T2600dr cutter tears paper because of paper loop

[i-have-fax-problems]

I have a problem with with a T2600dr. Very often (not generally) the paper which has to be cut gets a loop over the whole width and the edge is to high up for being cut, (see pictures - paper loop on the left side and cutter on the right) which leads to tearing the paper when the cutter shall cut it.

I've calibrated the paper feed and firmware is from March 2025.

There is some problem with the paper transport I guess. But it's not always. I don't believe there is something in the paper path.

Can anyone help? Thank you.

[Kiran Otter]

Check that the starwheel motor and gear assembly is working as it should. If not, replace it. CR357-67086

Kiran

[i-have-fax-problems]

Check that the starwheel motor and gear assembly is working as it should. If not, replace it. CR357-67086

Kiran

Thank you. I've called the HP Support and we changed paper exit from staple unit to net on the bottom to see if the problem persist. Can I print a error log report with the error code somewhere? Or see it on the Panel?

[Kiran Otter]

I would expect it to still have the same problem regardless of the output change. Yes, from the front panel menu you can print the service information pages. It's unlikely to give you any more insight to the problem unfortunately. I rarely ever find them useful. You can also print them from the web interface, I believe.

Kiran

[Kiran Otter]

I made a mistake about the starwheel motor assembly. I'll see what HP says about the issue with the cutter. I believe it's the 'auto pinch lifter assembly' but I want to make sure.

Kiran

[Kiran Otter]

Okay, I was on the right track. There is a starwheel motor, CR357-67010. There is a diagnostic for the starwheel motor and sensors, I would run that and watch for the starwheel assembly to raise and lower evenly. If you hear a grinding noise, the motor needs to be replaced. The important thing is that it is level, and not being raised on the left and not the right. You can remove the starwheel assembly and start the printer (don't print,) and observe the lifters for the starwheel assembly. I suspect the assembly is raised and not lowering like it should, which prevents the printer from being able to move the paper backwards.

Btw, changing the output to the basket would only troubleshoot issues with the stacker.

Also run the diagnostic on the rewinder motor. Make sure the paper on the roll cannot turn independent of the spindle. If there's not enough friction the printer can't maintain the tension needed and might be the cause of the hump in the paper. If you can twist the spindle in the roll easily, add some tape around the spindle end that inserts into the roll to give it more grip. Usually this condition will cause the printer to think it has reached the end of the roll and eject the paper for seemingly no reason.

Kiran

[i-have-fax-problems]

Okay, I was on the right track. There is a starwheel motor, CR357-67010. There is a diagnostic for the starwheel motor and sensors, I would run that and watch for the starwheel assembly to raise and lower evenly. If you hear a grinding noise, the motor needs to be replaced. The important thing is that it is level, and not being raised on the left and not the right. You can remove the starwheel assembly and start the printer (don't print,) and observe the lifters for the starwheel assembly. I suspect the assembly is raised and not lowering like it should, which prevents the printer from being able to move the paper backwards.

Btw, changing the output to the basket would only troubleshoot issues with the stacker.

Also run the diagnostic on the rewinder motor. Make sure the paper on the roll cannot turn independent of the spindle. If there's not enough friction the printer can't maintain the tension needed and might be the cause of the hump in the paper. If you can twist the spindle in the roll easily, add some tape around the spindle end that inserts into the roll to give it more grip. Usually this condition will cause the printer to think it has reached the end of the roll and eject the paper for seemingly no reason.

Kiran

Thank you. Hp Support told me there is a known issue with the stacker, which may cause this problem. The printer even once teared a paper while printing (not when cutting). See picture.
The print carriage destroyed it. Unfortunately i removed it and then took the picture. But reason must have been the hump again.

[Kiran Otter]

I PMed you with more info but I'll post the solution here for others who come across this. There is a flaw in the stacker HP identified with a certain range of serial numbers, which keeps the media from entering the stacker completely. There is a kit 3EK10-67008 that contains the parts to replace in the stacker. There was also an option of physically cutting the hooks in the stacker but without being able to share the internal newsletter from HP, I don't recommend this. Maybe when you talk to HP they can share it with you directly.

Kiran