Whirlpool MH2175XSB Service Guide - Page 6

Warning to In Home Service Professionals To avoid possible exposure to microwave radiation or energy, visually check the oven for damage to the door and door seal before operating any oven. Use a microwave survey meter to check the amount of leakage before servicing. In the event the R.F. Ieakage exceeds 4 mw/cm2 at 5 cm, appropriate repair must be made before continuing to service the unit. Check interlock function by operating the door latch. The oven cook cycle should cut off before the door can be opened. The door and latching assembly contains the radio frequency energy within the oven. The door is protected by three safety interlock switches. Do not attempt to defeat them. Under no circumstances should you try to operate the oven with the door open. • Proper operation of microwave ovens requires that the magnetron be properly assembled to the waveguide and cavity. Never operate the magnetron unless it is properly installed. • Be sure the "RF" seal is not damaged and is assembled around the magnetron dome properly when installing the magnetron. • Routine service safety procedures should be exercised at all times. • Untrained personnel should not attempt service without a thorough review of test procedures and safety information contained in this Job Aid. Whirlpool microwave ovens have a monitoring system designed to ensure proper operation of the safety interlock systems. The interlock monitor switch will immediately cause the oven fuse to blow if the door is opened and the primary door interlock switch and/or the secondary interlock switch contacts fail in a closed position. CAUTION: Replace a blown fuse with a 20 ampere class H fuse only. Test the upper and lower door interlock switches, cook relay and interlock monitor switch (middle switch) for proper operation as described in the component test procedures, before replacing the blown oven fuse. Do not attempt to repair sticking contacts of any interlock switch, safety switch, or Cook (Latch) relay. The components must be replaced. Any indication of sticking contacts during component tests requires replacement of that component to ensure reliability of the safety interlock system. NOTE: If the fuse is blown, the monitor, primary, and secondary interlock switches must be replaced. Be sure they are properly connected. 1-2