Troubleshooting and Testing
3-8
Procedure
Letter
J
K
Component Test
CONVECTION CUT-OUT (on side of the heater duct)
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. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless
the temperature of thermal cut-out reaches 302°F (150°C). The thermal cut-out resets
automatically at approximately 266°F (130°C). If the thermal cut-out has operated under the
normal condition, replace the thermal cut-out. An open thermal cut-out indicates overheating
of heater unit, check for restricted air flow to the heater unit through the vent hole of the oven
cavity, especially the heater duct and convection fan.
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.
HEATING ELEMENT 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. Make sure the heating element is fully cooled and test as follows;
a. Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale,
the resistance between the heating element terminals should be approximately 10.2.
b. Disconnect wire leads and measure the insulation resistance with 500V - 100M insulation
resistance meter. The insulation resistance between heating element terminal and cavity
should be more than 0.5M.
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.
THERMISTOR 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. Disconnect connector-E from the control unit. Measure the resistance of the thermistor with an
ohmmeter. Connect the ohmmeter leads to Pin No’s E-3 and E-4.
If the meter does not indicate above resistance, replace the thermistor
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.
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