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Yes, the 5 blinking indicates towards print head. Before replacing the print head, please follow the steps below to remove the print head and then cleaning the copper contacts on them with a cotton swab dampened in distilled water until they are clean, after drying them reseat the print head and check the issue. If the problem persist then replace the print head.

1. Confirm that the printer is powered on.
   
   
2. Open the paper output tray and top cover.
   
   Note: Gently open the paper output tray while holding it.
   
   
3. Confirm that the print head holder has moved to the center.
   
   
4. Remove all ink tanks.*
   
   *i560 shown. i850 and i550 use BCI-3e ink tanks
   
   
   
   
5. Raise the print head lock lever and remove the print head.
   
   
   
   
6. Re-seat the print head into the print head holder and lower the print head lock lever until a click is heard.
   
   
   
   
7. Insert the appropriate ink tank into the slot at the right end and push down on the PUSH mark on top of the ink tank until a click is heard. Install the other ink tanks in the same manner.
   
   
   Properly installed:
   
   
   
   Improperly installed:
   
   
   
   Left Image: The M ink tank is not fully seated.
   Right Image: All ink tanks are not fully seated.