HP Photosmart 7510 - L:ooking at my Print Quality Diagnostic Reports - Why so many more "PHA Drops?"

My Photosmart 7510 C311a indicates it has printed about 7500 pages since I purchased it in about November 2011.
Tonight, after replacing the Cyan ink cartridge, I ran the cartridge alignment and then printed out the Print Quality Diagnostic Report. As I was checking it out, I noticed the mention in 11, 12, 13, and 22 of the words:
11. PHA Installed: 01/24/2012
12. PHA TTOE Completed 1
13. PHA Hex ID: K: 3ff11948_5c3f230b, C: 00f11d60_5b421f06
and on the line across the page for Item 22, with numbers under each color cartridge,
(Cartridge Color)       Photo                  Magenta             Cyan                    Yellow                     Black
22. PHA Drops          1493032000   4700387000   7245406000   51771850000   13001389000
While these numbers are very large, I was curious as to how quickly the grew in the very short time (like five minutes) between the time I ran the first diag report and then aligned the heads and ran another diag report -- at the most it was five minutes and I printed nothing in between. Then, after calculating the growth in each number, in about ten minutes, I ran another diag report and the numbers grew again. For each color cartridge, over the three tests, with no more than ten minutes between tests and with nothing but the three reports printed, here are the three sets of numbers  for "PHA Drops."
Photo        1493032000       1494847000         1496485000
Magenta    4700387000        4702380000        4704197000
Cyan           7245406000        7247860000          7249779000
Yellow        5177185000         5179178000        5180995000
Black          13001389000      13008428000      13013963000
Between the first and the second diag reports, the numbers for each cartridge increased by the following numbers:
Photo           1,815,000
Magenta      1,993,000
Cyan             2,540,000
Yellow          1,993,000
Black            7,039,000
I didn't bother to calculate the change in numbers between test 2 and test 3, but I suspect the numbers will be similar.
My question is this: What exactly is the definition of a "PHA Drop" and how does it fit into whatever the "PHA-related process" entails?
I have read two or three "PHA Drop" related queries and answers on the HP Forums and the answers -- bluntly -- sound like the answer-maker either has no real idea what is involved - or - thinks nobody on the forum could understand the real answer. Bad form..
I don't think there is a 'conspiracy to deny' here and I don't even think the PHA Drop is something I must know about to sleep tonight -- but, it is an obvious and open part of the information that HP has seen fit to include in every Print Quality Diagnostic Report and one of the posted answers states that the whole PHA 'thing' is only used for "diagnostics."
Okay, diagnostics run by whom and when and where and for what purpose? A really good, complete and accurate, fact-based answer might even help HP Users better understand the equipment we have spent good money to acquire and use.
Answer please.
Thanks
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PHA stands for Print Head Assembly. This is the assembly of the color and black printheads and the electrical interconnect.
PHA drops are the individual ink droplets printed. An individual drop is very small, on the order of 5 x 10 ^-12 liters for color, perhaps larger for black. I would not be surprised to see 7 million black drops on a page. At 600 dpi one square inch of paper would take 360,000 drops so 7 million drops would be about 20% coverage of the page if all the ink were used for printing There will also be some ink used for servicing to keep the printhead clear. The document here has information on how ink is used.
The diagnostic page is useful in cases where there is a problem in printing and you call HP support. They may have you print a diagnostic page and may ask for some of the particular lines to help diagnose the issue. There are a large number of items in the diagnostic page that can be of interest to the support folks (or the engineers during development) but for the most part they are not useful for the end user.
Bob Headrick, HP Expert
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Hello RayGo75 ,
Welcome to the HP Forums.
I see that you would like some explanation on the Print quality diagnostic report.
You stated that you attached a copy of the report that you would like reviewed but unfortunately, It is not listed on this thread.
Please reattach it and I will be happy to go over it and explain any details that you need covered.
Cheers,
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I am not an employee of HP, I am a volunteer posting here on my own time.
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I am not an employee of HP, I am a volunteer posting here on my own time.
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Bob Headrick, HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
If your problem is solved please click the "Accept as Solution" button ------------V
If my answer was helpful please click the "Thumbs Up" to say "Thank You"--V

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HevnLgh
I work on behalf of HP
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Hey @LK8888,
Welcome to the HP Support Forums!
I understand that you want to be able to scan with good quality on your Mac OS X 10.9.5 Operating System from your HP Photosmart 7510 e-All-in-One Printer. I would like to assist you with resolving this issue. Now you did state that you had quite a time with HP Technical Support trying to get your Mac to recognize your Photosmart. I'm afraid that if your scanner isn't working properly we may have to undue some of the steps completed by Technical Support to resolve this issue once and for all for you. However, before I have you delete or remove any software and drivers from your computer, could I have you take a look at the following document to ensure that you're using the proper scan software:
Scan from OS X v10.9 Mavericks With the Full Feature HP Software for HP Multifunction Printers
If everything now works perfect, great! If not, than unfortunately I'm going to need you to run through the following steps.
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HP Photosmart 7510 series C311 Full Feature Software and Drivers
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Please let me know if the steps provided resolve your scanning issue. Good luck!
X-23
I work on behalf of HP
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HP Photosmart 7510 - L:ooking at my Print Quality Diagnostic Reports - Why so many more "PHA Drops?"

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