Power up a Xerox 8860 MFP printer

Maybe try this, it woks on Sagem that also produces xerox mfp...

Follow the keystrokes set out below, do not worry about what is on the display unless stated to check. All letters referred to are for the keys on the alpha key pad to the right of the control panel, under the plastic flap.

1st option: Press down arrow, *, #, ok, 1, ok, stop (red button),
Press down arrow, #, T.
The machine returns to the error code. Switch the machine off for 10 seconds, switch
back on. If successful the machine will warm up and come ready.
Press down arrow, *, #, 0 (ZERO), ok, stop.

2nd option
Press down arrow, *, #, ok, 1, ok, stop.
Press down arrow, #, look on the display, press up arrow until "T>>PRINTER" is
displayed. Press ok. The machine returns to the error code. Switch the machine off for 10
seconds, switch it back on. If successful the machine will warm up and come ready.
Press down arrow, *, #, ok, 0 (ZERO), ok, stop.
If this is a recurring problem the firmware on the board may need to be upgraded, or there
is a physical fault with the fuser unit. Low voltage / power surges in the supply power to
the machine may also play a part in the occurrence of the error.
The firmware needs to be version 1.10.

To check the firmware version do the following:
Press down arrow, *, #, ok, 1, ok, stop.
Press down arrow, *, W
Firmware version is displayed. Press stop to clear screen.
Press down arrow, *, #, ok, 0 (ZERO), ok, stop.
5401:
Press down arrow, *, #, ok, 1, ok, stop
Press *
The trace lists will be printed, firmware version is after PRT, as in example below.
In this example, the printer firmware is: PRT V 1.5
It is older than V 1.10 and the printer firmware need to be upgraded.njk

Fax machines usually only work over regular phone lines, not through digital cable or DSL systems. If your phone is a VOIP phone, it is a digital system and your fax will not work. It needs to be plugged into the Plain Old Telephone System (POTS) which is an analog system.

I would first try to inspect and possibly replace the ram. On the back of the machine there are two thumb screws holding on a metal plate. Remove the two screws to access the ram. You can remove the ram and try the second ram slot if it is unused. (check the video at 2:45 to see what this looks like) If after replacing the ram and trying both ram slots the error continues you most likely need to replace the Electronics module (MFP part# 084K36560, non-mfp part# 084K36550). Here is a video that shows you how to replace that part. (video is of a 8500 non-mfp version so it is a little different but still similar). Good luck, and thanks for using FixYa!

The default password is "00000" If this password does not work you can follow the following to reset it:

1. Power OFF the machine using the power switch located on the right side of the machine, toward the back. Press the power switch to the (O) position.
   
   
2. Press and hold the [OK] button on the Control Panel.
3. Continue to hold the [OK] button and power ON the machine. Keep the [OK] button held down until the Ready screen is displayed. The password is now reset to the default Control Panel password, which is 00000.
   
   NOTE: There will be no confirmation message during or after the machine's power on sequence. However, if the procedure was performed correctly, the password has been reset.

12 codes on that machine mean a software error.
You can try removing and reseating the RAM chips , most likely its corrupted and will require a software install. The software ( Firmware) would be found at xeox.com, Click on drivers and downloads, then type in 8860 in the search box then click to drivers and downloads again and scroll down to firmware.

General Troubleshooting
Product Will Not Turn On
Cannot Print the Configuration Page
Probable Causes Solutions
The power cord is not correctly plugged into the
outlet.
Turn off the product, confirm that the power
cord is correctly plugged into the outlet, and
then turn on the product.
Something is wrong with the outlet connected to the
product.
Plug another electrical appliance into the
outlet and see whether it operates properly.
The power switch is not correctly turned on (I
position).
Turn the power switch off (O position), then
turn it back to the on (I position).
The product is connected to an outlet with a voltage
or frequency that does not match the product
specifications.
Use a power source with the specifications
listed in Electrical Safety on page 1-2.
Probable Causes Solutions
The tray is empty. Check that at least Tray 1 is loaded with
media, in place, and secure.
The product’s covers aren’t closed securely. Make sure the covers are closed securely.
Close all covers gently to avoid jarring the
product.
There is a paper jam. Clear the paper jam.
Driver Problems
With Pages/Sheet on Multiple Copies, the Output Is Incorrect
Booklet Left and Right Binding Output Is Incorrect
Probable Causes Solutions
Did you set the correct date and time? Ensure you have set the correct Date and
Time on the control panel, through
CentreWare IS or the MCC.
The backup battery has reached the end of its
service life.
Replace the backup battery.
Probable Causes Solutions
Media or settings are not correct. Make sure the duplex unit is installed and
enabled in the product driver.
Make sure that you are using correct media.
See Supported Paper and Media on page 6-2.
Do not duplex custom-sized media, envelopes,
labels, postcards, thick stock, or
transparencies.
Make sure that you have not mixed media
types in Tray 1.
In the product driver choose "Print on Both
Sides".
Probable Causes Solutions
Both the driver and the application have been set to
Collate.
For Pages/Sheet on multiple copies, choose
Collate only in the driver’s Basic tab. Do not
set collation in the application.
Probable Causes Solutions
Both the driver and the application have been set to
Collate.
For Booklet Left Binding and Booklet Right
Binding, choose Collate only in the product
driver’s Basic tab.
Do not set collation in the application.

Status Messages
Message Definition Solutions
CANCELLING JOB The job is being cancelled. No action needed.
*ENERGY SAVE* The machine is in Energy Saver
mode to reduce power
consumption during periods of
inactivity.
*PLEASE WAIT!* After replacing a toner cartridge,
or after rebooting your machine
after environmental changes,
your machine automatically
pauses to do an Auto-Image
Density Control (AIDC) cycle.
This process is provided to make
reliable machine operation with
optimum output quality possible.
The machine is warming up.

Before attempting to resolve the error 133. -290, print a copy of the configuration report on the copier / fax. Use the navigation on the front panel to access the configuration menu to get the impression. Review printing to make sure it understands the network settings. This is a protection against configuration settings being lost when you troubleshoot.
Clearing Memory reset the memory of the Xerox Phaser 6180MFP, Dell 3110cn or Dell Machine 3115cn to erase the stored contents and eliminate corrupted data. Disconnect the analog line and power cord from the printer. Wait at least 10 minutes. Then reconnect the analog line and the power cord. As the machine starts, press the "All Clear" "Stop" buttons to prevent automatic printing of the status page. Check the error display panel 133 to 290 times the machine is fully initialized.
Corrupt Adjustmen

Sounds more like an NVRAM issue.

Gotta be a setting on the machine. Set this to say A4 and make sure the same is set in your print dialogue box