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Power Supply Cord Replacement
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 the white and black wires of the power
supply cord from the noise filter.
4. Remove the one (1) screw holding the earth wire of
the power supply cord to the base cabinet.
5. Remove the power supply cord from the rear cabinet.
Re-install
1. Insert the power supply cord into the rear cabinet.
2. Connect the white and black wires of the power
supply cord into the terminal of noise filter, referring
to the Pictorial Diagram.
3. Re-install the earth wire of the power supply cord to
the base cabinet with the one (1) screw.
Figure 4-5. Power Supply Cord Replacement
Component Teardown
Servicing The Touch Control Panel
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 in aluminium foil. Also wrap all PW boards in
aluminium foil.
2. When soldering, ground the technician and use a
grounded soldering iron and work table.
Servicing of Touch Control Panel
The following are 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.
A. Servicing the touch control panel with power
supply of the oven:
Therefore, before checking the performance of the touch
control panel:
1. Disconnect the power supply cord and then remove
the outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect leads to the primary of power transformer.
5. Ensure leads remain isolated from other components
and oven chassis by using insulation tape.
6. Re-connect the power supply cord.
After checking performance of the touch control panel:
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. Reconnect leads to the primary of power transformer.
4. Reinstall the outer case (cabinet).
5. Reconnect 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. For those
models, check and repair all the controls (sensor
related ones included) of the touch control panel
4-7
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