Hitachi CX-W300 User manual

0 HITACHI
•SERVICEMANUAL
TY
No. 682E
CX-W300
[UC,E,E(BS),W,W(UN),W(AU)]
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MOIT038 J'
HSR
[{8
^CAUTIOIM
DANGER
Invisible laser radiationwhenopenandinterlocksfailedordefeated.AVOID DIRECT EXPOSURE TOBEAM.
^GEFAHR
Unslchtbare Laser-Strahlungwenn Interlook (Blockierung)funktionsuntüchtigoderabgeschaltet.
UNMITTELBAREN KONTAKTMITDEMSTRAHLUNBEDIGTVERMEIDEN.
^DANGER
Faire trés attention auxradiationsémisespariefaisceau laser invisibleaudéfaillanceduverrouillage.
^NEJAMAIS
S'EXPOSER DIRECTEMENTAU FAISCEAU.
^VARNING
Narapparatenöppnats ochskyddsanordningenfelarellersattsur
funktion forekommerosynliglaserstralning.
UNDVIK
DIREKTE BESTRALING.
^ ADVARSEL
Narapparatetabnes^ogbeskyttelsesanordningenikkevirkerellersaettesunaffunktion,forekommerderusynlig
laserstraling. UNDGA DIREKTE BESTRALING.
^ ADVARSEL ^
Nardennedelen erapensomfelgeavatlasener
utkoplet ellerikkefungerer,eksistererdetusynliglaserstraling.
UNNGAA BLIUTSATTFOR
DIREKTE BESTRALING!
^VARIOITS
Laite lahettaanakymatöntalasersateilya,kunseavataanjakun sisaiset turvalukot eivattolml.VARO
JOUTUMASTA ALTTIIKSI SATEILYLLE.
CONTENTS
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 SETUP11
TUNER ALIGNMENT 12
TEST POINT LOCATIONS (CD)18
CIRCUIT ADJUSTMENT 20
TROUBLESHOOTING CHARTS 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 FORIMPROVEMENT.
CD PLAYER INCORPORATED-
HiGHPERFORMANCE
PORTABLE CREATIVE SOUND SYSTEM
November1991YOKOHAMAWORKS

CX-W300
1
SAFETY PRECAUTIONS
Thefollowingprecautionsshouldbeobservedwhenservicing.
1. Sincemanypartsintheunithavespecialsafety-relatedcharacteristics,alwaysusegenuineHitachi's
replacementparts.Especiallycriticalpartsinthepowercircuitblockshouldnotbereplacedwithother
makers. CriticalpartsaremarkedwithA inthecircuitdiagramandprintedwiringboard.
2.Beforereturning a repairedunittothecustomer,theservicetechnicianmustthoroughlytesttheunitto
ascertainthatitis completelysafetooperatewithoutdangerofelectricalshock.
SPECIFICATIONS
1;^
GENERAL SECTION
Power Supply:
Power Consumption:
Power Output:
Speakers:
Dimensions:
Weight:
AC:120V,60Hz[forUC]
AC:230V,50Hz[forE]
AC:240V,50Hz[forE(BS)]
AC:110-120V/220-240V,50/60Hz
[for W,W(UN),W(AU)]
DC:9V["D"CELL(lECR20).--^
SUM1 X 6 orequlpment]
16W
20W P.M.P.(ACoperation)
3 W X 2 (10%T.H.D.DCoperation)
10cmX 2
3 n
550(W)X 185(H)X 196(D)mm
4.5kg(withbatteries)
. RADIO SECTION
Circuit System:FM/MW/LW-3bands
Tuning Range:
superheterodyne[forE,E(BS)]
FM/SW/MW-3bands
superheterodyne
[for W,W(UN),W(AU)]
FM/MW-2bands
superheterodyne[forUC]
FM: 87.5to108.5MHz[exceptUC]
FM: 88to108MHz[forUC]
SW:3.9to12MHz[forE,E(BS)]
MW: 520to1,620kHz[exceptUC]
MW: 520to1,740kHz[forUC]
LW:148to287kHz[forE,E(BS)]
Intermediate
Frequency:
Antennas:
(Aerials)
FM: 10.7MHz
MW/LW:465kHz[forE(BS)]
SW/MW/LW:455kHz
[exceptE(BS)]
FM/SW/SW2:Rodantenna
SW/MW/LW;Builtinferrite
antenna
TAPE RECORDER SECTION
Tape:
Tracl< System:
Tape Speed:
Recording System:
Erasing System:
Frequency Response:
Output:
Load Impedance:
Cassettetape
4tracks2 channelsstereo
4.75cm/sec.
ACbias70kHz
Magnet
Normal:70to10,000Hz
CDout:0.5V
1 ka
Headphones:8 to100Q
Speaker: 3 fi
. CD PLAYER SECTION
Playing Time:
Diameter:
Sampling Frequency:
Quantization Number:
Frequency Response:
Approx.60minutes/oneside
120mm/80mm
44.1 kHz
16bitlinear/channel
20to20,000Hz
Specificationsaresubjecttochangewithoutnoticefor
performanceimprovement.
The
caution labels onlaser usage.
• NEVER TOUCH THELENS.
• NEJAMAISTOUCHERL'OBJECTIF.
• DIE LINSE NIEMALS BERÜHRENI.
• NOTOQUE NUNCA LALENTE.
mWLISERIItDIHIMI
FlllEOOROEFEHED.m
mam m» mmi mm u Mne ESI
OUVERI ET gUE IE «EffiOUUUE ESI IKFECIUEUI «1
COmOIJIIIE. EVIIEII lEtPOSITIM IMIECIE 011 IE «im
Cfor E,E (BS). W,W (UN), W (AU),]
tfor UC]
SUT3e
Cfor E,E (BS), W,W (UN), W (AU),3
O
1
(T—^——Tl
™ 0 CsiS-^-^ _ ^
CLASS1
LASER PRODUCT
3

CX-W300
DISASSEMBLY INSTRUCTIONS ^ ^^''Y8J
1. Openthecassettecoversandtakeoutthe
cassette tapes.
2. Removethe battery coverandbatteries.
3.Removeeightscrews@ holdingtherear
cabinet.' ^
4.Removetwoscrews(ë)andtwoscrews
(§)holdingtheCDmechanismkit.
5.Removetwoscrews(§)holdingtheCD
PCB.
6.Removefourscrews(E)holdingtheCD
mechanism.
7.Removetwoscrews(F)holdingthetuner
chassis.
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Figure1 ^Q^D
8.Removefourscrews@ holdingthe
mainPCB.
9.Removethevolumecontrolpanel.
10.Removeonescrew(§)holdingthe
select switcharm.
Figure2
11. RemovesixscrewsQ) holdingthe
cassette mechanism.
Figure3 Figure4
Checl< that exposedpartsareacceptablyinsulated
from thesupplycircuitbeforereturningthe
instrumentrepairedtothecustomer.
Checking method
Power(Operate)switchissettoON.
Next, measuretheresistancevaluebetweenthe
both polesofattachmentcup(Powersupplyplug)
andtheCDOUTterminalofrearplateandcheck
that theresistancevalueis500kohmsormore.
(Exposed part)
qu)ISDiJtsV(E
Insulationtester(DC 500V)

CX-W300
INSTRUCTIONFORHANDLINGOPTICALSYSTEMBLOCKPICKUP
Electrostaticbreakdownofthelaserdiodeinthe opticalsystemblockmayoccurduetoa potential5;
differencecausedbyelectrostaticchargeaccumulatedonclothing,humanbody,etc.g
Agroundmustbeprovidedasfollowstopreventanyelectrostaticchargeduringunpackingorrepair
work.;
1. GroundforHumanBody^^'^'^^' ^ - ^ " ® '
Besuretoweara groundingband( 1 Mohm)thatisproperlygroundedtoremoveanystatic
electricitythatmaybechargedonthebody.
2.GroundforWorkbench: , . ^
Besuretoplacea conductivesheet( 1 Mohm)orcopperplate withpropergrounding onthework
benchorothersurfaceonwhichthepickupistobeplaced.
3. Becausethe staticelectricitychargeontheclothingdoesnotdischargethrough thebody grounding'
band, donotletclothingcontactthe pickupunit.
iINCORRECT "<3)
Figure5
Note: Laserdiodesaresosusceptible to
damagefromstaticelectricitythatevenif
astaticdischargedoesnotruinthediode,
itcanshortenitslifeorcauseittowork
improperly.
CORRECT
0Groundingband
1Mn
^. V.!* ovanafl.8
.Rins(ioiiwif:mk.'
ConductiveSheet
orCopperPlate
Figure6
PRECAUTIONSFORCHECKINGBEAMEMISSIONOFLASERDIODE
Thelaserbeamofthisunitisfocusedonthereflectingsurfaceoftheobjectivelensinthe optical1
systemblock.Therefore,keepyoureyesatleast12inches(30cm)awayfromtheobjectivelenswhen^ j
thelaserdiodeisON.|.,^
j-iinnii monj
llOperationCheckMethodforLaserDiodeandFocusSearchFunctionHi
WhenthePOWERswitchisturnedONafterthechuckingarmisremoved,observethe objectivelens
andconfirm thatthe followingoperationsareperformedproperly.i
(Theopticalsystemblockshouldbeatthelead-inareapositionwhenitischeckedatthistime.)-.
(1)Thelasershouldbeattheinnermostpositionafterthechuckingarmisremoved.;1
(2)ThisdiffusedlightofthelaserbeamcanbeseenwhenthePOWERswitchisturnedON.ï ritoJ|;
(3)Vertical(upanddown)movementoftheobjectivelens(2or3 times)willtakeplace.'-'^

CX-W300
PICKUP REPLACEMENT
Caution:
Laser diodesareextremelysusoeptibietodamage from
static electricity.
Even ifa staticdischargedoesnotruinthediode,\
itcanshortenits
life or cause ittoworkimproperly.
Whenreplacingthepickup,usea oonductivemat,a
groundedsolderingiron,andsoon,toprotectthelaser
diode
from staticdamage.
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Ground Conductive
Wrist Band for Body
in
1. RemovetheCDmechanismassemdyby
referringtodisassemblyinstructions.
2. Removetwosorews@ holdingtheCD
PCB. (SeeFigure8.)
3. Removefoursorews(§)holdingtheCD
mechanism. (SeeFigure8.)_ .\
4. Removewasher(D)holdingthegearand
removethegear.(SeeFigure9.)
5.Removetwosorews(E). (seeFigure9.)
,rroï
-.tqsiR .Cf
Figure9

CX-W300
6. Takeoutthepick-up(T).Thenpull
outtheshaft@.(SeeFigure10.)
^boib erttT>
'feesf er)*Jaej
(9
oiJstE
^0« n9v3
ja bsöriuoig
2mo^^ aboib
Figure10
7. PlaceshortingroundasshowninFigure11
andremovebothwireconnectors.
8. Unpacknewpick-up.
White
Red
lli
9. Afteryouconnectthewireconnectors,
desolderandremovetheshortingtab.
(See Figure12.)
10. Replaceshaftandpick-up.
11. Replacetwoscrews.
12. Replacegearandwasher(B).
13. Replacefourscrews(g)holdingtheCD
mechanism.
14. Replacetwoscrews(K) holdingtheCD
PDB.
Short Round
bns
{.e s
Figure12
Short Round
15. ReplacetheCDmechanismchassis.
-6-

CX-W300
DIALPOINTERSETTING
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1. Removethetuner chassis.
2.
TurnthePVCgearcounterclockwise.
3. Turnthetuningknobandslidethepointertothecheckpositiononthetuner chassis.
4.Replacethetuner chassis.
dtiW
sni 166I' ,>iv.v>J bfxiT
31io,
c
TuningKnob
.3811^ 1-,,
Check Position
8-
-7-

CX-W300
1 f;;;;^^:
Whenever a unitisbroughtinforserviceorrepair,itshouidbecleanedandlubricatedandthe
headshouidbedemagnetized.
lUOO 1
1. Cleaning:CleantheheadandalltapehandlingsurfacesusingStandardcleanerandcottonswabs.
Wipedry.
2.Demagnetization:Donotusemagnetizedtoolsnearthe
head, sincetheycan magnetizeit.With
normaluse,theheadwillretainsmallamountsofresidualmagnetismwhichresults inincreased
noiseandlossofhigh-frequencyresponse.Usea Standardtapeheaddemagnetizertodemagnetize
theplayback
head.
3. Lubrication:Usea high-gradeofspeciallyformulatedlubricantinthe appropriateplaces.
Lubricationisnormallyrequiredonlywhenpartstendto
bind, orafterlongperiodsofuse.
Usealllubricantssparinglyandavoidcontactwithotherparts.
.S
Pre-AdjustmentProcedures* s ^^-^^
1. Besuretodemagnetizeandcleantheheadbeforeproceedingwithheadadjustment.
2.Neverusea magnetizedscrewdriverfortheheadadjustment.
TapeSpeed(Figure14)
1. Removethe frontcabinet.
2.Connecta frequencycountertotheheadphonejackparallelwitha 32ohmnon-reactivedummy
load.zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA ^• -v-'^^-'VN//-/- /-i-i' (.^- - '.-.v
3. Adjustthepot,resistorinthemotortomakethecounter reading3015Hzwhileplayingback
3000Hztest tape.
ToAdjust
Screwdriver
AdjustHoll
Motor
Figure14
-8-

CX-W300
:^*AHTS..5T {R3HUT)a^OiTAOOJ
Playback HeadAzimuthAdjustment (Cassette 1)(Figure15)
1.ConnectanSSVMor
oscilloscope to each oftheheadphonesjack(dummyload32ohm).
2. Playbackan8 kHztesttapeandturntheazimuthadjustment screw toobtainthemaximum
outputlevelofthe
left andright channels, intheforwardandreverseplaymodes.
3. Whentheoutputlevelofthe left andright channels, andforwardandreversepositiondiffers, zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
1.. readjusttomaketheboth channels, andbothdirectionsatthesamelevel.!
4.Afteradjustment,
secure the screw withlockpaintorglue.
Record/Playback HeadAzimuthAdjustment (Cassette 2)(Figure15)
1. ConnectanSSVMor oscilloscope to each oftheheadphonejack(dummyload32ohm).
2. Playbackan8 kHztesttapeandturntheazimuthadjustment screw toobtainthemaximum
outputlevelofthe
left andright channels.
3. Whentheoutputlevelofthe left andright channels differs,readjusttomaketheboth channels
atthesamelevel.
4.Afteradjustment,
secure the screw withlockpaintorglue.
or-9-

CX-W300
TEST POINTLOCATIONS(TUNER)
Cfor E,E (BS), W,W (UM), W (AU)3
-10-