2-41
EMP-9000/8000
SEIKO EPSON Revision:A
(1). Control block diagram of fan
Figure2-44 Fan control block
1:
(2). Out Line of function
• Each fan has three lead wires, one of these used for status feed back that fan is running or
not.
• CPU on the Main board Assy unit always observe the fan operations by monitoring feed
back signals. If the feed back signal condition is different from expected, CPU judge as
fan abnormal condition then turns on temperature indicator in red and turn off lamp with
ballast power off.
• Fan drive bias for intake fan and exhaust fan are regulated at the driver circuit (consist
from regulator and transistor circuit) according to the fan control signal from CPU on the
Main board Assy unit. (Intake fan1/2 has three state :stop /slow /fast, Exhaust fan has five
state :stop /slow /midium-slow /midium-fast /fast)
• Power supply fans is provided drive bias which produced on the power supply unit.
Intake Fan
FCTL01 1: Slow 0: Fast
FCTL00 1: Run 0: Stop
FRS1 (Intake fan2) 1: Run 0: Stop
FRS0 (Intake fan1) 1: Run 0: Stop
Exhaust Fan
FCTL22,21 11: Slow (8.0V)
10: Midium-Slow (9.5V)
01: Midium-Fast (11.0V)
00: Fast (12.6V)
FCTL20 1: Run 0: Stop
FRS2 1: Run 0: Stop
Connector board U
Connector board L
Regurator
(12V_F)
FRS2
2.5A
13V
Controller
IC1108
CPU
IC1101
Regurator
IC1400
Main board Assy unit
CN
1400
CN
1401
CN
1002
Regurator
IC1401
Intake Fan2
(Upper)
Intake Fan1
(Lower)
FRS1
FRS0
FCTL21
FCTL20
FCTL01
FCTL00
Exhaust Fan
Power Supply unit
CN1001
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