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KX-P7305 / KX-P7310
5.4.11.5. Toner Empty Sensor Circuit
Toner empty sensor detects the shortage of toner. IC006 ( CPU ) sends the nTECTL ( pin7, IC006 ) signal to Q008. When the nTECTL is low level, transistors Q008 and Q004 are turned on. and LED D517 emits light. If the toner is shorted ( empty ), the light from LED D517 passes through the lens of the Toner Cartridge. When the photo transistor PI451 receives the light, the PI451 is turned on, and the TESEN ( pin4, IC004 ) signal becomes low.
5.4.12. Fan Control Circuit
FANCTL: 1. Full Power Mode When FANCTL signal ( pin 6, IC006 ) is high, pin 14 of IC003 goes high, transistors Q019 and Q022 are turned on. This supplies +24V Power to Fan motor and rotates the Fan. 2. Reducing Power Mode ( Quiet Mode ) Pulse signal ( see below ) is output from pin 6 of IC006.
This pulse signal is integrated by R114 and C097. Voltage of ( A ) is stabilized at approx. 2V. When the voltage of ( B ) is lower than the voltage of ( A ), pin 14 of IC003 goes high, Q019 and Q022 are turned on, then the voltage of ( B ) increases. When the voltage of ( B ) is higher than ( A ), pin 14 of IC003 goes low, Q019 and Q022 are turned off, then voltage of ( B ) decreases. Thus the voltage of ( B ) is controlled almost same as the voltage of ( A ) ( = approx. 2V ). Since the resistor network of R129 and R130 divide the voltage of ( C ) into 1/8, the voltage of ( C ) is controlled approx. 16V ( = 2V x 8 ).
FAN Control Mode Mode Warm Up Printing Others FAN Power Full Full Reduced
FANERR: This signal is used for detecting whether the rotation of fan motor is proper or not. When the fan motor is not rotating properly, this signal is two pulses per revolution with 50% duty cycle. At locked rotor, this signal is held at high (or low) 75
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