Cause

The 1640 support code signifies that the printer has detected that the remaining ink in one or more of the ink tanks may have reached the lower limit line shown on the ink tank. 
 

What to Do

To check the remaining ink level, visually inspect the remaining ink in the ink tank. Then, you should take one of the following steps:

1. Press the OK button on the printer. If there is some residual amount of ink in the tank(s), you will be able to print until the remaining ink is depleted, although image quality may diminish as the remaining ink in the tank(s) becomes depleted.

   Please note that if you continue to print when the remaining ink is below the lower limit line, the printer may consume excess ink as it attempts to return to normal image quality after it is refilled with ink.

   Once you press the OK button, the function for notifying you of the remaining ink level will not operate. To restore that function, refill the ink tank(s) up to the upper limit line shown on the ink tank(s), and then press the OK button for at least five seconds, and then release it. 

   OR

2. Refill the ink tank with the corresponding color of ink up to the upper limit line shown on the ink tank.

   You will then be able to print.

If your product issue was not resolved after following the steps above, or if you require additional help, please create or log in to your Canon Account to see your technical support options.

Or if you still need help, visit our Canon Community by clicking the button below to get answers:

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