Sharp R-8470, Service Manual

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PIN NO. 29
S I G N A L E 2 5
I
OUT
R-8470:
Terminal not used.
R-8570:
Used for initial balancing of the bridge circuit(absolute himidity sensor).
NO. 30
S I G N A L E26
I
I/O OUT
A: Key touch sec.)
B: Completion sound. (2.4 sec.)
C: When the temperature of the oven cavity reaches the preset temperature in the preheating mode, or when the
preheating hold time (15 minutes) is elapsed.
(1.2 sec. ON-l sec. OFF repeat)
PIN NO. 31
SIGNAL IRQ E27
IN
This is the basic timing for time processing of LSI.
PIN NO. 32
S I G N A L V s s
V
C
voltage of power source circuit input.
I
IN
PIN NO. 33
SIGNAL RO
To turn on and off the cook relay.
I
O U T
In HIGH operation, the signals holds “L” level during microwave cooking and “H” level while not cooking. In other
cooking modes (MED. HIGH, MED., MED. LOW, LOW) the signal turns to “H” level and “L” level in repetition
according to the power level.
PIN NO. 34 SIGNAL RI
I
O U T
To turn on and off the control relay.
The pulse is delivered to the control relay driving circuit and cook relay and heater relay control cir-
cuit.
PIN NO. 35 SIGNAL R2
O U T
To turn on and off the heater relay.
“L” level during convection cooking; “H” level otherwise.
During convection cooking or mix cooking, the signal becomes “H” level when the temperature of the oven, cavity
exceeds the predetermined temperature.
PIN NO. 36
SIGNAL R3
I
O U T
To turn on and off the cooling fan motor relay. “L” level during both microwave and convection cooking; “H” level
otherwise.
PIN NO. 37
S I G N A L R 4
O U T
To turn on and off the convection motor. “L” level during CONVECTION or MIX COOK; “H” level otherwise.
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