Sharp R-32STM Service Manual ▷ View online
R32STM - 13
Pin No.
Signal
I/O
Description
56
P10
OUT
Terminal not used.
57-60
SEG33-SEG30
OUT
Terminal not used.
61-90
SEG29-SEG0
OUT
Segment data signal.
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 (90) ............................... 1
SEG 0 (90) ............................... 1
SEG15 (75) ............................ 29
SEG 1 (89) ............................... 2
SEG16 (74) ............................ 28
SEG 2 (88) ............................... 3
SEG17 (73) ............................ 27
SEG 3 (87) ............................... 4
SEG18 (72) ............................ 26
SEG 4 (86) ............................... 5
SEG19 (71) ............................ 25
SEG 5 (85) ............................... 6
SEG20 (70) ............................ 24
SEG 6 (84) ............................... 7
SEG21 (69) ............................ 11
SEG 7 (83) ............................... 8
SEG22 (68) ............................ 23
SEG 8 (82) ............................... 9
SEG23 (67) ............................ 22
SEG 9 (81) ............................. 10
SEG24 (66) ............................ 12
SEG10 (80) ............................. 34
SEG25 (65) ............................ 13
SEG11 (79) ............................. 33
SEG26 (64) ............................ 14
SEG12 (78) ............................. 32
SEG27 (63) ............................ 15
SEG13 (77) ............................. 31
SEG28 (62) ............................ 16
SEG14 (76) ............................. 30
SEG29 (61) ............................ 17
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. 21).
95
COM2
OUT
Common data signal: COM2.
Connected to LCD (Pin No. 20).
96
COM1
OUT
Common data signal: COM1.
Connected to LCD (Pin No. 19).
97
COM0
OUT
Common data signal: COM0.
Connected to LCD (Pin No. 18).
98-99
VL3-VL2
IN
Power source voltage input terminal.
Standard voltage for LCD.
100
C2
IN
Terminal not used.
DESCRIPTION OF LSI
LSI(IZA988DR)
The I/O signal of the LSI(IZA988DR) are detailed in the following table.
R32STM - 14
SERVICING
controls (sensor-related ones included) of the touch
control panel while keeping it connected to the oven.
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 so 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 the dummy resistor(s)
with resistance equal to that of the controls are used.
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 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 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).
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 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
DTA123ES
KRA101M
KRC243M
DTA123ES
KRA101M
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
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 in aluminium foil. Also wrap PW boards
containing them in aluminium foil.
containing them in aluminium foil.
2) When soldering, ground the technician as shown
in the figure and use grounded soldering iron
and work table.
and 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 itself or from an external power source.
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.
(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
transformer, 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 insulating tape. After servicing,
be sure to replace the leads to their original
locations.
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 transformer 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.
itself is so short that the two can't be separated.
For those models, check and repair all the
R32STM - 15
1. CARRY OUT 3D CHECKS.
2. Make sure that a definite "click" can be heard when the
2. Make sure that a definite "click" can be heard when the
microwave oven door is unlatched. (Hold the door in a
closed position with one hand, then push the door open
button with the other, this causes the latch heads to rise,
it is then possible to hear a "click" as the door switches
operate.)
closed position with one hand, then push the door open
button with the other, this causes the latch heads to rise,
it is then possible to hear a "click" as the door switches
operate.)
3. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
COMPONENT REPLACEMENT AND ADJUSTMENT
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal
procedures:
procedures:
MONITORED LATCH SWITCH, MONITORED SWITCH AND STOP SWITCH REMOVAL
MONITOR SWITCH (SW2)
STOP SWITCH (SW3)
MONITORED
LATCH SWITCH (SW1)
LATCH SWITCH (SW1)
TAB
TAB
TAB
1. CARRY OUT 3D CHECKS.
2. Remove the control panel assembly referring to
2. Remove the control panel assembly referring to
"CONTROL PANEL ASSEMBLY REMOVAL".
3. Disconnect the all leads from the 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.
Figure C-3. Switches
R32STM - 16
COMPONENT REPLACEMENT AND ADJUSTMENT
REMOVAL
1. Disconnect the power supply cord.
2. Open the door slightly.
3. Remove the choke cover taking care not to break clips
2. Open the door slightly.
3. Remove the choke cover taking care not to break clips
by inserting an iron plate (thickness of about 0.5mm)
or flat type screw driver to the gap between the choke
cover and door panel as shown Figure C-4 to free the
engaged parts.
or flat type screw driver to the gap between the choke
cover and door panel as shown Figure C-4 to free the
engaged parts.
4. Release choke cover from door panel.
5. Now choke cover is free.
5. Now choke cover is free.
Figure C-4. Door Disassembly
6. Release two (2) pins of door panel from two (2) holes
of upper and lower oven hinges by lifting up.
7.
1. Remove door assy by removing screws (4).
8. Release door panel from tabs of door frame and
remove door frame by sliding the door panel downward.
9. Now, door panel with inner sealer film is free.
10. Tear inner sealer film from door panel.
11. Now, door panel is free.
12. Slide latch head upward and remove it from door
10. Tear inner sealer film from door panel.
11. Now, door panel is free.
12. Slide latch head upward and remove it from door
frame with releasing latch spring from door frame and
latch head.
latch head.
13. Now, latch head and latch spring are free.
14.
14.
Remove Glass Stopper Screw (noting position of
stopper) and slide stopper down while lifting up.
stopper) and slide stopper down while lifting up.
15.
Slide glass towards Glass Stopper position and
then down towards the lower edge of the door
frame.
frame.
16.
Lift upper edge of glass, which will now be free
from upper clips and remove from lower clips.
17.
Refitting is a reversal of the above when refitting,
ensure the glass and the glass stopper is in the
original position.
original position.
RE-INSTALL
1. Re-install the outer door glass to the door frame with
the glass stopper.
2. Hold the glass stopper with the one (1) screw.
3. Re-install latch spring to the head. Re-install latch
3. Re-install latch spring to the head. Re-install latch
spring to the door frame. Re-install latch head to the
door frame.
door frame.
4. Re-install door panel to door frame by fitting tabs of
door frame to holes of door panel.
5. Put sealer film on door panel. Refer to “Inner Sealer
Film” and figure C-6, on how to handle the new film.
6. Catch two (2) pins of door panel on two (2) hole of
upper and lower oven hinges.
7. Re-install choke cover to door panel by pushing.
Note: After any service to the door;
(A) Make sure that monitored latch switch, stop
(A) Make sure that monitored latch switch, stop
switch and monitor switch are operating properly.
(Refer to chapter “Test Procedures”.).
(Refer to chapter “Test Procedures”.).
(B) An approved microwave survey meter should be
used to assure compliance with proper
microwave radiation emission limitation
standards.
microwave radiation emission limitation
standards.
10
5
4
12
8
7
9
11
3
2
1
Choke Cover
Door Frame
Putty Knife
6
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center of
latch hole.
latch hole.
2. Deviation of door alignment from horizontal line of
cavity face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Check for microwave leakage around door with an
approved microwave survey meter. (Refer to
Microwave Measurement Procedure.)
Microwave Measurement Procedure.)
Note:
The door on a microwave oven is designed to act
as an electronic seal preventing the leakage of
microwave energy from oven cavity during cook
cycle. This function does not require that door be
air-tight, moisture (condensation)-tight or light-
tight. Therefore, occasional appearance of
moisture, light or sensing of gentle warm air
movement around oven door is not abnormal
and do not of themselves, indicate a leakage of
microwave energy from oven cavity.
as an electronic seal preventing the leakage of
microwave energy from oven cavity during cook
cycle. This function does not require that door be
air-tight, moisture (condensation)-tight or light-
tight. Therefore, occasional appearance of
moisture, light or sensing of gentle warm air
movement around oven door is not abnormal
and do not of themselves, indicate a leakage of
microwave energy from oven cavity.
Figure C-5. Door Replacement
INNER
SEALER FILM
Installation
1. Tear away the backing film.
3. Put the pasted side of the inner sealer film on the door
3. Put the pasted side of the inner sealer film on the door
panel.
Pin
Pin
Lower
Oven
Hinge
Oven
Hinge
Lower Oven
Hinge
Hinge
Upper
Oven
Hinge
Oven
Hinge
Upper Oven
Hinge
Hinge
Door Panel
Choke Cover
Door film
Finger tab
Backing film
Figure C-6. Inner Sealer Film
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