Question about HP DeskJet 1600C InkJet Printer

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The magenta cartridge prints very faint on half of page

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I now know the reason for problem. It is in fact a design problem by HP. They have not protected the laser scanner unit properly. Toner powder can get into the laser unit. To cure the problem you have to strip down some of the printer. First remove the toners, Remove the back cover remove two PCB under the rear cover, then remove the supporting metal panel. Then removing the laser unit. There are two small spring metal cover plates that have to be removed to get the bottom two screws of the laser unit. Best to the lean the printer on its front as these plates are on the bottom of the printer.

When you have got that far, you have to remove a small spring and then undo just one screw that holds the laser unit plastic front cover.

When this cover is removed you can see the fancy optics of the laser unit. You will find a covering of toner dust all over, the angled mirrors and lenses. The bottom angled mirror having the most toner dust this is the magents mirror.

I used a camera lens cleaning brush to remove all of the toner dust. Shining a small tourch around will high lite the dust on the various parts.

When this is done then you have to re-assemble it all.

If everthing has been done correctly then you are back in business.

Posted on Jul 17, 2009


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1. Check if the cartriges are correctly installed:
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2. Print a diagnostic page and clean print heads, using the printer cleaning utility:
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The other week I had the black print head clog up, requiring daily nozzle deep cleaning [a normal 'ocassional' maintenance function]. Thought I needed a new Print head, so anything worth a try.
I loaded up an old black cartridge [I load all my own......always have] with Isopropyl Alcohol and ran deep clean on that cartridge a couple of times, then repeat printed [6 times] a page full of the number 8 in about half inch character size, to get the alcohol through the nozzles. then Deep cleaned again 3 times, to wash it through the print head.

I reloaded the normal ink filled cartridge and ran the '8' page again till I got good black output. It has now been working without problem, daily, for over a week. Clearly if it's a Magenta only problem, the cleaning as described above would be a bit different, as the magenta is one of 4 colour cartridges.
My printer does quite a lot of work, and was bought at least a couple of years ago, being used daily for alpha numeric and photo printing work. This was the first difficulty I experienced with it.
Hope the above might help.Ken

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If your color improved slightly when running the printhead option then doing more should help get better results. Sometime the printheads get really dirty/clogged and running the cleaning option more then once is needed.

If you get a slight line running across the page (from left to right) usually the indicates dust build up on the printhead or ink carriage. The dust acts as a paint brush being dragged across your paper as the carriage moves across the page during printing. You can clean the bottom of the carriage with a Q-tip or purchase some cleaning paper for your printer.

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