Sharp R-23AM Service Manual ▷ View online
R-23AM
15
6) I-2 (Memory Processor)
This is a memory IC, responsible for memory function.
7) Display Circuit
This is a circuit for driving display tubes by I-1 output.
8) Switch Input Circuit
This is a circuit for transmitting switch input information
to I-1.
to I-1.
9) Sound-body Driving Circuit
This is a circuit for driving sound body by I-1 output.
10) Relay Driving Circuit
This is a circuit for driving output relay by I-1 output.
11) Stop Switch Circuit
This is a circuit for driving I-1 to detect door opening/
closing.
closing.
12) Exhaust Air Temperature Detecting Circuit
This is a circuit for transmitting output change of
thermistor (Exhaust thermistor) to I-1.
thermistor (Exhaust thermistor) to I-1.
13) Magnetron Temperature Circuit.
(Detect Noload or Fan Lock)
This is a circuit for transmitting output change of
thermistor (Magnetron thermistor) to I-1.
This is a circuit for transmitting output change of
thermistor (Magnetron thermistor) to I-1.
2. Switch Unit
The switch unit is composed of a matrix circuit in which
when a switch it touched, one of signals P30 - P31
generated by the LSI, is passed through the switch
and returned to the LSI as one of signals P24 - P26.
when a switch it touched, one of signals P30 - P31
generated by the LSI, is passed through the switch
and returned to the LSI as one of signals P24 - P26.
3. Encoder
The encoder converts the signal generated by power
source circuit into the pulse signal, and the pulse
signal is sent to the LSI.
source circuit into the pulse signal, and the pulse
signal is sent to the LSI.
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
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) Control Unit
(2) Switch Unit
(3) Encoder Unit
(2) Switch Unit
(3) Encoder Unit
The principal functions of these units and the signals
communicated among them are explained below.
communicated among them are explained below.
1. Control Unit
Signal of key touch and oven function control are all
processed by one microcomputer.
processed by one microcomputer.
1) Power Supply Circuit
This circuit changes output voltage at the secondary
side of the touch control transformer to voltages re-
quired at each part by full wave rectifying circuit,
constant voltage circuit, etc..
side of the touch control transformer to voltages re-
quired at each part by full wave rectifying circuit,
constant voltage circuit, etc..
2) Reset Circuit
This is an Auto-clear Circuit, i.e., a reset circuit, which
enables IC1 to be activated from initial state.
enables IC1 to be activated from initial state.
3) Power Synchronizing Signal Generating Circuit
This is a circuit for generating power synchronizing
signal by virtue of the secondary side output of touch
control transformer.
This signal is used for a basic frequency to time
processing and so on.
signal by virtue of the secondary side output of touch
control transformer.
This signal is used for a basic frequency to time
processing and so on.
4) Clock Circuit
This is a circuit for controlling clock frequency required
for operating I-1.
for operating I-1.
5) I-1 (Main Processor)
This is a one-chip microcomputer, responsible for
controlling the entire control unit.
controlling the entire control unit.
DESCRIPTION OF LSI
LSI(IXA222DR)
The I/O signal of the LSI(IXA222DR) is detailed in the following table.
The I/O signal of the LSI(IXA222DR) is detailed in the following table.
Pin No.
Signal
I/O
Description
1
VCC
IN
Power source voltage: GND.
VC voltage of power source circuit input. Connected to GND.
VC voltage of power source circuit input. Connected to GND.
2
VEE
IN
Anode (segment) of Fluorescent Display light-up voltage: -35V.
Vp voltage of power source circuit input.
Vp voltage of power source circuit input.
3
AVSS
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to DC. (-5V)
A reference voltage applied to the A/D converter in the LSI. Connected to DC. (-5V)
4
VREF
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.
5-6
AN7-AN6
IN
Terminal to switch the specification.
7
AN5
IN
Temperature measurement input: EXHAUST THERMISTOR
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
8
AN4
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal (0V).
Door opened; "L" level signal (-5.0V).
Door closed; "H" level signal (0V).
Door opened; "L" level signal (-5.0V).
9
AN3
-
Terminal not used.
R-23AM
16
10
AN2
IN
Temperature measurement input: MAGNETRON THERMISTOR TH2.
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
11
AN1
IN
Temperature measurement input: MAGNETRON THERMISTOR TH1.
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
12
AN0
-
Terminal not used.
13-14
P55-P54
-
Terminal not used.
15
P53
OUT
Magnetron (MG1) high-voltage circuit driving signal.
To turn on and off the cook relay. In 100% power level operation, "L" level during
cooking; "H" level otherwise. In other power level operation (50, 20 or 10%), "H" and
"L" level is repeated according to power level.
To turn on and off the cook relay. In 100% power level operation, "L" level during
cooking; "H" level otherwise. In other power level operation (50, 20 or 10%), "H" and
"L" level is repeated according to power level.
Power level
ON
OFF
100%
48sec.
0sec.
50%
26sec.
22sec.
20%
12sec.
36sec.
10%
8sec.
40sec.
16
P52
-
Terminal not used.
17
P51
OUT
Magnetron (MG2) high-voltage circuit driving signal.
To turn on and off the cook relay. In 100% power level operation, "L" level during
cooking; "H" level otherwise. In other power level operation (50, 20 or 10%), "H" and
"L" level is repeated according to power level.
To turn on and off the cook relay. In 100% power level operation, "L" level during
cooking; "H" level otherwise. In other power level operation (50, 20 or 10%), "H" and
"L" level is repeated according to power level.
Power level
ON
OFF
100%
48sec.
0sec.
50%
26sec.
22sec.
20%
12sec.
36sec.
10%
8sec.
40sec.
18
P50
-
Terminal not used.
19
P47
OUT
Signal to sound buzzer.
This signal is to control the 2.0kHz
continuous signal.
A: Switch touch sound.
This signal is to control the 2.0kHz
continuous signal.
A: Switch touch sound.
B: Completion sound.
20-21
P46-P45
-
Terminal not used.
22
P44
OUT
Oven lamp, Blower motor and Antenna motor driving signal (Square Wave-
form : 50Hz).
To turn on and off the shut-off relay (RY1).
The Square waveform voltage is delivered
to the RY1 relay driving circuit and relays
(RY3, RY4, COOK RELAY) control circuit.
form : 50Hz).
To turn on and off the shut-off relay (RY1).
The Square waveform voltage is delivered
to the RY1 relay driving circuit and relays
(RY3, RY4, COOK RELAY) control circuit.
23
P43
-
Terminal not used.
24
P42
IN
Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into P42.
When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into P42.
25
INT1
IN
Signal synchronized with commercial power source frequency.
This is basic timing for all time processing of LSI.
26
INT0
IN
Signal coming from encoder.
Signal similar to P42. Pulse signals are input into INT0.
Signal similar to P42. Pulse signals are input into INT0.
H
L
20 msec
During cooking
GND
-5V
20 msec.
OFF
ON
GND
-5V
48 sec.
OFF
ON
GND
-5V
48 sec.
OFF
ON
Pin No.
Signal
I/O
Description
A
B
0.12 sec
2.4 sec
GND
-5V
R-23AM
17
27
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily
set to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter
set at "H" level.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily
set to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter
set at "H" level.
28
P71
OUT
Memory (EEPROM) clock output.
29
P70
IN/OUT
Memory (EEPROM) data input/output.
30
XIN
IN
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
31
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Output to control oscillation input of XIN.
32
VSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
VC voltage of power source circuit input.
33
P27
-
Terminal not used.
34
P26
IN
Signal coming from switch unit.
When either one of G-1 line switches on switch matrix is touched, a corresponding
signal out of P30 - P31 will be input into P26. When no switch is touched, the signal
is held at "L" level.
When either one of G-1 line switches on switch matrix is touched, a corresponding
signal out of P30 - P31 will be input into P26. When no switch is touched, the signal
is held at "L" level.
35
P25
IN
Signal similar to P26.
When either one of G-2 line switches on switch matrix is touched, a corresponding
signal will be input into P25.
When either one of G-2 line switches on switch matrix is touched, a corresponding
signal will be input into P25.
36
P24
IN
Signal similar to P26.
When either one of G-3 lineswitches on switch matrix is touched, a corresponding
signal will be input into P24.
When either one of G-3 lineswitches on switch matrix is touched, a corresponding
signal will be input into P24.
37-40
P23-P20
OUT
Segment data signal.
The relation between signals and indicators are as follows:
The relation between signals and indicators are as follows:
Signal
Segment
Signal
Segment
Signal
Segment
P01 ..................... k
P21 ......................... h
P15 ..................... d
P02 ...................... j
P20 ......................... g
P14 ...................... c
P03 ...................... i
P17 ......................... f
P13 ..................... b
P23 .................. LB
P16 ......................... e
P12 ..................... a
P22 .................. UB
41-46
P17-P12
OUT
Segment data signal.
Signal similar to P23..
Signal similar to P23..
47-48
P11-P10
OUT
Digit selection signal.
The relation between digit signal and digit
are as follows:
Digit signal
are as follows:
Digit signal
Digit
P11 .................... 1st.
P10 ................... 2nd.
P07 .................... 3rd.
P06 .................... 4th.
P05 .................... 5th.
P04 .................... 6th.
P10 ................... 2nd.
P07 .................... 3rd.
P06 .................... 4th.
P05 .................... 5th.
P04 .................... 6th.
Normally, one pulse is output in every ß
period, and input to the grid of the Fluores-
cent Display.
period, and input to the grid of the Fluores-
cent Display.
49-52
P07-P04
OUT
Digit selection signal.
Signal similar to P11.
Signal similar to P11.
53-55
P03-P01
OUT
Segment data signal.
Signal similar to P23.
Signal similar to P23.
Pin No.
Signal
I/O
Description
GND
-31(V)
ß(50Hz)
H
L
GND
ß(50Hz)
P11
P10
P07
P06
P05
P04
GND
-31(V)
-31(V)
R-23AM
18
56
P00
-
Terminal not used.
57-58
P37-P36
OUT
(Sound) Voltage level control terminal.
This terminal (P37) is to control volume level of buzzer sound with terminals P36.
Since the volume level of buzzer sound depends on voltage energized, it is control
level in 3 steps by combining signal levels for P37 and P36. Relationship of signal
level combination to sound volume level is shown in the following table, 1~3 in the
table, however, are indicated in the descending order from the maximum level of
sound volume through the minimum level.
Since the volume level of buzzer sound depends on voltage energized, it is control
level in 3 steps by combining signal levels for P37 and P36. Relationship of signal
level combination to sound volume level is shown in the following table, 1~3 in the
table, however, are indicated in the descending order from the maximum level of
sound volume through the minimum level.
Sound Volume
P36
P37
1, (Max.)
L
L
2,
H
L
3, (Min.)
L
H
*At Output terminal P47, rectangular wave signal of 2.5kHz is output.
59
P35
-
Terminal not used.
60
P34
OUT
Terminal not used.
61
P33
OUT
Terminal not used.
62
P32
OUT
Terminal not used.
63
P31
OUT
Switch strobe signal.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals
while one of G-4 line switches on switch matrix is touched.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals
while one of G-4 line switches on switch matrix is touched.
64
P30
OUT
Switch strobe signal.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals
while one of G-5 line switches on switch matrix is touched.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals
while one of G-5 line switches on switch matrix is touched.
2-2 Memory IC (I-2)
CAT24WC16PI is a 16K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed
with 512 registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output
signal for IC2 are as shown in the following diagram.
with 512 registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output
signal for IC2 are as shown in the following diagram.
Figure T-2. Relation between Pin Nos, and Signals
Pin No.
Signal
I/O
Description
1-3
A0-A2
IN
Connected to GND.
4
VSS
IN
Connected to VC(-5V).
5
SDA
IN/OUT
Serial data input/output : input/outputs data to I-1.
6
SCL
IN
Clock signal input : input/outputs serial data at every one pulse.
7
TEST
IN
Connected to VC(-5V).
8
VCC
IN
Connected to GND.
FUNCTIONAL DIAGRAM
E PROM
512 x 8
2
START
STOP
LOGIC
CONTROL
LOGIC
SLAVE ADDRESS
REGISTER
COMPARATOR
H.V. GENERATION
TIMING
& CONTROL
64
YDEC
8
DATA REGISTER
Dout
CK
3
1
5
64
XDEC
START CYCLE
INC
LOAD
WORD
ADDRESS
COUNTER
COUNTER
R/W
PIN
Dout
ACK
ACK
(6) SCL
(5) SDA
(4) Vss
(3) Vcc
A0
8
1
7
2
6
3
5
4
A1
A2
VSS
VCC
TEST
SCL
SDA
TOP VIEW
Pin No.
Signal
I/O
Description
A
A : 1,(Max) 20V
2, 13V
3,(Min) 7V
2, 13V
3,(Min) 7V
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