Unusual problem with halm jet press

My jet press will only print 1 up on first unit. Every time I print 2 up the 2nd unit is always good, but the image on the 1st unit looks washed out every other envelope. Even though 2 unit prints fine. It's only every other envelope on first unit that looks washed out. Any suggestions?

 

Hello I am the former Western Regional Sales & Service Manger with Halm Industries. This is something I've seen a million times and very easy or expensive to fix. Your problem could be a combination of things. First unit may have elevated if you had a massive jam up. Impressions may need to be reset back to factory specs. Or your cylinders may be out of round causing them to hit and release with every rotation the press makes.