How do I reset dcp-8045d hex dump mode

The OEM number from Brother is TN540 for a standard cartridge and TN570 for a high yield cartridge (more toner)

Check out that the Scanner USB cable is connected to the PC apart from the printer Cable

Video Mode
Press the MODE button to select the Video mode.
Note: The camera has limited internal memory allowing you to record up to 20 seconds in QVGA. An SD
card (up to 8GB) needs to be inserted in order to use the video mode normally.

When the icon appears on the top left corner of the LCD screen this indicates that you are in Video
mode.

1. Prepare the object or subject you wish to record.
2. Press the Shutter button to begin shooting the video.
3. The elapse time will appear on the top right of the LCD screen and the icon will flash on the
LCD screen.
4. Press the Shutter button again to stop the recording and save this file in AVI format.

Note:
1. You can preview the AVI files in Playback mode or once downloaded to your computer by using
Quick Time and Windows Media Player.
2. When the camera's memory is full, the “Memory Full Insert a SD Memory Card to Transfer and
Shoot More video!” message will appear on the LCD screen when you attempt shoot more videos.
Download the test file from the internal memory to the PC or delete them to shoot more videos.
27
Alternatively, you can insert a SD memory card to expand the memory to record longer videos.
3. The LED will light up when the light condition is not good.

I resolved the " Hex Dump Mode" problem
Step1: switch off power
Step2: press and hold Stop/Exit ( Red Color Key ) switch on power supply .......
now no " Hex Dump Mode" problem

This error is a fuser error. It can be reset, but usually the fuser has to be replaced.

Hex dump mode is mostly used for trouble shooting of the printer. To exit the hex dump mode, enter the Diagnostics menu / Hex
Dump Mode and select ‘Disable’. Exit the menu, save changes and
return to the ‘READY’ mode.

I do on Mac,  any use?

are you on Mac or PC.  I know h2 do it on Mac

Broken left hinge stopping doc cover switch in left corner activating
Here is link to purchase one for $25 bucks, three screws and job done, easy fix!

Reset
Defaults
Prog.mode
Hex 1
Hex 7
Hex 1
Hex 1
Hex 0
Save & Reset