Table of Contents
Advertisement
PROCEDURE
LETTER
3.
To discharge high voltage capacitor, wait for 60 seconds.
4.
Before performing this test, make sure that the secondary interlock switch, according to the above
Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check
the monitor switch operation by using the ohmmeter as follows. When the drawer is open, the
meter should indicate a closed circuit. When the monitor switch actuator is pushed by a screw
driver through the lower latch hole on the front plate of the oven cavity with the drawer 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 and both the monitor
switch, plus fuse will need to be replaced. After testing the monitor switch, reconnect the wire lead
to the monitor switch (COM) terminal and check the continuity of the monitor circuit.
5.
Reconnect all leads removed from components during testing.
6.
Reassemble the unit.
7.
Reconnect the power supply cord.
8.
Run the oven and check all functions.
L
BLOWN MONITOR FUSE TEST
1.
Disconnect the power supply cord.
2.
Open the drawer and block it open.
3.
To discharge high voltage capacitor, wait for 60 seconds.
4.
If the monitor fuse is blown when the drawer is opened, check the primary interlock switch,
secondary interlock switch and monitor switch according to the "TEST PROCEDURE" for those
switches before replacing the blown monitor fuse.
CAUTION:
BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE SECONDARY INTERLOCK
SWITCH, STOP SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.
If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must
be replaced with "monitor fuse and monitor switch assembly" See Section 5, even if the monitor switch
operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse
and switch.
5.
Reconnect all leads removed from components during testing.
6.
Reassemble the unit.
7.
Reconnect the power supply cord.
8.
Run the oven and check all functions.
M
POWER TRANSFORMER TEST
1.
Disconnect the power supply cord.
2.
Open the drawer and block it open.
3.
Discharge high voltage capacitor.
4.
Disconnect the primary input terminals and measure the resistance of the transformer with an
ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance
of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be
approximately 90 ohms; the resistance of the ¿ lament coil should be less than 1 ohm.
5.
Reconnect all leads removed from components during testing.
6.
Reassemble the unit.
7.
Reconnect the power supply cord.
8.
Run the oven and check all functions.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE
Drawer Microwave
TEST PROCEDURES
Ohmmeter
FILAMENT AND HIGH VOLTAGE.)
COMPONENT TEST
MONITOR
SWITCH
(BLK)
(RED)
(BRN,GRY)
(BRN,BLK)
SECONDARY
INTERLOCK
SWITCH
6-11
Troubleshooting
Screw Driver
Advertisement
Table of Contents
