20 Most Recent HP DesignJet 750c InkJet Printer Questions & Answers

you may want to try a different paper profile - when loading the roll choose a different paper type alternatively you may need to calibrate the paper advance ( use service manual to complete this step)

check to see if the belt that you changed was reinstalled correctlywith the proper tension because if the belt is too tight or too loosethese simptoms may be the result of poor adjustment.you needjust a small amount of play in that belt where you can take your index finger and softly poke the belt which should have a smallamount of play.go over what you did so that you can find where you have went astray

disable pen check option thru Front Panel Menu Button
it will not check the cartridges & not service the cartridge

first, print a self test, if it is not printed, you may have a problem in your carriage, replace it

Hi,
Your drop detector is faulty. This checks the black cartrige for correct firing. You will need to replace your entire service station. Part Number from a parts supplier in Germany will be C3195-60165. Fitting is straight forward if you have the technical ability. The station is in the left cover, remove the cover and simply remove and replace the station, no resets are required.

Sounds like it can not find home. Is there a limit switch? If not there may be a failure in the counter from the stepper motor.

Yes, I had the problem a week ago, it was a "Doooh" moment when I figured it out.
Your cutter is not where it is supposed to be. It should be OUTSIDE of the metal strip, and you almost certainly have it running in the groove on the inside. THe cutter wheel should have almost 1/2" overlap with the overdrive blade.

As the service manual says on reinstalling it "Ensure the cutter is over the overdrive blade".

I must have looked at it 10 times before it registered. THere is even a drawing. Not a clear one, until after you realize what is wrong.

The 070020 error means:

"One of the Drop Detection errors has occured - or, during the Drop Detection no drop was detected.

Pen checking is set to OFF.

* Perform the drop detect calibration,
* Troubleshoot the catridges and the drop detector.

* If required, replaced the service station, .

* Check the cable assembly and the main PCA.

check the catridges thier must be a mixing up of color when you were refilling the catridges

79 errors are usually bad firmware that needs replaced or updated. Sometimes it is simply a bad print job being sent. Check to see if only one print job is causing this error, or if it happens with everything you try to print.