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Component Teardown
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, 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
activates 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.
B. 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).
Servicing Tools
Tools required to service touch control panel assembly.
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
Other Precautions
1. Before turning on power source of the control unit,
remove the aluminium foil applied for preventing
static 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.
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.
Control Panel Assembly And Control
Unit Removal
1. Disconnect the oven power supply cord and remove
outer case.
2. Discharge high voltage capacitor.
To discharge the high voltage capacitor, wait for 60
seconds and then short-circuit the connection of
the high-voltage capacitor (that is the connecting
lead of the high-voltage rectifier) against the
chassis with the use of an insulated screwdriver.
3. Disconnect connector CN-A, CN-E and CN-F from
the control unit.
4. Disconnect the wire leads from the relays RY1, RY2
and RY3.
5. Remove one (1) screw holding the control panel back
plate to the chassis support.
6. Remove two (2) screws holding the bottom edge of
the back plate to the cabinet base.
7. Remove one (1) screw holding the back plate to the
oven cavity flange.
8. Lift up and pull the control panel assembly forward.
Replacement of individual component is as follows:
CONTROL UNIT AND KEY UNIT
1. Disconnect the wire connector from the control unit.
2. Remove the four (4) screws holding the panel frame
to the back plate.
3. Separate the panel frame and back plate.
4. Remove the three (3) screws holding the control unit
to the panel frame.
5. Lift up the control unit and disconnect the key
connector from the control unit.
6. Now, the control unit and frame assembly are
separated.
1. Before attaching a new key unit, wipe off
remaining adhesive on the control panel frame
surfaces completely with a soft cloth soaked in
alcohol.
2. When a attaching the key unit to the control
panel frame, adjust the lower edge and right
edge of the key unit to the correct position of the
control panel frame.
3. Stick the key unit firmly to the control panel.
4-8
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