Sharp is a recognizable microwave brand, but the repair decision should remain conservative because the appliance category is often cheaper to replace than to service. Using about 10 years as a typical expected life, repairs under the threshold can make sense for early-life issues like a door interlock switch or turntable drive, especially if the unit is otherwise clean and the interior coating is intact.
If the magnetron or high-voltage circuitry is implicated, replacement is usually more practical because parts, labor, and safety handling can exceed the value of a new unit. If the microwave shows arcing, burn marks, or severe interior damage, replacement is recommended regardless of cost.
The replacement price point here reflects a mainstream countertop microwave listing from a major home-improvement retailer; built-in trim-kit setups can raise total cost.