I am having a rough time keeping up with this story. Two new printers down during a big job you outbid someone on. Your other 500 series is working good and you went with new 300s and they are breaking down. Years ago I had a HP5500PS printer and swore I would never buy a HP again. I know people love them. Like a boat, the two happy days where the day I bought it and the day I sold it.
But getting back to your story, good luck with your printers and getting the work completed. You need a nice vacation.
We are down to 3 machines, 2 570s and 1 365. The 365 is brand new, HP replaced our 360 with it as they couldn't repair the 360 for nearly 5 weeks. The 1 570 is only 8 weeks old and then we bought a 570 about 4 weeks ago and that one was defective. On June 29th they replaced the defective 570 with a new one.
So our 8 week old 570 the heating modules and ink pump system went out on July 3rd. Then on July 7th the brand new 570 the ink pump is no longer working.
With this job we are pushing these machines very hard and testing their limits, well we certainly found them. I just hope HP uses this as a primer to make another level of machine priced between $25k and $180k for those of us that would gain little benefit from the 1500 but need something designed to take abuse.