7. Troubleshooting (Continued)
7-2 Electrical Malfunction
SYMPTOMCAUSECORRECTIONS
Oven is dead1. Open or loose lead wire harnessCheck wire harness
Main Fuse is OK.2. Open thermal cutout switchCheck magnetron or cavity thermal
No display and no operation(magnetron, cavity)cutout switch is defective.
3. Open fuse(5A)Check Ass?y Sub P.C.B
4. Defective Ass?y inverter P.C.BReplace Ass?y inverter P.C.B
No display and no operati1.onShort MOSFETReplace Ass?y Inverter P.C.B
Main Fuse blown out2. Mismatch +, - polarity battery powerRcaeplbleace Main Fuse
3. Defective monitor switchCheck adjustment of primary,
4. Shorted battery power cablemonitor, door sensing switch
5. Shorted High voltage components (NOTECh2e)ck battery power cable
Replace Ass?y inverter P.C.B
NOTE 1 : Check continuity power relay contact and if it has not continuity,
replace power relay also.
NOTE 2 : When Ass?y Inverter P.C.B is replaced, check magnetron also.
Oven does not accept key1. Shorted or open tact switch.
input2. Defective secondary latch switch (NOTE 1)
3. Defective Ass?y P.C.BReplace P.C.B main
Timer Starts countdown but1. Defective high voltage componentsCheck high voltage component
no microwave oscillation.2. Defective primary latch switchaccording to component test
(No heat while oven lamp3. Open wire harness or terminalprocedure and replace Ass?y
and fan motor turn on)inverter P.C.B if defective
Check adjustment of primary switch
Reconnect
1. Open wire harness or terminalReconnect
"nC"message
2. Defective Ass?y inverter P.C.BReplace Ass?y inverter P.C.B
Check high voltage components
according to component test
"oC"message1. Shorted high voltage component
procedure and replace Ass?y
inverter P.C.B if defective
Check EEPROM and replace P.C.B
"nA","CE"message1. Defective P.C.B main
main if defective |
ACEC
