Sanyo PLC-WXE46A, Руководство по обслуживанию

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No Power
troubleshooting
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When all of LEd indicators are not lighting
, the symptom indicates that the primary power supply circuit does
not operate properly. Check the power primary circuit and parts as follow;
AC cord, F601 (Fuse), Power board,
SW90 (Thermal sw.) short in normal
SW90 opens when the surrounding temperature of the switch exceeds 105°C.
This projector provides a function which can be specified a defective area simply by indicating the LEDs. Connect the
AC cord and press the Power button once and then check the LED indication.
- When the WARNING (red) and PoWER(red) indicators are flashing , the symptom indicates that the projector
detected an abnormal temperature risen inside the projector. Check the air filters and remove the object near the
intake and exhaust fan openings, and wait until the POWER indicator stops flashing, and then try to turn on the
projector.
The internal temperature is monitored by sensor ICs, IC8811(Lamp), IC881 (Panel) and IC8831 (Room)
on the Main board
- When the WARNING indicator lights red , the symptom indicates that the projector detected an abnormality in
the 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_LAN (Error:L) is sent to pin 16 of IC301 <SCALER> when the abnormality occurs inside the
projector, and then the IC301 sends the shutdown signal, LAMPDC_ON, to the power supply circuit to stop
its operation, and signal BALAST_AC to the lamp ballast board via IC4891 and SW901<lamp cover switch> to
stop operation of the lamp circuit.
An abnormality occurs on the LAN Power Supply.
Check power supply of LAN circle, Power_On_LAN signal (Power_On:H) is output from pin 183 of IC301
and switches Q575 3.3V_LAN power supply cicuit.
The P_FAIL signal (Error: L) is sent to pin 15 of IC301<SCALER> when the abnormality occurs inside the
projector, and then the IC301 sends the shutdown signal, LAMPDC_ON, to the power supply circuit to stop its
operation, and signal BALAST_AC to the lamp ballast board via IC4891 and SW901<lamp cover switch> to stop
operation of the lamp circuit.
An abnormality occurs on the secondary power supply;
Check power supplies S15.5V, 15.5V, S6V, S-5V. P_FAIL signal becomes “Low” when the abnormality oc-
curs on any of the power supply lines.
An abnormality occurs on the fan control circuit;
Check FN901, FN90, FN903, FN904, FN905, FN906 and peripheral circuit.
If any of the fans has an error, the fan lock signal drives Q3601 becomes on. As the result, signal FAN_ERR
becomes Low and is sent to lamp ballast board to stop lamp circuit.
An abnormality occurs on the drive signals;
ON_15V signal (Power-on: H) is output from pin 01 of IC301 and switches Q509,15.5V supply circuit.
ON_5V signal (Power-on: H) is output from pin 99 of IC301 and switches IC5461, 1V supply circuit and
switches IC5081, 5V_AUDIO supply circuit. ON_3.3V signal (Power-on: H) is output from pin 11 of IC301
and switches Q358, 3.3VGAM supply circuit and IC561, 1.0V supply circuit.
LAMPDC_ON signal (Power-on: H) is output from pin 89 of IC301 and supplied to the P.F Control IC,
IC61, on the power supply board through Q651, and PC643.
BALAST_AC signal (Power-on: H) is output from pin 84 of IC301 and applied to pin of IC4891 and out-
put pin 4 and then supplied to the lamp ballast board through SW901<Lamp Cover SW>.
CHO_RXD signal at pin 6 of IC301 is applied from the lamp ballast unit. If the abnormality occurred on
the lamp ballast unit, LAMP_DET/CHO_RXD signal becomes “High” and then IC301 shuts down the power
supply circuit.
Lamp Cover switch
Make sure that the lamp cover is mounted correctly. If not or the
lamp cover removed, the lamp does not light on for the safety. Check
the lamp cover and lamp cover switch (SW901).
SW901