LG RCS10MPA Service Manual - Page 32

Display shows all s set, but oven does not start cooking while desired

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(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired (TROUBLE 3p) rDoigspralamy tsimhoewssaarell sfiegtuarnesd sSeTtA, bRuTt poavdenisdtooeuscnhoetds. tart cooking while desired program times are set and START pad is touched. CONDITION CONDITION 1. Setting time d1o. eSsetntiontgctoimunet dowdonewshneont count toudcohwinng wShTeAnRT padto. uching START pad. CHECK CHECK Check continuity of Csehceocnkdcaornytinuity swoitfcshe(cwonithdary dosowr ictclohs(ewdi)th. door closed). RESULT RESULT No continuity. No continuity. Continuity. Continuity. CAUSE CAUSE Defective seDceofencdtaivrye switch. secondary switch. REMEDY REMEDY Replace sReecopnladcaery switch. secondary switch. CnCaaenshNCnCaascde1ensethNciPscdomeck1etCncoiPbomtcknBhlbCnoybnetenB.hlbeytncewec.oettecwoncoert-eonner-n CoCnotnintiuniutyity NoNococnotnintiuniutyity DasDaessfeeesfeecmtcmibvtiblevyley.P.PCCBB LoLooosesecoconnnneecctitoionn. . RaRasesespsepleamlamccbebelylPyP..CCBB CtiCtgiogohnhntnltynley.e.cctttthheemm 2. B2lo. wFaenr mmoottoorr or or oovveennlalammpp do do nnoott ttuurrnn oonn.. CheCckhebclokwfaenr mmoottoorr.. CheCckheocvkenovlaemn lpa.mp. AbAnbonromrmalal AbAnbonromrmalal DefDeectfievcetivbelofwaenrmmoototor.r. DefDeectfievcetivoeveonvelanmlapm. p. ReRpleapcleacbelofawnermmotootro.r. ReRpleapcleacoevoevnelnamlapm. p. NoNromrmalal (TR(TORUOBULBELE4)4O) vOevnenseseemems stotobebeopoepreartaintinggbbuut tliltittltelehheeaat tisispprorodduucceeddininoovveennllooaadd.. COCNODNIDTITOINON CHCEHCECKK RREESSUULLTT CCAAUUSSEE RREEMMEEDDYY OuOtpuuttpiustloiswlow ChCehcekctkhethe popwoewresrosuorucerce vovltoalgtaeg.e. LoLwoewretrhtahnan909%0%ofof rartaintgingvovlotaltgaeg.e. NoNromrmalal DisDcisocnonnencet ctht ethe wirweirleealedasdfsrofrmom relraeyla3y 2 and ancdhcehcekcokn and off ontiamnedwoiftfhtime witmhumltiuteltsitteesr.ter. AbAnbonromrmalal NoNromrmalal DDecercereaaseseininppoowweer r sosuorucrecevovoltlataggee wwithithloloaadd. . DDefeefectcivtievePPCCBB asasesemmbblyl.y. SSuuggggeesst t ccuussttoommeerr ccoonntataccttloloccaall eelelecctrtricicppoowweerr uutitliiltiytyccoo..oorr qquuaalilfiifeiedd eelelecctrtriciciaiann.. RReepplalacceePPCCBB aasssseemmbblyly.. MeMaesausreurtehethe ouotpuutpt uptopwoewr.er. AbAnbonromrmalal DDefeefectcivtieve mmagagnneetrtoronn. . RReepplalaccee mmaaggnneetrtroonn.. NONTOET:ES:imSpimleptleesttesotf opfopwoewreoruotpuutpt-ucto-cnodnudcutcetdedbybyhehaetaintigngonoenelitleitrerwwataetrerfofor roonneemminin. .ififaavvaailialabblele.. MinMiminuimmum8.58°.C5¡tCemtepmepraetruartuerreisreisiesinsonromrmalaclocnodnidtiiotino.n. 5-14

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5-14
CONDITION
CHECK
RESULT
CAUSE
REMEDY
1. Setting time
does not count
down when
touching START
pad.
2. Fan motor or
oven lamp do
not turn on.
No continuity.
Continuity.
Continuity
Defective PCB
assembly.
Loose
connection.
Replace PCB
assembly.
Connect them
tightly.
No continuity
Abnormal
Check fan motor.
Defective fan motor.
Replace fan motor.
Abnormal
Normal
Check oven lamp.
Defective oven lamp.
Replace oven lamp.
Defective
secondary switch.
Replace
secondary switch.
Check continuity
of secondary
switch (with
door closed).
Check the con-
nection between
CN1 connector
and PCB
assembly.
(TROUBLE 3)
Display shows all figures set, but oven does not start cooking while desired
program times are set and START pad is touched.
(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.
NOTE :
Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5¡C temperature rise is normal condition.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Output is low
Lower than 90% of
rating voltage.
Normal
Abnormal
Defective PCB
assembly.
Replace PCB
assembly.
Normal
Abnormal
Measure the
output power.
Defective
magnetron.
Replace
magnetron.
Decrease in power
source voltage
with load.
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Check the
power source
voltage.
Disconnect the
wire leads from
relay 2 and
check on and off
time with
multitester.