I have a KCMS2055 SSS-1 microwave unit which is notorious for having door switches go bad. The unit has power but will not turn the turntable/run after entering a use time,closing the door and hitting the start button.However,I can ever so slightly push in on the door opener and the unit will engage. Service companies have changed door switches on four different calls and when I ask them why the same issue recurs they say the switches are just a cheap and unreliable part.This unit is in a home I rent and I would like to consider replacing the switch(es) myself.I am no professional repair person but have watched how the unit is removed from the cabinet and how the casing is removed. Does it require a special tool to remove the screws holding the switches in place or can I use a standard phillips head screwdriver? Also,does the unit store voltage after being unplugged that I need to dissipate before removing the switches? I do not recall seeing any service technician cross grounding anything for this purpose when they have replaced switches on this unit. Any input is appreciated and thanks.
Re: Unable To Remove Oven Door Per Manual
« Reply #4 on: December 26, 2018, 10:57:43 PM »
They're using crappy switches. I use QBP switches with no problems. Use 28QBP0495 if you have 3/16" terminals and 28QBP0496 if you have 1/4" terminals. The HV capacitor can potentially hold a lethal charge but it has a bleeder resistor to drain the charge while not in use. I discharge the capacitor by shorting the terminals with a copper wire loop held with insulated pliers.
« Last Edit: December 26, 2018, 10:58:49 PM by tgoods »
As suggested by tgoods and a switch bag left by the last repair tech I ordered ERP switches and they have arrived. The switch configuration on my unit uses the Common (with black and pink wires) and Normally Open(with green,yellow and white and tan wires) switch terminals. If I understand Electricity 101 correctly, a Normally Open switch tests good when the switch is activated.In my case this will be when the door is closed and the latch assembly has all three switch buttons depressed/closed. If this is correct can I test each switch by attaching gator clips connected to my multimeter to the Common and Normally Open switch terminals without removing any of the wiring terminal clips coming from the microwave? Pictures are attached showing the bottom and middle switches in one and the top switch in another. I will have to remove the terminal clip from the top switch because it is a single piece unit that completely covers the switch terminals.