Akai AC-R41-MP, AC-R31-MP, AC-R21-MP Service Manual

PULL SYNTHESIZED

STEREO RADIO WITH

COMPACT DISC PLAYER

DIGITAL

Models:
ACR21MP
ACR31MP
ACR41MP

SERVICE MANUAL

www.akai.ru

Ca r A ud io

AKAI ACR-21MP/31MP/41MP

TABL E O F CONTE NT S

Page

Technical Specifications ........... .................. . .................. ....1-2

Measure ment setup . .. ................ .................. .. .......... ...1-3

Service A ids , S afety Instruction, etc ....... ............. 1-4 to 1-5

Preparati o ns & Contro ls ..... .................. ............. 1-6 to 1-11

Maintena nce & T rouble sh ooting .... ............. ........ ....... . 1-12

Disa ssembly Instructi ons & Serv ic e positi ons ..... ..... ........ 2

Set Block diagra m ....... .............. ....... .......... .......... ......... 3

Set W irin g diagram .... ........................ ....... .... ................. 4

Key Boar d ................ .................. ........ ... . .................. ..... 5

Servo Board ...... ....... ........... ....... ......... ... ........... ....... ..... 6

Main Boa rd .............................. ........... . ......................... 7

Set Mech anical Explod ed v iew & pa rts lis t .... ............... ..... 8

......

......

......

......

..... .

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......

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... ...

SPECIFICATIONS

1-2

General

Powersupply:

Maximumpoweroutput:
Continuouspoweroutput:
Suitablespeakerimpedance:
Pre-Ampoutputvoltage:
Fuse:
Dimensions(WxHxD)
Weight:
AuxinLevel(optional):
Sub-out(optional):
ESP(optional):

FMStereoRadio

Frequencyrange:

Usablesensitivity:
quietingsensitivity(S/N=50dB):
Frequencyresponse:
Stereoseparation:
Imageresponseratio:
IFresponseratio:
Signal/noiseratio

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)

≥≥

87.5-108.0MHz(EUROPEMODEL)

87.5-107.9MHz(USAMODEL)

65.0-74.0MHz(OIRTMODEL)

8dB

μ

12dB

μ

30Hz-15kHz
30dB(1kHz)
50dB
70dB
55dB

Ω

Ω

Components

Mountingcollar
TappingscrewsM5x6mm
Mountingbolt(50mm)
Wireconnector
Removablefaceplatecase
Trimplate
T-key
Operatinginstructions
Rubbercushion
Remotecontrol(optional)

1
4
1
1
1
1
2
1
1
1

MW(AM)Radio

Frequencyrange:

Usablesensitivity(S/N=20dB):

522-1620KHz(EUROPEMODEL)
530-1710KHz(USAMODEL)
30dBμ

DiscPlayer

System:
Frequencyresponse:
Signal/noiseratio:
Totalharmonicdistortion:
Wowandflutter:
Channelseparation:

Note:Specificationsanddesignaresubjecttochange

withoutnoticeforproductimprovements.

Discdigitalaudiosystem
20Hz-20kHz
>86dB
Lessthan0.20%(1kHz)
Belowmeasurablelimits
>60dB

MEASUREMENTSETUP

TunerFM

1-3

Bandpass

250Hz-15kHz

e.g.712270748001

LFVoltmeter

e.g.PM2534

S/Nanddistortionmeter

e.g.SoundTechnologyST1700B

RFGenerator

e.g.PM5326

DUT

Useabandpassfiltertoeliminatehum(50Hz,100Hz)anddisturbancefromthepilottone(19kHz,38kHz).

TunerAM(MW,LW)

RFGenerator

e.g.PM5326

DUT

Frameaerial

e.g.712270789001

Bandpass

250Hz-15kHz

e.g.712270748001

LFVoltmeter

e.g.PM2534

S/Nanddistortionmeter

e.g.SoundTechnologyST1700B

ToavoidatmosphericinterferenceallAM-measurementshavetobecarriedoutinaFaradayscage.
Useabandpassfilter(oratleastahighpassfilterwith250Hz)toeliminatehum(50Hz,100Hz).

CD

UseAudioSignalDiscSBC429482239730184
(replacestestdisc3)

DUT

L

R

S/Nanddistortionmeter

e.g.SoundTechnologyST1700B

LEVELMETER

e.g.SennheiserUPM550

withFF-filter

'

HANDLINGCHIPCOMPONENTS

GENERAL DISMOUNTING MOUNTING

e.g.WELLER
SoldertipPT-H7

SOLDERWICK
482232140042

CHIP

SOLDER

COMPONENT

GLUE

SOLDER

COPPERTRACK

P.C.B

SOLDERWICK

1-4

VACUUMPISTON

SOLDERING
IRON

SOLDERING
IRON

e.g.APAIROFTWEEZERS

HEATINGHEATING

SOLDERING
IRON

482239510082

CLEANING

A

B

C

e.g.APAIROFTWEEZERS

SLODER

Φ0.5-0.8mm

SLODERING

IRON

SLODERINGTIME
<3secretary/side

PRESSURE

Φ0.5-0.8mm

PRESSURE

EXAMPLES

SOLDER

SLODERING

IRON

A

B

SERVICEPACKAGE

SOLDERING
IRON

SOLDERING
IRON

PRECAUTIONS

CORRECT

COPPERTRACK

CHIPCOMPONENT

CORRECT

SOLDERING
IRON

NO！

GB

WARNING

AllICsandmanyothersemi-conductorsare
susceptibletoelectrostaticdischarges(ESD).
Carelesshandlingduringrepaircanreducelife
drastically.

Whenrepairing,makesurethatyouare
connectedwiththesamepotentialasthemass
ofthesetviaawristwrapwithresistance.
Keepcomponentsandtoolsalsoatthis
potential.

F

ATTENTION

TouslesICetbeaucoupd'autres
semi-conducteurssontsensiblesaux
dechargesstatiques(ESD).
Leurlongevitepourraitetreconsiderablement
ecourteeparlefaitqu'aucuneprecautionn'est
prisealeurmanipulation.
Lorsdereparations,s'assurerdebienetrerelie
aumemepotentielquelamassedel'appareilet
enfilerlebraceletsertid'uneresistancede
securite.
Veilleracequelescomposantsainsiqueles
outilsquel'onutilisesoientegalementace
potentiel.

1-5

ESD

D

WARNING

AlleICsundvieleandereHalbleitersind
empfindichgegenuberelektrostatischen
Entladungen(ESD).
UnsorgfaltigeBehandlungimReparaturfallkan
dieLebensdauerdrastischreduzieren.
VeranlassenSie,dassSieimReparaturfalluber

einPulsarmbandmitWiderstandverbunden
sindmitdemgleichenPotentialwiedieMasse
desGerates.
BauteileundHilfsmittelauchaufdiesesgleiche
Potentialhalten.

NL

WAARSCHUWING

AlleIC'senveleanderehalfgeleiderszijn
gevoeligvoorelectrostatischeontladingen
(ESD).
Onzorgvuldigbehandelentijdensreparatiekan
delevensduurdrastischdoenverminderen.
Zorgervoordatutijdensreparatieviaeen
polsbandmetweerstandverbondenbentmet
hetzelfdepotentiaalalsdemassavanhet
apparaat.
Houdcomponentenenhulpmiddelenookop
ditzelfdepotentiaal.

AVVERTIMENTO

I

TuttiICeparecchisemi-conduttorisono
sensibiliallescarichestatiche(ESD).
Lalorolongevitapotrebbeesserefortemente
ridattaincasodinonosservazionedellapiu
grandecauzioneallaloromanipolazione.
Duranteleriparazionioccorrequindiessere
collegatoallostessopotenzialechequellodella
massadell'apparecchiotramiteunbraccialetto
aresistenza.
Assicurarsicheicomponentieanchegliutensili
conqualisilavorasianoancheaquesto
potenziale.

ATTENTIONGB

Safetyregulationsrequirethatthesetberestoredtoitsoriginal
conditionandthatpartswhichareidenticalwiththosespecified,
beused.

NL

Veiligheidsbepalingenvereisen,dathetapparaatbijreparatiein
zijnoorspronkelijketoestandwordtteruggebrachtendatonderdelen,
identiekaandegespecificeerde,wordentoegepast.

F

LesnormesdesecuriteexigentqueI'appareilsoitremisaI'etat
d'origineetquesoientutiliseeslespiecesderechangeidentiques
acellesspecifiees.

D

BeijederReparatursinddiegeltendenSicherheitsvorschriftenzu
beachten.DerOriginalzustanddesGeratsdarfnichtverandertwerden;
furReparaturensindOriginal-Ersatzteilezuverwenden.

I

LenormedisicurezzaesigonocheI'apparecchiovengarimesso
nellecondizionioriginaliechesianoutilizzatiipezzidiricambio
identiciaquellispecificati.

Pourvotresecurite,cesdocuments
doiventetreutilisespardesspecia­listesagrees,seulshabilitesareparer
votreappareilenpanne.

CLASS1

LASERPRODUCT

GB

Warning!

Invisiblelaserradiationwhenopen.
Avoiddirectexposuretobeam.

S

Varning!

Osynliglaserstralningnarapparatenaroppnadochsparren
arurkopplad.Betraktaejstralen.

SF

Varoitus!

Avatussalaitteessajasuojalukituksenohitettaessaoletalttiina
nakymattomallelaserisateilylle.Alakatsosateeseen!

312211003420

Afterservicingandbeforereturningsettocustomerperforma
leakagecurrentmeasurementtestfromallexposedmetalpartsto
earthgroundtoassurenoshockhazardexist.Theleakagecurrent
mustnotexceed0.5mA.

DK

Advarse!

Usynliglaserstrlingvedabningnarsikkerhedsafbrydereer
udeaffunktion.Undgaudsaettelseforstraling.

a

PREPARATIONS

WiringDiagram

1-6

Antenna

Subwooferout

(Green)

ISOconnector

Fuse15A

Connector

Line-outGray(Rear)

Line-outBrown(Front)

R(Red)

L(White)

R(Red)

L(White)

ACC+/red

AutoAntenna/blue

Battery12V(+)/yellow

Ground/black

1-7

CONTROLS

PowerOn:Pressanybuttononthepanelexcepttoturnontheunit.

MP3 track+10 up

MP3 track-10 down

Track Random play

Track Repeat play

Intro play(10sec)

more than 2 sec.)

Top play ( press

Play / Pause

1-8

REMOTECONTROLS

PowerOn:Pressanybuttonontheremotecontroltoturnontheunit.

Poweron/off

Mute

PushtoselectVOL/BAS/

TRE/BAL/FAD,useVolume

buttontoadjustlevel

Pushmorethan2seconds

toMenumode

MP3track/file/character

search

ESP(CD40s,MP3120s)≥≥

(Optional)

Rotatethecontroltochoosefront

panelbuttonilluminationcolor.

Play/Pause

Topplay(press

morethan2sec.)

Introplay(10sec)

TrackRepeatPlay

TrackRandomPlay

MP3track-10down

MP3track+10up

TrafficAnnouncements

Identification

DiscPlayback

RadioPreset

Presstotunein

apresetstation

Holdformore
than2seconds
tostorestation.

Volume

MUTE

VOL

SEL

MENU

TAPTY

AF/REG

/

TOP

RadioTune

TrackSeek

65

SRC

AMS

SEARCH

BAND

4321

RDMRPTINT

DISP

SEARCH

BandSwitch

ProgramType

Displayswitch

AMS

MP3track/file/character

AlternativeFrequencylist

REG(Region)mode

Radio

Auxin(optional)

DiscPlay

(whendiscisin)

RadioPresetscan

RadioAutoPreset

search

FM1

FM2

FM3

OIRT

AM1

AM2

Replacingthelithiumbatteryofremotecontrolunit.

*Whentheoperationrangeofthecardremote

controlbecomesshortornoProperly,replace
thelithiumbatterywithanewone.Makesure
thebatterypolarityreplacementiscorrect.

1.Pulloutthebatteryholderwhilepressingthestopper.

2.Insertthebutton-typelithiumbatterywiththe
markfacingupward.

Insertthebatteryholderintothe

remotecontrol.

(CR2025)

(+)

WARNINGS:

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.

CONTROLS

1-9

DiscEject:

Presstoslidedownthepanel.
Ifthereisadiscinside,thediscwillbeejectedautomatically.
Insertthediscintotheslot.Thepanelwillcloseautomatically.

Load:
Panelslide
down/close:

Donotapplyexcessiveforcetothepanel,doingsocancausedamagetotheunit.
Donotpresstoclosethepanelbeforethediscisinsertedcompletely,

doingsomaydamagethediscandtheunit.

Presstoslidedownthepanel.
Pressagaintoclosethepanel.

Radio: RadioTunebystep:presslessthan0.5sec.

RadioSeekautomatically:pressmorethan0.5sec.

DiscPlayback:

Trackskip:presslessthan0.5secondtogotothenextorprevioustrack.
Trackseek:pressmorethan0.5secondandholdittofastforwardorreversebackthetrack.

AMS:AutoMemoryStore

Pressbrieflytoscanthepresetstationfor5secondseach.Holdmorethan2seconds,the6
strongestavailablestationwillbeautomaticallysavedinthememoryofpresetbutton.

AMS

SETCLOCK

PressDISPbutton,timedisplays.Pressagainmorethan2seconds,timedisplayblinks.
Rotatetheknobclockwisetosethours.Rotatetheknobanticlockwisetosetminutes.

Pressthebuttonmorethan2secondstoentermenumode,theneachpresschangesthemodeasfollows:

DN

TAmodeMASKmodeDSPmodeLOUDON/OFFmodeESPmodeBEEPON/OFF

VOL

UP

VOLmode

COLORmode

(onlyintunermode)(onlyinFMmode)

DISP

(CD40s,MP3120s)≥≥

SEEK1/2modeST/MOmodeLOCAL/DXmode

(onlyintunermode)

DN

UP

TAmode:RotatetheknobtochooseTAALARMorTASEEKmode,WhenTAisturnedonandnotrafficprogramidentificationcode

hasbeenreceivedduringthespecifiedtime,noTA/TPisdisplayedandaccordingtotheMENUSELECT,alarmissetoff,

orTASEEKisactivated.

TAALARMmode :NOTA/TPisdisplayedandalarmissetoff. TASEEKmode:TASEEKisactivated.

ALBUM

MUSIC

ARTIST

ALBUM

MUSIC

ARTIST

VOL