6 – 10
2. Check in the event of a fuse 20A blowing
When the fuse F10A was blown, observe the following instruction:
There are many high voltage components in the oven, therefore, except for performing operational check, unplug the power cable before starting
work. For the harness, check for poor caulking, poor connection, etc.
3. Check in the event of no microwave cooking
Check of high voltage sections is very dangerous. Therefore, after the inverter boards (M and AC3) and 110V at the primary terminal are confirmed to
be satisfactory, disconnect the main power and wait for at least one (1) minute before starting the check.
Check of individual components is done with the high voltage circuit wiring disconnected.
*1 Disconnect only the inverter unit terminals M and AC3. Then measure voltage between CN-A pins #1 and #3 (between PD 100 2P and 1P) with an
analog tester while performing heating operation.
*2 If a value measured by a digital tester is unstable, connect a resistor of 10 kΩ to 100 kΩ between the pins #1 and #3 to measure the value.
NO
YES
YES
NO
Replace the inverter unit.
(Function is normal.)
Check is finished.
(The fuse has blown.)
Replace the secondary interlock switch.
Replace the monitor switch and fuse 20A.
Poor insulation of the low voltage parts,
Is there continuity between the COM and NO terminals of the secondary interlock switch when the
door is opened?
Is there continuity between the monitor switch terminals when the door is closed?
Disconnect the 110 volt supply (terminals AC3 and M) to the inverter unit. Operate the oven
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
YES
NO
YES YES
YES
NO
NO
NO
Check
(Inverter unit M, AC3, CN-A and F&FA, and magnetron F and FA)
(Function is normal.)
(Function is normal.)
(Function is not normal.)
(Function is not normal.)
Is there a voltage of 110V between the primary
terminal ends of the inverter unit?
Replace the control unit.
Is there a voltage of about 0.4 - 0.5V DC between the
inverter CN-A pins #1(negative) and #3 (positive)?
*
1,
*
2
Adjust the latch base angle.
Check the secondary interlock switch.
In this case, check the high-voltage
diodes (D120 and D121) of the
inverter unit for a short circuit.
Replace the magnetron.
Check is finished.
Is the secondary interlock switch ON?
Is there a continuity between the antenna switch
terminals?
Is there a history of the antenna motor rotation
error in the test mode 02?
Antenna motor rotates.
Replace the antenna motor. Replace the antenna switch.
Is the fan motor running?
Is there a voltage of about 110V between the fan
motor terminal ends?
Replace the fan motor.
Is wiring on the high voltage side correct?
Have the terminals been completely inserted?
Correct the wiring.
Completely insert the harnesses.
Is there continuity between the magnetron terminals?
Is there a short circuit between the magnetron heater
terminal and any metal part of the magnetron body?
Are the magnetron cooling fins easily deformed?
Has the magnet cracked?
Replace the inverter unit.
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