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

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

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Computer Hardware
Whenever you have a hardware resource conflict, it will more likely be an IRQ conflict rather than an i/o conflict because:

there are a lot more I/O addresses than IRQs.
I/O addresses cannot conflict
software tends to correct I/O conflicts
the BIOS sometimes has more of a problem controlling IRQs
software tends to mess up IRQs

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