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From the description a major part has failed, the magnetron is suspect because it suddenly shut down in cycle, if the unit is less than 7 years old it probably has a inverter board and tends to fail, also there is the possibility the keypad control board has stopped working. The microwave in my opinion is worth getting checked out and repaired, but it will be expensive.
Sounds like there is a stray piece of wire or other metal floating around inside the case. Remove the cover and any breakables in the microwave (the power cord is unplugged for this), turn it upside down over a table and shake it, pound the bottom, and shake it some more--likely the offending piece will drop out onto the table. If so, put it back together and whack it to see if that fixed the problem (cord plugged back in). This process can be repeated.
HERE THE STEPS TO DISASSEMBLEA gas range cabinet comes apart very easily. Here's how: Step 1: Take out the screws that hold the panels, and pull off the control knobs. On the control panel the knobs are friction-fit; pull them straight off. Some knobs may have setscrews in the base of the knobs; back out these screws using a screwdriver or Allen wrench and pull off the knobs.
Step 2: Remove the back service panel on the control panel by backing out a series of screws around the edge of the panel. To remove the front panel, take off the control knobs and remove a series of mounting screws that hold the decorative panel to the frame. These screws may be hidden by molding or trim; pry off the molding or trim with a screwdriver, or take out several screws.
Step 3: To gain access to the burner assemblies, remove the burner grates and then the top of the range. The entire range top should either lift up and off the range or open up and back on hinges. The oven door can usually be removed by pulling it straight up off the hinges on both sides of the door. Some hinges have a latch that must be unlocked before the door can be removed.
Step 4: If the surface light of the range burns out, remove retaining screws and panels as necessary to gain access to the bulb. Replace the burned-out bulb with a new one of the same type and wattage; check the ends of the old bulb for this information. Then replace any retaining panels.
Step 5: If the oven light burns out, unscrew it and remove it from the oven. Replace the burned-out bulb with a new one of the same wattage, made for oven use.
It is a door switch problem of some sort. I have two Sharp R-1611 units that do the same thing. The light and fan come on, but not the heat, thank goodness.
I am going to replace it since the plastic for the case and door is cracked in numerous places. I have spent several hours researching microwaves online have not a single clue what to replace the Sharp with. Seems like every vendor has very good units and very bad units. I guess you just pay your money and take your chances.