DAEWOO ELECTRONICS KQG-6L3B3S Service Manual

DAEWOO ELECTRONICS KQG-6L3B3S Service Manual Manual pdf 20 page image

19(TROUBLE 1) Oven does not operate at all ; any inputs can not be accepted.TROUBLESHOOTING GUIDECONDITION CHECKCheck continuity of interlockmonitor switch with door closedCheck continuity of primaryinter-lock switch contact withdoor partially open untilinterlock mon-itor switchcontact close (COM ↔ NC)Malfunction ofinterlock moni-tor switchShorted con-tacts of primaryinterlock switch.RESULTContinuityNo ContinuityNo ContinuityCAUSE REMEDYReplaceFuse blows.ReplaceDefective lowvoltagetransformer0Ωor infiniteApprox.1.1~1.26kΩ(normal)ReplaceCheck continuity of primarywinding of low voltagetransformerDefective highvoltage capacitorNormal ReplaceDisconnect one side of the leadwire connected of from highvoltage transformer to the highvoltage capacitor and operatethe unitContinuityDefective highvoltagetransformerFuse againblowsReplaceCheck continuity of both primaryand secondary interlock switchwith door colosedMalfunction ofinterlock switchContinuityReplaceNo ContinuityFollowing the procedure below to check if the oven is defective or not.1. Check grounding before trouble checking.2. Be careful of the high voltage circuit.3. Discharge the high voltage capacitor.4. When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these partsand check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.NOTE : When electric parts are checked, be sure the power cord is not inserted the wall outlet.Check wire harness, wiring and connected of the terminals and power cord before check the parts listedbelow.