How to resolve our problem in canon ip300..it says thay it has service error 1500?

1. hold RESUME then press & hold POWER
2. release RESUME, then press it twice, the light should go amber then green again.
3. you're now in service mode (you can release POWER now)

for reset waste tank reset is 4 presses of the RESUME button. To confirm, press POWER once
Hope this helps. Please rate my response.
Thanks.
Have a good day.