HP OfficeJet 4500 and OfficeJet 4600 both not copying any more but will scan and print

Question

My computer/networking business has 3 HP OfficeJet AIO printers: 2 x 4500 (about 2 years old) and 1 x 4600 (about 6 months old). Only the one 4500 is still able to do everything it should. The others can both print and scan but can't copy any more. (The failures happened at different times). I have no idea about faxing because we never use this function - we don't have a landline to test it.
This is nothing to do with the PCs because we're just trying to use the standalone copy function directly from the printer. It makes no difference whether we place the document on the glass or in the auto sheet feeder. At one point, the 4600 was able to make colour copies but not mono copies but now it can't do either.
We have always used only genuine HP cartridges in both printers and they have been replaced recently - as I say, we can print fine, we just can't copy.
Clearly this isn't a software/driver issue but I can't understand how it can be a cartridge or scanning issue either (you can hear and see that it scans the document, it's just that nothing comes out on the paper). Is there some kind of firmware linking the scanning to the printing function that could have gone wrong? If so, how do we fix that? The 4600 self-updates using its wireless internet connection so it should be on the latest firmware.
Thanks.

Answer 1

Hi,
Please try printing a Self Test report for both of the printers, can you see both Black, Cyan, Magenta and Yellow colors listed as expected?
Below are the steps for the 4500:
http://support.hp.com/us-en/product/HP-Officejet-4​500-All-in-One-Printer---G510g/3919445/model/39194​...
For the 4630 print a self test as following:
On the printer control panel, press the Down Arrow () to scroll to Tools, and then press OK.
Press the Down Arrow () to scroll to Print Quality Report, and then press OK. The printer prints the test page.
Figure : Example of a Print Quality Diagnostic report with no defects
If both of the tests appear fine, is the printer connected directly to a wall socket or may it connected through any power strips, hubs, surge protectors. etc.?
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