Tap 10 test: Order of nozzle check patterns?

[DaveReading]

I often use the Tap 10 test to check for possible nozzle blockages.  This prints a series of nozzle check patterns across the top of the page, one for each colour of ink.

So, for example with Tri-colour and Photo cartridges installed, you get 6 check patterns for (in order from left to right) magenta, yellow, cyan, light magenta, photo black and light cyan (the last 3 obviously from the Photo cartridge).

With a Gray cartridge (HP 100) installed instead of the Photo cartridge, I get the same first three patterns (magenta, yellow, cyan), but then a gap where the first pattern from the Gray inks should be, followed by two further patterns in (differing) shades of gray/black.

See attached photo for the two Tap 10 nozzle check patterns.

I would very much like to find out which of the three gray/black inks (normally described as gray, dark gray and light photo black) is missing.  One might have thought that information on which order the Tap 10 test prints the 3 nozzle patterns for the HP 100 would be readily available, but I can't find that anywhere.

Does anyone have this information?  I can't believe it's some kind of official secret.

MTIA

Dave

[sandytechy20]

@DaveReading

Welcome to the HP support community.

I have brought your issue to the attention of an appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post personal information (serial numbers and case details).

If you are unfamiliar with how the Community's private message capability works, you can learn about that here.

Thank you for visiting the HP Support Community.