Sharp R-84ST (serv.man3) Service Manual ▷ View online
R-84STM - 13
TOUCH CONTROL / DESCRIPTION OF LSI
LSI(IXA094DR)
The I/O signal of the LSI(IXA094DR) are detailed in the following table.
The I/O signal of the LSI(IXA094DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
Power output
ON time
OFF time
100 %
48 sec.
0 sec.
90 %
44 sec.
4 sec.
80 %
40 sec.
8 sec.
70 %
36 sec.
12 sec.
60 %
32 sec.
16 sec.
50 %
26 sec.
22 sec.
40 %
22 sec.
26 sec.
30 %
16 sec.
32 sec.
20 %
12 sec.
36 sec.
10 %
8 sec.
40 sec.
ON
OFF
During
cooking
L
GND
H.
(Convection or dual cooking)
ON
OFF
During cooking or for awhile after convection,
grill (top and bottom grill ) or dual.
grill (top and bottom grill ) or dual.
L
GND
H.
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 48 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 48 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, grill (top and bottom grill) 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, grill (top and bottom grill) 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 3 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 3 minutes, the relay RY5 will be turned off. The relay RY5 will be
turned on when the oven door is opened and closed.
46-48
P22-P20
OUT
Terminal not used.
49-50
P17-P16
IN
Terminal to change functions according to the model.
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)
R-84STM - 14
TOUCH CONTROL / DESCRIPTION OF LSI
LSI(IXA094DR)
The I/O signal of the LSI(IXA094DR) are detailed in the following table.
The I/O signal of the LSI(IXA094DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
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
Common data signal: COM3.
Connected to LCD (Pin No. 35).
Connected to LCD (Pin No. 35).
95
COM2
OUT
Common data signal: COM2.
Connected to LCD (Pin No. 34).
Connected to LCD (Pin No. 34).
96
COM1
OUT
Common data signal: COM1.
Connected to LCD (Pin No. 33).
Connected to LCD (Pin No. 33).
97
COM0
OUT
Terminal not used.
98-99
VL3-VL2
IN
Power source voltage input terminal.
Standard voltage for LCD.
Standard voltage for LCD.
100
C2
IN
Terminal not used.
R-84STM - 15
SERVICING
transformer.
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).
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 assembly.
1) Soldering iron: 30W
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 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
precision is required.
E
C B
Transistor
2SB1238
2SB1238
Transistor
KRC243M
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 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.
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 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
supply of the oven :
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING SERV-
ICING AND PRESENTS A HAZARD .
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING SERV-
ICING AND PRESENTS A HAZARD .
Therefore, before checking the performance of the touch
control panel,
1) Disconnect the power supply cord, and then remove
control panel,
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
R-84STM - 16
MONITORED LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT
Then check the lower latch hook position, pushing and
pulling lower portion of door toward the oven face. Both
results (plays of the door) should be less than 0.5mm.
pulling lower portion of door toward the oven face. Both
results (plays of the door) should be less than 0.5mm.
2. The 1st latch switch and stop switch interrupt the circuit
before the door can be opened.
3. The monitor switch contacts of (COM.- NC.) close when
the door is opened and the monitored latch switch contacts
of (COM.- NO.) open and contacts of (COM.- NC.) close
when the door is opened.
of (COM.- NO.) open and contacts of (COM.- NC.) close
when the door is opened.
4. Re-install outer case and check for microwave leakage
around the door with an approved microwave survey
meter. (Refer to Microwave Measurement Procedure.)
meter. (Refer to Microwave Measurement Procedure.)
Figure C-6. Switch Adjustment
If the monitored switch, stop switch and monitor switch do not
operate properly due to a mis-adjustment, the following
adjustment should be made.
1. CARRY OUT 3D CHECKS
2. Loosen the two (2) screw holding the latch hook to the
operate properly due to a mis-adjustment, the following
adjustment should be made.
1. CARRY OUT 3D CHECKS
2. Loosen the two (2) screw holding the latch hook to the
oven cavity front flange.
3. With the door closed, adjust latch hook by moving it back
and forward or up and down. In and out play of the door
allowed by the latch hook should be less than 0.5 mm.
The horizontal position of the latch hook should be placed
where the latch head has pushed the plungers of the
monitor switch with the door closed. The vertical position
of the latch hook should be placed where the latch head
has pushed the plungers of the monitored latch switch
and stop switch with the door closed.
allowed by the latch hook should be less than 0.5 mm.
The horizontal position of the latch hook should be placed
where the latch head has pushed the plungers of the
monitor switch with the door closed. The vertical position
of the latch hook should be placed where the latch head
has pushed the plungers of the monitored latch switch
and stop switch with the door closed.
4. Secure the screws firmly.
5. Make sure all of the switches operate. If the latch head
5. Make sure all of the switches operate. If the latch head
has not pushed the plungers of the monitor switch with
door closed, adjust the latch hook position.
At that time, the latch head should have pushed the
plungers of the monitored latch switch and stop switch. If
the latch head has not pushed the plungers of the
monitored latch switch and stop switch with door closed,
loose two (2) screws holding latch hook to oven cavity
front flange and adjust the latch hook position.
door closed, adjust the latch hook position.
At that time, the latch head should have pushed the
plungers of the monitored latch switch and stop switch. If
the latch head has not pushed the plungers of the
monitored latch switch and stop switch with door closed,
loose two (2) screws holding latch hook to oven cavity
front flange and adjust the latch hook position.
After adjustment, make sure of the following:
1. In and out play of door remains less than 0.5 mm when
1. In and out play of door remains less than 0.5 mm when
latched position. First check latch hook position, pushing
and pulling upper portion of door toward the oven face.
and pulling upper portion of door toward the oven face.
COMPONENT REPLACEMENT AND ADJUSTMENT
1. CARRY OUT3DCHECKS.
2. Remove the two (2) screws holding the back plate to oven
2. Remove the two (2) screws holding the back plate to oven
cavity.
3. Disconnect the wire leads from the convection motor.
4. Remove the two (2) screws holding the convection fan
4. Remove the two (2) screws holding the convection fan
duct to the oven cavity from out-side.
5. Remove the four (4) screws holding the convection fan
duct to the oven cavity.
6. Now the convection fan duct is free.
7. Remove the one (1) nut holding the convection fan,
7. Remove the one (1) nut holding the convection fan,
washers, pipe and auxiliary fan to the convection fan
motor shaft.
motor shaft.
8. Remove the two (2) screws holding the convection motor
mounting plate to the convection fan duct.
9. Remove the pin on the convection fan motor shaft.
10. Remove the two (2) screws holding the convection motor
10. Remove the two (2) screws holding the convection motor
mounting plate to the convection fan motor.
11. Now, the convection fan motor is free.
1. CARRY OUT 3D CHECKS
2. Disconnect the wire leads to the grill heating element.
3. Remove the two(2) screws holding the exhaust duct
2. Disconnect the wire leads to the grill heating element.
3. Remove the two(2) screws holding the exhaust duct
assembly to the oven cavity.
4. Push the two tabs holding the grill heating element
assembly to the oven cavity.
5. Release the grill heating element assembly from the
oven cavity by sliding the cover.
6. Now the grill heating element assembly is free.
1. CARRY OUT 3D CHECKS.
2. Remove the control panel assembly referring to
2. Remove the control panel assembly referring to
"CONTROL PANEL REMOVAL".
3. Disconnect the leads from all switches.
4. Remove the two (2) screws holding the latch hook to the
4. Remove the two (2) screws holding the latch hook to the
oven cavity.
5. Remove the latch hook.
6. Push the retaining tab slightly and remove the switch.
6. Push the retaining tab slightly and remove the switch.
1. CARRY OUT 3D CHECKS.
2. Remove the fan duct from the oven cavity, referring to
2. Remove the fan duct from the oven cavity, referring to
"FAN MOTOR REPLACEMENT".
3. Disconnect the wire leads from the bottom heating
element.
4. Remove the two (2) nuts holding the bottom heating
element to the oven cavity right wall.
5. Remove the two (2) nuts holding the bottom heating
element to the heater cover with the heat sealed spring
at the oven cavity left wall.
at the oven cavity left wall.
6. Remove the bottom heating element from the oven
cavity.
Figure C-5. Switches
CONVECTION FAN MOTOR
CONTROL PANEL REMOVAL
MONITOR SWITCH (SW2)
STOP SWITCH (SW3)
MONITORED
LATCH SWITCH (SW1)
LATCH SWITCH (SW1)
TAB
TAB
TAB
LATCH
HEADS
HEADS
LATCH HOOK
MONITOR
SWITCH (SW2)
SWITCH (SW2)
MONITORED
LATCH
SWITCH (SW1)
LATCH
SWITCH (SW1)
STOP
SWITCH
(SW3)
SWITCH
(SW3)
DOOR OPEN BUTTON
OPEN LEVER
DOOR
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