Whirlpool MH2175XSB Service Guide - Page 5

General Important Safety Information Electrostatic discharge (esd) sensitive electronic Important safety Instructions Before touching any oven component or wiring, always unplug the oven from its power source and discharge the capacitor by using a 20,000 ohm discharge resistor or use an insulated plastic handle screwdriver to short across the capacitor terminals. Check that the unit is grounded before troubleshooting. Discharge any static charge from your body by touching ground before handling any part of the circuitry on the control board. Electrostatic discharge may damage the control circuit. Do not touch oven components or wiring during operation. Attach meter leads with alligator clips when making operational tests. For continued protection against radiation emission, replace only with these types of switches: Primary (Interlock) Switch: SZM-V16FA-63 or VP-533A-OF; Secondary (Interlock) Switch: SZM-V01-FA-32; Interlock (Monitor) Switch: SZM-VI6-FA-62 or VP-532A-OF; Oven Lamp Switch: SZM-V6-FA-31 or VP-331 AOD. ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress. • Use an antistatic wrist strap. Connect the wrist strap to a green ground connection point or unpainted metal in the appliance; or touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance. • Before removing the part from its package, touch the antistatic bag to a green ground connection point or unpainted metal in the appliance. • Avoid touching electronic parts or terminal contacts. Handle the electronic control assembly by the edges only. • When repackaging the failed electronic control assembly in an antistatic bag, observe the above instructions. It is neither necessary nor advisable to attempt measurement of high voltage. Attaching the adaptor ground terminal to the wall receptacle cover screw does not ground the appliance unless the cover screw is metal and not insulated and the wall receptacle is grounded through the house wiring. 1-1