How do you change the bulb inside in a GMC275, GMC305 Microwave?

Changing the light bulb on your Sharp carousel microwave will allow you to have needed light inside the oven. Microwaves are not designed for consumers to change the light bulb due to manufacturer liability, but it can be done. Following the proper steps will ensure a successful installation. Step 1 Unplug the Sharp carousel microwave from the electrical outlet.
Step 2 Locate the screws around the outer cover of the Sharp carousel microwave and unscrew all the screws.
Step 3 Lift off the covering.
Step 4 Locate the bulb and unscrew. Screw in your new bulb.
Step 5 Replace the cover and screw back tightly. Once done, test your new bulb.

What kind of microwave oven is this? A counter-top model or an over-the-range microwave? Do you have a brand and model number? And which light bulb do you want to replace - the cavity light bulb, or the bottom light(s) of an OTR microwave?

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You need to share more infromation as to when and what you're doing when the fuse blows.

You must be observant and determine when the fuse is blowing. Clues are needed to solve problems.

You can download GE owner's manuals and installation instructions
here.

The manual will cover bulb replacement.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

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You can download owner's manuals and installation instructions for several brands (including Amana, Jenn-Air, Kitchenaid, Litton, Maytag, Roper, Tappan, Thermador and Whirlpool) here.
You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Normal procedure is to remove case cover to access the bulb.

Usually several screws on the back and some partially hidden on the front to remove. Sometimes the screws require a Torx screwdriver.

Unplug unit and avoid touching any wires.

Replace bulb with exact type.

take the screws out of the cover take it off can now access the light-check appliance store or hardware for the bulb.

normally there is a side door that can be removed to replace the inside light bulb, the microwave bublb is changed from a different location normally on the back.

Normally a microwave has to be opened to do this , very high voltage inside approx 2400v , but a normal screw in microwave bulb.