Installed a new ink cartridge, but the print quality is not improved.

While i installing the new ink cartridge, i have dislodged the print head from the carrier. I have replace ink cartridge many times but again and again printer shoe poor print quality and make mistakes while printing. I also try another to manage this issue but problem again same as it. Anybody can help me to remove or handle this query. Please explain to minimize that cause.
Thanks.