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4) Heater and motor control circuits
Circuit diagram
m
'F
(N
04
010!
~
+13
21
.
I
A
I
(%
Q102
M
Rl(
Ca
-t---
1
C9
1-
VDD
P60
P61
Ic 1
Wss
Description of operation
(1) Heater control circuit
When the voltage at pin 13 of
the micro computer
(ICI)
becomes
Low (OV),
the
signal will drive
transistor (QI 05), transistor (Ql 03), Photo triac (PH101 ), and thentriac(TAC101
) to operate the
heater,
(2) Motor control circuit
When the voltage at pin 14 of the micro computer (IC1 ) becomes Low (OV), the signal will drive
transistor (Q1 04), transistor (Ql 02), Photo traiac (PH1 02), and thentriac(TAC102)
to operate the
motor.
5) Control circuit for inner temperature
Circuit diagram
2'~
VDD
z
1-
17
)
AN1
i?" " - -G Ii
i?: ~
25 P20
Icl
42 Vss
.Description of operation
(1) The circuit controls the inner temperature during the timer setting and starl of operation.
w
6
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