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Desingjet T120

Hello
I just inherited a Designjet T120.
It turns on nicely but immediately fails with the text: there is a problem with the printer or ink system.
I tried disassembling the printer head and cleaning the contacts, which otherwise looked nice and clean.
I can't get out of the error message anymore, But at some point today the regular menu comes up and I ran all tests which were ok except the ink cartridge door, error code 51.01.10.
But now I can't access the the regular menu. 
Ink level is ok.
I can access the printer via network, but there is not other indikation than Printer Failure, 
Best Regards ang TIA

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