Originally Posted by Gene
If you feel comfortable to work under power then unplug the microwave and open the control panel. Remove the wires from the HV transformer primary winding and attache voltmeter probes to these wires. Plug the microwave back. Start the microwave as usual (the door is closed) and measure the voltage. Post the result.
Here are the breakdown diagrams and Parts for Whirlpool MH1170XSB3 Microwave - AppliancePartsPros.com
P.S. How the microwave is installed into the cabinet is described in the Installation instructions
Gene thanks for your help, so i took the M/W apart and got to the HV transformer. So just unhook which exact wires? see picture attached. There are 3 wires coming from the trans...