Sharp R-64 (serv.man2) Service Manual ▷ View online
R-64STM -9
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
OUTLINE OF TOUCH CONTROL PANEL
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 Circuit
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 (tact switch touch sound and comple-
tion sound).
audible sounds (tact switch touch sound and comple-
tion sound).
6) Stop Switch
A switch to "tell" the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, fan motor, turntable motor,
grill heating element and light the oven lamp.
grill heating element and light the oven lamp.
8) 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.
9) Encoder
The encoder converts the signal generated by LSI into
the pulse signal, and the pulse signal is returned to the
LSI.
the pulse signal, and the pulse signal is returned to the
LSI.
10) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LED1-LED4)
LED1-LED4)
The touch control section consists of the following units.
(1) Switch Unit
(2) Control Unit
(2) Control Unit
The principal functions of these units and the signals
communicated among them are explained below.
communicated among them are explained below.
Switch Unit
The switch unit is composed of a matrix, signals
generated in the LSI are sent to the switch unit through
R60 and R61.
When a switch button is touched, a signal is completed
through the switch unit and passed back to the LSI
through R50, R51, R52 and R53 to perform the function
that was requested.
The switch unit is composed of a matrix, signals
generated in the LSI are sent to the switch unit through
R60 and R61.
When a switch button is touched, a signal is completed
through the switch unit and passed back to the LSI
through R50, R51, R52 and R53 to perform the function
that was requested.
Control Unit
Control unit consists of LSI, power source circuit, relay
circuit, back light circuit, synchronizing signal circuit, ACL
circuit, buzzer circuit and indicator circuit.
Control unit consists of LSI, power source circuit, relay
circuit, back light circuit, synchronizing signal circuit, ACL
circuit, buzzer circuit and indicator circuit.
1) LSI
This LSI controls the tact switch strobe signal, relay
driving signal for oven function and indicator signal.
driving signal for oven function and indicator signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control
unite.
unite.
Symbol
Voltage
Application
VC
+5V
LSI(IC1)
R-64STM -10
DESCRIPTION OF LSI
Pin No.
Signal
I/O
Description
A
B
0.1 sec.
2 sec.
H : +5V
L: 0V
H : +5V
L: 0V
(Grill or dual)
ON
OFF
During
cooking
L
GND
H.
20.0 msec
H : +5V
L : 0V
1-3
SEG21-
OUT
Terminal not used.
SEG23
4
COM1
OUT
Common data signal: COM1.
Connected to LCD (Pin No. 1)
Connected to LCD (Pin No. 1)
5
COM2
OUT
Common data signal: COM2.
Connected to LCD (Pin No. 2)
Connected to LCD (Pin No. 2)
6
COM3
OUT
Common data signal: COM3.
Connected to LCD (Pin No. 3)
Connected to LCD (Pin No. 3)
7
COM4
OUT
Terminal not used.
8
VLC
IN
Signal synchronized with commercial power source frequency.
Signal similar to VSS.
Signal similar to VSS.
9
VSS
IN
Power source voltage: 0V.
VSS voltage of power source circuit input.
VSS voltage of power source circuit input.
10
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.
11
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Output to control oscillation input of XIN.
12-15
K00-K03
IN
Terminal to change functions according to the Model.
DC voltage in accordance with the Model in operation is applied to set up its
function.
DC voltage in accordance with the Model in operation is applied to set up its
function.
16
TEST
IN
Connected to VC.
17
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.
18
HOLD
IN/OUT
Connected to VDD.
19
INT2
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time
processing of LSI.
processing of LSI.
20
R81
IN
Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And
pulse signals are input into R81.
When the encoder is turned, the contacts of encoder make pulse signals. And
pulse signals are input into R81.
21
INT1
IN
Signal coming from encoder.
Signal similar to R81. Pulse signals are input into INT1.
Signal similar to R81. Pulse signals are input into INT1.
22
R83
OUT
Terminal not used.
23
R90
IN
To input signal which communicates the door open/close information to
LSI.
Door open "L" level signal (0V). Door close "H" level (+5V)
LSI.
Door open "L" level signal (0V). Door close "H" level (+5V)
24-25
R91-R92
OUT
Terminal not used.
26
VDD
IN
Connected to GND.
27
R40
OUT
Signal to sound buzzer (2.0 kHz).
A: tact switch touch sound.
B: Completion sound.
28
R41
OUT
Grill heating element driving signsl.
To turn on and off the grill heating
element relay (RY2). "L" level during grill
cooking or dual cooking; "H" level otherwise.
To turn on and off the grill heating
element relay (RY2). "L" level during grill
cooking or dual cooking; "H" level otherwise.
LSI(IXA090DR)
The I/O signal of the LSI(IXA090DR) are detailed in the following table.
The I/O signal of the LSI(IXA090DR) are detailed in the following table.
R-64STM -11
DESCRIPTION OF LSI
LSI(IXA090DR)
The I/O signal of the LSI(IXA090DR) are detailed in the following table.
The I/O signal of the LSI(IXA090DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
ON/OFF time ratio in
Micro cooking
(a. 48second time base)
Micro cooking
(a. 48second time base)
ON/OFF time ratio in Mi-
cro cooking
(a. 32second time base)
cro cooking
(a. 32second time base)
MICRO
ON
OFF
COOK
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.
20.0 msec
During cooking
H : +5V
L : 0V
29
R42
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook
relay (RY3). 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 (RY3). 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.
30
R43
OUT
Oven lamp, fan motor and turntable motor driving signal.
To turn on and off shut off relay (RY1).
The square waveform voltage is
delivered to the RY1 driving circuit.
The square waveform voltage is
delivered to the RY1 driving circuit.
31
R50
IN
Signal coming from tact switch.
When tact switches SW1 is touched, a signal out of R61 will be input into R50.
When no tact switch is touched, the signal is held at "H" level.
When tact switches SW1 is touched, a signal out of R61 will be input into R50.
When no tact switch is touched, the signal is held at "H" level.
32
R51
IN
Signal coming from tact switch.
When either of tact switches SW2 and SW5 is touched, a corresponding signal
out of R60 and R61 will be input into R51. When no tact switch is touched, the
signal is held at "H" level.
When either of tact switches SW2 and SW5 is touched, a corresponding signal
out of R60 and R61 will be input into R51. When no tact switch is touched, the
signal is held at "H" level.
33
R52
IN
Signal coming from tact switch.
When either of tact switches SW3 and SW6 is touched, a corresponding signal
out of R60 and R61 will be input into R52. When no tact switch is touched, the
signal is held at "H" level.
When either of tact switches SW3 and SW6 is touched, a corresponding signal
out of R60 and R61 will be input into R52. When no tact switch is touched, the
signal is held at "H" level.
34
R53
IN
Signal coming from tact switch.
When either of tact switches SW4 and SW7 is touched, a corresponding signal
out of R60 and R61 will be input into R53. When no tact switch is touched, the
signal is held at "H" level.
When either of tact switches SW4 and SW7 is touched, a corresponding signal
out of R60 and R61 will be input into R53. When no tact switch is touched, the
signal is held at "H" level.
35
R60
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R51, R52 or R53
terminal while the tact switch SW5, SW6 or SW7 is touched.
Signal applied to tact switch section. A pulse signal is input to R51, R52 or R53
terminal while the tact switch SW5, SW6 or SW7 is touched.
36
R61
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R50, R51, R52
or R53 terminal while the tact switch SW1, SW2, SW3 or SW4 is touched.
Signal applied to tact switch section. A pulse signal is input to R50, R51, R52
or R53 terminal while the tact switch SW1, SW2, SW3 or SW4 is touched.
37-38
R62-R63
OUT
Terminal not used.
39-42
R70-R73
OUT
Terminal not used.
43-54
SEG0 -
OUT
Segment data signal.
SEG11
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)
55-57
SEG12-
OUT
Terminal not used.
SEG14
58
VDD
IN
Power source voltage input terminal.
Connected to GND.
Connected to GND.
59-64
SEG15-
OUT
Terminal not used.
SEG20
R-64STM -12
SERVICING
touch control panel while keeping it connected
to the oven.
to the oven.
B. On some models, the power supply cord be-
tween the touch control panel and the oven is
long enough that they may be separated from
each other. For those models, therefore, it is
possible to check and repair the controls of the
touch control panel while keeping it apart from
the oven ; in this case you must short both ends
of the door sensing switch (on PWB) of the touch
control panel with a jumper, which brings about
an operational state that is equivalent to the
oven door being closed. As for the sensor-
related controls of the touch control panel, check-
ing them is possible if the dummy resistor(s) with
resistance equal to that of the controls are used.
long enough that they may be separated from
each other. For those models, therefore, it is
possible to check and repair the controls of the
touch control panel while keeping it apart from
the oven ; in this case you must short both ends
of the door sensing switch (on PWB) of the touch
control panel with a jumper, which brings about
an operational state that is equivalent to the
oven door being closed. As for the sensor-
related controls of the touch control panel, check-
ing them is possible if the dummy resistor(s) with
resistance equal to that of the controls are used.
(2) Servicing the touch control panel with power
supply from an external power source:
Disconnect the touch control panel completely from
the oven, and short both ends of the door sensing
switch (on PWB) of the touch control panel, which
brings about an operational state that is equivalent
to the oven door being closed. Connect an external
power source to the power input terminal of the
touch control panel, then it is possible to check and
repair the controls of the touch control panel; it is
also possible to check the sensor-related controls
of the touch control panel by using the dummy
resistor(s).
Disconnect the touch control panel completely from
the oven, and short both ends of the door sensing
switch (on PWB) of the touch control panel, which
brings about an operational state that is equivalent
to the oven door being closed. Connect an external
power source to the power input terminal of the
touch control panel, then it is possible to check and
repair the controls of the touch control panel; it is
also possible to check the sensor-related controls
of the touch control panel by using the dummy
resistor(s).
4. Servicing Tools
Tools required to service the touch control panel as-
sembly.
1) Soldering iron: 30W
sembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC -
10MHz type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control
unit, remove the aluminium foil applied for prevent-
ing static electricity.
ing static electricity.
2) Connect the connector of the key unit to the control
unit being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that
abnormal voltage due to static electricity etc. is not
applied to the input or output terminals.
applied to the input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to
PWB, making sure that all connections are tight.
5) Be sure to use specified components where high
precision is required.
E
C
B
Transistor
2SB1238
2SB1238
Transistor
DTA123ES
KRA101M
KRA223M
KRC243M
DTA123ES
KRA101M
KRA223M
KRC243M
E
C B
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following pre-
cautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electric-
ity charge in clothes, etc., and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap
circuits. When handling these parts, the following pre-
cautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electric-
ity charge in clothes, etc., and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap
them in aluminium foil. Also wrap PW boards con-
taining them in aluminium foil.
taining them in aluminium foil.
2) When soldering, ground the technician as shown in
the figure and use grounded soldering iron and
work table.
work table.
approx. 1M ohm
2. Shapes of Electronic Components
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so.
To perform the servicing, power to the touch control
panel is available either from the power line of the oven
or from an external power source.
touch control panel of the microwave oven and the
precautions you must take when doing so.
To perform the servicing, power to the touch control
panel is available either from the power line of the oven
or from an external power source.
(1) Servicing the touch control panel with power
supply of the oven :
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD .
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD .
Therefore, when checking the performance of the
touch control panel, put the outer cabinet on the
oven to avoid touching the high voltage trans-
former, or unplug the primary terminal (connector)
of the high voltage transformer to turn it off; the end
of such connector must be insulated with an insulat-
ing tape. After servicing, be sure to replace the
leads to their original locations.
touch control panel, put the outer cabinet on the
oven to avoid touching the high voltage trans-
former, or unplug the primary terminal (connector)
of the high voltage transformer to turn it off; the end
of such connector must be insulated with an insulat-
ing tape. After servicing, be sure to replace the
leads to their original locations.
A. On some models, the power supply cord be-
tween the touch control panel and the oven is so
short that the two can't be separated.
short that the two can't be separated.
For those models, check and repair all the
controls (sensor-related ones included) of the
controls (sensor-related ones included) of the
Click on the first or last page to see other R-64 (serv.man2) service manuals if exist.