ViewSonic PJ750 Service Manual - Page 16
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Lamp does not light What is the state of LAMP indicator during operation? Not light Light Change the lamp. Does lamp light? Light Lamp Not Light Is the voltage at L817 on the PWB ass'y Main YES fixed to "L" during warming- "L"= 0V NO PWB ass'y Main Power unit (ballast) Power unit (circuit) Connect E302 (for PWB NO ass'y SENSOR) Blinks Is PWB ass'y SENSOR surely connected with PWB ass'y Main by the cable? YES What is the state of TEMP indicator? Not light Is the voltage at L818 on the PWB ass'y Main NO set to "L" during warming- "L" = OV DC FAN H (3.3V) Measure sure voltage at the(Dof 1303 on (INTAKE NB) the PWB ass'y Main. YES PWB ass'y Main L (0V) Power unit (ballast) PWB ass'y SENSOR Infinity Measure the resistancne of TH950 on the PWB ass'y SENSOR at disconnecting E302. about 10kO PWB ass'y Main ViewSonic Corporation 13 CONFIDENTIAL -- DO NOT COPY PJ750
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