HP Designjet printer - printing lightly

I was asked by a potential customer about their HP Designjet 110 Plus printer - it is hooked to an very old Windows 2000 system.  The printer started printing lighter and lighter so the person went out to buy a black ink cartridge as it appears this is all they print in - the color cartridges have been in there since 2007/8 - at least that is what the dates say on them.  Any thoughts on what could be causing the lighter black - I cleaned the printer thoroughly  - there is no software on the system to clean the printheads as I have read in other posts.  Yes the obvious answer is to buy something else but looking for any answers for them on this now.
Daren Anderson, MSISPresidentAsked:
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hdhondtCommented:
The Designjet 110 Plus has a setting that reduces the amount of ink used. It's called something like "draft" or "eco" mode. It could also be called "high speed" mode as the printer will print faster in this mode. I don't have you printer, so I cannot check, but go through the driver settings and it should be obvious.

Note that, if this is your problem, you may want to change the default settings, from Printer Properties > Advanced tab > Printing Defaults button.
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arnoldCommented:
Echo hdhondt's suggest. The print quality is what controls the reduction of ink utilization making it appear lighter.
Perhaps changes in paper exacerbated the notice le difference.
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hdhondtCommented:
Good point, @arnold. Inkjet print quality is very dependent on paper type, so that could also be the reason. Test the printer with the correct (coated) paper type.
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Daren Anderson, MSISPresidentAuthor Commented:
This only started yesterday - they have been using the same paper and have not made any system changes
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hdhondtCommented:
If you're certain no driver changes have been made, then you may need to replace the printhead. See, for example:
http://www.precisionroller.com/print-heads-for-hp-designjet-110/products.html

Just for reference, printhead cleaning procedures start on page 24 of the Quick Reference Manual. The printhead replacement procedure starts on page 28 of the same manual.
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arnoldCommented:
Have not dealt recently, but if memory serves, hp cartridges have the head on the cartridge.
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Daren Anderson, MSISPresidentAuthor Commented:
We had cleaned the print heads last night as they described in the book.  The thing they talk about in the manual is that if there is a problem with the printheads, they may flash or not appear on the front panel - however they are all displayed as they should.  My first thought is the printheads but then think of this.
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hdhondtCommented:
Clogged printheads will not tell the printer to put up a message, even if they are permanently clogged. Most printers can print a test page which shows clearly if one or more jets are missing. For the DJ110+ I found the procedure in the Service Manual.
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arnoldCommented:
Try the following, open notepad.
Type sonething, hit print, look through the properties, dealing either reference to print quality, resolution I.e. Instead of 200x200 look at 300x300

Have not recently had, but the setting deals with the print quality, while paper ... These days though the issue deals with bleed through, not.....

Not sure whether the printer itself has settings, I.e. If network printer, access the web portal or trigger the output of the default printer settings.
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Daren Anderson, MSISPresidentAuthor Commented:
They replaced the printer head
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