Troubleshooting and Testing
3-6
Procedure
Letter
F
G
Component Test
PRIMARY INTERLOCK RELAY (RY2)
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
(See Warnings and Instructions on page 3-1)
4. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay
(RY2). Check the state of the relay contacts using a ohmmeter. The relay contacts should
be open. If the relay contacts are closed, replace the circuit board entirely or the relay itself.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
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. (See Warnings and Instructions on page 3-1)
4. Before performing this test, make sure that the secondary interlock switch and the primary
interlock relay are 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 screw driver 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.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
Monitor Switch
Secondary
Interlock Switch
Screwdriver
Latch Hook Left
BLK
GRY
Ohmmeter
To Next Page
Loading...
