HP QMS 4060 - Manual (Page 203)

Warranty
Considerations
B-21 Technical Specifications
rubber, wood, painted metal surfaces, and telephones are not accept-
able 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 anti-static wrist strap, discharge your body's
static electric charge by touching a grounded surface before you han-
dle any printer boards or components and before removing the con-
troller board cover. If you must walk around before completing your
task, discharge your body’s static electric charge again before touch-
ing the printer controller board.
Incidental and consequential damages caused by not discharging
electrostatic buildup can affect your printer warranty.
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