Sharp R-962M Service Manual ▷ View online
R-962M - 13
Pin No.
Signal
I/O
Description
During cooking
L
H
20 msec.
20 msec.
H : GND
L (-5V)
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
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47
terminal while one of G8 line key on matrix is touched.
terminal while one of G8 line key on matrix is touched.
26
P40
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47
terminal while one of G7 line key on matrix is touched.
terminal while one of G7 line key on matrix is touched.
27
P77
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47
terminal while one of G6 line key on matrix is touched.
terminal while one of G6 line key on matrix is touched.
28
P76
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47
terminal while one of G5 line key on matrix is touched.
terminal while one of G5 line key on matrix is touched.
29
P75
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47
terminal while one of G4 line key on matrix is touched.
terminal while one of G4 line key on matrix is touched.
30
P74
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47
terminal while one of G3 line key on matrix is touched.
terminal while one of G3 line key on matrix is touched.
31
P73
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47
terminal while one of G2 line key on matrix is touched.
terminal while one of G2 line key on matrix is touched.
32
P72
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47
terminal while one of G1 line key on matrix is touched.
terminal while one of G1 line key on matrix is touched.
33
P71
OUT
Oven lamp and turntable motor driving signal(Square Waveform : 50Hz).
To turn on and off shut-off relay
(RY6). The square waveform
voltage is delivered to the relay
(RY6) driving circuit.
(RY6). The square waveform
voltage is delivered to the relay
(RY6) driving circuit.
34
P70
IN
Connected to VC.
35
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.
Temporarily set to "L" level the moment power is applied, at this time the LSI
is reset. Thereafter set at "H" level.
36
P81
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook
relay (RY2). In 100%
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%
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
LSI(IZA963DR)
The I/O signal of the LSI(IZA963DR) are detailed in the following table.
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
cooking
(a. 32second time base)
ON/OFF time ratio in Micro
cooking
(a. 48second time base)
cooking
(a. 48second time base)
MICRO
ON
OFF
COOK
100%
32 sec.
0 sec.
70%
24 sec.
8 sec.
50%
18 sec. 14 sec.
30%
12 sec. 20 sec.
10%
6 sec. 26 sec.
MICRO
ON
OFF
COOK
100%
48 sec.
0 sec.
70%
36 sec. 12 sec.
50%
26 sec. 22 sec.
30%
16 sec. 32 sec.
10%
8 sec. 40 sec.
R-962M - 14
Pin No.
Signal
I/O
Description
Power output
ON time
OFF time
100 %
48 sec.
0 sec.
90 %
44 sec.
4 sec.
80 %
40 sec.
8 sec.
70 %
36 sec.
12 sec.
60 %
32 sec.
16 sec.
50 %
26 sec.
22 sec.
40 %
22 sec.
26 sec.
30 %
16 sec.
32 sec.
20 %
12 sec.
36 sec.
10 %
8 sec.
40 sec.
Power output
ON time
OFF time
100 %
48 sec.
0 sec.
90 %
44 sec.
4 sec.
80 %
40 sec.
8 sec.
70 %
36 sec.
12 sec.
60 %
32 sec.
16 sec.
50 %
26 sec.
22 sec.
40 %
22 sec.
26 sec.
30 %
16 sec.
32 sec.
20 %
12 sec.
36 sec.
10 %
8 sec.
40 sec.
ON
OFF
During
cooking
L
GND
H.
(Convection or dual cooking)
ON
OFF
During cooking or for 5 minutes after
grill, or for awhile after convection or dual.
grill, or for awhile after convection or dual.
L
GND
H.
ON
OFF
L
GND
H.
37
P80
OUT
Grill heaters (TOP HEATER) driving signal.
To turn on and off the grill
heaters relay (RY3). "L" level
during grill cooking, convection
cooking or dual cooking, "H"
level otherwise. The heater relay
turns on and off within a 48
second time base in accordance
with the special program in LSI.
heaters relay (RY3). "L" level
during grill cooking, convection
cooking or dual cooking, "H"
level otherwise. The heater relay
turns on and off within a 48
second time base in accordance
with the special program in LSI.
38
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.
circuit with respect to XIN terminal.
39
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
40
VSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
41
P27
OUT
Convection heater driving signal.
To turn on and off the relay (RY4).
"L" level during convection cooking
or dual cooking, "H" level
otherwise.
The heater relay turns on and off
within a 48 second time base in
accordance with the special
program in LSI.
"L" level during convection cooking
or dual cooking, "H" level
otherwise.
The heater relay turns on and off
within a 48 second time base in
accordance with the special
program in LSI.
42
P26
OUT
Convection motor driving signal.
To turn on and off shut-off
relay(RY7). "L" level during
convection or dual cooking "H" level
otherwise. (Relay RY7 does not turn
on at preheating mode.)
relay(RY7). "L" level during
convection or dual cooking "H" level
otherwise. (Relay RY7 does not turn
on at preheating mode.)
43
P25
OUT
Fan motor driving signal.
To turn on and off the fan motor relay
RY6. "L" level during cooking, or for 5
minutes after grill cooking or Mix
cooking for a while after convection.
"H" level otherwise.
RY6. "L" level during cooking, or for 5
minutes after grill cooking or Mix
cooking for a while after convection.
"H" level otherwise.
44
P24
OUT
Terminal not used.
45
P23
OUT
Touch control transformer driving signal.
To turn on and off the shut off relay (RY5). If the oven has not been used for
more than 2 minutes, the relay RY5 will be turned off. The relay RY5 will be
turned on when the oven door is opened and closed.
more than 2 minutes, the relay RY5 will be turned off. The relay RY5 will be
turned on when the oven door is opened and closed.
46
P22
OUT
Damper motor relay driving signal.
To turn on and off the shut off relay (RY8).
47
P21
OUT
Terminal not used.
48
P20
IN
Input signal which communicates the damper open/close information to
LSI.
LSI.
Damper opened; "H" level signal (0V:GND).
Damper closed; "L" level signal (-5V:VC).
Damper closed; "L" level signal (-5V:VC).
DESCRIPTION OF LSI
LSI(IZA963DR)
The I/O signal of the LSI(IZA963DR) are detailed in the following table.
R-962M - 15
Pin No.
Signal
I/O
Description
49-50
P17-P16
OUT
Terminal to change functions according to the model.
51-80
SEG39-SEG10
OUT
Segment data signal.
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 (90) .................... SEG39 (51)
SEG21 (69) ................. SEG19 (19)
SEG 1 (89) .................... SEG38 (50)
SEG22 (68) ................. SEG18 (18)
SEG 2 (88) .................... SEG37 (49)
SEG23 (67) ................. SEG17 (17)
SEG 3 (87) .................... SEG36 (48)
SEG24 (66) ................. SEG16 (16)
SEG 4 (86) .................... SEG35 (47)
SEG25 (65) ................. SEG15 (15)
SEG 5 (85) .................... SEG34 (46)
SEG26 (64) ................. SEG14 (14)
SEG 6 (84) .................... SEG33 (45)
SEG27 (63) ................. SEG13 (13)
SEG 7 (83) .................... SEG32 (44)
SEG28 (62) ................. SEG12 (12)
SEG 8 (82) .................... SEG31 (43)
SEG29 (61) ................. SEG11 (11)
SEG10 (80) ...................SEG30 (30)
SEG30 (60) ................. SEG10 (10)
SEG11 (79) ...................SEG29 (29)
SEG31 (59) ................... SEG 9 ( 9)
SEG12 (78) ...................SEG28 (28)
SEG32 (58) ................... SEG 8 ( 8)
SEG13 (77) ...................SEG27 (27)
SEG33 (57) ................... SEG 7 ( 7)
SEG14 (76) ...................SEG26 (26)
SEG34 (56) ................... SEG 6 ( 6)
SEG15 (75) ...................SEG25 (25)
SEG35 (55) ................... SEG 5 ( 5)
SEG16 (74) ...................SEG24 (24)
SEG36 (54) ................... SEG 4 ( 4)
SEG17 (73) ...................SEG23 (23)
SEG37 (53) ................... SEG 3 ( 3)
SEG18 (72) ...................SEG22 (22)
SEG38 (52) ................... SEG 2 ( 2)
SEG19 (71) ...................SEG21 (21)
SEG39 (51) ................... SEG 1 ( 1)
SEG20 (70) ...................SEG20 (20)
81
SEG9
OUT
Terminal not used.
82-90
SEG8-SEG0
OUT
Segment data signal.
Connected to LCD. Signal is similar to SEG39.
91
VCC
IN
Connected to GND.
92
VREF
IN
Connected to GND.
93
AVSS
IN
Connected to VC.
94
COM3
OUT
Terminal not used.
95
COM2
OUT
Common data signal: COM3.
Connected to LCD (Pin No. 35).
96
COM1
OUT
Common data signal: COM2.
Connected to LCD (Pin No. 34).
97
COM0
OUT
Common data signal: COM1.
Connected to LCD (Pin No. 33).
98-99
VL3-VL2
IN
Power source voltage input terminal.
Standard voltage for LCD.
100
C2
IN
Terminal not used.
DESCRIPTION OF LSI
LSI(IZA963DR)
The I/O signal of the LSI(IZA963DR) are detailed in the following table.
R-962M - 16
ABSOLUTE HUMIDITY SENSOR CIRCUIT
Changing the resistance values results in that there is
the same potential at both F-3 terminal of the absolute
humidity sensor and AN0 terminal of the LSI. The
voltage of AN1 terminal will indicate about -2.5V. This
initial balancing is set up about 16 seconds after the unit
is put in the Sensor Cooking mode. As the sensor
cooking proceeds, the food is heated to generate
moisture by which the resistance balance the bridge
circuit is deviated to increase the voltage available at
AN1 terminal of the LSI.
Then the LSI observes that voltage at AN1 terminal and
compares it with its initial value, and when the comparison
rate reaches the preset value (fixed for each menu to be
cooked), the LSI causes the unit to stop sensor cooking;
thereafter, the unit goes in the next operation
automatically.
When the LSI starts to detect the initial voltage at AN1
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance, of
the bridge circuit due to disconnection of the absolute
humidity sensor, ERROR will appear on the display and
the cooking is stopped.
the same potential at both F-3 terminal of the absolute
humidity sensor and AN0 terminal of the LSI. The
voltage of AN1 terminal will indicate about -2.5V. This
initial balancing is set up about 16 seconds after the unit
is put in the Sensor Cooking mode. As the sensor
cooking proceeds, the food is heated to generate
moisture by which the resistance balance the bridge
circuit is deviated to increase the voltage available at
AN1 terminal of the LSI.
Then the LSI observes that voltage at AN1 terminal and
compares it with its initial value, and when the comparison
rate reaches the preset value (fixed for each menu to be
cooked), the LSI causes the unit to stop sensor cooking;
thereafter, the unit goes in the next operation
automatically.
When the LSI starts to detect the initial voltage at AN1
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance, of
the bridge circuit due to disconnection of the absolute
humidity sensor, ERROR will appear on the display and
the cooking is stopped.
1) Absolute humidity sensor circuit
Sensing part
(Open vessel)
(Open vessel)
Sensing part
(Closed vessel)
(Closed vessel)
Thermistors
ventilation opening for sensing
SW1
SW2
SW3
SW4
SW5
P54
P53
P52
P51
P50
LSI
(IC1)
(IC1)
AN0
AN1
620k
300k
150k
75k
37.4k
14
9
17
18
10
16
15
47k
47k
IC2
10k
0.01uF
0.015uF
0.01uF
+
VA : -15V
VA : -15V
R90
C101
C102
C103
C104
S
F-2
1.8k
F-1
F-3
C
3.57k
3.32k
VC : -5V
0.1 uF
C. Thermistor in
closed vessel
S. Thermistor in
open vessel
closed vessel
S. Thermistor in
open vessel
R107
R108
R112
R105
360k
R102
R101
R103
R104
D101
R109
R110
R111
R106
C
S
R3
R1
R2
+
Operational
amplifier
amplifier
Output
voltage
voltage
S : Thermistor
open vessel
open vessel
C : Thermistor
closed vessel
closed vessel
2
Absolute humidity (g/m )
Output voltage
Absolute humidity vs,
output voltage characteristic
output voltage characteristic
(1) Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors as
shown in the illustration. One thermistor is housed in the
closed vessel filled with dry air while another in the open
vessel. Each sensor is provided with the protective cover
made of metal mesh to be protected from the external
airflow.
shown in the illustration. One thermistor is housed in the
closed vessel filled with dry air while another in the open
vessel. Each sensor is provided with the protective cover
made of metal mesh to be protected from the external
airflow.
(2) Operational Principle of Absolute Humidity Sensor
The figure below shows the basic structure of an absolute
humidity sensor. A bridge circuit is formed by two
thermistors and two resistors (R1 and R2).
The output of the bridge circuit is to be amplified by the
operational amplifier.
Each thermistor is supplied with a current to keep it heated
at about 150˚C (302˚F), the resultant heat is dissipated in
the air and if the two thermistors are placed in different
humidity conditions they show different degrees of heat
conductivity leading to a potential difference between
them causing an output voltage from the bridge circuit, the
intensity of which is increased as the absolute humidity of
the air increases. Since the output is very minute, it is
amplified by the operational amplifier.
humidity sensor. A bridge circuit is formed by two
thermistors and two resistors (R1 and R2).
The output of the bridge circuit is to be amplified by the
operational amplifier.
Each thermistor is supplied with a current to keep it heated
at about 150˚C (302˚F), the resultant heat is dissipated in
the air and if the two thermistors are placed in different
humidity conditions they show different degrees of heat
conductivity leading to a potential difference between
them causing an output voltage from the bridge circuit, the
intensity of which is increased as the absolute humidity of
the air increases. Since the output is very minute, it is
amplified by the operational amplifier.
(3) Detector Circuit of Absolute Humidity Sensor Circuit
This detector circuit is used to detect the output voltage of
the absolute humidity circuit to allow the LSI to control
sensor cooking of the unit. When the unit is set in the
sensor cooking mode, 16 seconds clearing cycle occurs
than the detector circuit starts to function and the LSI
observes the initial voltage available at its AN1 terminal.
With this voltage given, the switches SW1 to SW5 in the
LSI are turned on in such a way as to change the
resistance values in parallel with R107 ~ R111 of IC2.
the absolute humidity circuit to allow the LSI to control
sensor cooking of the unit. When the unit is set in the
sensor cooking mode, 16 seconds clearing cycle occurs
than the detector circuit starts to function and the LSI
observes the initial voltage available at its AN1 terminal.
With this voltage given, the switches SW1 to SW5 in the
LSI are turned on in such a way as to change the
resistance values in parallel with R107 ~ R111 of IC2.
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