23
Service Manual for
RCO Speed Oven
High Voltage Diode
(HV016 HV015)
Chassis GND wire to
Xfmr mounting plate at
earth / safety / chassis GND
Chassis GND
via waveguide
weldment
Chassis GND Xfmr winding
to the Xfmr stack to the
Xfmr mounting plate to
earth / safety / chassis GND
0.85F
2500V
Magnetron
F
FA
6B
6A
2K
C1
+
6V
SECONDARY
2.4 kV
SECONDARY
Magnetron Circuit Schematic
Magnetron Replacement
1. Remove the unit from its power source and follow
the proper Lockout/Tagout procedures.
2. Remove the top, side and rear service covers
and panels.
3. Discharge the HV Capacitors. Refer to the
Discharging the High Voltage System section of the
manual for proper instructions for this procedure.
4. Remove the Magnetron Blower Assembly from the
unit. Refer to the Magnetron Cooling Fan Motor
Replacement section of this manual for instructions.
Magnetron Blower Assembly Removed
SHOCK HAZARD: The High Voltage
Capacitor retains a 2.5kV DC charge after the oven
has been disconnected from its power source.
The capacitor must be properly discharged prior
to beginning work on any components in the
high voltage area. Failure to comply can cause
property damage, injury or death.
5. Do not attempt the next step if the HV Capacitor
has not been discharged.
6. Tag and disconnect both Magnetrons and
Magnetron Thermal Switches wiring.
7. Remove the Magnetron mounting nuts and the
defective Magnetron. Make note of the Magnetron
orientation before removing it.
8. Install the replacement Magnetron ensuring its
orientation matches the one just removed.
9. Referring to the tags, reconnect the Magnetron
wires and the Magnetron Thermal Switch wires.
10. Reinstall the Magnetron Blower Assembly.
11. Referring to the tags, reconnect the fan motor
wires.
12. Reattached all covers and panels.
13. Restore power to the unit.
14. Perform a Magnetron Test. Refer to the Magnetron
Testing section of this manual for instructions.
Before performing any tests
of the unit’s operating abilities make sure a
load is placed in the oven cavity.
15. Perform a Microwave Leakage test (as described
on page 32) to validate proper functionality.
CAUTION:
When installing the new magnetron, be
sure the metal mesh gasket is properly
positioned around the magnetron dipole
antenna.
HIGH VOLTAGE (HV) TRANSFORMERS
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 High Voltage Capacitor
retains a 2.5kV DC charge after the oven
has been disconnected from its power source.
The capacitor must be properly discharged
prior to beginning work on any components
in the high voltage area. Failure to comply
can cause property damage, injury or death.
The High Voltage (HV) Transformers are located at the
