Sharp Carousel R-350F Manual de serviço - Página 16

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R-350F
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
communicated 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 P00-P07.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P14-P17,
ANI6 and ANI7 to perform the function that was re-
quested.
Control Unit
Control unit consists of LSI, reset circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchro-
nizing signal circuit and back light circuit.
1) Reset Circuit
This circuit generates a signal which resets the LSI to
the initial state when power is supplied.
2) Indicator Circuit
This circuit consists of 40 segments and 16 common
electrodes using a Liquid Crystal Display. The Liquid
Crystal Display (LCD) is drived by LCD driver IC3.
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No.
Signal
I/O
1
COM5
OUT
2
COM4
OUT
3
COM3
OUT
4
COM2
OUT
5
COM1
OUT
6
COM0
OUT
7-10
VL1-VL4
IN
11
VL5
IN
12-14
C3-C1
IN
15
VLIN
IN
16
VREG
OUT
17
NC
18
VSS
IN
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
Common data signal : COM11.
Connected to LCD signal COM11.
Common data signal : COM12.
Connected to LCD signal COM12.
Common data signal : COM13.
Connected to LCD signal COM13.
Common data signal : COM14.
Connected to LCD signal COM14.
Common data signal : COM15.
Connected to LCD signal COM15.
Common data signal : COM16.
Connected to LCD signal COM16.
Power source voltage input terminal.
Standard voltage for LCD.
Power source voltage input terminal.
Standard voltage for LCD. Connected to GND.
Terminal not used.
Terminal not used.
Terminal not used.
Terminal not used.
Power source voltage : -5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC.
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) 2nd. Interlock Relay Control 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
LD10- LD15).
Description
14
Application
LSI(IC1)