Service Manual for
RCO Speed Oven
16
OVEN FRONT
Monitor
Switch
Primary
Interlock
Switch
Location of the Monitor and Primary
Interlock Switches
The Secondary Interlock switch is located on the upper
left side of the unit.
OVEN FRONT
Secondary
Interlock
Switch
Location of the Secondary Interlock Switch
Operational Testing
The Primary Interlock and Secondary Interlock switches
are normally closed when the door is closed. The Monitor
Switch is normally open when the door is closed.
Switch Replacement
1. Remove the unit from its power source and follow
the proper Lockout/Tagout procedures.
2. Remove the top and both side panels.
3. Test for proper switch operation.
4. Tag and disconnect the faulty switch’s wires.
5. Remove the faulty switch.
6. Install the replacement switch.
7. Restore power to the unit, and test for proper switch
operation.
8. Remove power from the unit and reattach all covers
and panels.
9. Restore power to the unit.
10. Perform a Microwave Leakage Test (as described
on page 32) to validate proper functionality.
THERMAL CUTOUTS
Before performing any service that
involves electrical connection or disconnection
and/or exposure to electrical components, always
follow the Electrical LOCKOUT/TAGOUT Procedure.
Disconnect all circuits. Failure to comply can
cause property damage, injury or death.
The Thermal Cutout Switch (Hi Limit) and Auxiliary
Cutout Switch are located on the rear of the unit just
above the power cord strain relief.
Auxiliary
Thermal
Cutout
Switch
Thermal
Cutout
Switch
Location of Thermal Cutout Switches
Operational Testing
The main Thermal Cutout Switch remains closed until
the oven reaches 572°F (300°C) The Auxiliary Switch
opens when the oven cavity reaches 525°F (274°C). The
main Thermal Cutout Switch must be manually reset.
The temperature must drop below 500°F (260°C) before
a reset can be attempted. Test the Thermal Cutouts for
continuity in ambient temperature. The Thermal Cutout
must be reset before attempting the test. If the test fails
the unit is faulty.