Composite Black Xerox 6120

Hi there,
Guys, I truly need your help on this issue.Let me summarise the problem.
I have a customer with a Phaser 6120 with the latest PPD available in xerox.com installed on a Macbook 10.8.Also he has installed the latest firmware version available for this particular printer. So printer is printing perfectly but there is a little issue that is driving me crazy.
Customer prints from Microsoft Word and when he select Grayscale/Black and White the printer counts that as a monochrome printed page. Please note he is printing a word document with colour contained on it.
Well, if he uses his macbook, and prints from Microsoft Office 2004, he says that the machine is counting the print job as a colour job, I asked him to send me a PS file, then I sent it to my own 6120 and the job is counted as monochrome, so I asked for the original file and just modifying the colour to grayscale I printed off a couple of examples, in both cases the machine counted those as monochrome but the customer is saying that his printer is printing with composite black.
can anyone give me a hand with that?
has the Mac OS version anything to do with that? I'm thinking in ColorSync.
If you need more information just let me know, I'm getting crazy with this case.
Thanks in advance
Message was edited by: alatryste
Message was edited by: alatryste

I've seen a similar issue with Word 2004 and Canon iR copiers. If the Word file contains B&W Clip Art or colour images that have been converted to greyscale within Office, the document still prints in colour.
When RGB applications represent grey objects, they often represent the colour of these objects as RGB in equal amounts. When that gets transferred to a CMYK colour space, the result is usually equal amounts of CMY, and possibly K, and this will eventually be interpreted by the Postscript engine as registration (CMYK) black and therefore invoke a colour click.
For our copiers using a EFI 'Fiery' controller, a profile is available called 'Max GCR'. This profile tells the Postscript engine to replace equal amounts of CMY (or RGB) with black (K) and therefore will represent RGB objects as a shade of black and induce a B/W click on the printer.
For the copiers without a Fiery, the Canon board has a setting called 'RGB Pure Black Process'. Maybe your Xerox Phaser has a similar setting that isn't enabled on the customers printer?

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