Epson EMP-S3 Service Manual Page 46

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2-20
EMP-S3
SEIKO EPSON Revision:B
Operation Control
The MA board is connected to the Lamp Thermistor. The driver CPU controls the operation of
the four fans, Intake fan 1, Intake fan 2, Exhaust fan and Power Supply fan, based on the tem-
peratures detected by the thermistor.
The signals output by IC1100, the driver 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 Intake and Exhaust
fans. The feedback signals from the fans are used by the CPU to monitor the fan operation
(stopped or running) for any abnormalities. If the feedback signal indicates a condition that the
CPU does not expect, the CPU determines that there is an abnormality in the operation of the
fan and immediately turns off the lamp and causes the warning indicator to light red.
Fan Operation
Standby Mode
Intake Fan (LV/G FAN): Operates at a constant speed from power-on.
Intake Fan (LV/R FAN): The rotating speed is adjusted according to preset
temperatures detected by the thermistor.
Exhaust Fan: Turns on the power supply fan and starts to operate at low
speed when the thermistor detects temperatures higher than
a given level, and stops when the temperature becomes
lower than the level.
When the Lamp is ON
The intake and exhaust fans start to operate at low speed 0.5 seconds before turning the lamp
on. After the lamp turns on, the fan operates at high speed or low speed based on the temper-
atures detected by the thermistor.
During Cool-down
When the lamp is turned off, the fans operate for a few seconds to cool the projector.
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