Question: How can I fix my WF-3620 printer after encountering Error 0x97, attempting several cleaning cycles, and still facing printing issues?

Answer: To fix the Error 0x97 on your WF-3620 printer, which usually indicates a problem with the printhead, follow these steps for replacing the printhead:

1. Begin by opening the printer to gain access to the printhead. Remove the CSIC board and the base to reveal the printhead.
2. Unscrew the three screws that are holding the printhead in place. This will allow you to remove the printhead.
3. Once the printhead is removed, disconnect the two large FFC (Flexible Flat Cable) cables.
4. With a new printhead ready, reconnect these FFC cables before placing it back into the printer. Make sure it fits well into two guiding slots or "plugs". These terms are used loosely to describe the alignment mechanism for the printhead, not actual electrical plugs.
5. The printhead should slightly snap into place when correctly aligned. Secure it with the three screws, ensuring proper alignment with the guiding slots.
6. Reattach the CSIC board to the base, making sure it fits into its designated spot accurately.
7. Reassemble any other parts of the printer that were removed and ensure everything is securely in place.

By following these steps and replacing the faulty printhead, you can address the Error 0x97 and get your printer back to working condition. Keep in mind that continuous errors without proper resolution could lead to further issues, such as motherboard failure (Error 0x9A), so it's important to tackle the Error 0x97 as soon as it arises.