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Service Guide DOC-IT3000/4000
Chapter 2 Principles of Operation
2.2.08 Fan
The fan is controlled by the FAN ON-P signal from the LSI (MSM75V039). Its operating status is
supervised by FAN SENS-N.
Notes:
1. The fan turns off with a predetermined delay after the heater has turned off.
2. Neither the heater nor the fan is driven when the cover is open (reset).
3. If the fan to run, the heater turns off and an alarm is set, preventing the next printout. If
FAN SENS-N is detected while printing, both the heater and the fan come to a halt after
the
end of printout of the current page.
4. A fan alarm is assumed when the fan is abnormal at power-on, and the heater does not
turn on.
5. The heater is turned off if the next PRINT signal is not detected for several minutes
(selected in the menu).
6. The fan is driven 1 minute after the heater has stopped. The fan speed is reduced if the
next PRINT signal is not received during 1 minute.
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Summary of Contents for DOC-IT3000
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