Sharp R-950A Service Manual

R-950A
20
DESCRIPTION OF LSI
LSI(IZA850DR):
The I/O signals of the LSI(IZA850DR) are detailed in the following table.
Pin No. Signal I/O Description
P03
ß(50Hz)
H
L
GND
VP
P02
P01
P00
P37
P36
P35
P55
During cooking
L
H
20 msec.
ON
OFF
During
cooking
L
GND
H.
(Convection)
ON
OFF
During
cooking
L
GND
H.
1 VCC IN Connected to GND.
2 VEE IN Anode (segment) of Fluorescent Display light-up voltage: -30V.
Vp voltage of power source circuit input.
3 AVSS IN Power source voltage: -5V.
VC voltage of power source circuit input.
4 VREF IN Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to
GND.(0V)
5-6 AN7-AN6 IN Terminal not used.
7-9 AN5-AN3 IN Heating constant compensation terminal.
10 AN2 IN Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal(0V).
Door opened; "L" level signal(-5V).
11 AN1 IN Input signal which communicates the damper open/close information to LSI.
Damper opened; "H" level signal(0V:GND).
Damper closed; "L" level signal(-5V).
12 AN0 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.
13 P55 OUT Digit selection signal.
The relationship between digit signal and digit are as follows;
Digit signal Digit
P03 ...........................1st.
P02 ..........................2nd.
P01 .......................... 3rd.
P00 ...........................4th.
P37 ...........................5th.
P36 .......................... 6th.
P35 .......................... 7th.
P55 .......................... 8th.
Normally, one pulse is output in every ß
period, and input to the grid of the
Fluorescent Display.
14 P54 OUT Oven lamp and turntable motor driving signal. (Square Waveform : 50Hz)
To turn on and off the shut-off
relay(RY1). The square waveform volt-
age is delivered to the relay(RY1) driv-
ing circuit.
15 P53 OUT Convection motor driving signal.
To turn on and off shut-off relay(RY5). "L"
level during CONVECTION and during
back up for GRILL; "H" level otherwise.
16 P52 OUT Cooling fan motor driving signal.
To turn on and off shut-off relay(RY6). "L"
level during both microwave and convec-
tion cooking; "H" level otherwise.
17 P51 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay(RY2). 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.

Sharp R-950A Specifications

Power

ac line voltage	220 V
microwave frequency	2450 MHz
ac power required (microwave)	1.6 kW
ac power required (convection)	1.6 kW
ac power required (grill)	1.05 kW
ac power required (simul)	3.15 kW

Oven Specifications

oven capacity	41 litre
output power (microwave)	900 W
output power (convection heater)	1500 W
output power (grill heater)	1000 W

Weight and Dimensions

width	627 mm
height	378 mm
depth	492 mm
cavity width	410 mm
cavity height	245 mm
cavity depth	410 mm
weight	29 kg