Panasonic PT-VX400U Service Manual

Also see for PT-VX400E: Operating instructions Operating instructions

Contents

Panasonic PT-VX400U Service Manual Manual pdf 64 page image

-64-TroubleshootingNo powerLamp Cover switchMake sure that the lamp cover is mounted correctly. If not or the lampcover removed, the lamp does not light on for the safety. Check thelamp cover and lamp cover switch (SW901).- When all of LED indicators are not lighting, the symptom indicates that the primary power supply circuit doesnot operate properly. Check the power primary circuit and parts as follow;AC cord, F601 (Fuse), Power board, SW902 (Thermal fuse)SW902 opens when the surrounding temperature of the switch exceeds 113°C.This projector provides a function which can be specified a defective area simply by indicating the LEDs. Connect theAC cord and press the ON/STAND-BY button once and then check the LED indication.- When the WARNING (red) and POWER (red) indicators are flashing, the symptom indicates that the projectordetected an abnormal temperature risen inside the projector. Check the air filters and remove the object near theintake and exhaust fan openings, and wait until the POWER indicator stops flashing, and then try to turn on theprojector.The internal temperature is monitored by sensor ICs, IC8831, IC8821 on the Main board and IC8811 on the R/Cboard.- When the WARNING indicator lights red, the symptom indicates that the projector detected an abnormality inthe cooling fan operation or in the power supply secondary circuits. Check fan operation and power supply lines,and the driving signal status.The P_FAIL signal (Error: L), FAN_ERR_B signal (Error: L), FAN_ERR_C (Error: H) are sent to pins, 215, 267,and 29 of IC301 respectively when the abnormality occurred inside the projector, andthen the IC301 sends the shutdown signal, LAMP_DC_ON, to the power supply circuit to stop its operation, andsignal SCIOUT to the lamp ballast board via IC9886 and SW901 to stop operation of thelamp circuit.An abnormality occurs on the secondary power supply;Check power supplies S16.5V, S6V, S-7V. P_FAIL signal becomes Low when the abnormality occurs onany of the power supply lines.An abnormality occurs on the fan control circuit;If fans FN901, FN902 or FN903 has an error, the FAN_ERR and P_FAIL signals become "L". If fans FN904or FN905 has an error, the FAN_ERR, P_FAIL and FAN_ERR_B signals become "L". If fan FN906 has anerror, the FAN_ERR_C signal becomes "H".The FAN_ERR signal cuts off the SCIOUT signal which is supplied to the lamp ballast board if the FAN_ERR signal is "L".An abnormality occurs on the drive signals;ON_15V signal (Power-on: H) is output from pin 94 of IC301 and switches IC592,15.5VL supply circuit,ON_3.3V signal (Power-on: H) is output from pin 93 of IC301 and switches IC5621 - 1.0V, IC3852 - 3.3Vsupply circuits.LAMP_DC_ON signal (Power-on: H) is output from pin 89 of IC301 and supplied to the PFC Control IC,IC621, via PC661 on the power supply board. POWER_ON signal (Power-on: H) is output from pin 21 ofIC9885_{and supplied to the oscillator IC, IC631, via PC663 on the power board.}SCIOUT signal (Power-on: H) is output from pin 23 of IC9001 and applied to pin 2 of IC9886 and output pin4 and then supplied to the lamp ballast board through SW901.