Sanyo PLC-EF31 Service Manual

Also see for PLC-EF31: Owner's manual Service manual

-26-ASS'Y POWERHot circuitAC-INPUTCPU IC801andI / OEXPANDERIC1831SUB POWERSystem ControlINTERLOCK SWFUSESW902F901DC outWARNINGTEMP.READYPOWER-ON/OFFIIC-SCL & SDAACDC outI / OEXPANDERPOWERCONTROL SWITCHINDICATORSFANON/OFFFANSFANSPOWER-FAILCONTROLLAMPREPLACELAMPAlwaysSwitched16V /9V /6.25V /-6VNOTE : Light source lamp The lamp emits light through arc discharge. To initiate arc discharge, dielectric breakdown must occur betweenthe lamp electrodes. The high-voltage pulse generator generates and applies high-voltage pulses with peak val-ues of about 20kV between the lamp electrodes in order to generate glow discharge. This in turn results indielectric breakdown between the electrodes, causing a shift from glow discharge to arc discharge. After projector turned on, 30 seconds are required until the light output stabilizes. After the projector is turnedoff, the cooling fan operates for 90 seconds to cool down the lamp and reduce gas pressure inside the lamp.During this "cooling down" period, the projector cannot be turned on.CPU : Lamp monitor operation. CPU performs an input check by the lamp monitor pin. When the "H" signal continues 1 second or more continuously,CPU judges the state to be abnormal. When it has detected abnormal condition, CPU turns off a pro-jector compulsorily. And CPU sets up the cooling time for 90seconds. The projector cannot be turned on during a cooling time.NOTE : The ready (green) LED indicates lamp monitoroperation as follows:LED off: Lamp is being cooled.LED on: Lamp is being lit or already cooled down.Isn't the lamp cover of a projec-tor removed?When it is removed, the projectorcannot be turned on.Is the lamp cover attached correctly?And has not the boss(Inner side of thelamp cover) broken?Check the boss and the Interlock switch(SW902).SW902 -- open : AbnormalityLAMP ABNORMALITY -1Troubleshooting