-79-Troubleshootingdetection of Power failureProjector provides a protection circuit to prevent the secondary failure when the power failure, fans failure or tempera-ture failure occurs on the projector. The power failure detection lines "PF_IC_S3.3V", "PF_LNS", etc. are connectedto the main power supplies. When the failure occurs, IC301 receives an error informationdirectly or through IC4801 and then outputs the signal "LAMP_DC_ON" from pin 32. The signal"LAMP_DC_ON" is supplied to power supply circuit to control the power supply operation.Error information tablePower failure detection systemIc Pin Signal Name connection Lines error Information Failure AreaIC301PW392179 PF_IC_3.3V15.5V, D3.3V_AD, S5VSI, S3.3VSI,S3.3VSH, S3.3V, S1.2VSI, 2.5V_DI,1.8VDDIPF_IC_S3.3V Panel S/H, A/D, Video Select, PanelDrive, Gamma Drive on the Main180 PF_LNS 15V_LNS, 9V_LNS PF_LNS Lens Shift, Zoom, Focus Drive onMain69 PF_12V_ID 12V, S12V PF_12V_ID Audio I/O, Lamp ID on Main282 PF_S-6V_AV S-5V AV, S-6V S-6V, S-5V on Main68 PF_FAN Fans Voltage & Fan Lock PF_FAN S16V Fans Drive and Fan Lock343 FILTER_DET Filter Cartridge Detection FILTER, DET Filter Cartridge DetectionIC4801TE778361 PF_S5V_AV Not used62 PF_MAIN S5V, S5VL,6V PF_MAIN Main S5V, RGB Video, 6V on Main63 PF_5V_MAIN 5V MAIN, 5V 5V on Main64 P_FAIL_LAN 3.3V LAN LAN, 3.3V 3.3V LAN
