Sharp R-2398G Service Manual ▷ View online
19
R-2398
out of P11, P12, P14 - P17 will be input into R3. When no key is touched, the signal
is held at "L" level.
is held at "L" level.
35
R2
IN
Signal similar to R3.
When either one of G-11 line keys on key matrix is touched, a corresponding signal
will be input into R2.
When either one of G-11 line keys on key matrix is touched, a corresponding signal
will be input into R2.
36
R1
IN
Signal similar to R3.
When either one of G-10 line keys on key matrix is touched, a corresponding signal
will be input into R1.
When either one of G-10 line keys on key matrix is touched, a corresponding signal
will be input into R1.
37
R0
IN
Signal similar to R3.
When either one of G-9 line keys on key matrix is touched, a corresponding signal
will be input into R0.
When either one of G-9 line keys on key matrix is touched, a corresponding signal
will be input into R0.
38
VP
IN
Anode (segment) of Fluorescent Display light-up voltage: -31V.
Vp voltage of power source circuit input.
Vp voltage of power source circuit input.
39
P17
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
P24 ...................... i
P13 ......................... f
P23 ................... j,k
P12 ........................ e
P17 .................. LB
P11 ........................ d
P16 .................. UB
P10 ........................ c
P15 ..................... h
P07 ........................ b
P14 ..................... g
P06 ........................ a
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-6 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-6 line keys on key matrix is touched.
40
P16
OUT
Segment data signal.
Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-5 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-5 line keys on key matrix is touched.
41
P15
OUT
Segment data signal.
Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-4 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-4 line keys on key matrix is touched.
42-43
P14-P13
OUT
Segment data signal.
Signal similar to P17.
44
P12
OUT
Segment data signal.
Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-8 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-8 line keys on key matrix is touched.
45
P11
OUT
Segment data signal.
Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-7 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while
one of G-7 line keys on key matrix is touched.
46
P10
OUT
Segment data signal.
Signal similar to P17.
47-48
P07-P06
OUT
Segment data signal.
Signal similar to P17.
49
P05
OUT
Digit selection signal.
The relation between digit signal and digit are
as follows:
The relation between digit signal and digit are
as follows:
Digit signal
Digit
P05 .................... 1st.
P04 ................... 2nd.
P03 .................... 3rd.
P02 .................... 4th.
P01 .................... 5th.
P00 .................... 6th.
P04 ................... 2nd.
P03 .................... 3rd.
P02 .................... 4th.
P01 .................... 5th.
P00 .................... 6th.
Normally, one pulse is output in every ß
period, and input to the grid of the Fluorescent
Display.
period, and input to the grid of the Fluorescent
Display.
GND
-31(V)
ß(50Hz)
Pin No.
Signal
I/O
Description
H
L
GND
ß(50Hz)
P05
P04
P03
P02
P01
P00
GND
-31(V)
-31(V)
20
R-2398
2-2 Memory IC (IC2)
AT24C04 is a 4K-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.
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 IC1.
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.
A0
8
1
7
2
6
3
5
4
A1
A2
VSS
VCC
TEST
SCL
SDA
TOP VIEW
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
50-54
P04-P00
OUT
Digit selection signal.
Signal similar to P16.
Signal similar to P16.
55-57
P27-P25
OUT
Terminal not used.
58-59
P24-P23
OUT
Segment data signal.
Signal similar to P17.
60
P22
OUT
(Sound) Voltage level control terminal.
This terminal (P22) is to control volume level of buzzer sound with terminals P21.
Since the volume level of buzzer sound depends on voltage energized, it is control
level in 3 steps by combining signal levels for P22, P21. 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.
This terminal (P22) is to control volume level of buzzer sound with terminals P21.
Since the volume level of buzzer sound depends on voltage energized, it is control
level in 3 steps by combining signal levels for P22, P21. 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
P21
P22
1, (Max.)
L
L
2,
H
L
3, (Min.)
L
H
*At Output terminal P32, rectangular wave signal of 2.5kHz is output.
61
P21
OUT
Sound level control signal.
Refer to above signal P22.
Refer to above signal P22.
62
P20
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal(0V).
Door opened; "L" level signal(-31.0V).
Door opened; "L" level signal(-31.0V).
63/64
AVCC/VCC
IN
Connected to GND.
Pin No.
Signal
I/O
Description
A
A : 1,(Max) 20V
2, 13V
3,(Min) 7V
2, 13V
3,(Min) 7V
21
R-2398
approx. 1M ohm
SERVICING
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.
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 supply 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 assem-
bly.
bly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
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 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.
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 preci-
sion 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 pre-
cautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output termi-
nals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
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 pre-
cautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output termi-
nals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
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.
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 avail-
able 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 avail-
able either from the power line of the oven itself or from
an external power source.
(1) Servicing the touch control panel with power supply
of the oven:
CAUTION:
THE HIGH VOLTAGE TRANS-
FORMER OF THE MICROWAVE OVEN
IS STILL LIVE DURING SERVICING
PRESENTS A HAZARD.
IS STILL LIVE DURING SERVICING
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 transformer, or unplug the
primary terminal (connector) of the high voltage trans-
former to turn it off; the end of such connector must be
insulated with an insulating tape. After servicing, be sure
to replace the leads to their original locations.
control panel, put the outer cabinet on the oven to avoid
touching the high voltage transformer, or unplug the
primary terminal (connector) of the high voltage trans-
former to turn it off; the end of such connector must be
insulated with an insulating tape. After servicing, be sure
to replace the leads to their original locations.
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 included) of
the touch control panel while keeping it connected to the
oven.
two can’t be separated. For those models, check and
repair all the controls (sensor-related ones included) 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
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
E
C B
E
C
B
E
C
B
Transistor
2SA933ASTP
DTA114YSA
DTB143ES
DTD143ES
KRA101M
2SA933ASTP
DTA114YSA
DTB143ES
DTD143ES
KRA101M
Transistor
2SB1238
2SB1238
Transistor
2SB953
2SB953
22
R-2398
PROCEDURE FOR ENTERING TO IC-2
When the control unit or IC-2 is exchanged, re-enter the
constans of EXPRESS DEFROST, the memory information
and the EEPROM data, referring to the following procedures.
If not so, the oven will not operate correctly.
constans of EXPRESS DEFROST, the memory information
and the EEPROM data, referring to the following procedures.
If not so, the oven will not operate correctly.
1) How to enter the constants of EXPRESS DEFROST.
T = STG1 + STG2 + STG3
STG = A X T + B
STG1= 0.20 X T + 20 Power level 40%
STG2= 0.13 X T + 30 Power level 30%
STG3= 0.67 X T - 50 Power level 20%
STG = A X T + B
STG1= 0.20 X T + 20 Power level 40%
STG2= 0.13 X T + 30 Power level 30%
STG3= 0.67 X T - 50 Power level 20%
" " : Flicker / : 0.1 sec BUZZER
PAD ORDER
DISPLAY
PHONE
(Door close)
•
SET
•
SET
"NUMBER"
•
(within 2 sec.)
#1
START
"NUMBER"
•
EXPRESS DEFROST
1
0.00 DEF
2, 0
1
0.20 DEF
x 2
(A)
MANUAL/ REPEAT
1
0 DEF
2
1
0.20 DEF
#2
(+ - B)
DEF "POWER"
SELECT POWER
1
20
100%
DEF
POWER
4
1
20
40%
MANUAL/ REPEAT
2
0.00 DEF
1, 3
2
0.13 DEF
x 2
(A)
MANUAL/ REPEAT
2
0 DEF
3
2
30 DEF
(+ - B)
DEF "POWER"
SELECT POWER
2
30
100%
DEF
POWER
3
2
30
30%
MANUAL/ REPEAT
3
0 DEF
#3
5
3
5 DEF
"CHECK"
DEF "POWER"
SELECT POWER
3
5
100%
DEF
POWER
2
3
5
20%
SET
4
• DEF
SET
•
#1: No key entry signal.
#2: To set -B, touch the SELECT POWER key twice.
#3: Ex. "CHECK" will flash and the oven will beep after 50%
#2: To set -B, touch the SELECT POWER key twice.
#3: Ex. "CHECK" will flash and the oven will beep after 50%
of EXPRESS DEFROST time has lapsed when 5 key is
entered.
entered.
Constants of
EXPRESS
DEFROST.
EXPRESS
DEFROST.
2) How to enter the memory information
Example: Suppose cooking time 10 sec. and output power
100% are entered into the memory pad 1.
PROCEDURE FOR CHECKING/CLEARING SERV-
ICE COUNTS OF MICROWAVE OVEN
ICE COUNTS OF MICROWAVE OVEN
The following procedure enables the servicer to obtain the
total service counts (cook cycles) for memory cooking, manual,
repeat, double quantity cooking and defrost. The maximum
capacity of the counter is 999,999 counts, above which the
counter will reset to "0". The counter will retain the total counts
(will not clear) in the event of a power disruption.
total service counts (cook cycles) for memory cooking, manual,
repeat, double quantity cooking and defrost. The maximum
capacity of the counter is 999,999 counts, above which the
counter will reset to "0". The counter will retain the total counts
(will not clear) in the event of a power disruption.
1) Practice for checking total service counts
(eg; 234,567 Counts).
(eg; 234,567 Counts).
--- flashing / ---0.1sec. BUZZER
PAD
DISPLAY
INDICATOR LED PHONE
(door close)
•
•
CHECK
NUMBER
•
CHECK
CHECK
#1
82 68
CHECK
(user total count)
#2
SIGNAL
SIGNAL
DOUBLE
2 34 56 7
QUANTITY
(service total count)
1
NUMBER
1
(after 1 sec.)
45
(filter used time)
2
NUMBER
2
(after 1 sec.)
2 00
(filter lim. time)
0 (No 10)
NUMBER 10
(after 1 sec.)
35 43 2
(service total cook time)
CHECK
•
#1: Denotes total service counts within the reach of user, of
which checking and clearing practices are described in
this instruction manual.
this instruction manual.
#2: Denotes the procedure for the servicer to disable check-
ing/clearing. This procedure is instructed to service per-
sonnel only and is excluded from the operation manual.
sonnel only and is excluded from the operation manual.
2) Practice for clearing Service's counts
" " : Flicker / : 0.1 sec BUZZER
PAD ORDER
DISPLAY
PHONE
(Door close)
•
CHECK
"NUMBER"
• CHECK
CHECK
82 68 "CHECK"
(User's Total Counts)
#1 SIGNA
L
82 68 "CHECK"
SIGNAL
82 68 "CHECK"
DOUBLE QUANTITY
2 34 56 7 "CHECK"
(Total Counts Service)
SET
0 "CHECK"
0
0 "CHECK"
SET
0 "CHECK"
CHECK
•
#1: Denotes the procedure for the servicer to disable clearing.
This procedure is instructed to service personnel only and
is excluded from the operation manual.
is excluded from the operation manual.
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