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It's very important to protect the printer controller board and other printer circuit boards
from electrostatic damage.
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 any convenient electrical ground. The bare metal
chassis of equipment, such as on the back of a computer, is suitable if it is plugged in
but turned off. Never attach the wrist strap to any piece of equipment with an
electrical current present. Turn off all power switches first. Plastic, rubber, wood,
painted metal surfaces, and telephones are not acceptable grounding points. The
printer isn't an acceptable grounding point either because it must be unplugged before
you perform this task.
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 and before removing the controller board cover. If you must walk around
before completing your task, discharge your body’s static electric charge again before
touching the printer controller board.
Incidental and consequential damages caused by not discharging electrostatic
buildup can affect your printer warranty.