Sharp R-62FBSTM Service Manual ▷ View online
R-61FBSTM/R-62FBSTM - 17
DESCRIPTION OF LSI
LSI(IXA216DRZZ)
The I/O signal
The I/O signal
of the LS
I(IXA216DRZZ) are detailed in the following table.
42
P71
OUT
Fan motor driving signal
To turn on and off the fan motor relay RY4.
"L" level during cooking, or for 2 minutes
after Grill cooking or Dual grill cooking. "H"
level otherwise.
To turn on and off the fan motor relay RY4.
"L" level during cooking, or for 2 minutes
after Grill cooking or Dual grill cooking. "H"
level otherwise.
43
P72
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay
(RY2). In 100% POWER op-
eration, 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 rep-
etition according to the power
level.
To turn on and off the cook relay
(RY2). In 100% POWER op-
eration, 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 rep-
etition according to the power
level.
44
AVDD
IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
45-48
ANI5-ANI2
IN
Terminal to change model and cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant. And DC voltage is dependent on the
Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant. And DC voltage is dependent on the
Model.
49
ANI1
IN
To input signal which communicates the door open/close information to LSI.
Door close “H” level signal (0V). Door open “L” level signal (-5V).
Door close “H” level signal (0V). Door open “L” level signal (-5V).
50
ANI0
IN
Connected to VSS.
51
AVSS
IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
The power source voltage to drive the A/D converter in the LSI.
52
P11
OUT
Terminal not used.
53
P10
OUT
Terminal not used.
54
P33
OUT
Grill heating element driving signal
To turn on and off the grill heating element
relay RY2. "L" level during Grill cooking or
Dual grill cooking. "H" level otherwise.
To turn on and off the grill heating element
relay RY2. "L" level during Grill cooking or
Dual grill cooking. "H" level otherwise.
55
INTP2
IN
Signal coming from encoder.
When encoder is turned, the contacts of encoder make pluse signals. And pulse signals
are input into INTP2.
When encoder is turned, the contacts of encoder make pluse signals. And pulse signals
are input into INTP2.
56
INTP1
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
This is the basic timing for time processing of LSI.
57
INTP0
IN
Signal comming from encorder.
Signal similar to INTP2. Pulse signals are input into INTP0.
Signal similar to INTP2. Pulse signals are input into INTP0.
58-59
P26-P25
OUT
Terminal not used.
60
P24
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P50 or P51 terminal while
the tact switch SW3 or SW4 is touched.
Signal applied to tact switch section. A pulse signal is input to P50 or P51 terminal while
the tact switch SW3 or SW4 is touched.
61
P23
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P51 terminal while the tact
switch SW2 is touched.
Signal applied to tact switch section. A pulse signal is input to P51 terminal while the tact
switch SW2 is touched.
62
P22
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P51 terminal while the tact
switch SW1 is touched.
Signal applied to tact switch section. A pulse signal is input to P51 terminal while the tact
switch SW1 is touched.
63
BZO90
OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
64
P20
OUT
Terminal not used.
Pin No.
Signal
I/O
Description
H : GND
L
During cooking, or for 2 minutes after
grill cooking or dual grill cooking
grill cooking or dual grill cooking
ON
OFF
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
cooking
(a. 32second time base)
MICRO
ON
OFF
COOK
100%
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.
MICRO
ON
OFF
COOK
100%
100%
48 sec.
0 sec.
70%
36 sec. 12 sec.
50%
26 sec. 22 sec.
30%
16 sec. 32 sec.
10%
8 sec. 40 sec.
ON/OFF time ratio in Micro
cooking
(a. 54second time base)
cooking
(a. 54second time base)
H : GND
L
During cooking
ON
OFF
(Grill or Dual grill)
20 msec.
H : GND
L : -5V
A
B
0.1 sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V
R-61FBSTM/R-62FBSTM - 18
SERVICING
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.
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 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.
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 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 is long enough that they
may be separated from each other. For those models, 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
activates an operational state that is equivalent to the
oven door being closed.
may be separated from each other. For those models, 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
activates an operational state that is equivalent to the
oven door being closed.
(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 activates 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.
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 activates 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.
3. Servicing Tools
Tools required to service the touch control panel assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a grounding
terminal.)
terminal.)
2) Oscilloscope: Single beam, frequency range: DC-10MHz
type or more advanced model.
3) Others: Hand tools
4. 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 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.
2. 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 line of
the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD.
Therefore, before checking the performance of the touch
control panel,
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD.
Therefore, before checking the performance of the touch
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,
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.
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.
approx. 1M ohm
R-61FBSTM/R-62FBSTM - 19
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:
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.
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.
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
R-61FBSTM/R-62FBSTM - 20
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
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, then pull the door open slowly. This
causes the latch heads to rise, it is then possible to hear
a "click" as the door switches operate.)
closed position, then pull the door open slowly. 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.
2. Door hinges or latch hook is damaged.
3. The door 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 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.
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS
2. Disconnect all the leads and terminal of high voltage
2. Disconnect all the leads and terminal of high voltage
rectifier from high voltage capacitor.
3. Remove one (1) screw holding earth side terminal of high
voltage rectifier, and remove capacitor holder from the
base plate.
base plate.
4. Remove the capacitor from the capacitor holder.
5. Now the high voltage rectifier and capacitor should be
5. Now the high voltage rectifier and capacitor should be
free.
Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal procedures:
To remove the outer case, proceed as follows.
1. Disconnect oven from power supply.
2. Open door and wedge open.
3. Remove the two screws from the rear intake duct.
4. Slide the rear intake duct up and pull it away from the oven
1. Disconnect oven from power supply.
2. Open door and wedge open.
3. Remove the two screws from the rear intake duct.
4. Slide the rear intake duct up and pull it away from the oven
cavity.
HIGH VOLTAGE COMPONENTS REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
5. Remove the screws from the rear(4), along the side
edges(4 hinge side, 3 control panel side) and from the
top(2 control panel side).
top(2 control panel side).
CAUTION: WHEN REPLACING HIGH VOLTAGE
RECTIFIER ASSEMBLY, ENSURE THAT THE
CATHODE (EARTH) CONNECTION IS
SECURELY FIXED TO THE CAPACITOR
HOLDER AND BASEPLATE WITH AN
EARTHING SCREW.
CATHODE (EARTH) CONNECTION IS
SECURELY FIXED TO THE CAPACITOR
HOLDER AND BASEPLATE WITH AN
EARTHING SCREW.
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
6. Slide the entire case back about 3cm to free it from the
retaining clips on the cavity face plate.
7. Lift the entire case from the oven.
8. Discharge the H.V capacitor before carrying out any
8. Discharge the H.V capacitor before carrying out any
further work.
9. Do not operate the oven with the outer case removed.
OUTER CASE REMOVAL
BUILD IN FRAME ASSEMBLY REMOVAL
To remove the build in frame assembly, proceed as follows.
1. Remove the four screws securing the frame assembly to
1. Remove the four screws securing the frame assembly to
the oven cavity, (two from the top and two from the hinge
side).
side).
2. Remove the two screws securing the frame assembly to
the control panel frame (accessed from the back of the
frame)..
frame)..
3. Open the oven door fully.
4. Push down the built in frame assembly at the bottom,
4. Push down the built in frame assembly at the bottom,
where it meets the cavity face.
5. Pull the built in frame assembly away from the cavity face
6. Now the built in frame assembly is free.
6. Now the built in frame assembly is free.
TOP SCREWS
C.P SECURING
SCREWS
SCREWS
HINGE SIDE
SCREWS
SCREWS
PRESS HERE
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN
COMPONENTS OR WIRING.
COMPONENTS OR WIRING.
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