Sharp Carousel R-995J Service Manual - Page 26

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Sharp Carousel R-995J Service Manual
R-995J
Pin No.
Signal
17
P51
OUT
18
P50
OUT
19
P47
OUT
20
P46
OUT
21
P45
OUT
22
P44
OUT
23
P43
OUT
24
P42
OUT
25
INT1
26
P40
27
RST
28
XCIN
29
XCOUT
OUT
30
XIN
31
XOUT
OUT
32
VSS
33
P27
I/O
Magnetron high-voltage circuit driving signal.
To turn on and off the cook
relay(RY2). In HIGH operation, the
signals holds "L" level during micro-
wave 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.
Damper motor relay driving signal.
To turn on and off shut-off relay(RY4).
Heating element driving signal.
To turn on and off shut-off relay(RY3). "L" level
during convection cooking; "H" level otherwise.
During convection cooking, the signal becomes
"H" level when the temperature of the oven cavity
exceeds the predetermined temperature.
Clock signal to IC3.
Data signal output from IC3 and input to IC3.
Timing signal output terminal for temperature measurement(OVEN THER-
MISTOR).
"H" level (GND) : Ttermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing.(Convection cooking)
Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
C: When the temperature of the oven
cavity reaches the preset tempera-
ture in the preheating mode, or when
the preheating hold time (30 min-
utes) is elapsed.
Timing signal output terminal for temperature measurement(OVEN).
"H" level (GND) : Ttermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing.(Convection cooking)
IN
Signal to synchronize LSI with commercial power source freqency.
This is the basic timing for all real time
processing of LSI.
IN
Connected to GND.
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily
set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter
set at "H" level.
IN
Weight sensor data input.
Terminal not used.
IN
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XOUT terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
IN
Signal coming from touch key.
When any one of G-1 line keys on key matrix is touched, a corresponding signal
from P10 - P17 will be input into P27. When no key is touched, the signal is held
at "L" level.
Description
VARI MODE
HIGH (100% power)
MED HIGH (approx. 70% power)
MED (approx. 50% power)
MED LOW (approx. 30% power)
LOW (approx. 10% power)
A
B
1.2 sec
C
24
ON TIME
OFF TIME
32 sec.
0 sec.
24 sec.
8 sec.
18 sec.
14 sec.
12 sec.
20 sec.
6 sec.
26 sec.
H : GND
OFF
ON
L
H.
During
OFF
cooking
(Convection)
ON
L
0.12 sec
2.4 sec
1.2 sec
H: GND
L
H : GND
L (-5V)
20 msec.
GND