Konica Minolta bizhub C20X - Manual (Page 315)

Antistatic Protection 301
Antistatic Protection
Note
It’s very important to protect the printer controller board from
electrostatic damage while performing any task involving the controller
board.
Turn off all power switches first. If an antistatic wrist strap is provided in
your printer option kit, attach one end of it to your wrist and the other
end to the bare metal chassis on the back of your printer. Never attach
the wrist strap to any piece of equipment with an electrical current
present. Plastic, rubber, wood, painted metal surfaces, and telephones
are not acceptable grounding points.
If you don’t have an antistatic wrist strap, discharge your body’s static
electric charge by touching a grounded surface before you handle any
printer boards or components. Also avoid walking around after
grounding yourself.