Page 25
MD24 and MD30
Troubleshooting Guide
5-2
#824820 - Revision A - December, 2013
TROUBLESHOOTING GUIDE
This section of the manual explains the Component Test Procedures.
NOTE:
Before continuing, please take note of the WARNINGS and CAUTIONS below.
• TO AVOID ELECTRIC SHOCK DURING TROUBLESHOOTING, NEVER TOUCH ANY PART OF THE ELECTRI-
CAL CIRCUIT WITH HANDS OR UN-INSULATED TOOLS WHILE THE POWER IS CONNECTED.
• MICROWAVE OVENS CONTAIN CIRCUITRY CAPABLE OF PRODUCING VERY HIGH VOLTAGE AND CUR-
RENT. CONTACT WITH THE FOLLOWING COMPONENTS MAY RESULT IN SERIOUS PERSONAL INJURY OR
DEATH:
• TRANSFORMER • RECTIFIER • HIGH VOLTAGE HARNESS
• MAGNETRON
• CAPACITOR
NOTE: THE CAPACITOR REMAINS CHARGED APPROXIMATELY 60 SECONDS AFTER THE OVEN IS
SWITCHED OFF. WAIT FOR 60 SECONDS, THEN SHORT THE CAPACITOR TO THE CHASSIS.
• BEFORE SERVICING THE MICROWAVE OVEN, THE CAPACITOR MUST BE DISCHARGED BY SHORTING
THE CONNECTING LEAD OF THE RECTIFIER AGAINST THE CHASSIS WITH AN INSULATED SCREWDRIV-
ER. FAILURE TO FOLLOW THIS STEP COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
• DO NOT OPERATE OR ALLOW THE OVEN TO BE OPERATED WITH THE DOOR OPEN.
Be careful when handling sheet metal parts - Edges may be sharp.
NOTE:
When troubleshooting, it may be necessary in some cases to supply power to the unit with outer cabinet
case removed (See CAUTION above).
In this event:
1.
Disconnect power supply cord, and then remove outer cabinet case.
2.
Open door and block it open.
3.
Discharge high voltage capacitor (See WARNING above).
4.
Disconnect leads to primary of the power transformer.
5.
Ensure that leads remain isolated from other components and oven chassis by using insulation tape.
6.
Only after performing five steps listed above should the power supply cord be reconnected.
When the testing is completed:
1.
Disconnect power supply cord, then remove outer case.
2.
Open the door and block it open.
3.
Discharge high voltage capacitor.
4.
Reconnect leads to the primary of the power transformer.
5.
Reinstall outer cabinet.
6.
Reconnect power supply cord after outer case is installed.
7.
Run oven and check all functions.
NOTES:
•
After performing any service to the Drawer Microwave, test to verify that there is no leakage of microwave ener-
gy (See page 4-3).
•
Make following safety checks on all ovens to be serviced before activating magnetron or other microwave
source, and make repairs as necessary:
•
Interlock operation
•
Proper drawer closing
•
Seal and sealing surfaces (arcing, wear, and other damage)
•
Evidence of dropping or abuse
•
Before turning on microwave power for any service test or inspection within microwave generating compart-
ments, check magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connec-
tions.
