Read Sharp R-90GCK (serv.man8) Service Manual online
20
R-90GCK
Pin No.
Signal
I/O
Description
7
AN15
IN
Primary input voltage watching terminal.
The LSI is watching the primary input voltage through this terminal.
The LSI is watching the primary input voltage through this terminal.
8-10
AN14-AN12
IN
Input terminal to change the specification according to the model.
11
AN11
IN
Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
12
AN10
IN
Input signal which communicates the door open/close information to LSI.
Door closed; “H” level signal(0V).
Door opened; “L” level signal(-5V).
Door opened; “L” level signal(-5V).
13
AN9
IN
Input signal which communicates the damper open/close information to LSI.
Damper closed; “H” level signal(0V:GND).
Damper opened; “L” level signal(-5V).
Damper opened; “L” level signal(-5V).
14
AN8
IN
Relay operation watching terminal.
The LSI is watching so that the three (3) relays for the top heating element, the side
heating element and the power transformer do not operate at the same time.
The LSI is watching so that the three (3) relays for the top heating element, the side
heating element and the power transformer do not operate at the same time.
15
P83
OUT
Timing signal output terminal for temperature measurement(OVEN THER-
MISTOR).
MISTOR).
“L” level (-5V) : Thermistor OPEN timing.
“H” level (GND): Temperature measuring timing.(Convection cooking,Speed grill
“H” level (GND): Temperature measuring timing.(Convection cooking,Speed grill
cooking, Speed roast cooking, Speed bake cooking or preheat)
16
P82
OUT
Oven lamp and turntable motor driving signal. (Square Waveform : 50Hz)
To turn on and off the shut-off relay(RY1).
The square waveform voltage is delivered
to the relay(RY1) driving circuit.
to the relay(RY1) driving circuit.
17
CNVSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
VC voltage of power source circuit input.
18
RESET
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.
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.
19
P81
OUT
Top heating element driving signal.
To operate the solid-state relay for driving the top heating element.
To operate the solid-state relay for driving the top heating element.
20
P80
OUT
Side heating element driving signal.
To operate the solid-state relay for driving the top heating element.
To operate the solid-state relay for driving the top heating element.
21
VSS
IN
Power source voltage: -5V.
VS voltage of power source circuit input.
VS voltage of power source circuit input.
22
XIN
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.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XOUT terminal.
23
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Output to control oscillation input of XIN.
24
VCC
IN
Power source voltage: 0V.
VC voltage of power source circuit input. Connected to GND.
VC voltage of power source circuit input. Connected to GND.
25
P77
OUT
Signal to sound buzzer.
A: Tact switch touch sound.
B: Completion sound.
C: When the oven stops so that the food
can be checked in Automatic cooking
mode.
mode.
26
P76
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay(RY2). In
P-HI operation, the signals holds “L” level
during microwave cooking and “H” level
while not cooking. In other cooking modes
(70%, 50%, 30%, 10%) the signal turns to
“H” level and “L” level in repetition accord-
ing to the power level.
P-HI operation, the signals holds “L” level
during microwave cooking and “H” level
while not cooking. In other cooking modes
(70%, 50%, 30%, 10%) the signal turns to
“H” level and “L” level in repetition accord-
ing to the power level.
During cooking
L
H
20 msec.
A
B
C
H: GND
L
0.1 sec
2.0 sec
1.0 sec
1.0 sec
VARI MODE
ON TIME OFF TIME ON TIME OFF TIME
approx. 70% power
24 sec.
8 sec.
36sec.
12sec.
approx. 50% power
18 sec.
14 sec.
26sec.
22sec.
approx. 30% power
12 sec.
20 sec.
16sec.
32sec.
approx. 10% power
6 sec.
26 sec.
8sec.
40sec.
Microwave cooking mode
Microwave cooking with
other cooking mode
other cooking mode
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