Lexmark X6170 When I send a fax, it comes out black on their side. What going on?

Received fax is unreadable or blurry
Please go through the checklist below to see if the suggested action(s) can resolve the issue.

* Make sure the copy function is working well.
* Print a Clean nozzle page from the Maintenance menu. If the printout has unexpected white or color horizontal streaks or missing portions, print the Clean nozzle page again. If you are still experiencing streaks or mission portions, you may need to replace your cartridge(s).
* The cartridges may need to be aligned.
* You may need to ask the sender to increase their fax quality.

Sent fax is unreadable or blurry.

1. If the receiving party indicates that the fax output is unreadable or blurry, you may want to try increasing the fax quality.
2. Check the scanner glass for excess amounts of smudges and/or fingerprints. If the scanner glass needs cleaning, moisten a clean, lint-free cloth and gently wipe the scanner glass. Make sure the scanner glass is dry before scanning the next document.