Panasonic 1100W - Sharp 1 CF Microwave Service Manual

Trouble Related to Digital Programmer CircuitSYMPTOMNo display when oven is first plugged in.Oven is dead.CAUSE/CORRECTIONSSTEP 2Shorted Circuit of ZNR,L.V.T., Oven Lamp etc.Replace DPCLVT➝ Step 3ZD10, Q10➝ Step 4IC-220➝ IC-1, CX320STEP1234CHECKFuse pattern of DPCLow voltage transformer (LVT)secondary voltageIC-1 pin 8 voltage(Emitter of Q10)IC-1 pin 10 voltage(15 pin of IC-220)RESULTNormalOpen (NOTE)Abnormal 0VNormalAbnormalNormal = 5VAbnormalNormalNOTEProcedure of fuse pattern repairing is as follows:1. When the fuse pattern (PF2) opens.(1) Remove the jumper wire (PF1).(2) Insert the removed jumper wire (PF1) to “(PF2)” position and solder it. If both “PF1” and “PF2” fuse patterns are open, please replace DPC.2. When the fuse pattern (PF4) opens.(1) Remove the jumper wire (PF3).(2) Insert the removed jumper wire (PF3) to “(PF4)” position and solder it. If both “PF3” and “PF4” fuse patterns are open, please replace DPC.NOTE:* At the time of these repairs, make visual inspection of the varistor for burning damage and examine the transformer with tester for the presence of layer short-circuit (check primary coil resistance).If any abnormal condition is detected, replace the defective parts.SYMPTOMNo key inputNo beep soundPower relay A(RY-2) does not turn oneven though the program has been setand the start pad is tappedNo microwave oscillation at any powersettingDark or unclear displayMissing or lighting of unnecessarysegmentH97/H98 appears in window and ovenstops operation. Program High powerfor 1 minute and conduct following testquickly, unless H97/H98 appears andoven stops.RESULTAbnormalNormalAbnormalNormalAbnormalNormal = 5VStill not turn onRY-2 turns onAbnormalNormal5---5V, 15---5VAbnormalNormalNormalAbnormalNormalAbnormal0V0VApprox. AC 3VCHECKMembrane switch continuityIC-1 pin 31 voltageIC-1 pin 32 voltage while operationShort circuit between pin 6 and pin16 of IC-220IC-1 pin 38 and pin 39 voltages whileoperation at high powerQ220 transistorReplace display and check operationReplace IC-1 and check operationUnplug CN702(2 pin) connector andmeasure voltage between terminalsUnplug CN701(3 pin) connector andmeasure pin 1 voltageCAUSE/CORRECTIONSMembrane switchIC-1IC-1BZ, IC-220IC-1➝ Step 2RY-2IC-220IC-1➝ Step 2Q220IC-220, RY-1DISPLAYIC-1IC-1DISPLAYDPCMagnetronSTEP1112121112NEW H.V.TO BE CONTINUED FOR SENSOR MODELSSteam sensor terminal voltage byusing high impedance tester (20k Ω/V), when breathe on metal surface ofsensorAuto sensor cooking does not operatenormally.(Steam Sensor cooking does not detectsteam from foods.)Abnormal = 0VNormal > 10~30mVSteam sensorIC-11- 23 -AC line voltage of 120V2. DPC/Power Relay1. Latch Switch➝ Step 2