To Whomever gets this! :)
Changed black ink as ut signalled low...used new HP 61 cartridge; ran alignment, scanned it. Then printed my spread sheet...had 3 quarter inch blank streaks across ...went to printer help page...cleaned heads...did diag.test + all the other steps I believe... printing getting worse with blank spaces or blank streaks across spread sheet. My paper is fine...same I have used since I got this printer. HELP! Sincerely, Marla