Printing Blank Sheets

https://www.google.com/search?q=Konica+Minolta.+Why+doesn%27t+the+blade+clean+the+magenta+after+printing+color

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Not an expert on this brand of printers but it looks like dirty feeder rollers to me. Try cleaning them and Print a Blank document and see if the marks show up

replace the drum

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

On the 5430 DL there is an aux legal tray that can be purchased for legal printing. On a later successor the 5550 a manual feed option was included, however for the 5430 there is no option for printing legal without the extra tray being installed. On a side note, I have this tray and when not printing legal it lets me load an extra 500 sheets of letter paper which is very convenient when I need to print a bunch of sheets overnight.

Ask if the ones sending are sending legal size, it may be using 2 sheets to get all from a legal size document.

http://geiohio.com/remove-blank-page-konica-minolta

The streaks are typically a sign of a toner drum going bad, or possibly just dirty, or even caused by the toner being low, as you have mentioned it to be. 1 way I know to 'clean' the drums is to have the printer run multiple blank pages. If your software will not allow you to print blank pages, type a single character by using this little trick, hold down the ALT key, and type 2 5 5 on the number pad in a blank text document. This will allow you to print the "blank" document, I would suggest about 10 copies. This should help for a short duration, and doesn't use any toner.

Hope this helps!
Backu

you have unused toner in the media path. run a blank print job through 2-3 times and it will clean the path

pleas make color calibration from printer quality menu and try again

did you put these envelopes right way (portrait/landscape) also you have to change in printer menu paper source paper type from plain paper to envelope.