I need a manual for Sears Kenmore 158.17300 sewing machine even if I get a sheet of instructions.. mailed to me .

It may be a blown fuse or a bad thermostat / TCO on the oven cavity or above or on the microwave.
Yours should have a "mini-manual" (technical sheet) hidden either behind the grille or control panel. It is very helpful in locating and testing components.
There is a video here showing how to remove a typical over the range control panel assembly in under 5 minutes.
Accessing some components (especially the oven cavity thermostat) for testing and possible replacement will require you to remove the oven from the wall and take off the outer cover.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.
You can download Kenmore manuals and installation instructions at http://www.managemylife.com by clicking the Manuals link near the top center of the page. Then enter your full model number from the tag on the oven on the next page.
A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

You can order parts and find helpful exploded views at the Sears Parts Direct Web site .

I am assuming the case from the microwave has been removed.
Ensure the capacitor is discharged!
Remove the connections from the rear of the magnetron and remember which way around they go, a photo on a phone camera is very usefull!
Undo the fixing screws and remove the magnetron from the cavity. Replacement is the reverse procedure.
Hope that helps.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########.

You can just enter your full model number at the Sears parts site.

On the resulting page, look to the right for the blue "View manuals" button. Click there.



That Sears-related site has many free manuals. While the manuals they list there are all free, they will ask you to register.

Many times, the owner's manual will have the installation instructions inside.

If yours is not listed there for free, you would have to order it through the Sears parts site.

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

You will probably be able to download the installation instructions from the Sears parts site.

Just enter your model number there.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

On the resulting page, look to the right for the blue "View manuals" button. Click there.


That Sears-related site has many free manuals. While the manuals they list there are all free, they will ask you to register.

Many times, the owner's manual will also have the installation instructions inside.

If yours is not listed there for free, you would have to order it through the Sears parts site.

For repair service on Kenmore appliances, see Sears Service.

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

You may be able to download the installation instructions from the Sears parts site.

Just enter your model number there.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########.

On the resulting page, look to the right for the blue "View manuals" button. Click there.



That Sears-related site has many free manuals. While the manuals they list there are all free, they will ask you to register.

Many times, the owner's manual will also have the installation instructions inside.

If yours is not listed there for free, you would have to order it through the Sears parts site.

For repair service on Kenmore appliances, see Sears Service.

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

You can find handy exploded views and part numbers at the Sears Parts Site.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

On the resulting page, look to the right for the blue "View manuals" button (it may look different than this now, due to a recent site update). Click there.



That Sears-related site has many free manuals. While the manuals they list there are all free, they may ask you to register.

Many times, the owner's manual will have the installation instructions inside.

If yours is not listed there for free, you would have to order it through the Sears parts site.

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

You may be able to download the installation instructions from the Sears parts site.

Just enter your full model number there.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########
On the resulting page, look to the right for the blue "View manuals" button. Click there.



That Sears-related site has many free manuals. While the manuals they list there are all free, they will ask you to register.

Many times, the owner's manual will also have the installation instructions inside.

If yours is not listed there for free, or does not contain the template, you would have to order it through the Sears parts site.

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

You may be able to download the installation instructions from the Sears parts site.

Just enter your model number there.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

On the resulting page, look to the right for the blue "View manuals" button. Click there.



That Sears-related site has many free manuals. While the manuals they list there are all free, they will ask you to register.

Many times, the owner's manual will also have the installation instructions inside.

If yours is not listed there for free, you would have to order it through the Sears parts site.

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

You should be able to order an owner's manual from the Sears parts site.

Just enter your full model number at their site.

A full Sears/Kenmore model number normally has 3 digits, a dot, then 8 more digits, such as ###.########

On the resulting page, look to the right for the blue "View manuals" button. Click there.



That Sears-related site has many free manuals. While the manuals they list there are all free, they will ask you to register.

Many times, the owner's manual will have the installation instructions inside.

If yours is not listed there for free, you would have to order it through the Sears parts site.

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

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

Just enter your full model number at the Sears parts site.

On the resulting page, look to the right for the blue "View Manuals" button.



That Sears-related site has many free manuals. While the manuals they list there are all free, they will ask you to register.

Many times, the owner's manual will have the installation instructions inside. This is where you will find that information.

If yours is not listed there for free, you would have to order it through the Sears parts site.

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