ViewSonic PJ750-2 Service Manual - Page 17
ViewSonic PJ750-2 Manual
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Lamp does not light What is the state of LAMP indicator D302 during operation? Light Change the lamp. Does lamp light? Light Lamp Not light Not light Is the voltage at collector of Q801 on the PWB assembl YES Drive fixed to "L" during warming-up? "L"= OV NO PWB assembly Drive Power unit (ballast) Power unit (circuit) Blinks What is the state of TEMP indicator D301? Connect NO E302 (for PWB assembly Sensor) DC FAN H (3.3V) Is E302 PWB assembly Sensor surely connected with PWB assembly Drive by the cable? YES Measure sure voltage at the of 1256 on the PWB assembly Drive. Not light s the voltage at pin ® of L818 on the PWB assembly Drive NO set to "L" during warming-up? "L" = OV YES PWB assembly Drive L (OV) Power unit (ballast) PWB assembly Infinity Sensor Measure the resistance of TH950 on the PWB assembly Sensor at disconnecting E302. about 10kQ PWB assembly Drive ViewSonic Corporation CONFIDENTIAL -- DO NOT COPY PJ750-2 14
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