Epson PowerLite 5000 Service Manual page 41

Functional Outline
•
IC600 and related circuits are backed up with +3.3 V which is provided from the power
supply. (If the AC cable is connected to the AC source, power supply provides the
+3.3 V for back-up bias even if RS-361 is turned off.)
•
When the power is turned on, IC600 on the main board generates the reset signal and
initializes the circuit. The CPU reads the program from flash ROM and writes it into
SRAM. Then the CPU sets the functions based on the program and projects the initial
image.
•
Three thermistors (LV Thermistor / Lamp Thermistor / PBS Thermistor) detect
temperature. If the temperature exceeds a predefined level, the thermistors send an
interrupt signal to IC600 and shut off the power supply.
•
Computer analog or digital input signals are converted into analog signals first, then
converted to digital signals again by ADC. These display data written into the video
memory (SRAM).
•
Analog output signals are transmitted in different ways for analog input and digital
input.
1. Digital RGB:
The digital image signals are output via the gate and driver board.
2. Analog RGB
The analog image signals are converted by the ADC and the D/A converter.
•
The data is stored in the SRAM, then output for display to the video controller via the
CPU.
•
Video input signals are transferred via the AU board and converted into digital signals
with the A/D converter. They are stored in the SRAM.
•
The projector has a timer circuit that controls the operating time of the light source bulb
(lamp inner housing). Its operation is described below.
Table 2-5
Light source state
When the operating time of the light source
bulb (lamp inner housing) exceeds 1900
hours.
When operating time of the light source bulb
(lamp inner housing) exceeds 2000 hours.
When the light source bulb (lamp inner
housing) runs out before its expected end of
life.
If you observe the conditions above, replace the light source bulb (lamp inner housing).
Then turn on the switch. The fuse in the lamp will melt and short out, so that the lamp timer
will be reset automatically.
EPSON PowerLite 5000 Service Manual
Lamp monitor state
The lamp monitor continues to flash red and
orange for 5 minutes after it is turned on. (The
light source stays on.)
The lamp monitor flashes green and orange.
(The light source goes off.)
The lamp monitor flashes red.
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