11
R-22GV
R-22GT
R-23GT
R-24GT
OVEN LAMPS
The oven cavity light illuminates the interior of the oven so
that food being cooked can be examined visually through
the door window without having to open the door. The oven
lamp is on during the cooking cycle and idle condition.
SELECT SWITCHES (1) - (4) (for R-23GT and R-
24GT)
The select switch assembly is an array of four separate
switches which may be configured for either 208V or 230V
operation (see General Information section, voltage select).
These switches are connected to the windings of compo-
nents specified in the table below and make those compo-
nents compatible with the specified line voltage by changing
their internal windings. For 208V operation contacts (Nor-
mal Open) of the all switches are open.
SELECT SWITCH (1)
COM.
SELECT
SWITCH (2)
N.C.
N.O
SELECT SWITCH ANGLE
SELECT SWITCH (3)
SCREW
SELECT SWITCH (4)
Oven
cavity
Rear
cabinet
side
SELECT SWITCH AND ELECTRICAL COMPONENTS
CONDITION
SWITCH NO.
ELECTRICAL PARTS
(1)
Touch control unit
(2)
Blower motor
(3)
Power transformer (1) (Front side)
(4)
Power transformer (2) (Rear side)
Oven in the 208V setting: contacts between common and
normally open are closed.
Oven in the 230V setting: contacts between common and
normally closed are closed.
INTAKE THERMISTOR
This thermistor detects ambient air temperature. The ther-
mistor is a negative temperature coefficient type. The tem-
perature around the lower position of control panel is de-
tected through the resistance of the thermistor.
If the thermistor remains in a shorted condition for more than
2 minutes, the control will display “EE10” and stop operat-
ing.
MAGNETRON THERMISTOR
The thermistor is a negative temperature coefficient type.
The air temperature around the lower magnetron is de-
tected through the resistance of the thermistor.
If the temperature is high, the control panel will display
"EE17" and the oven will stop to protect the lower magnetron
against overheat.
If the thermistor is open, the control panel will display "EE16"
and the oven will stop.
BLOWER MOTOR THERMAL CUT-OUT 115˚C
This thermal cut-out protects the blower motor against
overheating. If its temperature goes above 239˚F (115˚C)
because the blower motor is stalled or the ventilation open-
ings are blocked, the contacts of the thermal cut-out will
open. The line voltage to the control unit will be cut off and
the operation of the oven will be stopped. The defective
thermal cut-out must be replaced with a new one.
BLOWER MOTOR
The blower motor drives a blade which draws external cool
air into the oven. This cool air is directed through the air
vanes surrounding the magnetrons and cools the
magnetrons. This air is channelled through the oven cavity
to remove steam and vapours given off from the heating
foods. It is then exhausted through the exhausting air vents
at the oven cavity.
STIRRER MOTOR
The upper and lower stirrer motors drive stirrer antennas to
stir the microwave radiation from the upper and lower
waveguides.
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the
possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found
in the "Test Procedure"section.
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switches (1), (2),
primary interlock relays (1), (2), door sensing switch and secondary interlock switches (1), (2) before
replacing the monitor fuse. If monitor fuse is replaced, the mintor switches (1) and/or (2) must also be
replaced. Use part FFS-MA012WRK0 (R-22GV/22GT)/ FFS-MA015WRK0 (R-23GV/24GT) as an assem-
bly.
