Hello and Welcome to FixYa!
Hmm, faint printout may occur due to so many issues, like paper quality, bad connection, bad/dirty pick-up roller, wrong settings...
To counter all these issues, writing all the text here will be difficult and will decrease the understanding quotient. So I'm attaching a link below, where you will find all the possible solutions with pictorial / graphical representations, I hope you will find it helpful and will definitely come up with some solution.
In Case you are having any issues/questions, do ask me. I'm here to help.
If you think I was of help, your token of appreciation in the form of rating will be esteemed.
Concerned, Nooh
P.S: Resolving Print quality issues