SERVICE MANUAL AIR PURIFIER KC-C100E-W ... - Y. Servis Girişi

KCC100EW
If the state of this input signal remains "H" or "L" longer than a certain time, microprocessor LSI1 determines that a power failure has occurred and
stops the output of the fan motor, plasma cluster unit, rotor motor, dust sensor, odor sensor, buzzer, and LEDs.
2.4. CLOCK CIRCUIT
This circuit generates the clock signal that is required for the operation of microprocessor LSI1.
The oscillation frequency is 8 MHz and is supplied by ceramic oscillator CF1.
2.5. KEY INPUT CIRCUIT
When a key is pressed, a strobe signal corresponding to that key is fed into pin 19 or pin 20 of microprocessor LSI1. The strobe signal is detected and
the pressed key identified.
・Key ON : "H"
・Key OFF : "L"
2.6. LED DRIVE CIRCUIT
・Static drive circuit
ION SIGN LED, QUICK CLEAN LED, DUST MONITOR LED, ODOR MONITOR LED are controlled by static drive.
When "H" is output from pins 21,22 of the microprocessor LSI-1, driverIC IC-110 is turned on and ION SIGN LED, QUICK CLEAN LED is lighted.
Dust monitor LED1 ~ 4 are 2-color LED of green and red, and they will become yellow if green lights up simultaneously with red.
According to the detection value of dust sensor or gas sensor, these LED are lighted as three colors of green, yellow and red.
When "L" is output from pins 30 ~ 33,38,39,44,45 of the microprocessor LSI-1 according to the detection value of dust sensor, transistor Q130 ~
Q137turned on and dust monitor LED 1 ~ 4 light to green, yellow or red.
・Dynamic drive circuit
LED other than LED which are controlled above-mentioned static drive are controlled by dynamic drive.
Repeated "H" and "L" signals are output from pins 34 to 37 of microprocessor LSI1 to make the bases of the corresponding transistors Q110 to Q113
successively go "L" for a set period of time and turn on each transistor. When "H" is output from one of pins 23 to 27 of microprocessor LSI1 at this
timing and turn on each port of driver IC IC-110, the LED connected to that pin illuminates.
2.7. EEPROM CIRCUIT
The cumulative fan motor operating time (judgement time for turning on FILTER LED) and other data is written to or read from the EEPROM (IC90)by
means of a repeated "H"/"L" signal from/to pins 17 and 18 of microprocessor LSI1.
EEPROM(IC90) has memorized a part of deta peculiar to a model. (fan motor number of rotations, sensor detection level etc.)
2.8. BUZZER CIRCUIT
DriverIC IC-150 is driven by an "H"/"L" signal from pin 63 of microprocessor LSI1 to sound buzzer BZ1. The sounding frequency of the buzzer is
approximately 4 kHz.
2.9. ODOR SENSOR CIRCUIT (Not deployment in KC-C70E)
A pulse signal is output from pin 58 of microprocessor LSI1 as the odor sensor drive signal, and this pulse-drives the odor sensor by means of the circuit
consisting of R77,Q71, Q72, R73, R74, R76 and C73.
The sensor output signal passes through R71 and C71 and is fed into pin 50 (the A/D conversion terminal) of microprocessor LSI1.
2.9.1 PRINCIPLE OF THE ODOR SENSOR
When an odor component such as ammonia, hydrogen or alchol comes in contact with the surface of the sensor element, which is a Metallic Oxide
semiconductor, the resistsnce changes, and this is used to detect odors such as cigarette smoke and other common odors.
・Weak odor : high resistance → high output voltage
・Strong odor : low resistance → low output voltage
2.9.2 CONTROL
The detection value 5 seconds after the unit is powered on is taken as the reference value, and after that the value is detected at 1-second intervals
and compared to the reference value to identify the dirtiness of the air, gas monitor display and fan motor control are performed based on the dirtiness
of the air.
However, from the last operation stop, when a new start is carried out within 1 minute, the reference value of the last operation is inherited.
While the unit is running and for 1 minute after an operation the odor sensor continuously operates, however, when the unit stops the circuit is
stopped to reduce standby power consumption.
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