Akai ACR-21MP User manual

SERVICE MANUAL
Models:
ACR21MP
ACR31MP
ACR41MP
PULL SYNTHESIZED
STEREO RADIO WITH
COMPACT DISC PLAYER
DIGITAL
www.akai.ru

Car A ud io
Page
TABL E O F CONTE NT S
Technical Specifications ....................................................1-2
Measurement setup ....................................... .............1-3
Service A ids, Safety I nstruction, etc ....... ............. 1-4 to 1-5
Preparations & Controls ....................... ............. 1-6 to 1-11
Maintena nce & Troubleshooting ................. ................ 1-12
Disassembly Instructions & Service positions ..... ............. 2
Set Block diagram ...................................... ................... 3
Set W iring diagram ............................ ............................ 4
Key Board .......................................... ........................... 5
Servo Board ........................................ .......................... 6
Main Boa rd ......................................... . .. .................. ..... 7
Set Mechanical E x plo ded v iew & parts list .... .................... 8
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AKAI ACR-21MP/31MP/41MP

SPECIFICATIONS
1-2
Components
1
1
1
1
1
2
4
1
1
1
Note:Specificationsanddesignaresubjecttochange
withoutnoticeforproductimprovements.
MW(AM)Radio
Frequencyrange:
Usablesensitivity(S/N=20dB):
522-1620KHz(EUROPEMODEL)
530-1710KHz(USAMODEL)
30dB
DiscPlayer
System:
Frequencyresponse:
Signal/noiseratio:
Totalharmonicdistortion:
Wowandflutter:
Channelseparation:
Discdigitalaudiosystem
20Hz-20kHz
>86dB
Lessthan0.20%(1kHz)
Belowmeasurablelimits
>60dB
FMStereoRadio
Frequencyrange:
Usablesensitivity:
quietingsensitivity(S/N=50dB):
Frequencyresponse:
Stereoseparation:
Imageresponseratio:
IFresponseratio:
Signal/noiseratio
87.5-108.0MHz(EUROPEMODEL)
87.5-107.9MHz(USAMODEL)
65.0-74.0MHz(OIRTMODEL)
8dB
12dB
30Hz-15kHz
30dB(1kHz)
50dB
70dB
55dB
General
Powersupply:
Maximumpoweroutput:
Continuouspoweroutput:
Suitablespeakerimpedance:
Pre-Ampoutputvoltage:
Fuse:
Dimensions(WxHxD)
Weight:
AuxinLevel(optional):
Sub-out(optional):
ESP(optional):
12VDC(11V-16V)
Testvoltage14.4V,negativeground
50Wx4channels
20Wx4channels(4,10%T.H.D.)
4-8ohm
2.0V(CDplaymode:1KHz,0dB,10Kload)
15A
178x50x162mm
1.7kg
300mV
4.0V
(CD40s,MP3120s)
≥
≥≥
Mountingcollar
TappingscrewsM5x6mm
Mountingbolt(50mm)
Wireconnector
Removablefaceplatecase
Trimplate
T-key
Operatinginstructions
Rubbercushion
Remotecontrol(optional)

MEASUREMENTSETUP
TunerFM
DUT
RFGenerator
Bandpass
LFVoltmeter
e.g.PM5326
250Hz-15kHz
e.g.712270748001 e.g.PM2534
S/Nanddistortionmeter
e.g.SoundTechnologyST1700B
Useabandpassfiltertoeliminatehum(50Hz,100Hz)anddisturbancefromthepilottone(19kHz,38kHz).
TunerAM(MW,LW)
DUT
RFGenerator
Bandpass
LFVoltmeter
e.g.PM5326
250Hz-15kHz
e.g.712270748001 e.g.PM2534
S/Nanddistortionmeter
e.g.SoundTechnologyST1700B
Frameaerial
e.g.712270789001
ToavoidatmosphericinterferenceallAM-measurementshavetobecarriedoutinaFaradayscage.
Useabandpassfilter(oratleastahighpassfilterwith250Hz)toeliminatehum(50Hz,100Hz).
'
DUT
L
R
LEVELMETER
e.g.SennheiserUPM550
withFF-filter
S/Nanddistortionmeter
e.g.SoundTechnologyST1700B
UseAudioSignalDiscSBC429482239730184
(replacestestdisc3)
CD
1-3

1-4
SOLDER
CHIP
COMPONENT
GLUE
SOLDER
COPPERTRACK
P.C.B
SERVICEPACKAGE
GENERAL DISMOUNTING MOUNTING
SOLDERING
IRON
VACUUMPISTON
482239510082
e.g.WELLER
SoldertipPT-H7
SOLDERING
IRON
SOLDERWICK
482232140042
e.g.APAIROFTWEEZERS
HEATINGHEATING
SOLDERING
IRON
SOLDERWICK
CLEANING
PRECAUTIONS
COPPERTRACK
IRON
CORRECT
SOLDERING
IRON
SOLDERING
CHIPCOMPONENT
EXAMPLES
CORRECT
IRON
SOLDERING
NO！
e.g.APAIROFTWEEZERS
SLODERING
IRON
SLODER
SLODERINGTIME
SLODERING
IRON
Φ0.5-0.8mm
<3secretary/side
PRESSURE
PRESSURE
SOLDER
Φ0.5-0.8mm
A
B
C
B
A
HANDLINGCHIPCOMPONENTS

WARNING
GB
AllICsandmanyothersemi-conductorsare
susceptibletoelectrostaticdischarges(ESD).
Carelesshandlingduringrepaircanreducelife
drastically.
Whenrepairing,makesurethatyouare
connectedwiththesamepotentialasthemass
ofthesetviaawristwrapwithresistance.
Keepcomponentsandtoolsalsoatthis
potential.
CLASS1
LASERPRODUCT
ATTENTIONGB
Safetyregulationsrequirethatthesetberestoredtoitsoriginal
conditionandthatpartswhichareidenticalwiththosespecified,
beused.
1-5
ATTENTION
TouslesICetbeaucoupd'autres
semi-conducteurssontsensiblesaux
dechargesstatiques(ESD).
Leurlongevitepourraitetreconsiderablement
ecourteeparlefaitqu'aucuneprecautionn'est
prisealeurmanipulation.
Lorsdereparations,s'assurerdebienetrerelie
aumemepotentielquelamassedel'appareilet
enfilerlebraceletsertid'uneresistancede
securite.
Veilleracequelescomposantsainsiqueles
outilsquel'onutilisesoientegalementace
potentiel.
WARNING
D
AlleICsundvieleandereHalbleitersind
empfindichgegenuberelektrostatischen
Entladungen(ESD).
UnsorgfaltigeBehandlungimReparaturfallkan
dieLebensdauerdrastischreduzieren.
VeranlassenSie,dassSieimReparaturfalluber
einPulsarmbandmitWiderstandverbunden
sindmitdemgleichenPotentialwiedieMasse
desGerates.
BauteileundHilfsmittelauchaufdiesesgleiche
Potentialhalten.
F
ESD NL
I
WAARSCHUWING
AlleIC'senveleanderehalfgeleiderszijn
gevoeligvoorelectrostatischeontladingen
(ESD).
Onzorgvuldigbehandelentijdensreparatiekan
delevensduurdrastischdoenverminderen.
Zorgervoordatutijdensreparatieviaeen
polsbandmetweerstandverbondenbentmet
hetzelfdepotentiaalalsdemassavanhet
apparaat.
Houdcomponentenenhulpmiddelenookop
ditzelfdepotentiaal.
AVVERTIMENTO
TuttiICeparecchisemi-conduttorisono
sensibiliallescarichestatiche(ESD).
Lalorolongevitapotrebbeesserefortemente
ridattaincasodinonosservazionedellapiu
grandecauzioneallaloromanipolazione.
Duranteleriparazionioccorrequindiessere
collegatoallostessopotenzialechequellodella
massadell'apparecchiotramiteunbraccialetto
aresistenza.
Assicurarsicheicomponentieanchegliutensili
conqualisilavorasianoancheaquesto
potenziale.
Pourvotresecurite,cesdocuments
doiventetreutilisespardesspecia-
listesagrees,seulshabilitesareparer
votreappareilenpanne.
NL
F
D
I
DK
SF
S
GB
Veiligheidsbepalingenvereisen,dathetapparaatbijreparatiein
zijnoorspronkelijketoestandwordtteruggebrachtendatonderdelen,
identiekaandegespecificeerde,wordentoegepast.
Afterservicingandbeforereturningsettocustomerperforma
leakagecurrentmeasurementtestfromallexposedmetalpartsto
earthgroundtoassurenoshockhazardexist.Theleakagecurrent
mustnotexceed0.5mA.
LenormedisicurezzaesigonocheI'apparecchiovengarimesso
nellecondizionioriginaliechesianoutilizzatiipezzidiricambio
identiciaquellispecificati.
Warning!
Varning!
Varoitus!
Advarse!
Invisiblelaserradiationwhenopen.
Avoiddirectexposuretobeam.
312211003420
Avatussalaitteessajasuojalukituksenohitettaessaoletalttiina
nakymattomallelaserisateilylle.Alakatsosateeseen!
Usynliglaserstrlingvedabningnarsikkerhedsafbrydereer
udeaffunktion.Undgaudsaettelseforstraling.
a
BeijederReparatursinddiegeltendenSicherheitsvorschriftenzu
beachten.DerOriginalzustanddesGeratsdarfnichtverandertwerden;
furReparaturensindOriginal-Ersatzteilezuverwenden.
LesnormesdesecuriteexigentqueI'appareilsoitremisaI'etat
d'origineetquesoientutiliseeslespiecesderechangeidentiques
acellesspecifiees.
Osynliglaserstralningnarapparatenaroppnadochsparren
arurkopplad.Betraktaejstralen.

PREPARATIONS
WiringDiagram
1-6
ACC+/red
AutoAntenna/blue
Battery12V(+)/yellow
Ground/black
Subwooferout
Fuse15A
(Green)
Antenna
ISOconnector
Line-outGray(Rear)
Line-outBrown(Front)
R(Red)
L(White)
R(Red)
L(White)
Connector

1-7
PowerOn:Pressanybuttononthepanelexcepttoturnontheunit.
CONTROLS
Play / Pause
Top play ( press
more than 2 sec.)
Intro play(10sec)
MP3 track+10 up
MP3 track-10 down
Track Random play
Track Repeat play

1-8
PowerOn:Pressanybuttonontheremotecontroltoturnontheunit.
2.Insertthebutton-typelithiumbatterywiththe
markfacingupward.
(+)
Insertthebatteryholderintothe
remotecontrol.
1.Pulloutthebatteryholderwhilepressingthestopper.
Replacingthelithiumbatteryofremotecontrolunit.
*Whentheoperationrangeofthecardremote
controlbecomesshortornoProperly,replace
thelithiumbatterywithanewone.Makesure
thebatterypolarityreplacementiscorrect.
(CR2025)
WARNINGS:
REMOTECONTROLS
Storethebatteryinplacewherechildrencannotreach.
Ifachildaccidentallyswallowsthebattery,
consultadoctorimmediately.
Donotrecharge,short,disassembleorheatthebattery
ordisposeitinafire.
Doinganyofthesethingsmaycausethebatterytogive
offheat,crackorstartafire.
Donotleavethebatterywithothermetallicmaterials.
Doingthismaycausethebatterytogiveoffheat,crack
orstartafire.
Whenthrowingawayorsavingthebattery,wrapitintape
andinsulate;otherwise,thebatterymaystarttogiveoff
heat,crackorstartafire.
Donotpokethebatterywithtweezersorsimilartools.
Doingthismaycausethebatterytogiveoffheat,crack
orstartafire.
MUTE
SEL
MENU
RDMRPTINT
/TOP
DISP
4321
65
VOL
BAND
SRC
AMS
Poweron/off
Mute
PushtoselectVOL/BAS/
TRE/BAL/FAD,useVolume
buttontoadjustlevel
Pushmorethan2seconds
toMenumode
Volume
RadioTune
TrackSeek
FM1
FM2
FM3
Displayswitch
DiscPlayback
RadioPreset
Presstotunein
apresetstation
Holdformore
than2seconds
tostorestation.
BandSwitch
SEARCH
SEARCH
DiscPlay
(whendiscisin)
AlternativeFrequencylist
REG(Region)mode
TAPTY
ProgramType
AF/REG
RadioPresetscan
RadioAutoPreset
AMS
MP3track/file/character
search
MP3track/file/character
search
TrafficAnnouncements
Identification
Auxin(optional)
Radio
OIRT
Play/Pause
Topplay(press
morethan2sec.)
Introplay(10sec)
TrackRepeatPlay
MP3track+10up
MP3track-10down
TrackRandomPlay
AM1
AM2
Rotatethecontroltochoosefront
panelbuttonilluminationcolor.
(Optional)
ESP(CD40s,MP3120s)≥≥

1-9
CONTROLS
Pressthebuttonmorethan2secondstoentermenumode,theneachpresschangesthemodeasfollows:
TAmodeMASKmodeDSPmodeLOUDON/OFFmodeESPmodeBEEPON/OFF
VOLmode
DN
UP
VOL
(onlyintunermode)(onlyinFMmode)
(CD40s,MP3120s)≥≥
COLORmode
(onlyintunermode)
SEEK1/2modeST/MOmodeLOCAL/DXmode
Donotapplyexcessiveforcetothepanel,doingsocancausedamagetotheunit.
Insertthediscintotheslot.Thepanelwillcloseautomatically.
Load:
Ifthereisadiscinside,thediscwillbeejectedautomatically.
DiscEject: Presstoslidedownthepanel.
Pressagaintoclosethepanel.
Presstoslidedownthepanel.
Panelslide
down/close:
Donotpresstoclosethepanelbeforethediscisinsertedcompletely,
doingsomaydamagethediscandtheunit.
TAmode:RotatetheknobtochooseTAALARMorTASEEKmode,WhenTAisturnedonandnotrafficprogramidentificationcode
hasbeenreceivedduringthespecifiedtime,noTA/TPisdisplayedandaccordingtotheMENUSELECT,alarmissetoff,
orTASEEKisactivated.
TAALARMmode :NOTA/TPisdisplayedandalarmissetoff. TASEEKmode:TASEEKisactivated.
ALBUM
MUSIC
ARTIST
ALBUM
MUSIC
ARTIST
Radio: RadioTunebystep:presslessthan0.5sec.
RadioSeekautomatically:pressmorethan0.5sec.
DiscPlayback: Trackskip:presslessthan0.5secondtogotothenextorprevioustrack.
Trackseek:pressmorethan0.5secondandholdittofastforwardorreversebackthetrack.
Pressbrieflytoscanthepresetstationfor5secondseach.Holdmorethan2seconds,the6
strongestavailablestationwillbeautomaticallysavedinthememoryofpresetbutton.
AMS:AutoMemoryStore
AMS
SETCLOCK
PressDISPbutton,timedisplays.Pressagainmorethan2seconds,timedisplayblinks.
Rotatetheknobclockwisetosethours.Rotatetheknobanticlockwisetosetminutes.
DISP
DN
UP
VOL

1-10
CONTROLS
COLORmode:Rotatethecontroltochoosefrontpanelbuttonilluminationcolor.
COLOR1: buttonilluminationcolorisRED.
COLOR2: buttonilluminationcolorisGREEN.
SEEK1/2mode: Rotatetheknobtochooseradioseekmode1or2.
SEEK1:searchingstationwillstopwhennextstationisreceived.
SEEK2:searchingstationwillstopwhenorbuttonisreleasedandnextstationisreceived.
ALBUM
MUSIC
ARTIST
LO/DXmode:Rotatetheknobtochoosetunersensitivitylocalordistant.
ST/MOmode:RotatetheknobtochooseFMstereoormono.
MASKmode:
rotatetheknob
tochooseMASKDPI
orMASKALLmode.
MASKDPImode:
OnlytheAFwhichhasdifferentprogramidentificationismasked.
MASKALLmode:
TheAFwhichhasdifferentprogramidentificationandNORDS
signalwithhighfieldstrengthismasked.
ALBUM
MUSIC
ARTIST
ALBUM
MUSIC
ARTIST
DN
UP
VOL
DSPmode:RotatetheknobtochooseDSPsoundeffect:
PDSPOFFOPROCKCLASSICFLAT
LOUDmode:Rotatetheknobtochooseloudonoroff.
BEEPON/OFFmode:Rotatetheknobtochoosebuttonbeepsoundonoroff.
DN
UP
VOL
VOLLAST/ADJUSTMODE
PressknobtochooseVOLLAST:theturn-onvolume
levelisthevolumeleveloflatestpoweroff.
RotateknobtochooseVOLADJ,
thenrotatetheknobtosettheturn-onvolumelevel.
ALBUM
MUSIC
ARTIST
ALBUM
MUSIC
ARTIST

1-11
MP3PLAYBACK
MP3CHARACTERSEARCH
PressAMSbuttonthreetimestoselect"CHARSCH"mode.
PressSELbuttonandAdisplayed.
NowIfpressSELbuttonmorethan0.5seconds.whichfirstcharacterofitsnameiswillbeplayed.
Rotatetheknobtoselectthe1stcharacterofthedesiredtracknameandpressSELbuttontoconfirm.
Thenflashsatthenextplace,select2ndandothercharacterofthedesiredtracknameasstepsabove.
PressSELmorethan0.5secondstoplaythetrackoftheselectname.
Example:tosearchcharacterECHO
""
thetrack"A"
"A"
"".
ALBUM
MUSIC
ARTIST
MP3
ALBUM
MUSIC
ARTIST
MP3
ALBUM
MUSIC
ARTIST
MP3
ALBUM
MUSIC
ARTIST
MP3
ALBUM
MUSIC
ARTIST
MP3
ALBUM
MUSIC
ARTIST
MP3
M3FilesearchP
PressAMSbuttontwiceto
select"FILESCH"mode.
Presstheknobtoenter.
Rotatetoselectfolder.theknob
IFyoujustwanttoplaysongsofthisfolder,presstheknob
morethan0.5secondtoplaythefirsttrackofthefolder.
IFyouwanttoplaydesiredtrackofthefolder,presstheknob
androtatetoselectthetrackyouwant.
Presstheknobagaintoplaythetrack.
ALBUM
MUSIC
ARTIST
MP3
WhileplayingM3disc,thefolder/filenameandID3tag(Songtitle,AlbumandArtist)canentirelyscroll
displayedontheLCDdisplay.
P
Elapsedplayingtime&TracknumbernumberSongtitleAlbumtitleArtistnameFoldername&Filename&number
ALBUM
MUSIC
ARTIST
MP3
M3TracksearchP
PressAMSbuttontoselect"TRACKSCH"mode.
PresstheknobandLCDdisplaywillshow"001".
IFyourdesiredtracknumberislessthan100,
rotatetheknobtoselectthefirstdigitandpressitonceagain
androtatesetthetenthdigitofthetracknumber.
Presstheknobagainmorethan0.5secondtoplaythetrack.
IFyourdesiredtracknumberismorethan100,
rotatetheknobtoselectthefirstdigitandpressittoconfirm,
rotatetheknobtoselectthetenthdigitandpressittoconfirm,
rotatetheknobtoselectthehundredthdigitandpressittoconfirm,
Presstheknobagaintoplaythetrack.
*Ifthetracknumberyouenteris
beyondthemaximumfilenumber,
lastsongwillbeplayed.
ALBUM
MUSIC
ARTIST
MP3
ALBUM
MUSIC
ARTIST
MP3
AMS
DN
UP
VOL
AMS
DN
UP
VOL

1-12
Troubleshooting
Ifyoususpectsomethingiswrong, immediatelyswitchpoweroff.Immediatelystopusingitandcallthestorewhereyoupurchasedit.
Nevertrytorepairtheunityourselfbecauseitisdangeroustodoso.
Whenadiscbecomesdirtycleanitwithacleaningcloth.
Wipethediscfromthecenterout.
Afterprolongeduse,dirtordustmayaccumulateatthelens.Toensuregoodplaybackquality,cleanthediscwithPhilipsCDlens
Cleaneroranycommerciallyavailablecleaner.Followtheinstructionssuppliedwithcleaner.
Toensuregoodplaybackquality,cleantheheadsA,thecapstanB,
andpressurerollerCafterevery50hoursoftapeoperation.Used
acottonswabslightlymoistenedwithcleaningfluidoralcohol.
Youcanalsocleantheheadsbyplayingacleaningtapeonce.
Clearingdisc
Cleaningthedisclens
CleaningtheheadsandtheTapeParts
Maintenance
MAINTENANCEANDTROUBLESHOOTING
General Radio
Disc
Stationistoofar,orsignalsaretooweak.
Selectotherstationsofhighersignallevel.
Muchnoisein
broadcasts
Presetstation
lost
Batterycableisnotcorrectlyconnected.
Connectthebatterycabletothe
terminalthatisalwayslive.
ErrorDisplayMessages
DiscisnotCDorcontainsnoMP3files.
Discupsidedown.
Recoveryerror,checkthedisc.
MP3error,checkthedisc.
Discisupsidedown.
Discisdirtyordamaged
Placediscinthecorrectdirection,
andthelabelsideup.
Cleandiscorchangeanotherdisc.
Discisbut
nosound.
inserted
Discsoundskips,
tonequalityislow.
Discisdirtyordamaged.
CleanCDorchangeanotherCD.
Mountingangleisover30o.
Adjustmountingangletolessthan30.
o
Unstablemounting.
Mounttheunitsecurelywiththe
mountingparts.
Soundskipsdue
tovibration.
Discmechanismerror：
Pressbuttontoejectthedisc.
Incasethatthedisccannotbe
ejectedbypressingbutton,
presstheRESETswitchandpress
thebuttonagain.
Ifstillnotejectingconsultyour
dealer.
Nopoweror
nosound
Car'sengineswitchisnoton.
Cableisnotcorrectlyconnected.
Fuseisburnt.
TurnyourcarskeytoACCorON.
Checkconnection.
Replacefuse.
Checkvolumeormuteon/off.
presstheRESETbutton.
Iftheabovesolutionscannothelp,
EJ
EJ
EJ

DISMANTLINGINSTRUCTIONS
Removetwoscrews
1Removetopcover
2Removeloader
3Removemainboard
Prizeupthe
topcover
Removetheseven
screws.
Removetwoscrews
ontheheadsinkat
leftside Removetwoscrews
atrightside
PulloutFPCwire
2-12-1
Removescrewatrear

2-2
DISMANTLINGINSTRUCTIONS
2-2
ServicePositionA
ServicePositionB
ServicePositionC
ServicePositionD

33
SETBLOCKDIAGRAM
LCDDisplay

44
SETWIRINGDIAGRAM

KEYBOARD
TABLEOFCONTENTS
LCDDisplay.....................................................................5-1
5-2
KeyBoardCircuitDiagram..............................................
5-3
KeyBoardLayoutDiagram.............................................
LCDPINCONNECTION
5-15-1
ElectricalPartsList..............................................5-4

5-25-2
KEYBOARD-CIRCUITDIAGRAM

5-35-3
KEYBOARD-LAYOUTDIAGRAM
TOPVIEW
KEYBOARD-LAYOUTDIAGRAM
BOTTOMVIEW