Sharp R-21ATP Service Manual ▷ View online
R-21ATP
15
25
INT1
IN
Signal synchronized with commercial power source frequency.
This is basic timing for all time processing of LSI.
This is basic timing for all time processing of LSI.
26
P40
IN
Connected to GND through resistor.
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
Connected to GND.
33
P27
IN
Signal coming from touch key.
When either one of G-12 line keys on key matrix is touched, a corresponding signal
out of P30, P31, P32, P33, P34 will be input into P27. When no key is touched, the
signal is held at "L" level.
When either one of G-12 line keys on key matrix is touched, a corresponding signal
out of P30, P31, P32, P33, P34 will be input into P27. When no key is touched, the
signal is held at "L" level.
34
P26
IN
Signal similar to P27.
When either one of G-11 line keys on key matrix is touched, a corresponding signal
will be input into P26.
When either one of G-11 line keys on key matrix is touched, a corresponding signal
will be input into P26.
35
P25
IN
Signal similar to P27.
When either one of G-10 line keys on key matrix is touched, a corresponding signal
will be input into P25.
When either one of G-10 line keys on key matrix is touched, a corresponding signal
will be input into P25.
36
P24
IN
Signal similar to P27.
When either one of G-9 line keys on key matrix is touched, a corresponding signal
will be input into P24.
When either one of G-9 line keys on key matrix is touched, a corresponding signal
will be input into P24.
37-38
P23-P22
OUT
Terminal not used.
39-40
P21-P20
OUT
Segment data signals.
The relation between signals and indicators are as follows:
The relation between signals and indicators are as follows:
Signal
Segment
Signal
Segment
P21,P20 ........ 1
P05,P04 .......... 7
P17.P16 ........ 2
P03,P02 .......... 8
P15,P14 ........ 3
P01,P00 .......... 9
P13,P12 ........ 4
P11,P10 ........ 5
P07,P06 ........ 6
P11,P10 ........ 5
P07,P06 ........ 6
41-48
P17-P10
OUT
Segment data signal.
Signal similar to P21.
Signal similar to P21.
49-56
P07-P00
OUT
Segment data signal.
Signal similar to P21.
Signal similar to P21.
57-59
P37-P35
OUT
Terminal not used.
60
P34
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and
P24 terminals while one of G4 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and
P24 terminals while one of G4 line keys on key matrix is touched.
61
P33
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and
P24 terminals while one of G5 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and
P24 terminals while one of G5 line keys on key matrix is touched.
62
P32
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and
P24 terminals while one of G6 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and
P24 terminals while one of G6 line keys on key matrix is touched.
63
P31
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and
P24 terminals while one of G7 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and
P24 terminals while one of G7 line keys on key matrix is touched.
64
P30
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25
and P24 terminals while one of G8 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25
and P24 terminals while one of G8 line keys on key matrix is touched.
Pin No.
Signal
I/O
Description
H : +5V
L : GND
20 msec
+5V
GND
ß(50Hz)
16
R-21ATP
When the memory IC (IC2) or control unit is exchanged, input the relay timing to the memory IC (IC2), referring to the
"How to input the relay timing". Otherwise the oven will make a big noise when starting.
"How to input the relay timing". Otherwise the oven will make a big noise when starting.
How to input the relay timing
... Flashing / ... 0.1sec BUZZER
PAD
DISPLAY
INDICATOR
PHONE
(Door close)
.
.
CHECK
.
CHECK No.
CHECK
8 2 6 8
CHECK
(user total count)
SIGNAL
SIGNAL
DOUBLE
3 4 5 6
QUANTITY
(service total count upper figure 3456XX)
7
7
No.
(after 1 sec.)
3 8 6 9
SET
0
3. 8. 4. 9
3 8 4 9
x 4
SET
3 8 4 9
CHECK
.
AT24C02 is a 2K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with
256 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.
256 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.
Memory IC (IC2)
Table 1. Relation between Pin Nos, and Signals
Pin No.
Signal
I/O
Description
1-3
A0-A2
IN
Connected to +5V.
4
VSS
IN
Connected to GND.
5
SDA
IN/OUT
Serial data input/output : input/outputs data to IC1.
6
SCL
IN
Clock signal input : input/outputs sireal data at every one pulse.
7
TEST
IN
Connected to GND.
8
VCC
IN
Connected to +5V.
FUNCTIONAL DIAGRAM
E PROM
256 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
A1
A2
VSS
VCC
TEST
SCL
SDA
TOP VIEW
R-21ATP
17
IC
KIA7805P1
KIA7805P1
TOUCH CONTROL PANEL SERVICING
4) Re-install the outer case (cabinet).
5) Re-connect the power supply cord after the outer
5) Re-connect the power supply cord after the outer
case is installed.
6) Run the oven and check all functions.
A. On some models, the power supply cord between the
touch control panel and the oven itself is so short that
the two can’t be separated. For those models, check
and repair all the controls (sensor-related ones in-
cluded) of the touch control panel while keeping it
connected to the oven.
the two can’t be separated. For those models, check
and repair all the controls (sensor-related ones in-
cluded) of the touch control panel while keeping it
connected to the oven.
B. On some models, the power supply cord between the
touch control panel and the oven proper 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 proper; 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, checking them is possible if dummy
resistor(s) with resistance equal to that of the controls
are used.
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 proper; 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, checking them is possible if dummy
resistor(s) with resistance equal to that of the controls
are used.
(2) Servicing the touch control panel with power sup-
ply from an external power source:
Disconnect the touch control panel completely from the
oven proper, 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 proper, 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.
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,
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing static
electricity.
electricity.
2) Connect the connectors 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 abnor-
mal voltage due to static electricity etc. is not applied to
the input or output terminals.
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.
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following
precautions 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.
circuits. When handling these parts, the following
precautions 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 all PW boards containing
them in aluminium foil.
them in aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table.
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 itself 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 itself or
from an external power source.
(1) Servicing the touch control panel with power sup-
ply of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE MI-
CROWAVE OVEN IS STILL LIVE DURING SERVIC-
ING PRESENTS A HAZARD.
Therefore, before checking the performance of the
touch control panel,
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE MI-
CROWAVE OVEN IS STILL LIVE DURING SERVIC-
ING PRESENTS A HAZARD.
Therefore, before checking the performance of the
touch control panel,
1) Disconnect the power supply cord, and then re-
move outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power
transformer.
5) Ensure that these leads remain isolated from
other components and oven chassis by using
insulation tape.
insulation tape.
6) After that procedure, re-connect the power supply
cord.
After checking the performance of the touch control
panel,
panel,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the power
2) Open the door and block it open.
3) Re-connect the leads to the primary of the power
transformer.
E
C B
approx. 1M ohm
Transistor
DTA123ES
DTB143ES
DTC143ES
DTD143ES
KRA223M
KRC101M
KRC243M
DTA123ES
DTB143ES
DTC143ES
DTD143ES
KRA223M
KRC101M
KRC243M
3
2
1
18
R-21ATP
3) Practice for inputting total using times (Ex. 310000
times).
... Flashing / ... 0.1sec BUZZER
PAD
DISPLAY
INDICATOR PHONE
(Door close)
.
.
.
CHECK
.
CHECK No.
CHECK
82 68
CHECK
(user total count)
SIGNAL
SIGNAL
DOUBLE
SIGNAL
DOUBLE
34 56
QUANTITY
(service total count upper figure)
3456XX
2
2
No.
(after 1 sec.)
78
(service total count lower figure)
XXXX78
1
1
No.
(after 1 sec.)
34 56
SET
0
3,1,0,0
31 00
x 4
SET
31 00
2
2
No.
(after 1 sec.)
78
SET
0
0
0
SET
0
(service total count 310000 set)
CHECK
.
PROCEDURE FOR CHECKING/CLEARING
SERVICE COUNTS OF MICROWAVE OVEN
SERVICE COUNTS OF MICROWAVE OVEN
The following procedure enables the servicer to obtain the
total using times (cook cycles) since the microwave oven
is purchased and the total operation time (hours) since the
microwave oven is purchased. The maximum capacity of
the total using is 999,999 times, and the maximum
capacity of total operation time is 999,999 hours.
total using times (cook cycles) since the microwave oven
is purchased and the total operation time (hours) since the
microwave oven is purchased. The maximum capacity of
the total using is 999,999 times, and the maximum
capacity of total operation time is 999,999 hours.
1) Practice for checking total using times (Ex. 345678
times).
times).
... Flashing / ... 0.1sec BUZZER
PAD
DISPLAY
INDICATOR PHONE
(Door close)
.
.
CHECK
.
CHECK No.
CHECK
82 68
CHECK
(user total count)
SIGNAL
SIGNAL
DOUBLE
34 56
QUANTITY
(service total count upper figure)
3456XX
1 (No 1)
1
No.
(after 1 sec.)
34 56
(service total count upper figure)
2 (No 2)
2
No.
(after 1 sec.)
78
(service total count lower figure)
CHECK
.
2) Practice for checking total operation time (Ex. 4567
hours).
... Flashing / ... 0.1sec BUZZER
PAD
DISPLAY
INDICATOR PHONE
(Door close)
.
.
CHECK
.
CHECK No.
CHECK
82 68
CHECK
(user total count)
SIGNAL
SIGNAL
DOUBLE
34 56
QUANTITY
(service total count upper figure)
3456XX
9 (No 9)
9
No.
(after 1 sec.)
45
(Total operation time upper figure)
0 (No 0)
0
No.
(after 1 sec.)
67
(Total operation time lower figure)
CHECK
.
4) Practice for inputting total operation time (Ex. 1234
hours).
... Flashing / ... 0.1sec BUZZER
PAD
DISPLAY
INDICATOR PHONE
(Door close)
.
.
.
CHECK
.
CHECK No.
CHECK
82 68
CHECK
(user total count)
SIGNAL
SIGNAL
DOUBLE
SIGNAL
DOUBLE
34 56
QUANTITY
(service total count upper figure)
3456XX
9
9
No.
(after 1 sec.)
45
SET
0
1,2
12
x 2
SET
12
0
10
No.
(after 1 sec.)
67
SET
0
3,4
34
x 2
SET
34
(Total operation time 1234 hours set)
CHECK
.
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