Sharp R-82FBSTM (serv.man2) Service Manual ▷ View online
R-82FBSTM - 21
Pin No.
Signal
I/O
Description
26
P40
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P50-P53 terminal
while one of G7 line key on matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P50-P53 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 P50-P53 terminal
while one of G6 line key on matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P50-P53 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 P50-P53 terminal
while one of G5 line key on matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P50-P53 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 P50-P53 terminal
while one of G4 line key on matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P50-P53 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 P50-P53 terminal
while one of G3 line key on matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P50-P53 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 P50-P53 terminal
while one of G2 line key on matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P50-P53 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 P50-P53 terminal
while one of G1 line key on matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P50-P53 terminal
while one of G1 line key on matrix is touched.
33
P71
IN/OUT
Terminal not used.
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.
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.
36
XCIN
IN
Connected to VC.
37
XCOUT
OUT
Terminal not used.
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 XOUT terminal.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XOUT terminal.
39
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Output to control oscillation input of XIN.
40
VSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
VC voltage of power source circuit input.
41
P27
OUT
Bottom heating element driving signal.
To turn on and off the relay (RY4). “L” level during grill
cooking, convection cooking or dual cooking, “H”
level otherwise. The heater relay turns on and off
within a 54 second time base in accordance with the
special program in LSI.
To turn on and off the relay (RY4). “L” level during grill
cooking, convection cooking or dual cooking, “H”
level otherwise. The heater relay turns on and off
within a 54 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.)
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.)
43
P25
OUT
Fan motor driving signal.
To turn on and off the fan motor relay (RY6).
“L” level during cooking, or for a while after
convection or dual cooking. “H” level otherwise.
To turn on and off the fan motor relay (RY6).
“L” level during cooking, or for a while after
convection or dual cooking. “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.
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.
ON
OFF
During
cooking
L
GND
H.
(Grill, Convection, Dual )
ON
OFF
During
cooking
L
GND
H.
( Convection or Dual cooking )
ON
OFF
During cooking, or for a while
after convection or dual cooking.
L
GND
H.
The I/O signal of the LSI are detailed in the following table.
DESCRIPTION OF LSI
R-82FBSTM - 22
46
P22
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.
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.
47
P21
OUT
Grill (TOP) heating element driving signal.
To turn on and off the grill heating element relay
(RY3). “L” level during grill cooking, convection
cooking or dual cooking. “H” level otherwise. The
heater relay turns on and off within a 54 second time
base in accordance with the special progrom in LSI.
To turn on and off the grill heating element relay
(RY3). “L” level during grill cooking, convection
cooking or dual cooking. “H” level otherwise. The
heater relay turns on and off within a 54 second time
base in accordance with the special progrom in LSI.
48
P20
OUT
Oven lamp and turntable motor driving signal(Square Waveform : 50Hz).
To turn on and off shut-off relay (RY1).
The square waveform voltage is
delivered to the relay (RY1) driving
circuit.
To turn on and off shut-off relay (RY1).
The square waveform voltage is
delivered to the relay (RY1) driving
circuit.
49-50
P17-P16
OUT
Terminal not used.
51-80
SEG39-SEG10
OUT
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
Connected to LCD.
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.
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).
Connected to LCD (Pin No. 35).
96
COM1
OUT
Common data signal: COM2.
Connected to LCD (Pin No. 34).
Connected to LCD (Pin No. 34).
97
COM0
OUT
Common data signal: COM1.
Connected to LCD (Pin No. 33).
Connected to LCD (Pin No. 33).
98-99
VL3-VL2
IN
Power source voltage input terminal.
Standard voltage for LCD.
Standard voltage for LCD.
100
C2
IN
Terminal not used.
Pin No.
Signal
I/O
Description
During cooking
L
H
20 msec.
ON
OFF
During
cooking
L
GND
H.
(Grill, Convection, Dual )
MICRO
ON
OFF
COOK
100%
54 sec.
0 sec.
70%
40 sec.
14 sec.
50%
29 sec.
25 sec.
30%
18 sec.
36 sec.
10%
9 sec.
45 sec.
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.
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
cooking
(a. 32second time base)
ON/OFF time ratio in Micro
cooking
(a. 54second time base)
cooking
(a. 54second time base)
The I/O signal of the LSI are detailed in the following table.
DESCRIPTION OF LSI
R-82FBSTM - 23
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 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
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 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 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 pre-
cautions 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 pre-
cautions 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
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 .
T
herefore, before checking the performance of the touch
control panel,
1) Disconnect the power supply cord, and then remove
1) Disconnect the power supply cord, and then remove
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.
tape.
6) After that procedure, re-connect the power supply
cord.
After checking the performance of the touch control
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.
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.
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.
(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 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, checking them is possible if the
dummy resistor(s) with resistance equal to that of the
controls are used.
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, checking 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).
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 assem-
bly.
1) Soldering iron: 30W
bly.
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 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 abnor-
mal voltage due to static electricity etc. is not applied
to the input or output terminals.
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
approx. 1M ohm
Transistor
KRC243M
KTA1274
KRC243M
KTA1274
R-82FBSTM - 24
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
The "Control, Switch, LED, and Relay PWB" of this model employ lead-free solder. This is indicated by the "LF"
symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder.
Example:
symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder.
Example:
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
When repairing a PWB with the "LF" symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder
may result in cold soldered joints and damage to printed patterns.)
As the melting point of lead-free solder is approximately 40˚C higher than tin/lead alloy solder, it is recommend that
a dedicated bit is used, and that the iron temperature is adjusted accordingly.
may result in cold soldered joints and damage to printed patterns.)
As the melting point of lead-free solder is approximately 40˚C higher than tin/lead alloy solder, it is recommend that
a dedicated bit is used, and that the iron temperature is adjusted accordingly.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer wettability, (flow), to prevent damage
to the land of the PWB, extreme care should be taken not to leave the bit in contact with the PWB for an extended
period of time. Remove the bit as soon as a good flow is achieved. The high content of tin in lead free solder will cause
premature corrosion of the bit. To reduce wear on the bit, reduce the temperature or turn off the iron when it is not
required.
Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their
characteristics, making good soldering more difficult. It will be necessary to clean and replace bits more often when
using lead-free solder. To reduce bit wear, care should be taken to clean the bit thoroughly after each use.
to the land of the PWB, extreme care should be taken not to leave the bit in contact with the PWB for an extended
period of time. Remove the bit as soon as a good flow is achieved. The high content of tin in lead free solder will cause
premature corrosion of the bit. To reduce wear on the bit, reduce the temperature or turn off the iron when it is not
required.
Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their
characteristics, making good soldering more difficult. It will be necessary to clean and replace bits more often when
using lead-free solder. To reduce bit wear, care should be taken to clean the bit thoroughly after each use.
Sn-Ag-Cu
Click on the first or last page to see other R-82FBSTM (serv.man2) service manuals if exist.