Sanyo PLV-Z700 Service Manual

Also see for PLV-Z700: Brochure Owner's manual

Contents

- 79 -● Description of Fan control circuitFan control circuitThe Fan drive power supplies "FAN1", "FAN2", "FAN3", "FAN4" and "FAN5" are generated from "S16VF". Each power supplydrives fans as follow;FAN1 ........FN901 for power and ballast exhaustFAN2 ........FN902 for lamp coolingFAN3 ........FN903 for lamp exhaustFAN4 ........FN904 for intake and panel coolingFAN5 ........FN905 for intake and panel coolingThe fan spinning speed is controlled by "FAN_CTL0", "FAN_CTL1", "FAN_CTL2" and "FAN_CTL3" from pins 65,176,66 and 177of IC301.Power failure protection of FanThe alarm output signals(PWM signals) from the fans are connected to IC4401(Color Manager) and IC4401 monitors the fanspinning speed for safety.When an abnormality occurs on any one of the fans, for example the fan spinning speed is lower than the specified speed,IC301 shuts down the projector. If a fan connector is not connected firmly, IC301 also shuts down the projector.Temperature sensor for Fan controlTempA - TH902 around the intake fan "FN904"and "FN905" for outer temperature of the projectorTempB - IC8841(side the lamp) on the Main board for optical partsTempC - TH901 on the polarized glass (IN-B) for panel and polarized glass temperatureThe temperature sensors measure surrounding temperature and sends data to IC301. IC301 controls the proper fan spin-ning speed based upon these temperature data. Also, when a temperature rises over a specified value, IC301 judges thatthere is abnormal internal temperature and turns off the projector.The fan spinning speed is controlled withthe temperature and the lamp power.FAN SPEED [rpm]TEMPERATURE [ºC](Max. FAN Spinning Speed)(Min. FAN Spinning Speed)(Min. Setting Temperature) (Max. Setting Temperature)(Shutdown Setting Temperature)FAN SPEED [rpm]Lamp mode = NORMAL/ECOLamp mode = AUTOTEMPERATURE [ºC](Min. Setting Temperature)(Max. Lamp Power)(Min. Lamp Power)(Max. Setting Temperature)(Shutdown Setting Temperature)Temperature vs Fan spinning speedChassis Block Diagrams