Canon MG3680 Cartridge Compatibility and Troubleshooting

While it's true that Canon MG3680 and MG3620 cartridges share a similar design, they are not directly compatible.  Using an MG3620 cartridge in an MG3680 printer might lead to recognition issues due to differing chip configurations.  

If you're experiencing cartridge incompatibility issues with your MG3680, here's a breakdown of potential causes and solutions:

1. Cartridge Chip Recognition:

 Solution:  The most likely culprit is indeed the cartridge chip. Contact your cartridge supplier for assistance in replacing or reprogramming the chip for MG3680 compatibility.  

2. Print Head Issues:

 Possible Causes:
     Air bubbles in the print head
     Clogged print head nozzles
     Prolonged printer inactivity
 Solutions:
     Air Bubbles:
        1. Run the print head cleaning cycle 3 times, waiting 5-10 minutes between each cycle to allow the ink to flow.
        2. If the issue persists, carefully remove the cartridges and locate the ink outlet columns.
        3. Using a syringe without a needle, gently insert it into the corresponding color column (e.g., yellow column for a yellow ink issue).
        4. Ensure a tight seal between the syringe and the column, then slowly draw air out 2-3 times to remove any bubbles.
        5. Reinstall the cartridges and run the print head cleaning cycle twice.
     Clogged Nozzles:
        1.  Prepare 4 to 6 syringes (20ml capacity) with the needles removed.
        2.  Perform a nozzle check print to identify the affected colors.
        3.  (Consult a printer repair guide or professional before proceeding with the following steps, as they involve handling delicate printer components.)
        4.  Using the syringes and appropriate cleaning solution, carefully flush the affected nozzles.
     Prolonged Inactivity: Run the print head cleaning cycle several times to prime the ink flow. 

3. Other Possible Causes:

 Foreign Objects: Check the printer for any obstructions, particularly in the paper path and cartridge carriage area.
 Empty Ink Cartridges: Ensure that all ink cartridges have sufficient ink. If using a continuous ink supply system (CISS), ensure it's properly primed and filled.
 Ink Level Reset: After refilling cartridges or using a CISS, you may need to reset the ink level using your printer's control panel or software.

4. General Troubleshooting Tips:

 If the printer displays a warning light, refer to the user manual for specific error codes and troubleshooting steps.
 For persistent issues, consider contacting Canon support or a qualified printer technician.

Remember: While online resources can be helpful, it's essential to exercise caution when attempting DIY printer repairs to avoid causing further damage.