Midea MDS70-V032_A0431-EU18-P1 User manual

Service Manual
Dryer
Model:MDS70-V032_A0431-EU18-P1
Note：
Before service the unit, please read this manual first.
Contact with your service center if meet problem

1PRECAUTION………………….………………..……………………………………………………….3
1.1SafetyPrecautions
1.2ServicingPrecaution
1.3 CautionsForSafety
2UNPACKINGWAYSOFMAINPARTS…………………………………………………………..5
3MALFUNCTIONSCODESANDEXPLANATIONS …………………………………...…..12
4 TROUBLESHOOTING………………………………………………………………………..………13
4.1TheControlpanelnotdisplayedafterselectingtheprogram
4.2Thedrumnotworkedafterselectingtheprogram
4.3Maintenancenon‐heatingmalfunction
4.4Drumworked，buttheeffectofdryingisnotgood
4.5Noise
4.6Peculiarsmellappearswhenthedryerisworking
5CHECKPOINTOFCIRCUIT……………………………………………………………….……..17
6SERVICETOOLS……..………………..................................................................18
7 APPENDIX………………………………………………………………………………………..……..19
Contents
2

1Precaution
3
When performing troubleshooting and part replacement during servicing, note the following safety
precaution.
1‐1.Safety Precautions
1‐1‐1.Use Genuine Parts
The components of the Tumble Dryer machine have safety features such as non‐combustibility and
voltagewithstanding.Therefore,alwaysusethesamepartassuggestedbythemaker.Inparticular,
be sure to use only designated parts in case of major safety parts identified by the marker.
1‐1‐2.Grounding
Connect the grounding wire to the shell plate, and bury it under at least 25cm of earth:
alternatively, connect the ground wire to the appropriate pin on a properly grounded power
receptacle. Never connect the wire to a telephone line, lightning rod, or gas pipe.
1‐2.ServicingPrecautions
1‐2‐1.ObserveWarnings
Besuretofollowspecialwarningandprecautionsthataredescribedonpartlabelsandinthe
owner’smanual.
1‐2‐2.PartsAssemblyandwiring
Besuretouseinsulationmaterial(suchastubeandtape).Andbesuretorestoreallpartsandwires
totheiroriginalposition.Takespecialcaretoavoidcontactwithsharpedges.
1‐2‐3PerformSafetyChecksafterServicing
Afterservicing,checktoseethatthescrews,parts,andwiringarerestoredtotheiroriginal
positions,andchecktheinsulationbetweentheexternalmetalsandthesocketplug.Inaddition,
placetheTumbleDryer machineinalevelposition(lessthan1(one)degree)topreventvibration
andnoiseduringoperations.
1‐2‐4.InsulationChecks
Pullouttheplugformthepowerreceptacle,pourwaterintothespintub,andthensetthetimer.
Checktoseethattheresistanceinsulationbetweentheterminalsoftheplugandtheexternally
exposedmetalisgreaterthan1M.
Note:Whenitisimpossibletoperforminsulationcheckwitha500Vinsulationresistancetester,
useothertestersforinspection.

1.3 CautionsForSafety
Symbol Meaning
WARNING
Indicatespossibilityofdeathorseriousinjuryofarepairtechniciananda
personnearbythroughthemisconductedwork,orofauserbyadefectof
the
productaftertheworkperformedbythetechnician.
CAUTION
Indicatespossibilityofinjuryorphysicaldamages*ofarepairtechnicianand
apersonnearbythroughthemisconductedwork,orofauserbyadefectof
theproductaftertheworkperformedbythetechnician.
GraphicSymbol Meaning
Caution:Read theoperator’smanualbeforeusingthisproduct!
caution,hotsurface
caution,riskoffire
UNPLUG
POWER
Unplugpowercordfortheworksuchasdisassemblingwhichisnot
unnecessarytopoweron.Donotholdtheplugbyawethand.Failingto
unplugmaycauseanelectricshock.
•Pleaseobservethefollowingnotesforsafety.
•Thesymbolsindicateasfollows.
4
1Precaution

5
OrdinaryInformation
1.Pleaseunplugthepowercordwhenyoudisassembleormaintaintheproduct；
2.Pleaseusetheregulationconnectorlugbetweenthewiresasmuchaspossible.Thencrimp
themfirmly bythepropertoolsandbundlethembytheinsulatingtape;
3.Whenyouplugthewires,pleaseinserttheplugtothebottomsoitisnoteasilytobe
unplugged;
4.Makesurethatthewirescannottouchthemobilepartsuchlikethedrum,andalsocannot
touch thesharp/hard‐edgedpartyandhigh‐heatpart(motor);
5.Pleasepreservethescrewswhenyoutakethemdown.Youwillusethemwhenyouinstall
thedryer;
66.ometimesyoumustoperatethedryerwhenitiselectriferous.Inthiscase,youmustbe
carefuland payattentiontotheelectricshock.
2UnpackingWaysOfMainParts

6
2UnpackingWaysOfMainParts
Stepsofdisassemblingmachine Pictures
1.Removethetopcovercomponentsofthecase
(1)Removethescrewcap;
(2)Removethescrewsfixedroofcomponent;
(3)Takeouttheroofcomponent.
2.Removethebackboardcomponentofthecase
(1)removethescrewsfixedbackboard;
(2)removethescrewsfixedthermostatsupport
component;
(3)pulledoutwireharnessassemblyandLinefirmand
terminalconnectedwithbackboard;
(4)takedownthebackboardcomponent.
2‐1.Removedthebackventflange
2‐2.Removethepowerline

7
Stepsofdisassemblingmachine Pictures
2‐3.Removethefilter
3.removethedoorcomponent(includingthedoor
hinge)
(1)removethescrewsfixeddoorhinge;
(2)takedownthedoorcomponentandhinge.
3‐1.removethedoorhinge,frontdoorandback
doorframe
4.Removetheinnertubassey
(1)Removethereinforcedplate;
(2)takeoutthebeltfromthemotorshaft;
(3)removedthescrewswhichisfixeddrumkitand
the
automaticthermostat;
(4)pullouttheterminalconnectedwirewithheating
pipe;
(5)takeoutthedrumkitandthebelt.
4‐1.Removethebodyofdrum,liftingbar,heating
pipe
coveranddrumshaft,etc
4‐2.Removetheheatingpipe,heatingpipecover
andits
Support
2UnpackingWaysOfMainParts

8
Stepsofdisassemblingmachine Pictures
5.Removethecontrolpanelcomponent
(1)removedthescrewsfixedcontrolpanelcomponent;
(2)PullouttheterminalsconnectedwirewithPCBboard.
5‐1.Removethecontrolpannel,PCBboardandbuttons,
etc.
6.Removethewiringharness(includingthethermostat)
(1)removeallthelinefirmfixedwires;
(2)pullouttheterminalsconnectedthewireswiththe
motorandthedoorswitch;
(3)takeoutthewires.
6‐1.Removetheautomaticthermostat
6‐2.Removethesupportcomponentsofthemanual
Thermostat
6‐3.Removethemanualthermostat
2UnpackingWaysOfMainParts

9
Stepsofdisassemblingmachine Pictures
7.Removethefrontplateassembly
(1)removethescrewsfixedfrontplateassembly;
(2)takeoutthefrontplateassembly
7‐1.removethedoorswitchplate
7‐2.Removethesupportcomponentsofthedrum
7‐3.Removethedoorgasketandfrontplate
8.Removethesideplatesandbaseassembly
(1)removethescrewsfixedsideplates;
(2)takeoutthesideplatesandbaseassembly.
8‐1.Removethefrontairduct
2UnpackingWaysOfMainParts

10
Stepsofdisassemblingmachine Pictures
8‐2.Removetheimpeller
8‐3.Removethefixd blockofthemotor
8‐4.Removethefixd statorofthemotor
8‐5.Removethetightspring
8‐6.Takeoutthemotorcomponents
8‐7.Removethecapacitance
2UnpackingWaysOfMainParts

11
Stepsofdisassemblingmachine Pictures
8‐8.Removethemotorbracket,
Bottomplateandtheair duct
P1 Motor
P2 Doorswitch
P3 Heatingpipe
P4 Temperaturesensor
P5 Powercord
2UnpackingWaysOfMainParts
P1
P3
P2
P4
P5

12
3MalfunctionsCodesAndExplanations

13
4Troubleshooting
4.1TheControlpanelnotdisplayedafterselectingtheprogram
NO
WhetherthePCBhas
alarmornot whetherthestrap breakoff
Changethestrap
Whethertheconnection
iswellornot
Whetherthe
connection
isshortornot
Changethemotor
whetherthespringis
well
Changethespring
Changetheconnection
whethertheaxesis
breakoffornot
Changetheaxes
Whetherthedooris
closedwellornot losethedoororchange
thedoorlock
whetherthemotor
wrecked
4.2Thedrumnotworkedafterselectingtheprogram
NO NO
NO
NO NO
YES
YES
YES
YES
YES YES YES
Changethe PCBkit
checkthefuse
checkwhetherthe
wiringharness
assemblewellornot
whetherThefilteris
wellornot
reliabletheconnection
NO
Whetherthepower
sockethasvoltageor
not
YES
Whetherthe both
endsof CN1
connectorJack
hasvoltageor not
NO
NO
Changethe filter
YES
YES
YES

14
Whetherthethermostatis
wellornot Whethertheheateriswell
ornot
Tochoosethenewprogram
Reliableconnection
Whethertheconnect
ofheateriswellor
not
Whetherthethermostat
thermostatis
wellornot
cleanthefilterlint
Whethertheunderprop
wasblock
cleantheunderprop
WhethertheImpeller
iswellornot
makesurethevolume
ofclothesisnomore
Whetherthefilterlint
4.3Maintenancenon‐heatingmalfunction
Whethertosetupnon‐
heating
NO
Whethertheconnectof
heater、thermostatand
PCBpaneliswellornot
NO
YES
YES
NO
YES
Changethethermostat
4.4Drumworked，buttheeffectofdryingisnotgood
NO
YES
Whetherthevolume
ofclothesismore
than6kgornot
NO
connectpowercord,
Choosethecotton
program,Whetherthe
heaterisheatingor
NO
havebeencleanedin
time
NO
Changetheheater
YES
YES
NO
Changethethermostat
ChangetheImpeller
YES
4Troubleshooting

15
4.5Noise
twisttheScrew
adjusttheaxialpositionof
Underpropwheel
changeTubshaft
changePulleySpring
changeMotorsupportor
changeMotor
changeImpellerinstall
Impelleragain
changeBearingblock
installDrain‐hoseandthe
Overflow‐tubeinpipecatch
Checkthesourceofvoice
WhethertheScrewwhich
YES
YES
YES
YES
connecttoTubwrapandlifter
isloose,causetheScrewand
theSideplates
NO
WhethertheUnderpropwheel
NO
WhethertheTubshaftis
breakoff
NO
WhetherthePulleySpringis
invalidation
NO
WhethertheMotorsupport
installMotorsupportagain
NO
WhethertheMotorfriction
oroscillationistoobig
NO
WhethertheImpellerwas
brokeorbrokeoff
NO
WhethertheBearingblock
theTub shaft
NO
WhethertheDrain hoseand
theOverflow tube‐chafethe
Side‐board
YES
YES
YES
YES
YES
4Troubleshooting

16
4.6Peculiarsmellappearswhenthedryerisworking
Whethersomethingburning
inheater
NO
Whetherthemotorblocked
NO
Whetherthebeltslidingor
wearleadingtorubberodor
NO
Whetherotherelectrical
componentsbrokendown
YES
YES
YES
YES
Cleanheater
Solvethemotorblocked,if
themotordamaged，it
Replacethebelt
Replacecorresponding
electricalcomponents
4Troubleshooting

Beforerepairing,usemultimeter tojudgecircuitstandoffail.
5CheckPointOfCircuit
17
No Parts parameter
1 MotorAssembly
Measuredwithamultimeter primaryandsecondary
windingsofthemotor.
Mainwinding(white‐blue)30.0×(1±10%)Ω(20℃)
Secondarywinding(white‐ red)30.0×(1±10%)Ω(20
℃)
2 Capacitor Testcapacitancevalueshouldbe9±5%uF
3Thermostat
Withamultimeter totesttheconnectionatbothends
areeachturnedon.ConductingOK,thereplacementis
notturnedon.
4Temperaturelevel
Sensor
Measuredacrosstheresistorwithamultimeter,the
resistancelinewithRTtable.
Accordingtotheprevailingambienttemperature
determination,error±3℃.
5℃:25KΩ
10℃:20KΩ
15℃:15.5KΩ
20℃:12.5KΩ
25℃:10KΩ
30℃:8KΩ
35℃:6.5KΩ
5Electricfilter
Withamultimeter totesttheconnectionatbothends
oftheNandLareeachturnedon.ConductingOK,the
replacementisnotturnedon
6 Heater Testresistancevalueshouldbe29±10%Ω

18
Number Tools Suitablekit
1Sleeve(13#) and spanner
Drumtubassembly
Capacitance
2 Sleeve(14#)andpliers Impeller
3Othertools
(screwdriver,pliers andsoon) Commonservicetools
13# 14#
5ServiceTools

19
7Appendix
19
Machinefunctiondescription,programdescription,thewholedetailedparametertable,
faultcodes,etc.Pleaserefertotheinstructions.
Note:Thescheduleforthereferencevalue.
MDS70-V032_A
0
31-EU18-P1说明
书

20
Theend!