Sanyo PLV-Z4 Service Manual page 81

Indicators
From previous page
WARNING (red) and
POWER (red) indica-
tors are flashing?
POWER (red) and
LAMP REPLACE
(yellow) indicators are
flashing?
POWER indicator is
flashing orange?
• • • lights green.
• • • flashes orange.
Troubleshooting
Yes
No
Yes
No
Yes
• • • flashes green. • • • lights red.
• • • flashes yellow.
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 the sensors,
IC8841 on Main Board, TH901 and TH902.
(Refer to "Fan control circuit")
The symptom indicates that the projector detected an
abnormality in the lamp driving signal. Check the
lamp driving signal, Lamp Cover SW and the
Thermal SW.
- LAMP_SW signal (Lamp-on:L) from pin 16 of IC4801 is
sent to Lamp Ballast Unit through SW8803(Lamp Cover
SW) and SW902(Thermal SW).
- TXL signal is output from pin 17 of IC4801 and sent to
Lamp ballast Unit via IC4833.
(TXL signal is applied for lamp power control. Lo: Low
power, Hi: High power)
- RXL signal (Lamp status signal) is output from Lamp
Ballast Unit and sent to pin 18 of IC4801 via IC4833,
then LAMP_ERR signal is output from pin 4 of IC4801
and sent to IC301 via pin 7 of IC1801.
If an abnormality occurred on the lamp ballast unit, RXL
signal and LAMP_ERR signal become "H" and then the
projector will be cooled down and to stand-by mode
(POWER indicator lights red).
Lamp Cover Switch (SW8803 on Lamp SW board)
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.
Thermal Switch (SW902) ......short in normal
SW902 opens when the surrounding temperature of the
switch exceeds 90°C.
The symptom indicates that the projector detected an
abnormality in the slide shutter. Check the slide shut-
ter and the door switches.
Door Switches (SW8801/SW8811 on Door SW-A/B
board)
Make sure that the shutter is open or close. If it is half-
open or close, the lamp does not light.
• • • flashes red.
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Troubleshooting
• • • off