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HP 3755 Printer, Black Ink Mystery

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Printer is an HP DeskJet 3755.  It uses a tri-color cartridge, and a 
black cartridge.  It's connected to various Windows computers via a 
Netgear router.  Connection is fine.

The black cartridge is empty, as demonstrated by the fact that when 
printing a 'Test page', all that is printed is the blue printer icon, and 
also in blue, the words "Windows Printer Test Page".  

When printing any multi-color document, all colors are printed, but 
nothing black, such as text, appears.  OK, it's out of black, but...

If I use the printer's control panel to print out internal reports such 
as "Printer Information Page", or "Printer Status Report", which are in 
black text, these reports are printed perfectly in black.

How is this possible?

Hmmm...print jobs issued from Windows don't print black, but print jobs 
issued internally from the printer's control panel do print black.

I downloaded and ran HP's Print and Scan Doctor for Windows.  It said it 
corrected a printer issue (it didn't identify the issue), and then went 
on to check ink and printing quality, such as alignment and cleaning 
printheads.  The result was that colors were fine, alignment was fine, 
but it didn't print out any black patterns, saying that the black 
cartridge was empty.

So, HP's own diagnostic verified black ink was empty.

But where does the black ink come from to print the internal reports, 
perfectly?

Any ideas?  

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HP 3755 Printer, Black Ink Mystery Boris <Boris@invalid.invalid> - 2024-11-27 23:31 +0000
  Re: HP 3755 Printer, Black Ink Mystery Tony <lizandtony@orcon.net.nz> - 2024-11-28 19:22 +0000
    Re: HP 3755 Printer, Black Ink Mystery Boris <Boris@invalid.invalid> - 2024-12-27 05:59 +0000
      Re: HP 3755 Printer, Black Ink Mystery Tony <lizandtony@orcon.net.nz> - 2024-12-30 09:30 +0000

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