MMD24S
MMD24B
TEST PROCEDURES
PROCEDURE | COMPONENT TEST |
|
LETTER |
| |
|
|
LBLOWN 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,TESTthe 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" part number
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.
MPOWER 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 filament 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 FILAMENT AND HIGH VOLTAGE.)
18