Touch Control Panel - Sharp R-408DW Service Manual

R-408DW
R - 4 1 0 D K
R-410DW
The touch control section consists of the following units.
(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit and
LSI Unit).
The principal functions of these units and the signals com-
municated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P20, P21, P22, P23,
P24, P25, P26 and P27.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P41, P43,
P44, P45 and AN0 to perform the function that was re-
quested.
Control Unit
Control unit consists of LSI, ACL circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchro-
nizing signal circuit and back light circuit.
1) ACL
This circuit generates a signal which resets the LSI to the
initial state when power is supplied.
2) Indicator Circuit
This circuit consists of 22 segments and 3 common
electrodes using a Liquid Crystal Display.
LSI(IZB004DR)
The I/O signal of the LSI(IZB004DR) is detailed in the following table.
Pin No. Signal
1-2 VL2-VL1
3-6 AN7-AN4
7 P63
8 AN2
9 AN1
10 AN0
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
I/O
IN Power source voltage input terminal.
Standard voltage for LCD.
IN Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
OUT Terminal not used.
IN Input terminal to judge the model.
Connected to GND through the pull-down resistor R78.
IN To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
IN Input terminal to judge the model.
The one of signals P20 - P27 will be input into AN0 through one of G1 - G8 lines on key
matrix. The LSI will judge the model by this signal.
3) Power Source Circuit
This circuit generates voltages necessary in the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
Symbol Voltage
VC -5V
4) Relay Circuit
A circuit to drive the magnetron, fan motor, turntable
motor and light the oven lamp.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
6) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit.
It accompanies a very small error because it works on
commercial frequency.
7) Door Sensing Switch
A switch to "tell" the LSI if the door is open or closed.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes LD1-
LD4).
Description
18
Application
LSI(IC1)