My L key is stuck DOWN! How do i fix that ?

If your Smith Corona XD 5500 typewriter is only producing specific characters and some buttons are not working, there are a few potential issues you can investigate:

1. Check for Stuck Keys: Make sure none of the keys are physically stuck or jammed. Press each key to see if they respond properly and if any are consistently stuck in the down position.
2. Clean the Typewriter Mechanism: Over time, typewriters can accumulate dust, debris, or dried ink, which may impede the movement of keys. Use compressed air to blow out any dust and try to clean the typewriter mechanism.
3. Inspect the Ribbon and Correction Tape: Check the typewriter ribbon and correction tape. If the ribbon is improperly installed or the correction tape is stuck, it can affect the functioning of the keys. Ensure that the ribbon and correction tape are correctly threaded.
4. Check for Mechanical Issues: Inspect the internal components for any visible signs of damage or misalignment. Ensure that all the moving parts are functioning smoothly. If you notice any broken or misaligned parts, you may need to seek professional repair.
5. Verify the Keyboard Switch: Some typewriters have a switch to toggle between different character sets or functions. Check the user manual for your specific model to see if there's a switch that might be affecting the keyboard.
6. Test the Typewriter in Manual Mode: Most typewriters have a manual mode where you can type without the ribbon or correction tape engaged. Test the typewriter in manual mode to see if the issue persists. This can help determine if the problem is related to the typing mechanism or the printing elements.
7. Consult the User Manual: Refer to the user manual for your Smith Corona XD 5500 for troubleshooting tips and information about the specific features of your typewriter.
8. Professional Repair: If the issue persists and you're unable to identify or resolve the problem, it may be necessary to seek professional repair. Contact a typewriter repair specialist or a local office equipment repair service for assistance.

Remember that working with vintage typewriters may require specialized knowledge, and attempting to disassemble the typewriter without proper expertise can lead to further damage. If in doubt, it's advisable to seek professional assistance for repairs.

Question edited for clarity, make and model (what it is).
Question moved to Smith Corona.

You have a stuck key, the one that is typing the same letter! It probably needs a good service as no one has used a portable typewriter for 30 - 35 years :>D

https://www.google.com/search?q=SL470+stuck+key

..

The usual cure is lubrication unless there is mechanism failure.

space bar key switch is stuck or bad, or needs cleaned

No code key switch is bad or needs cleaned

make sure the right hand platen knob is tight hold the platen and turn the knob top toward the back of the typewriter until it is tight

It sounds like your "code" key may be stuck down. See if it is lower than the other keys. Check for a paper clip or staple under the key. Depending on how the keyboard is made you might be able to spray contact cleaner under the key to get it unstuck. I would bend a paper clip with a small bend at the end (90 degree angle) and use it to gently move the key up and then use my finger to press it back down. Do this several times after spraying contact cleaner under the key. Hope this helps.

if the lever is loose you should be able to lift it up and down if so look for the pivot screw see if has LOOSEND UP

The tab button may be stuck or the carriage release lever is stuck or a broken escapement.