HP K5400 printer not printing black at normal quality

cranleighboy

Reputable
Jul 19, 2014
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HP K5400 printer not printing black on OS Windows 7 (which seems to restrict diagnostic choices).

If print is done with photo quality, black prints; if done on normal everyday quality, black does not print, or prints faintly.

The fact that photo quality prints black seems to rule out print heads & ink supply – but what else could be causing it?

Any ideas welcome!!