Computer Hardware
An important first step in troubleshooting which component in a laser printer is causing a jam is to:

check all voltages
note where in the paper path the paper stops
remove the jammed paper
look up error codes
turn the printer off, then on again

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Computer Hardware
ESD damage can be caused by:

None of these
Touching metal on the chasis
Placing an IC in a non-conductive plastic bag
Placing an IC on a grounded mat
Repeated sags in current supplied from outlets

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