Can't change paper size from 4 X6 to Letter

[Mlzsailing]

Changed paper size to 4 X 6 to print pictures. Now can't change it back to Letter.

Keep getting message "Paper size mis-match". When I try to change paper size, do not have option.

[ReverseTalk]

Is letter-sized paper loaded in the input tray, and are all other papers (envelopes, photo papter, etc) removed?

Here are the steps to resolve the issue: 

HP Printers - 'Paper Mismatch' Error (Mac)

Step 1: Adjust the paper size setting

Check the paper size setting to make sure it matches the paper you want to print.

   NOTE:

Some printers have an option to ignore the error and continue printing. If you choose to ignore the error, the margins on your printout might not be proportional to the edges of the paper.

1. In the application you want to print from, click File, and then click Print.
2. Select your printer from the Printer drop-down list.
3. Click Paper Size.
   Figure : Selecting the correct paper size in the Print menu

   
4. Select the paper size that matches the size and type of paper loaded in the printer tray, and then click OK. If there are no matching paper sizes, select the size from the list that is closest to the size of the paper loaded in the tray.

      NOTE:

   Depending on the software application, Paper Size might not display in the Print options. Click File, and then select Page Setup from the menu.

   Figure : Selecting the correct paper size in the Page Setup menu

   

5. Try to print.

If the issue persists, continue to the next step.

Step 2: Reset the printer

Reset the printer to clear any hardware issues or error states.

1. Turn the printer on, if it is not already on.
2. Wait until the printer is idle and silent before you continue.
3. With the printer turned on, disconnect the power cord from the rear of the printer.
4. Unplug the power cord from the wall outlet.
5. Wait at least 60 seconds.
6. Plug the power cord back into the wall outlet.

      NOTE:

   HP recommends connecting the printer power cord directly to the wall outlet.

7. Reconnect the power cord to the rear of the printer.
8. Turn on the printer, if it does not automatically turn on.
   The printer might go through a warm-up period. The printer lights might flash, and the carriage might move.
9. Wait until the warm-up period finishes and your printer is idle and silent before you proceed.

If the issue persists, continue to the next step.

Step 3: Update the driver

AirPrint drivers might not support printing on different paper sizes. To update the driver, remove your printer from the printer list, and then add the printer with the HP print driver.

Video of updating the printer driver

View this video on YouTube.

1. Click the Apple menu, and then click System Preferences.
2. Depending on your operating system version, click Print & Fax, Print & Scan, or Printers & Scanners.
   Figure : Example of the Printers & Scanners window

   
3. Click the name of your printer, click the minus sign , and then delete the printer.
4. Click the plus sign , and then click Add Printer or Scanner.
5. Click the Use or Print Using box, and then select the name of your printer in the pop-up menu.

      NOTE:

   If your printer does not display in the Print Using or Use list, go to 123.hp.com to get the most current driver.

   Figure : Selecting the name of your printer in the Use menu

   
6. Click Add to add the printer to the list.
7. Restart the Mac.
8. Try to print.

If the issue persists, continue to the next step.

Step 4: Check the paper source setting

Remove and reload the paper in the input trays, and then check the paper source setting.

1. Remove all the paper from all the printer input trays.
2. Reload the paper, and then adjust the paper width guides so they gently rest against the edge of the paper stack.
3. In the program you want to print from, click File, and then click Print.

      NOTE:

   If your printer only has one paper tray, skip to the step to Update the firmware. You do not need to select a paper source in the printer settings.

4. Select your printer from the Printer drop-down list.
5. Select the Paper Type/Quality or Media & Quality menu.
6. Click Feed from or Source to select the correct paper tray.
7. Try to print.

If the issue persists, continue to the next step.

Step 5: Update the firmware

If you recently upgraded your operating system, you might need to update the firmware to repair certain printer functions.

Windows

Mac

[MuthuSarkan]

Hi

Try this steps

1- control panel

2- Device and Printers

3- right click on your printer

4- Printer properties

5- Device settings

6- change tray 1 to A4 and change manuale feed to A4 insted of Letter 

[Nee2]

Hi,

This document should help -

https://support.hp.com/in-en/product/hp-officejet-pro-6960-all-in-one-printer-series/8289579/documen...

Regards,

Neetu

[ShlomiL]

Hi,

Please also ensure the printer is setup correctly by openning and closing the input paper tray, then evaluate the shown prompt.

If it shown 6 x 4 press Modify and change the Size to Letter, as well be sure to set the Paper Type as Plain Paper.

Shlomi