SiE71-202 TroubleshootingTroubleshooting 471.14 Main Unit PCB AssemblyError DetectionMethodCheck microcomputer operation monitor.Error GeneratingConditionsWhen main unit PCB assembly does not operate.When communication circuit errors.Possible Causes Fuse (excess current)Power transformerNoiseMain unit PCBTroubleshootingMain unit PCBNONONOYESDoes equipmentreset properly.Is it flashing?After checkingother possiblecauses, replacePCB assembly.Is monitor indicatorOff?YESYESMonitor indicator remainsOn.With remote controllerdisconnected, checkmicrocomputer operationmonitor.Turn off power, thenrestart.Noise may be causing erroneousoperation. If power reset does notsolve the problem, replace main unitPCB.There may be a malfunction in mainunit PCB fuse, main unit PCB or powertransformer.Check fuse and transformer. If they arenormal, replace PCB.Replace main unit PCB.(HF013)Exhaustair fanSupplyair fanCN3 CN4CN2CN1CN7FuL 10ACN13CN8CN12CN5 CN6CN9KRP50-2SS1CN11CN10L NHMLP2 P1 F1 F2 J1 J2 JCLED A(HL031)(Microcomputor Operation Monitor)
