How do you reset toner counter on phaser 7750? Thanks

Included general maintenance video and how to clear smears from the paper.

Solution: Remove Print Smears / Printing Fuser Cleaning Pages
7750 Support Knowledge Base Remove Print Smears Fuser Cleaning...

With Troublshooting highlighted on the printer display perform the following steps:

1. Press OK.
2. Press the Down Arrow and scroll to Print Quality Problems.
3. Press OK.
4. Press the Down Arrow and scroll to Remove Print Smears.
5. Press OK. The printer will print 5 cleaning pages.

Repeat this process five or six times, to remove stubborn toner buildup from the fuser.
Always make sure you are matching the type of paper loaded in the printer tray(s) to the correct Paper Type front panel setting. When you load a tray with paper, the front panel will ask you to indicate the type of paper you loaded. For correct print quality and printer operation, be sure to set this correctly.
MAINTENANCE:
Phaser 7750 Video Instruction Maintenance for the Printer Phaser

It sounds like one of the cover or tray sensors is not working correctly. Check the actuator on the fuser cover, sometimes these break off so the printer thinks the cover is still open. If that seems ok and you have a lower tray deck unplug it to eliminate them as the cause.

Not yet, check with the supplier and ask if it is compatible with the 7750, if not then exchange the 7760 for a 7750 yellow toner cartridge. Once you open the cartridge the supplier will not exchange.

Not that I know of. Did you receive a chip with the toner? If not that chip would need replaced to reset the counter;

try to hold down the on/reset button a few seconds when you power it up ...on most printers this resets them ..about 10 sec it is enough ...

Hello there :
in the main menue of the printer there is a option that lets you reset it to zero but if this is a buisness printer you might have to have the company come and set it for you cause theire somtimes is a code that is entered to get to the main menue

Error codes 7-401 to 7-404 are life end for the tray rollers. If no jamming probs then enter diags mode (Back and'i' buttons and switch on) scroll down to NVRAM access and select. find CRU counters and select, clear each tray counter and then exit.

Reset the Tray 2 feed counter within Service Diagnostics as follows:
1. Enter Service Diagnostics (back arrow botton with the "i" button soon as you turn it on) and scroll to NVRAM Access and press OK
2. Scroll to Reset CRU Life Counters and press OK. The display will show the status of all CRUs. Press OK until the Reset Counters menu is displayed.
3. in the Reset Counters menu select Yes and press OK.
4. Scroll to Tray 2 and press OK.
5. Exit diagnostics.

That's what worked for me I called a company called Iteminc they gave me the instructions and they told me to :Replace the tray 2 pick, feed and separate rollers before it starts jamming soon. www.iteminc.com is their website good luck give them a call if it does not work.

did you shake the toner really well first? sometimes this fixes on this machine.

Most likely the cartridge has its own chip that is not resetable.