R-8000G
20
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
b. Disconnect wire leads from the heating element and measure the insulation resistance with 500V -
100M
Ω
insulation resistance meter. The insulation resistance between heating element terminal and
cavity should be more than 0.5M
Ω
.
6. If the meter does not indicate above resistance, replace the top heating element.
7. Reconnect all leads removed from components during testing.
8. Reinstall the outer case (cabinet).
9. Reconnect the power supply cord after the outer case is installed.
10. Run the oven and check all functions.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".
3. Open the door and block it open.
4. Discharge high voltage capacitor.
5. Disconnect input leads and check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the capacitor is normal, the meter will indicate continuity for a short time
and should indicate an open circuit once the capacitor is charged. If the above is not the case, check the
capacitor with an ohmmeter to see if it is shorted between the terminals. If it is shorted, replace the
capacitor.
6. Reconnect all leads removed from components during testing.
7. Reinstall the outer case (cabinet) and the back plate.
8. Reconnect the power supply cord after the outer case and the back plate are installed.
9. Run the oven and check all functions.
P
JET MOTOR CAPACITOR TEST
Q
JET MOTOR TEST
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
6. 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-5 and E-6.
Room Temperature
Resistance
68˚F(20˚C) - 86˚F(30˚C)
Approx. 360 k
Ω
- 152 K
Ω
7. If the meter does not indicate above resistance, replace the thermistor.
8. Reconnect all leads removed from components during testing.
9. Reinstall the outer case (cabinet).
10. Reconnect the power supply cord after the outer case is installed.
11. Run the oven and check all functions.
O
THERMISTOR TEST
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
5. Disconnect the 3-pin connector of the jet motor from the main wire harness.
6. Measure the resistance of the jet motor with an ohmmeter.
The resistance of the main coil, across the black and the red wires, should be approximately 100 ohms.
The resistance of the sub coil, across the black and the white wires, should be approximately 110 ohms.
7. Also, the jet motor has the thermal cut-out in it.
Measure the resistance of the main coil (or the sub coil). The resistance across the black and the red wires
(or across the black and the white wires) should be above resistance unless the temperature of the thermal
cut-out reaches approximately 266˚F (130˚C). The thermal cut-out resets automatically at 212˚F (100˚C).
If an ohmmeter indicates an open circuit under normal condition, replace the jet motor because the thermal
cut-out has opened. An open thermal cut-out indicates overheating of the jet motor. Check for restricted
air flow to the jet motor or a lock of the convection fan, especially the fan motor (power transformer side).
