Sharp R-671M Service Manual ▷ View online
R-671M - 17
OUTLINE OF TOUCH CONTROL PANEL
TOUCH CONTROL PANEL ASSEMBLY
3) 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.
order to compose a basic standard time in the clock
circuit. It accompanies a very small error because it
works on commercial frequency.
4) ACL
A circuit to generate a signals which resets the LSI to
the initial state when power is supplied.
the initial state when power is supplied.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion
sound).
audible sounds (key touch sound and completion
sound).
6) Door Sensing Switch (Stop Switch)
A switch to "tell" the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, top heating element, bottom
heating element, fan motor, turntable motor and light
the oven lamp.
heating element, fan motor, turntable motor and light
the oven lamp.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD1 - LD4).
LD1 - LD4).
9) Indicator Circuit
This circuit consists of 4-digits, 12-segments and 3-
common electrodes using a Liquid Crystal Display.
common electrodes using a Liquid Crystal Display.
10) Cooking Mode Indicator Circuit
A circuit to drive the Cooking Mode indicator (the light
emiting diodes LD6-LD9).
emiting diodes LD6-LD9).
The touch control section consists of the following units as
shown in the touch control panel circuit.
shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit
(2) Control Unit
The principal functions of these units and signals commu-
nicated among them are explained below.
nicated 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 P23 - P27.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P74 - P77
to perform the function that was requested.
the LSI are sent to the key unit through P23 - P27.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P74 - P77
to perform the function that was requested.
Control Unit
Control unit consists of LSI, power source circuit, synchro-
nizing signal circuit, ACL circuit, buzzer circuit, relay
circuit, indicator circuit and back light circuit.
nizing signal circuit, ACL circuit, buzzer circuit, relay
circuit, indicator circuit and back light circuit.
1) LSI
This LSI controls the key strobe signal, relay driving
signal for oven function and indicator signal.
signal for oven function and indicator signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control
unit.
unit.
Symbol
Voltage
Application
VC
-5V
LSI(IC1)
R-671M - 18
20 msec
During cooking
H
L
ON
OFF
During
cooking
L
GND
H.
(Grill or dual)
ON
OFF
During
cooking
L
GND
H.
(Grill or dual)
ON/OFF time ratio in Mi-
cro cooking
(a. 32second time base)
cro cooking
(a. 32second time base)
ON/OFF time ratio in Mi-
cro cooking
(a. 48second time base)
cro cooking
(a. 48second time base)
MICRO
ON
OFF
COOK
100%
100%
32sec.
0sec.
70%
24sec.
8sec.
50%
18sec.
14sec.
30%
12sec.
20sec.
10%
6sec.
26sec.
MICRO
ON
OFF
COOK
100%
100%
48sec.
0sec.
70%
36sec.
12sec.
50%
26sec.
22sec.
30%
16sec.
32sec.
10%
8sec.
40sec.
LSI(IZA921DR)
The I/O signal of the LSI(IZA921DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
1-2
VL2-VL1
IN
Power source voltage input terminal.
Standard voltage for LCD.
3-5
AN7-AN5
OUT
Terminal to change functions according to the Model
DC voltage in accordance with the model in operation is applied to set up its function
6
AN4
OUT
Terminal not used.
7
AN3
IN
Terminal not used.
8
AN2
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal.
Door opened; "L" level signal.
Door opened; "L" level signal.
9-10
P01-P00
OUT
Terminal not used.
11
P57
IN
Terminal not used.
12
P56
OUT
Oven lamp and turntable motor driving signal (Square Waveform : 50Hz)
To turn on and off shut-off relay(RY1). The
square waveform voltage is delivered to
the relay(RY1) driving circuit.
square waveform voltage is delivered to
the relay(RY1) driving circuit.
13
P55
OUT
Terminal not used.
14
P54
OUT
Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
B: Completion sound.
15
P53
OUT
Touch control transformer driving signal.
To turn on and off the shut off relay (RY6). If the oven has not been used for more
than two minutes, the relay (RY6) will be turned off. The relay (RY6) will be turned
on when the oven door is opened and closed.
than two minutes, the relay (RY6) will be turned off. The relay (RY6) will be turned
on when the oven door is opened and closed.
16
P52
OUT
Fan motor driving signal.
To turn on and off the fan motor relay
(RY5). "L" level during cooking, or for 5
minutes after GRILL cooking or DUAL
cooking. "H" level otherwise.
(RY5). "L" level during cooking, or for 5
minutes after GRILL cooking or DUAL
cooking. "H" level otherwise.
17
P51
OUT
Grill heating element (TOP GRILL)driving signal.
To turn on and off the grill heating element
relay (RY3). "L" level during grill (TOP
GRILL, TOP AND BOTTOM) cooking or
dual (MICRO + TOP) cooking; "H" level
otherwise.
relay (RY3). "L" level during grill (TOP
GRILL, TOP AND BOTTOM) cooking or
dual (MICRO + TOP) cooking; "H" level
otherwise.
18
P50
OUT
Bottom heating element driving signal.
To turn on and off the bottom element relay
(RY4). "L" level during grill (BOTTOM
HEATER, TOP AND BOTTOM) cooking or
dual (MICRO + BOTTOM) cooking; "H"
level otherwise.
(RY4). "L" level during grill (BOTTOM
HEATER, TOP AND BOTTOM) cooking or
dual (MICRO + BOTTOM) cooking; "H"
level otherwise.
19
P47
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook
relay (RY2). In 100% POWER
operation, the signals hold "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 according to the
power level.
relay (RY2). In 100% POWER
operation, the signals hold "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 according to the
power level.
DESCRIPTION OF LSI
ON
OFF
During cooking, or for 5 minutes
after grill cooking, or dual cooking
after grill cooking, or dual cooking
L
GND
H.
A
B
H: GND
L
H: GND
L
0.12 sec
2.4 sec
R-671M - 19
20-22
P46-P44
OUT
Terminal not used.
23
INT 1
IN
Terminal not used
24
INT0
IN
Signal to synchronized LSI with commercial power source
frequency(50Hz).
frequency(50Hz).
This is basic timing for time processing of LSI.
25
P41
IN
Terminal not used
26
P40
IN
Connected to VC.
27
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.
set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter
set at "H" level.
28-29
P71-P70
OUT
Connected to both terminals R71 and R70
30
XIN
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XIN terminal.
with respect to XIN terminal.
31
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
32
VSS
IN
Power source voltage: -5V
VC voltage of power source circuit input.
33
P27
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P17 - P14 terminal
while one of G5 line keys on matrix is touched.
while one of G5 line keys on matrix is touched.
34
P26
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P17 - P14 terminal
while one of G6 line keys on matrix is touched.
while one of G6 line keys on matrix is touched.
35
P25
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P17 - P14 terminal
while one of G7 line keys on matrix is touched.
while one of G7 line keys on matrix is touched.
36
P24
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P17 - P14 terminal
while one of G8 line keys on matrix is touched.
while one of G8 line keys on matrix is touched.
37
P23
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P17 - P14 terminal
while one of G9 line keys on matrix is touched.
while one of G9 line keys on matrix is touched.
38
P22
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P17 - P14 terminal
while one of G10 line keys on matrix is touched.
while one of G10 line keys on matrix is touched.
39
P21
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P17 - P14 terminal
while one of G11 line keys on matrix is touched.
while one of G11 line keys on matrix is touched.
40
P20
OUT
Terminal not used.
41
P17
IN
Signal coming from touch key.
When any one of G4 line keys on key matrix is touched, a corresponding signal
from P27 - P20 will be input into P17. When no key is touched, the signal is held
at "L" level.
from P27 - P20 will be input into P17. When no key is touched, the signal is held
at "L" level.
42
P16
IN
Signal similar to P17.
When any one of G3 line keys on key matrix is touched, a corresponding signal will
be input into P16.
be input into P16.
43
P15
IN
Signal similar to P17.
When any one of G2 line keys on key matrix is touched, a corresponding signal will
be input into P15.
be input into P15.
Pin No.
Signal
I/O
Description
20 msec
H : GND
L (-5V)
DESCRIPTION OF LSI
CONT
...
R-671M - 20
44
P14
IN
Signal similar to P17.
When any one of G1 line keys on key matrix is touched, a corresponding signal will
be input into P14.
be input into P14.
45-48
P13-P10
IN
Terminal not used.
49
P07
OUT
Cooking mode indicator driving signal
To turn on and off the light emitting diode LD8.
50
P06
OUT
Cooking mode indicator driving signal
To turn on and off the light emitting diode LD9.
51
P05
OUT
Cooking mode indicator driving signal
To turn on and off the light emitting diode LD7.
52
P04
OUT
Cooking mode indicator driving signal
To turn on and off the light emitting diode LD6.
53-56
P00-P03
OUT
Terminal not used.
57-60
P37-P34
OUT
Terminal not used.
61-72
SEG11-
OUT
Segment data signal.
SEG0
Connected to LCD.
The relation between signals are as follows:
The relation between signals are as follows:
LSI signal (Pin No.)
LCD (Pin No.)
LSI signal (Pin No.) LCD (Pin No.)
SEG 0 (1) .......................... S12(4)
SEG 6 (7) ....................... S6(10)
SEG 1 (2) .......................... S11(5)
SEG 7 (8) ....................... S5(11)
SEG 2 (3) .......................... S10(6)
SEG 8 (9) ....................... S4(12)
SEG 3 (4) ............................ S9(7)
SEG 9 (10) ..................... S3(13)
SEG 4 (5) ............................ S8(8)
SEG 10 (11) ................... S2(14)
SEG 5 (6) ............................ S7(9)
SEG 11 (12) ................... S1(15)
73
VCC
IN
Connected to GND.
74
VREF
IN
Connected to GND.
75
AVSS
IN
Connected to VC.
76
COM3
OUT
Terminal not used.
77
COM2
OUT
Common data signal: COM3.
Connected to LCD (Pin No. 3).
78
COM1
OUT
Common data signal: COM2.
Connected to LCD (Pin No. 2).
79
COM0
OUT
Common data signal: COM1.
Connected to LCD (Pin No. 1).
80
VL3
IN
Power source voltage input terminal.
Standard voltage for LCD.
Pin No.
Signal
I/O
Description
DESCRIPTION OF LSI
CONT
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