15
R-22GV
R-22GT
R-23GT
R-24GT
PROCEDURE
LETTER
COMPONENT TEST
TEST PROCEDURES (CONT'D)
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE VOLTAGE OF THE FILAMENT AND HIGH VOLTAGE COILS.)
C
HIGH VOLTAGE RECTIFIER (1) AND/OR (2) TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across
the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a
short is indicated in both directions, or if an infinite resistance is read in both directions, the rectifier is
probably defective and should be replaced.
NOTE: Be sure to use an ohm-meter that will supply a forward bias voltage of more than 6.3 volts.
D
HIGH VOLTAGE CAPACITOR (1) AND/OR (2) TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and
check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage 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 either of the terminals and
case. If it is shorted, replace the capacitor.
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicated an open circuit with the door open and a closed circuit with the
door closed. If improper operation is indicated, replace the secondary interlock switch.
F
PRIMARY INTERLOCK SYSTEM TEST
DOOR SENSING SWITCH
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicated an open circuit with the door open and a closed circuit with the
door closed. If improper operation is indicated, replace the door sensing switch.
NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the blower
motor, stirrer motors and oven light will be activated by RY1 for one minute.
PRIMARY INTERLOCK RELAY (1), (2)
Disconnect two (2) wire leads from the male tab terminal of the Primary Interlock Relay (1) and (2).
Primary Interlock Relay (1)
RY-2
Primary Interlock Relay (2)
RY-3
Check the state of the relay contacts via tab terminal using a ohmmeter. The relay contacts should be
open. If the relay contacts are closed, replace the circuit board entirely or the relay itself.
E
SECONDARY INTERLOCK SWITCH TEST
G
MONITOR SWITCHES (1), (2) TEST
Disconnect the oven from power supply. Before performing this test, make sure that the secondary
interlock switches (1), (2) and the primary interlock relays (1), (2) are operating properly, according to
the above Switch Test Procedure.
Disconnect the wire lead from terminal (COM.) of the monitor switch(es) (1) and/or (2). Check the monitor
switch(es) (1) and/or (2) operation using the an ohmmeter. Connect ohmmeter leads between monitor
switch (COM.) terminal and (N.C.) terminal. When the door is open, the meter should indicate a closed
circuit. When the monitor switch actuator is pushed by a screw driver through the upper latch hole on
the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch
is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may
be defective. After testing the monitor switch, re-connect the wire lead to the monitor switch (COM.)
terminal and check the continuity of the monitor circuit.
