Hitachi CX-W300 User manual

0 HITACHI
•SERVICEMANUAL
TY
No. 682E
CX-W300
[UC,E,E(BS),W,W(UN),W(AU)]
KHMzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBAV Of-N
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.
1zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA i9ob Bnifitob(c>
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.
IIU( 'io,9iittuo9>teT.d
HfiftezyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA iuo
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
i.......,-
• •dbluorizti,^i6q9lzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA'\o soiv
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-

CX-W300
TUNER
ALIGNMENT SET UP Tkl3MH0üA FI3VIUT
LoopAntenna
(8i
bnt
SSVM
Scope
Headphone
I
I
J L
MA
39*8
Dummy Load 32ohm
I Figure 18
,«.M
'\J U_• Ssope
FM
IF
SweepGenerator Set
-O
V H O-
Scope signal
—OH Out
O—
Ceramic
0.022uF
H(
-OV InO-
I TP3
O-
-OGNDGNDO--OTP2
FMSignalGenerator
JLCeramic
"o.OluF
TfT
'-i
Set
Figure 19
SSVM
Scope
inzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA O
FM Dummy
I
to
TP2L
Headphone
Jack ^_J{L^ I
I
Dummy Load 32ohm
Figure 20
cjsiB
FM Dummy
FMSG.
(8f
bnfe 8.?syiuytï)inamngilA"?>1'.VJ
R1=Z0 ZO= Output impedance ofFM SG. - - ^
R2=75 ohm-zo/ 2 Sgüfc'i g.linuT t !
^I Figure 21,vpc
^ Set SSVM Counter
TP5 O-
TP2 O-
1^ )T
Het I
I
J L
ili
pniAOBil ' i
ir f
Dummy Load
330k ohm
Figure 22
-11-

CX-W300
TUNER ALIGNMENT
Cfor E,E (BS):
AMIF
Alignment(Figures 16and18)
I
I
l!,.n..HMA
Step Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment Remark
s
li
IF Calibration 1000
kHz 1000 kHz
T2 Obtainsine-wave and
maximumamplitude.
Max.
(
MWRF
Alignment(Figures 16and18)
11 O—I 1
vo
O—j—I ; O H V
Step Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment
Remarks
TuningRange
Calibration 515
kHz
Low end
L 5
1635 kHz
High end
Obtainsine-wave and
maximumamplitude.
TC 5
Adjustment of
Tracking 600
kHz
600 kHz L 3
Max.
1400
kHz 1400 kHz
TC 3
Repeat the aboveadjustments.
LW RF Alignment(Figures 16and18)
Step Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment
Remarks
TuningRange
Calibration 145
kHz
Low end
L6
290 kHz
High end
Obtainsine-wave and
maximumamplitude.
TC 6
Adjustment
of
Tracking 150
kHz 150 kHz
L 4
Max.
280
kHz
280 kHz
TC 4
Repeat
the aboveadjustments.
-12-

CX-W300
JA H3HUT
FMIFAlignment(Figures16and19)
Step
Alignment
Frequency
ofSignal
Generator
Tuning
Dial Adjustment Rpmarlo:
Step
Alignment
Frequency
ofSignal
Generator Setting
Adjustment
1 IF Calibration 10.7MHz
Low End TurnL 7
fully counter
clockwise.
2
T1 Obtainsymetricalcurve
andmaximumamplitude.
1
r 1
i Max.
10.7MHz
3 L 7 ObtainS curveand
maximumamplitude.
1
1
Max.
u
10.7MH2
80TzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBAV' hna rlgiH
FMRFAlignment(Figures16,20and21)
I5 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
i c
Step Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting
Adjustment
Remarks
TuningRange
Calibration
87.35MHz
Low end
L 2 Obtainsine-waveand
maximumamplitude.
108.25 MHz
High end
TC2
Adjustmentof
Tracking
90MHz 90MHz
L 1
106MHz 106MHz
TC1
Max.
Repeattheaboveadjustments.
Ü -1
I
sHM 01
•>I
' S
^>lt.A..I»-i i \
-13-

CX-W300
TUNER ALIGNMENT
Cfor W,W (UN), W (AU)zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA1
AMIFAlignment(Figures16and18)
(erzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBAbns 8feeiuei"^*tnemneilAM'^^
Step
Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment
Remarks
IF Calibration 1000kHz 1000kHz
!r
j
T2 Obtainsine-waveand
maximumamplitude.
Max.
T
r
bf.
MWRFAlignment(Figures16and18)
Step
Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment 'Remarks
1
TuningRange
Calibration 515kHz
Low end
L 5 Obtainsine-waveand
maximumamplitude.
2
TuningRange
Calibration 1635kHz
High end
TC 5
Obtainsine-waveand
maximumamplitude.
3
Adjustmentof
Track ing 600kHz 600kHz
L 3
Adjustmentof
Track ing 600kHz 600kHz
L 3
Adjustmentof
Track ing
Max.
4 1400kHz 1400kHz
TC 3
Max.
'UU
5
Repeattheaboveadjustments.
1
SOT
SW RFAlignment(Figures16and18)
bi» HpiH 1
^HM Oe1 sHMOP
Step Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment
Remarks
TuningRange
Calibration 3.8MHz
Low end
L 6
12.3MHz
High end
Obtainsine-waveand
maximumamplitude.
TC 6
Adjustmentof
Tracking
5 MHz 5 MHz L 4
Max.
10MHz 10MHz
TC 4
Repeattheaboveadjustments.
-14-

CX-W300
FMIFAlignment(Figures16and19) (8tbneTf ^!MA
Step
Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment
Remarks
q9T>-
IF Calibration 10.7MHz
Low End TurnL 7
fully counter
clockwise.
T1 Obtainsymetricalcurve
andmaximumamplitude.
r
Max. V
10.7MHz
!
L 7 ObtainS curveand
maximumamplitude.
Max.
10.7MHz
i£0T
,lili'I. i
FMRFAlignment(Figures16,20and21)
Step
Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment
Remarks
TuningRange
Calibration
87.35 MHz
Low end L 2
108.25 MHz High end
Obtainsine-waveand
maximumamplitude.
TC 2
Adjustmentof
Tracking 90MHz 90MHz
L 1
106MHz 106MHz
TC1
Max.
Repeattheaboveadjustments.
l •

CX-W300
TUNER ALIGNMENT
EforH,HC:
AMIFAlignment(Figures17and18)
Step Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting
Adjustment Remarks
IFCalibration 1000kHz
.tdOI
-.mei
1000kHz T2
rT
Obtainsine-waveand
maximumamplitude.
I
Max.
4\
MWRFAlignment(Figures17and18)
Step Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment Remarks
TuningRange
Calibration
Adjustmentof
Tracking
515kHz Lowend L 4
1750kHz Highend TC4
Obtainsine-waveand
maximumamplitude.
600kHz 600kHz L 3
1400kHz 1400kHz TC3
Repeattheaboveadjustments.
Max.
FMIFAlignment(Figures17and19)
Step Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting
Adjustment Remarks
IFCalibration 10.7MHz LowEnd TurnL 5
fullycounter
clockwise.
T1
L5
.X;
0
Obtainsymetricalcurve
andmaximumamplitude.
Max.
10.7MHz
ObtainS curveand
maximumamplitude.
Max. V
10.7MHz
-16-

CX-W300
(00)a^oiTAOOjTHioqzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
TBST
FMRFAlignment(Figures16,20and21)
Step Alignment
Frequency
ofSignal
Generator
Tuning
Dial
Setting Adjustment
Remarks
1 TuningRange
Calibration 87.5MHz
Low end L 2 Obtainsine-waveand
2
TuningRange
Calibration 108.5MHz Highend
TC2 llletAIIIIUIM
dllIjJIIlUUB.
3 Adjustmentof
Tracking 90MHz 90MHz
L 1 Max.
4
Adjustmentof
Tracking 106MHz 106MHz
TC1
Max.
'UU'
1
5
Repeattheaboveadjustments.
Cfor E,E (BS), W,W (UN), W (AU), H,HCl
FMStereoAdjustment(Figures16,17and22)
Functin Switch:RADIOposition
Radio Switch:FM STEREO position
Adjust VR1ontheTunerPCBfora frequencycounterread76kHz.
Remarks:
1)WhenaligningFMIF,thesymmetricalcurvemaynotbeobtainedbysettingthemarkerofthe
sweep generator(10.7MHz). Thisisduetotheceramic filter usedintheunit.Regardlessof
themarker,alignthecurveassymmetricallyaspossible
with peakoutput.
2)Whenaligningtherangeandadjustingthetracking,proceed
with alignmentina sequenceof
FM—MW-LW:for E,E (BS)1 , FM—SW—MWCforW,W (UN), W (AU)1 ,
FM—MW CforH,HCl.
3)Usea screwdriver
with a plasticgripforallalignments.
-17-

CX-W300
TEST POINTLOCATIONS(CD)
EquipmentRequired
SSVM
FrequencyCounter
Oscilloscope
ARegularCompactDisc
Test DiscPHILIPS5A
Test DiscSONY YEDS- 18
Dummy loadlOkohm
Figure23
S
-18-

CX-W300
'M3ÏV1T8ÜIQAzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA TSüDf l I O
VTVM
P O-
I (
Figure 24
g g
O.zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA CL
OS bns?S •-•"'V+st-nlsui.DAcviag ^uoo'=5
. , Oscilloscope
O o-
I I
Figure 27
O T O
in inO
Q.
Q.
Oscilloscope
Ó O-
I I
Figure 25
TP504
TP502
J
Frequency Counter
Q
O-
Short
Figure 28
Oscilloscope
1 r - .
g g
1-Q-
1-
0
0
-
1 l J
Figure 26
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-19-

CX-W300
CIRCUIT ADJUSTMENT
Focus
Servo Adjustmet (Figures24,25and26)
Step Connect
Setting *
Adjust i Remarks1 !
Focus 0
ff
set Adjustmet
See
Figure 24
Play the regular disc
VR502 Obtain
the maxmumamplitude andthe biggest
diamondwindows
oftheeye pattern.
i
^sssmemamsiSkmmMmemm
The above ison example of good eye pattern.
The diamondwindow inthe centerportion are
large and clear.zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA ,zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA. i_.
EF Balance Adjustment
See
Figure 25
Play the regular disc
Push the"|>|>" key
VR501
-ov
EF balancesignal A=B
Gain Setting
See
Figure 26
Play the regular disc VR505
-ov 100 mVP-P
Focus errorsignal of about 100 mVp-p
2 To increase the focusgain, turn VR505counterclockwise
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