Epson EMP-8000 Service Manual page 65

Temperature detection result are notified to the operation with temperature indicator..
Table 2-7 Temperature indication
Condition
Normal temperature
Warning temperature
Abnormal temperature
*Result of condition affect to the fan operations. Refer to the paragraph 2.15 for details.
*Refer to the paragraph 2.16 for detail of temperature indicator.
(1). PBS/Lamp thermistor
Two thermistors are combined with connector and treat as one parts. Lamp thermistor is
mounted with screw on the lamp outer housing (closed to safety switch) and detect the tem-
perature of lamp area.
PBS thermistor is placed with screw on the multi lens area of light guide unit and detect the
temperature.
To prevent the damage with over heat of lamp inner housing, turns off ballast power (lamp
power) when the temperature exceed predefined level.
(2). LV thermistor
LV thermistor is mounted with screw on the top of light valves. When the cooling function is
not enough because of dart condition with air filter or prism duct, CPU on the Main board Assy
unit output the warning indication with temperature indicator or tums off ballast power (lamp
power) in order to protect the damage of light valves(LCD panel).
LAMP Thermistor
PBS Thermistor
SEIKO EPSON
EMP-9000/8000
Temperature Meaning
indicator
Off Operating in the normal condition
Blink in orange Projection will stop if the temperature increase more.
Red
Light in red Over heat condition(stop the display)
Blink in red Malfunction with fan, thermistor, temperature detec-
tion circuit and etc..
PBS/
Figure2-40 Lamp/LV thermistor
2-39
LV Thermistor
Revision:A