2-21
EMP-TW1000
SEIKO EPSON Revision:A
Operation Control
The MA board is connected to two thermistors monitoring the internal temperature. The
thermal monitor CPU (IC1103) controls the operation of the three fans* (LV fan, Exhaust fan
and Power Supply fan), based on the temperatures detected by the thermistors. (*: Lamp fan
runs at a constant speed.)
The signals output by IC550, the main CPU on the MA board, are used to change the output
from the fan drive regulator circuit on the MA board in order to control three intake fans and
the Exhaust fan. The feedback signals from the fans are used by the thermal monitor CPU to
monitor the fan operation (stopped or running) for any abnormalities. If the themal monitor
CPU detects abnormality from the feedback signals, the main CPU executes a process
predetermined depending on the error status.
Fan Operation
Standby Mode
LV Fan : The rotating speed is controlled according to temperature detected
by the LV themistor.
Power Fan: The rotation speed is controlled in conjunction with the LV fan.
Lamp Fan : Operates at a constant speed from power-on.
Exhaust Fan: The rotating speed is controlled according to the thermal data detected
by the Lamp themistor.
When the Lamp is ON
The intake fans and Exhaust fan start to operate at low speed (the initial speed) 0.5 seconds
before turning the lamp on. After the lamp turns on, each fan operates at a designated speed
based on the temperature detected by the corresponding thermistor.
During Cool-down
When the lamp is turned off, the fans operate for a few seconds to cool the projector.
To Next Page
Loading...
Need help?
General
