Toyo TA-05CW, Руководство по обслуживанию

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Foot 28 for +5v
3.2 Function of all the elements for power supply
RV1 10K561 ， C10 0.03µF/630V, main function of the two elements are for powerful electricity & wave filtering circuit ；
Function of Fuse 2.5A/250V is to prevent over-voltage & over-current, to protect PCB from damage caused by shorted
circuit due to certain damaged element ； Function of the transformer with 220V/50HZ input &14V output is to provide PCB
board with liable power supply ； Function of D1 、 D2 、 D3 、 D4 diode rectifier is to transform the alternating current provided
by the transformer into direct current ； C1 、 C2 、 C3 、 C4 、 C5 、 C6 、 C7 are wave-filtering capacitors ； Function of the 7812
three-block voltage regulator is to stabilize the direct current to the extent of 12V for the relay’s use
。
Function of 51 0.5W
R13 resistance is to limit the current
；
Function of 7805 three-block voltage regulator is to transform the current-limited 12V
voltage into 5V for the use of CPU &PCB board
。
3.3 Function of all the elements of the sensors
The function of room temperature sensor is to provide CPU with a standard parameter. CPU converts the
standard parameter into the current temperature
；
Function of C14
、
C15
、
C16
、
C17
、
R19
、
R22
（
precision
）
R30
、
R32 is to form a voltage-dividing, wave-filtering circuit, so as to ensure the precision of the thermistor
；
Function of
RT3
、
C12
、
R18
、
R17
、
C13 is to form the outdoor coil temp. detector circuit no used currently
）
3.4 Function of all the elements of emergency switch
Function of 6x6x6x6 micro-adjusting switch is to start and close the unit. When you press the button, the circuit is
closed, power supply will provide CPU with an impulse, which will enable CPU start to work immediately.
SV301
、
R26
、
C8 compose a trouble-free impulse transmission circuit. If C8 is in short circuit ,the unit can not be shut off
。
3.5 Functions of all the elements of indicator:
R7
、
R9
、
R10
、
R11 compose a current-limited circuit to prevent LBD from damage due to CPU’s high voltage
，
LBD
is used as function indication
；
Receiver HS0038
、
R202
、
C201 compose a circuit to receive signals, amplify signals and
to resist interference.
，
so that signals can be sent completely into CPU for decoding
。
3.6 Function of all the elements of stepping motor:
Function of D5
、
D6
、
R1
、
R2
、
9013
、
R4 is to compose a circuit
，
produces and sends pulse to the chip which will process
it to control the speed of PG motor
，
If Q
1
9013 is damaged, speed of PG motor can not be controlled
；
If Q
2
9013 is
damaged, PG motor can not work
；
If optical coupling is damaged, controllable silicon and PG motor can not work
Function of R14
、
R13
、
C21 is to protect controllable silicon
；
Function of R12 is to protect optical coupling; Function of R8
is to limit current. The motor can not work if 1µF/450V capacitor is damaged
；
If resistance value of R16 is more than
100K
，
the PG motor can be look as a true PG motor. When the value of R16 is only 10k, then the PG motor is bogus ;
Function of R21
、
D7
、
C25 is to compose a auto reset circuit
；
R28 is a resistance used for selecting function of cooling only
or cooling & heating function K1
、
K2
、
K3 compose control structure
：
K1 is 4-way valve
，
K2 is outdoor fan motor
，
K3 is
compressor
。