Question about HP Officejet Pro 8500 Wireless All-In-One InkJet Printer

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I recently changed my carriage belt.The print quality has ever been so bad.Does not print clear lines,especially with the black ink.Always have some white lines within...Thank you. Nima

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  • nima saani May 25, 2011

    The plotter is hp designjet500.You mean i cld wash the printhead?Thank you

  • nima saani May 25, 2011

    i recently replaced the carriage belt of my hp designjet 500.The print
    quality is now very bad especially with the black ink.It does not print
    straight black lines.There is a kind of shadow print with white lines
    within.Thank you.
    Nima

  • nima saani May 26, 2011

    i cleaned it with running water.The ink seem to be flowing out easily.But it's still not giving good quality print.Is the process possible without ammonia.I don't have any presently.Thank you

  • nima saani May 26, 2011

    Hello Alpug,when iwent through through the process,the ink was flowing so freely with the distilled water.After putting it back,the print is still no any good.

  • nima saani May 27, 2011

    Hello Alpug,
    well,i got a new printhead and the printing is pretty good now,but the other is issue is,the plotter stops in a middle of printing.The carriage stops the service station and doesn't continue or sometimes complete the printing on the next page.

  • nima saani May 30, 2011

    Hello Alpug,
    I asked you a question about my plot stopping midway but you since not replied.Waiting to hear from you as soon as possible.Thank you

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  • 1,961 Answers

The printhead for black ink cartridge could be blocked.

It is better to run the Clean Printhead operation on your printers tools option.

You can manually clean the print head so that next time when you execute the Clean Printhead from HP solution center it will be successful.

First, remove the printheads.
then, pull up the lever at the top of the cartridge holder, this releases the print head.

The print head could be blocked, most common is the dried ink blocking the small holes in the print head.

Washed it in running tap water. It is best if you soak it in a mixture of water and ammonia and leave it overnight.

After soaking, you can spray it with canned air and blow those little holes to unclog it. Once it dry, return the print head and the ink cartridges and performed the alignment.

this video will show you how

Posted on May 25, 2011

  • Danilo Baraquiel
    Danilo Baraquiel May 25, 2011

    Hello Nima!

    First of all I want to apologize for giving you a wrong video of a different model because I thought it was officejet pro 8500.

    The answer to your question is yes! But not the whole part of the printhead, just the nozzle where ink flow out. The part at the bottom of the print head.

    Remove first the the black printhead. Examine the nozzle below it. You can place it under running water to unclog. Or leave the nozzle part soak on a mixture of ammonia and water solution to remove the dried ink.

  • Danilo Baraquiel
    Danilo Baraquiel May 26, 2011

    Using a mixture of ammonia and water is the last option to consider. If resources is not on you at this time, it is better to flush the printhead properly.

    flushing the printhead of the cartridge directly
    from the tap water ....Open your printer cover, remove the
    cartridge..place the printhead directly on a tap water running slowly.
    This will help flush the dried ink that clogged in the printhead. Turn
    the print head over, bottom side up until you see the ink flowed out
    from the printhead, do this until you see the a smooth flow of
    ink..(better result if the water is warm).. tap water contains residual
    minerals that can clog also the printhead..so it is advisable to final
    flush the printhead with a distilled water (it has no impurities) and
    dry it with cloth..

    As substitute to ammonia... soak the printhead portion of your cartridge in a
    hot distilled water, (please make sure that the
    contact point of the cartridge to the printer is not soak).. Place the
    printhead on the hot water and leave it there for about 4 to 5
    hours..move it on different location from time to time..After soaking,
    rinse it with distilled water and dry it with cloth...

    After doing the instructions, return back the cartridge to the printer and do the printhead alignment..

    Try printing a test page and see the outcome..

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I'll start by explaining some of the components you need to understand to troubleshoot the carriage system.

The Carriage is the thing the cartridges are mounted in, it slides on the carriage rail, the bushings in most newer carriages are made of plastic, (or maybe it would actually be called a polymer, or composite material). The bushings are the pieces that wrap around the carriage rail.

The carriage rail is a shiny round rod that the carriage rides on, it is driven across the rod by the carriage belt, by the carriage motor, at the opposite end of the belt there is an idler pulley, ".

In a HP printer the device where the carriage parks, (sits at), when the machine is not printing is called the service station, it is responsible for cleaning the print heads, and for capping the heads when you are not printing, (so they won't dry up). The bottom of the service station is the "Spittoon Base", ink is spayed into the base before printing to prime the heads, there is an absorbent pad in the base to soak up the ink. Note that the pad does not always soak up all the ink, so if you tilt an HP printer you can spill the ink out of the service station, (especially if it is a heavily used printer). The piece that moves back and forth in the service station is the "Sled", it was wipers to clean the heads on it, and the caps that keep the heads from drying out are also part of this assembly. The sled is moved back and forth before the carriage leaves the service statio to wipe the heads, this happens after the heads are primed, then the carriage is moved off the service station and the sled is again moved back and forth to clean the wipers.

The encoder strip is a plastic timing fence that looks clear at first glance, but has black lines painted on it. The strip is threaded through an optical sensor on the back of the carriage.

When the printer initializes the carriage has to leave the service station, or, if the machine was powered off when the carriage was somewhere else, whatever spot it is sitting in, and travel the way to the other side of the printer, and then return to it's home position which is the service station.

When the carriage reaches the side of the printer away from the service station it sets that as a reference, then it counts lines on the encoder strip as it travels home, if it doesn't see enough lines before it gets all the way to the other side and can't move any more then the printer decides the carriage must have something blocking it.

Sometimes a service station will fail in a way where the sled does not retract fully, if that failure happens when the carriage is parked then the carriage will usually not be able to leave the service station. If the service station binds when the carriage is off of the station, then the station may not be able to move all the way to that side, and will detect a carriage jam. When the service station binds you might hear a grinding noise as it's motor tries to drive the sled back and forth.

If the encoder strip is dirty the printer may not see all the lines and detect an error, often when the strip is dirty the carriage will move too fast and slam to one side of the printer.

I use water to clean the encoder strips in HP printers, water works well on water based inks, if your printer uses ink with another base you might use alcohol, but "ONLY" if the ink is not water based.

One end of the encoder strip is attached to a spring mount, if you wipe the strip starting at the end that is attached to the frame, and wipe only towards the spring mount, then the strip will stay attached to the printer.

A dry carriage rail will cause the carriage to bind, if the carriage does not move fast enough a carriage jam will be detected. Some newer HP printers use grease on the carriage rail, many models use a liquid lubricant, Use "ONLY" light synthetic or silicone based lubricants on printers that use a liquid lubricant, Petroleoum based products may melt the plastic bushings and ruin the carriage. (YES, Petroleoum based means WD-40)

some HP printers have a timing disc on the service station, and if the service station binds, or the timing sensor fails they report a carriage jam, but as far as I've seen that jam always occurs before the carriage moves.
You can use a synthetic lubricant on the carriage rail :hope this helps

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