTS (S)This documentation is applied to rescrictions for management, export and supply to overseas based on the WassenaarArrangement.CONTENTSSPECIFICATIONS .2SERVI

2、CE POINTS .3ADJUSTMENTS .7TROUBLESHOOTING .10BLOCK DIAGRAM OF ANTENNA AND TUNER UNIT.17DATA OF MICROPROCESSOR .18SEMICONDUCTORS.24WIRING DIAGRAM .30PRINTED WIRING BOARD.31METHOD OF REMOVED IC .36CIRCUIT DIAGRAM .37BLOCK DIAGRAM .41EXPLODED VIEW.43REPLACEMENT PARTS LIST .4501/BKpg KH-WS1 cover10/11/0

3、0, 1:42 PM1RadioFans.CN 收音机爱 好者资料库KH-WS1 2 SAFETY PRECAUTIONSThe following precautions should be observed when servicing.1. Since many parts in the unit have special safety-related characteristics, always use genuine Hitachis replacementparts. Especially critical parts in the power circuit block sho

4、uld not be replaced with other makers. Critical partsare marked with 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 ascertainthat it is completely safe to operate without danger of electrica

5、l shock.SPECIFICATIONS WS (WorldSpace digital broadcast) SectionCircuit system:Digital ReceiverBroadcast method:WorldStar 1 MethodReceiver frequency:L-Band (1453.384-1490.644 MHz)Input/Output terminalsAntenna input terminalType/Impedance:F-type/50 Polarization voltage: LHCP 2.5-2.2 VRHCP 3.3-2.8 VMa

6、x. current supply: 70 mAExternal terminal:9-pin, for future expansionWS antenna (Built-in, detachable type):WorldStar 1 Method compatibleantennaGain: over 6 dBiDimensions: 150 x 33 x 156 mm(w x h x d) Radio SectionCircuit system:FM/MW/SW1/SW2 4-bandsSuperheterodyneTuning range:FM: 87.5 - 108 MHzMW:

7、522 - 1620 kHz (9 kHz steps)520 - 1620 kHz (10 kHz steps)SW1:2.300-7.300 MHzMeter band: 120, 90, 75, 60,49, 41 mSW2:9.500-26.100 MHzMeter band: 31, 25, 21, 19, 16,13, 11 mAntennas:FM/SW1/SW2: Telescopic antenna(aerial)MW: Built-in ferrite-core antenna(aerial) General SpecificationsPower supply:AC: 1

8、10-127 V/220-240 V, 50/60 HzDC: 6 V“D” cell or IEC R20 or equivalent x 4(Optional)DC input jackInput voltage : DC 6 V + 30%,10% (DC 7.8 V 5.4 V)Current consumption: max. 400 mAPower (mains) consumption: 5 WAudio output:3 W (PMPO)300 mW (DC operation, 10% THD)Speaker:65 mm Cone/8 Output/Impedance:Hea

9、dphones (stereo)/Suitable impedance: 8-100 Line out (stereo)/2.2 kBattery life time:30 hours over by using alkaline (LR20)batteries.12 hours over by using manganic(R20P) batteries.(Use HITACHI battery/Measuredmethod: EIAJ CP-2905A)Dimensions:240.5 x 162.5 x 64.5 mm240.5 x 162.5 x 93 mm (w x h x d)(i

10、ncluding the WS antenna and handle)Weight:1.5 kg (without batteries),1.9 kg (with batteries) AccessoriesAC power cord:1AC plug adaptor:1F-type connector:1 set (for making an extention coaxialcable)Waterproof cover:1Waterproof tape:1NOTE:* Specifications are subject to change without notice.Check tha

11、t exposed parts are acceptably insulated fromthe supply circuit before returning the repaired instrumentto the customer. Checking methodMeasure the resistance value between the both poles ofattachment cup (Power supply plug) and the exposedparts (Parts such as Knob, Cover, etc. where the cus-tomer i

12、s easy to touch.) and check that the resistancevalue is 500 kohms or more.INSTRUMENT(Exposed part)Insulation tester (DC 500V)KH/Pg 02 (Spec)10/11/00, 1:44 PM2RadioFans.CN 收音机爱 好者资料库KH-WS1 3 SERVICE POINTS1. Removal of Back Case (Fig. 1)(1) Remove 3 screws 1 from the back and 2 screws 2 inside the ba

13、ttery compartment.(2) Detach the Antenna from the Ant .(3) Detach the connector A.2. Removal of SATELLITE P.W.B. Board (Fig. 2)(1) Detach all connectors B, C and D.(2) Remove 1 screw 3 from the Satellite P.W.B. Board.(3) Remove 2 screws 4 from the Satellite P.W.B. Board.(4) Release the 3 catches and

14、 slide the Satellite P.W.B. Board away.2. Removal of TUNER P.W.B. Board (Fig. 3)(1) Detach 5 connectors E, F, G, H and I from the Tuner P.W.B. Board.(2) Turn to the opposite side, remove 1 screw 5 from the Tuner P.W.B. Board.(3) Detach 9 catches and separate the Tuner P.W.B. Board from the sub-chass

15、is.3. Removal of Insulator Pad (Fig. 4)(1) Remove 6 screws 5 from the Insulator pad.4. Removal of Main Board (Fig. 5)(1) Remove 4 screws 6 from the Main Board.5. Removal of Speaker (Fig. 6)(1) Release one end of the metal pin that secures the speaker position.(2) Slide out the speaker.6. Removal of

16、POWER SUPPLY P.W.B. Board (Fig. 7)(1) Remove 4 screws 7 and detach 1 connector J from the Power Supply P.W.B. board.7. Removal of ANTENNA P.W.B. Board (Fig. 7)(1) Remove 1 screw 9 from the Antenna P.W.B. board.(2) Gently pull the Antenna P.W.B. board outwards.8. Removal of WS ANTENNA SUPPORT PLATE (

17、Fig. 7)(1) Remove the 6 screws 8 and pull the WS Antenna Support Plate away from the Back case.KH/Pg 03 (Service Pt)10/11/00, 2:23 PM3KH-WS1 4 Fig. 359 CatchesConnectorHConnectorSub-ChassisIConnectorEConnectorFConnectorGFig. 1Fig. 212Back caseFront caseBattery cover4Connector3 CatchesAnt 3AConnector

18、 BConnector CConnector DKH/Pg 04-06 (disassembling)10/11/00, 1:47 PM4KH-WS1 5 Fig. 4Fig. 556KH/Pg 04-06 (disassembling)10/11/00, 1:47 PM5KH-WS1 6 Fig. 6Fig. 7metal pin78Connector J9KH/Pg 04-06 (disassembling)10/11/00, 1:47 PM6KH-WS1 7 ADJUSTMENTS Adjustment points (Must adjust RADIO Part only. Adjus

19、tment on WS Part is not necessary.)Remarks:* After adjustment, should be fix following parts by Electro Wax.L201, L202, L206* After adjustment, do not touch the alighed components. (especially L201 and L202)KH/Pg 07-09 (Adjustment)10/11/00, 1:48 PM7KH-WS1 8 Adjustments(1) Before Adjustment1) Set the

20、 Power SW to ON.2) Set the Radio Function.(2) Alignment for Tuning Capacitor Voltage Range (Covering)1) Required Instruments* Signal Generator* DC volt meter2) Alignment Procedure* Connect a DC Volt meter to TP4 (J201)(3) Alignment for AM IF and MW, SW1, 2 TrackingBandOutput TerminalFMTP4MWTP4SW1TP4

21、SW2TP4SG frequency & SET TuneAdjustmentReading87.5 MHzL2021.4 V 0.1108 MHz6 7.5 V1)520 kHz (10 kHz step)/522 kHz (9 kHz step)L2101.2 V 0.12)1620 kHzCT2077.2 V 0.33)Repeat step 1-21)2.3 MHzL2081.1 V 0.12)7.3 MHzCT2058.8 V 0.33)Repeat step 1-21)9.5 MHzL2091.6 V 0.12)26.1 MHzCT2069.0 V 0.33)Repeat step

22、 1-2Remarks: Instrument Connection*1: With a 470 F/6.3 V capacitor to the TP2 (-) and J209/+B(+) IC202.*2: Mean Note 2 (See page 17)Note: AM TRACKING ERROR SPEC 6dB.StepItem1AM IF2(1)MW Ant(2)(3)3(1)SW1 Ant(2)(3)4(1)SW2 Ant(2)(3)Required Instrument & ConnectionInstrumentInputOutputGenescope (*1)Ferr

23、ite Ant.*2TP1AM signal generatorF. Ant *2TP1400 Hz, 30% Mod.ACVTM, oscillscopeMW: Note 2P1TP1SW1,2: Note 5P1TP1Genescope orReceivingAdjustReadingSG Freq.Freq. (Set)450 kHzHigh end Freq.T202Max.Note 1600/603 kHz600/603 kHzL206Max.1400/1404 kHz1400/1404 kHzCT204Repeat steps (1) & (2)3.2 MHz3.2 MHzL205

24、Max.7.1 MHz7.1 MHzCT203Repeat steps (1) & (2)11.65 MHz11.65 MHzL204Max.21.45 MHz21.45 MHzCT202Repeat steps (1) & (2)KH/Pg 07-09 (Adjustment)10/11/00, 1:48 PM8KH-WS1 9 (4) Alignment for FM IF and FM TrackingNote:1. Feed in a week signal from the Genescope.Adjust T202 for max. gain and the waveformof

25、Fig. 1.2. Connect AM signal generator to loop antenna,bring near to ferrite antenna.3. Input signal methode as follows.4. Feed in a week signal to IC201 (Note 3) from thegenescope. Use the T201 core to from the S-curve shown in the Fig. 2.Adjust the symmetry of A and B about point C forlinearity.5.

26、SW1, SW2 dummy antenna is shown in Fig. 3.6. FM dummy antenna is shown in Fig. 4.R1=Rg=SGs output impedance (75 ),R2=75 - Rg/2(5) Alignment for Clock Time AccuracyStepItem1IF2(1)FM(2)(3)Required Instrument & ConnectionInstrumentInputOutputGenescopeIC201TP1Note 3FM signalP1TP1Generator400 Hz, 22.5 kH

27、z DevNote 6Genescope orReceivingAdjustReadingSG Freq.Freq. (Set)10.7 MHzHigh End (orT201Max.106.1 MHz)Freq.Note 490.2 MHz90.2 MHzL201Max.106.1 MHz106.1 MHzCT201Repeat steps (1) & (2)BandAdjustmentFMCT301ProcedureConnection1)Tune FM to 108 MHz2)Connect a Freq. Counter to J308To J3083)Adjust CT301 to

28、reach the frequencyTo Counter118.7 MHz 1.5 kHzKH/Pg 07-09 (Adjustment)10/11/00, 1:48 PM9KH-WS1 10 TROUBLESHOOTINGNoNoNoNoNoYesYesYesYesYesYesYesNoYesNoNoYesYesNoV inPin No.212223505153WSHHLHHHRADIOHLHLHH3.6V3.6VV outHLNoNoYesYesOKConnect to AC outlet.Can the time displayappear?Can the power SW turnO

29、N?Can the power SW turnON after pressing theReset key?Is the oscillator circuit ofIC301 and pinin operation?Check IC301 control circuit.Does the timeand BATTdisplays appearon the LCD,then theydisappear after2 seconds?CheckIC301.Does the port ofIC301 pinoperate in H?(+3V)IC303 or Q303 is broken down.

30、IC303 operationDoes every port of IC301 , , , , and pin operate on the following?Check around IC301.Is it broken down?Is the LCD displayfollowed the right table?Check and followthe flowchart for each functions.Proceed to each flowchart.Is the voltage to theVoltage Selector set correctly?Disconnect t

31、he power cordand set the voltage correctly.Check the +3 V line.Check, the oscillator circuitor IC301 is broken down.Check BATTdisplay.Is BATTblinking onthe LCD?Check Q302, 307and D318CN302 PinIC301 Pin4.2VBATTblinks.Check the ACvoltage or replacethe battery incase of batteryexhaustion.Check whether

32、IC301 pinline is in H or not.LCD displayDisplay when the power turns ON without signal.eg)Check after resetting.WS FunctionWS SAT/SEARCH/AFRST - 1/Displaying NO BEAMand the functionFM FunctionFM 87.50MHzIs the voltage toIC301 pin 3 V?Is the oscillator circuit ofIC301 and pin in operation?Failure in

33、the oscillatorcircuit of IC302 pin forthe LCD driver or in IC3021. System CheckKH/Pg 10-17 (TroubleSht)10/11/00, 1:50 PM10KH-WS1 11 WS FunctionNoNoNoYesLCD DisplayAWS (SC)LEVEL1STEREO LOCKEDW SS A TYesYesYesYesAt receivingWS SATSEARCHAFRST1NO BEAM(when no signalreceived)DisplayBroadcast name(when an

34、ysignal received) 1*oreg)orCBBIs the display of part on LCDfollowed on the following?Is there any sound fromspeakers even though thedisplay is correct?Problem may inWS circuit.Proceed to item (2).Does only the part of Functiondisplay appear?LCD display is abnormalthough any trouble is notfound in re

35、ceivingoperation.Are the operationsof terminal pins forCN304 followed on thetable 1 when CN304 isdisconnected?Failure in IC301or CN304Figure 1PG304CN3041LHH552(L) HHH443Clock signal335Clock signal226LLClock signal117HHH778LLL57719LClock signal597410LClock signal587211LLL6075Power Off(STANDBY)Power O

36、n(NO BEAM)At receiveIC101 No.64 Pin 80 PinTable 12. WS section(1) Determine whether WS circuit malfunctions or communications to control microcomputer malfunction.KH/Pg 10-17 (TroubleSht)10/11/00, 1:50 PM11KH-WS1 12 (2) Checking and flowchart for WS circuitDetermine the display on LCD and the presen

37、ce or absence of sound from speakers after turning the power ON.Note:The terminal number of IC101is assumed 64-pin type in the flowchart. For 80-pin type, refer to tables 1 to 4 and note.StartNoYesWSFunctionYesYesStartNoYesYesNote : 80 PinType nos. and NoNoNoNoIs any sound output fromspeakers when c

38、hanging themode into RADIO?Check the audio circuitaround IC206, IC207,and IC210.NoCheck whether IC301, and pin are in Hor not.Check the terminalsof PG304 to IC101,IC101 may malfunction.NoIs the oscillator circuit ofIC101 and pinin operation?Check the oscillatorcircuit or IC101 maybe in failure.Is IC

39、103 pin clocked in at 14.725 MHzCheck R155 andaround IC103 pin.Are IC102 , , , pinand IC103 , , , pinfollowed the table 3?Check every port ofIC102 and IC103.Is IC103 pin clockedout at 24.576 MHz andclocked into IC102 pin?Check around IC102 pin and IC103 pin,IC103 may malfunction.Are the operations o

40、f IC103 and pin followed thetable 4?Check around IC103,IC103 may malfunction.Is any clock signal found inIC101 and pin?Table 2Table 3Table 4HHHHHHHIC101 No.64 Pin80 PinPower Off (STANDBY)Power Off(STANDBY)Power On(NO BEAM)Power On(NO BEAM)At receiveAt receiveConnect toanother ICConnect toanother IC2

41、836293730383240334141424346475354585952LLLLLLLLLLLLLLLLLL(reset)HL (reset)HHLLLLL(reset)HL (reset)HL (reset)Sync PulseData signalData signalData signalClock signalClock signal27212625242820IC102IC10374140392IC102No.Power Off(STANDBY)Power On(NO BEAM)At receiveConnect toIC 101 No.IC102No.303132331622

42、232733LLLLLLLLHLHLH27262524233564 Pin80 Pin33323028IC103 No.24 kHzDigital audio data8 kHz32302524HL (Sync puls)HL (Sync puls)1 When no sound from speakers though any trouble isnot found in receiving and display2 When no operation goes onOnly the part C of figure 1 or abnormal display will appearon L

43、CD.KH/Pg 10-17 (TroubleSht)10/11/00, 1:50 PM12KH-WS1 13 3 When the operation malfunctions after receiving operation startsStartNoororororWS SATNO BEAMororetc.SEARCHNoYesYesYesNoNoNoNoNoNoNoSEARCHDisplay of part on LCD:Continue blinkingof SEARCHReceivingoperationIs the oscillator circuit ofIC102 - an

44、d -pin inoperation?Can I2C bus line connected fromIC101 - and -pin to all ICsoperate? (80 pin nos. and )Are IC101 -pin and IC102 -pin in H?Is every port connected fromIC101 -pin to IC102 andIC103 in H?Check the circuits connected toeach IC terminals, the patternsand the soldered parts, theconcerned

45、IC may malfunction.Is the synchronous pulse H Lrepeated at IC103 -pin?Does IC103 -pin operatein L?Check around theterminals of IC103and IC101. When the stations receivable with other units can not be received though the operation is properExecute SEEK Search.Push MODE and BEAM SEEK keys.Can IC101 -p

46、in switch H to Lafter starting SEEK until it ends?(80 pin: )Check IC101.Check IC105 andIC106.Check the output line ofIC105 and IC106, andaround the terminals of RF101.Does the voltage for RF101 (Tuner) -pinchange from 3 V to 2.4 V when SEEKsearch until it ends?Is there voltage output between the cen

47、ter pinand the ground of the antenna jack on the unitwhen the antenna is disconnected?Does the voltage change from 3 V to 2.4 Vwhen SEEK search until it ends?Check the output line ofIC105 and IC106, andaround the terminals of RF101.4 When the stations receivable with other units can not be received

48、though the operation is properKH/Pg 10-17 (TroubleSht)10/11/00, 1:50 PM13KH-WS1 14 No12345678910IC101 47Pin(80pin No: 59)IC101 28Pin(80pin No: 36)IC101 32Pin(80pin No: 40)IC101 46Pin(80pin No: 58)IC102 12Pin(80pin No: 16)IC101 29Pin(80pin No: 37)IC101 35, 36Pin(80pin No: 43, 44)IC101 30Pin(80pin No:

49、 38)IC101 33Pin(80pin No: 42)IC101 35, 36Pin(80pin No: 43, 44)IC102 20pinIC103 2pinIC103 7pinIC103 39pinIC102 28pinIC103 43pinWS TUNER 8pinIC103 41pinIC102 22, 23pinIC102 27pinIC103 40pinIC102 21pinIC102 22, 23pinIC terminal no.IC function / I/ODataConnect toCheck to confirm operationWS RESET/Output

50、Reset IC102 and IC103.DCEN/OutputPUP IN/InputPUP OUT/OutputClock 14.725 MHz/OutputWRDY/InputI2 C BUS / I/OWSEN/InputSYNC/InputI2 C BUS / I/OI2 C BUS communicationI2 C BUS communicationClock waveformTurn IC103 on.Make sure IC103 is turned on.Turn IC102 on.IC103 generates 24.576 MHz from this clock(14