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If a new bulb does not work, then it is most likely something else, perhaps the wiring or a connection. You can probably have your machine serviced to get it fixed, or go purchase a light that you can place close to your machine to light the sewing area. There are lights available with attachment clips and a bendable neck that well let you get the light in the right spot. There are also strings of LED lights available on eBay that you can attach to the upper part of the throat to light the work area. I replaced my regular sewing machine bulb with an LED bulb and was surprised how much better it lights.
look on the left side of the machine and see if you see a little round plastic circle, very very carefully use a screw driver to pry it out , there should be a screw to unscrew and the side should come off so you can replace the bulb. if you will send me a comment with the complete name and model number, I'll see if I can find you a manual.
I'm not specifically familiar with the 830 model, but all the other Berninas I've dealt with are very similar.
First, disconnect the power cord from the wall socket - safety first!
The housing for the lamp is in the hinged piece at the left (needle) end. It's hinged at the back (two hinges, one above the other like a door) and it's simply a matter of placing the palm of the left hand over the lamp switch with the thumb on the front above the needle and the tips of the fingers at the back of the machine, then opening the housing by twisting it away from the body of the machine from the front. It's held closed with a spring clip, so a little pressure may be required.
Once opened, the lamp and its holder are easily accessible. Remember the lamp is probably a bayonet fitting, so a little pressure to push the bulb into the contact springs and a slight twist in the same direction as you would turn a screw to undo it, and the lamp should come out. Avoid too much pressure on the lamp, as the glass part can part company with the metal base. If it does break, getting the metal base out is a bit of an issue, but it can usually be achieved with a pair of long-nosed pliers. Be very careful not to break the lamp holder - they can become quite brittle.
Having obtained a suitable replacement lamp of the same fitting size and wattage (most are 15 W), fitting it is simply a matter of pushing the lamp base into the holder and twisting it to lock it in place, then closing the housing.
If you still have original Acessories there should have been a grey or brown cone shaped rubber gripper that could be slid up on bulb to assist in turning it If not remove the side cover, then back cover to access the bulb. Some 1008's have push in bulb others screw in so be careful not to break bulb as you remove it
push in bulbs must be pushe in and rotated 45 degrees counter clockwise to remove. Of course screw in bulbs just rotated counter clockwise to remove
The light from a light bulb is caused by the metal filament being white hot, over 1000 degrees Centigrade, so touching hot isn't too much in those circumstances! However there may be a ventilation problem in the bulb area but our machines are just the same in the bulb area. A bulb that has gone black has had an air leak into the glass envelope and this it may well be a just poor quality bulb.
Are you getting the correct bulb? Some shops will supply one for a normal light which has a weaker construction and is not suited to vibration and working in an enclosed area. If you (or the shop) use a bulb with a higher wattage than specified with the good intention of supplying a better light it could also be supplying more heat....
A genuine Janome bulb - if you can get one - may cost more but should last a lot longer. I don't want to say your sewing supply shop is not providing the right bulb but ....
The other possibility is that you have just had a run of bad luck to counteract someone else's good luck of not having a bulb blow. Sorry (but thanks!).
Finally, try to avoid touching the bulb with your bare hands when you fit the new one. All peoples, everybody's, hands have a natural layer of oils on the surface that can cause hot spots on a bulb surface and make it blow. If you have any acetone type thinners (nail varnish remover) give the bulb a wipe over with that before fitting to make sure it is thoroughly clean and use a piece of new clean cloth to hold it when you are fitting the bulb.
There is no button to turn on the light. When the machine is turned on, the lights come on. If they are not working it means that one of the bulbs needs replacing. If one bulb blows, neither light works. The bulbs are readily available from auto spare parts shops. See page 110 of your manual for instructions on how to replace the bulb.