Safeworking Fax/Printers
There are a few models of printer in use over the sites

Epson WF-2630 - Ink Replacement Guide
Make sure you have your replacement cartridges handy before you begin. You must install new cartridges immediately after removing the old ones.
If an ink cartridge is expended, you see a message on the LCD screen. Note which cartridges need to be replaced and press the OK button, then press the up arrow button.
Turn on the printer.
If you are replacing a cartridge before you see a message on the LCD screen, press the up or down arrow button to select Setup and press the OK button. Then select Maintenance > Ink Cartridge(s) Replacement and press one of the Start buttons.
Lift up the scanner unit.
Squeeze the tab on the cartridge and lift the cartridge straight up to remove it.
Open the new cartridge packet.
Remove the yellow tape from the side of the cartridge
Do not remove any other labels or seals, or ink will leak.
Insert the new cartridge into the holder and push it down until it clicks into place.
Lower the scanner unit.
Press one of the Start buttons. The print head moves to its home position and the printer starts charging the ink. When you see a confirmation message on the screen, ink charging is finished

Brother Fax-2840 - Toner Replacement
Text Instructions
NOTE: Illustrations shown below are from representative product and may differ from your Brother machine.
Make sure that the machine is turned on.
Open the front cover
 
Take out the drum unit and toner cartridge assembly.
Hold your Brother machine with one hand and hold the drum unit with the other hand. Then, pull the drum unit toward you and lift it up.
 
 
Push down the green lock lever and take the toner cartridge out of the drum unit.
 
 
 
Unpack the new toner cartridge. Hold the cartridge level with both hands and gently shake it from side to side several times to spread the toner evenly inside the cartridge.
 
 
Pull off the protective cover.
 
 
Put the toner cartridge in the drum unit immediately after you have removed the protective cover. To prevent any degradation to the print quality, DO NOT touch the shaded parts shown in the illustrations.
 
 
Put the new toner cartridge firmly into the drum unit until you hear it lock into place. If you put it in properly, the green lock lever will lift automatically.
 
 
Make sure that you put in the toner cartridge properly or it may separate from the drum unit.
 
Clean the primary corona wire inside the drum unit by gently sliding the green tab from left to right and right to left several times.
 
 
Be sure to return the tab to the home position (1). If you do not, printed pages may have a vertical stripe.
 
Put the drum unit and toner cartridge assembly back into the machine. Close the front cover.
 

Canon FAX-JX210P - Ink Replacement Guide
Knowing When to Replace a FINE Cartridge
When Ink is Low :
When the ink level is low, the Ink Lamp lights up.
When Ink is Empty :
When the ink is almost empty, RECOMEND NEW CRT is displayed on the LCD and the Ink Lamp blinks. When this occurs it may not be possible to clearly print received faxes from memory. When the ink is empty, NO INK is displayed on the LCD. Printing will resume as soon as the FINE Cartridge is replaced.
Make sure the fax is turned on.
Open the Printer Cover until it locks into place securely at the second bump.
Remove the empty Cartridge.
Push down the FINE Cartridge (1).
Remove the FINE Cartridge (2).
Unpack a new FINE Cartridge.
Remove the protective tape (A). When doing so, DO NOT TOUCH the metallic areas.
Insert the FINE Cartridge
Insert the FINE Cartridge slightly slanted into the Cartridge Holder.
Push up the FINE Cartridge until it clicks into place.
DO NOT put the head of the FINE Cartridge downward into the Cartridge Holder.
Close the Printer Cover.