Troubleshooting and Testing
3-7
Procedure
Letter
H
I
Component Test
MONITOR SWITCH TEST
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. Before performing this test, make sure that the primary switch is operating properly, according
to
the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM)
terminal. Check the monitor switch operation by using the ohmmeter as follows. When the
door is open, the meter should indicate a closed circuit. When the monitor switch actuator is
pushed by a screwdriver through the lower latch hole on the front plate of the oven cavity with
the door opened (in this condition
the plunger of the monitor switch
is pushed in), the meter should
indicate an open circuit. If improper
operation is indicated, the switch
may be defective. After testing the
monitor switch, reconnect the wire
lead to the monitor switch (COM)
terminal and check the continuity of
the monitor circuit.
5. Reconnect all leads removed from components during testing.
TOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc.
Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with
only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided
into two units, Control Unit and Key Unit, and also the Control Unit is divided into two units, LSI
Unit and Power Unit, and troubleshooting by unit replacement is described according to the
symptoms indicated.
Before testing:
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 transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
6. After that procedure, re-connect the power supply cord.
1. Key Unit.
NOTE:
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. Check Key unit ribbon connection before replacement.
5. Reconnect all leads removed from components during testing.
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
continued
Monitor
Switch
Primary Interlock Switch
Screwdriver
Ohmmeter
RED
WHT/WHT
Third Door Switch
Summary of Contents for EI24MO45IBA
Page 2: ......
Page 18: ...Operation 2 6 Notes ...
Page 38: ...Component Teardown and Testing 4 10 Notes ...
Page 39: ...Wiring Diagrams 5 1 Wiring Diagram ...
Page 40: ...Wiring Diagrams 5 2 Oven Wiring Schematic Off Condition ...
Page 41: ...Parts List 6 1 Key Unit And Door Assembly ...
Page 42: ...Parts List 6 2 ...
