LG RCS10MPA Service Manual - Page 33

CONDITION, CHECK, RESULT, CAUSE, REMEDY, TROUBLE 5, No microwave oscillation even though oven lamp

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(TROUBLE 5) No microwave oscillation even though oven lamp and blower motor run. (TROUBLE 5()DNisopmlaiycroopwearvaeteosspcrilolapteiornlye) ven though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY CONDITION No microwave oscNilloatmioinc.rowave oscillation. CHECK Disconnect the wreilraDweyiisrlee3caolaednnasnddefsrccotfhrmteohmcek conrteinlauyity2ofarnedlay 3 (Opcehreactke cthoentuinnuiti)ty of relay 2. (Operate the unit) RESULT No continuity. No continuity. Continuity. Continuity. CAUSE Defective PCB DaesfseecmtivbelyP. CB assembly. REMEDY Replace PCB Reapslsaecme PblCy.B assembly. Check high vol- taCgehetrcaknhsifgohrmvoelrtage transformer Abnormal Abnormal Normal Normal Defective high Dveofletacgtieve high vtoraltnasgfeormer. transformer. Replace high Revpollatacge ehigh votlrtaangesformer. transformer. CtahCtgaeehgceeckcackhpaihagpichagichtvoitovro.olr-.l- AAbbnnoorrmmaall NNoorrmmaall DvDvoeoelftleafteacgcgteitevicvecaehaphipagiacghichtoitro.r. RvoeRvlptoaellagptacelageccehaeicpghaahipcgiathocri.tor. ChCehcekckhihgihghvovol-ltatgaegedidoidoed.e. AAbbnnoorrmmaall NNoorrmmaall DDeefefecctitviveehhigighh vvooltlataggeeddioioddee. . ReRpelapclaecheighhigh vovltoalgtaegdeioddioe.de. ChCehcekck mmagangenterotrno.n. AAbbnnoorrmmaall DDeefefecctitvivee mmaaggnneetrtoronn. . ReRpelapclaece mamgangentreotnro. n. NONTOET:E• :M¥aMkaekseusruertehtehewiwreirelelaedasdsccoorrrereccttppoossiittiioonn.. • W¥hWehneRneRmeomvoinvigngthtehewwiriereleleaaddssfrfroommtthheeppaarrttss,, bbee ssuurree ttooggrraassppththeeccoonnnnecetcotro,rn, ontotthtehwe iwreisre. s. • W¥hWehnerneamrneadomnvidoninvingignoggtohotdeohdecmocmanogadngnditneiiteotirotnorno.n.n, ,bbeessuurreettoo iinnssttaallll tthhee mmaaggnneettrroonnggaasskkeet tininthtehecocrorerrcetcptopsoitsioitnion Output is full power Outwpuhet nisyfouull pseotwloewr er whepnowyoeur lseevet l.ower power level. Disconnect the Diswciroenlneeacdtsthfreom wirelaleya2dsanfrdomcheck relcaoyn3tinaunitdy crehleayck2. co(nOtipneuritayterethlaeyu3nit) (Operate the unit) Abnormal. Abnormal. 5-15 Defective PCB aDsesefemcbtilvye. PCB assembly. Replace PCB asRsemplbalcye. PCB assembly.

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5-15
CONDITION
CHECK
RESULT
CAUSE
REMEDY
No microwave
oscillation.
No continuity.
Continuity.
Abnormal
Defective high
voltage
transformer.
Replace high
voltage
transformer.
Normal
Defective PCB
assembly.
Replace PCB
assembly.
Disconnect the
wire leads from
relay 2 and
check continuity
of relay 2.
(Operate the unit)
Check high vol-
tage transformer
Output is full power
when you set lower
power level.
Abnormal.
Defective PCB
assembly.
Replace PCB
assembly.
Disconnect the
wire leads from
relay 2 and check
continuity relay 2.
(Operate the unit)
Abnormal
Defective high
voltage capacitor.
Replace high
voltage capacitor.
Normal
Check high vol-
tage capacitor.
Abnormal
Defective high
voltage diode.
Replace high
voltage diode.
Normal
Check high vol-
tage diode.
Abnormal
Defective
magnetron.
Replace
magnetron.
Check
magnetron.
(TROUBLE 5)
No microwave oscillation even though oven lamp and fan motor run.
(Display operates properly)
NOTE : ¥ Make sure the wire leads correct position.
¥ When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.
¥ When removing the magnetron, be sure to install the magnetron gasket in the correct position
and in good condition.