Sanyo PLC-WM5500 Service Manual

Also see for PLC-WM5500: Owner's manual Brochure Manual Manual Owner's manual

Contents

-71-TroubleshootingTemperature monitor operationThe temperature monitor system is provided to preventsdamage of optical components inside a projector fromoverheat. Two protection systems are provided. Eachsystem operation as follows :The temperature monitor -1:● To control the air-flow of the cooling fans.The CPU checks the temperature and atmosphericpressure inside a projector. It checks a temperatureusing temperature sensors IC1692, IC1814, IC1816and it checks an atmospheric pressure using pres-sure sensor IC886. The CPU judges data from sen-sors and controls the air flow of the cooling fans sothe temperature inside the projector is maintained tonormal temperature.● To shut down the projector urgently.The CPU checks surrounding temperature of LCDpanel (IC1814), Lamp (IC1816) and intake air (IC1692).If each part temperature reaches abnormal tempera-ture, the CPU will turn off the projector, and will blinkWARNING TEMP. indicator. Cooling fans operate untiltemperature returns to normal. Indicator will stop blink,if temperature returns to normal.The temperature monitor -2 :● Temperature check of lamp :Thermal protector (SW902) is placed near the lamp.Thermal protector will operate, if the surrounding tem-perature reaches 115ºC. When the thermal protectorbecomes open, it cuts off the AC line to shut down theprojector immediately.The sensor's operation is as follows:IC886 : Pressure sensor for FAN controlIC1692 : Inside temperature monitor A (room)IC1816 : Inside temperature monitor B (lamp)IC1814 : Inside temperature monitor C (panel)Temperature AbnormalitySW901IC301SYSTEMCONTROL&SCANCONVERTERIC5201FPGALAMPLP900ACSW902THERMALPROTECTORA902POWERA901LAMPBALLASTQ1861CHO_RXDFILTER_DETWINDS_SENSQ331CHO_TXDPW_MASTER_SDIPW_MASTER_SDOPW_MASTER_SCKLAMP_DC_ONIC1853INVERTERIC1816TEMPSENSOR BIC886PRESSSENSORIC1692TEMPSENSOR AS901WINDSENSORIC1814TEMPSENSOR CIC9885SUB-MICONIC7801DACFANCONTROLLAMPCOVER SW.1 23215425115144134368281161129295 1 45 1 431K8RK6RCJ1CJ2K6BRL601LF601 K6AK8KK8BK8EK8GK8S35879POWER-ON:HNetwork Standby: HEco Standby: LPOWER-ON:HError: LError: LMAINSW1891K8CFILTER SW.31LAMP_SWIN10 POWER_SWLOWPOWERSUPPLYPOWERSUPPLYSB_5VS16VS6VS-6VS3.3VPRESS_SENSPW_SDA0/SCL0PW_SDA0/SCL0F601FUSEFAN LOCKP.FAILCOOLINGFANSSW902 opens at 115ºC.WARNING TEMP. indicator blinks