Replace lightbulb and charcoal filter?

On page 20 of your owner's manual:

To replace oven light:
1. Disconnect power at main fuse or circuit breaker or pull plug.
2. Remove the top grill by taking out the 2 screws that hold it in place. (See Figures 3.)
3. Remove charcoal filter.
4. Pull out the Lamp cover. (See Figure 4.)
5. Replace the light bulb with a 30-watt bulb.
6. Replace light housing to original position
7. Replace charcoal filter.
8. Replace top grill and secure with screws.
9. Connect electrical power.

Hello - This may or may not be specifically for your model, however these are generics instructions that I found.

To replace the light bulb to the over the range microwave you will need to follow the steps below:

1. To replace light bulb, first disconnect power to the microwave oven at the circuit breaker panel or by unplugging.

2. Remove the vent grill mounting screws.

3. Pull the vent grill away from the unit.

4. Remove the charcoal filter by pushing it inwards, then turn and pull it away from the unit.

5. Open light cover located behind filter mounting by carefully pulling up on the front edge.

6. Remove old light bulb and replace only with equivalent 30 watt bulb available from part distributor. Bulbs are also available at most hardware stores or lighting centers.

7. Replacing the microwave oven light cover by carefully pushing into place. Replace the charcoal filter. Push the vent grill back into place (engaging both the bottom and top tabs) and replace the vent grill mounting screws.

Note: DO NOT USE BULB LARGER THAN 30 WATTS.

Replace the burned-out bulb with a 120 volt, 30-watt incandescent bulb (WB36X10198), available from your GE supplier

• 1 To replace the oven light,

first disconnect the power at the main fuse or circuit breaker panel or pull the plug.

• 2 Remove the top grille by

taking out the 2 screws that hold it in place.

• 3 Remove the charcoal

filter (if present) to access the light cover (see Remove Charcoal Filter section).

• 4 Remove the light cover

located near the center of the oven that holds the bulb. Remove the bulb by gently turning. Replace with the same size and type bulb.

• 5 Replace the light cover

and charcoal filter (if present).

• 6 Replace the grille and

screws. Connect electrical power to the oven.
The full owners manual can be found here: http://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=49-40474.pdf

It's pretty simple.

It's covered on page 33 of the service manual found online here.

You can pre-order bulbs by entering your full model number (JVM1631WJ03) here.

1 To replace the oven light,
first disconnect the power
at the main fuse or circuit
breaker panel or pull
the plug.

2 Remove the top grille by
taking out the 2 screws
that hold it in place.
See video here.

3 Remove the charcoal
filter (if present) to
access the light cover
(see Remove Charcoal
Filter section).

4 Remove the light cover
located near the center
of the oven that holds
the bulb. Remove the
bulb by gently turning.
Replace with the same
size and type bulb.

5 Replace the light cover
and charcoal filter
(if present).

6 Replace the grille and
screws. Connect electrical
power to the oven.

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

Grease filters change from the bottom side of the unit.

Charcoal filter is changed as follows:
To Remove Charcoal Filter
To remove the charcoal filter, disconnect power
at the main fuse or circuit breaker panel or
pull the plug.
Remove the top grille by removing the screws
that hold it in place and sliding the grille to the
left (opening the door makes grille removal
easier). Slide the filter towards the front of the
oven and remove it.
To Install Charcoal Filter
To install a new filter, remove plastic and other
outer wrapping from the new filter.
Insert the filter into the top opening of the oven as
shown. It will rest at an angle on 2 side support tabs
and in front of the right rear tab. Replace the grille
and screws.

The grease filter is changed from the bottom of the unit.

The charcoal filter is changed as follows:

To Remove Charcoal Filter
To remove the charcoal filter, disconnect power
at the main fuse or circuit breaker panel or
pull the plug.
Remove the top grille by removing the screws
that hold it in place and sliding the grille to the
left (opening the door makes grille removal
easier). Slide the filter towards the front of the
oven and remove it.
To Install Charcoal Filter
To install a new filter, remove plastic and other
outer wrapping from the new filter.
Insert the filter into the top opening of the oven as
shown. It will rest at an angle on 2 side support tabs
and in front of the right rear tab. Replace the grille
and screws.

Charcoal filter is behind the grille at the top of the oven. Find screws in front or at top of the grille and remove them.  Remove the grille by shifting to one side and pulling forward with the door open.  You should see a slot where the filter is inserted.  Remove old filter and replace with new.  Note which side of old filter is up and position the new one the same way.  The filter sits on tabs at the side and back.   Replace grille and screws.

It's Part No. WB06X10359.

There is no charcoal filter unless you replaced the standard filter with a carcoal filter. Also, it may have m=been changed to a charcoal filter if the unit was alterd during installation as a re-circulating vent, not vented to the outside via the roof or wall.

The filter (Charcoal or not) is on the bottom of the unit. Put your head under the microwave and look up, there it is.

External vent systems have the charcoal filter removed, generally at the time of installation, as it is not needed for this application.
The charcoal filter removes odors from internal recycled airflow.
There should be an aluminum grease filter that you can remove to clean in a warm soapy solution, let dry, and reinstall.