Printronix P8000 Plus Series Administrator's Manual page 189

Heavy Forms (6H, 8H, and OpenPrint HD Shuttles only)
Can improve print quality and maintain top of form on certain thick or heavy media.
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Disable (factory default). The printer slews normally
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Heavy 1, 2, 3, 4, 5. Increasing the Heavy number increasingly slows certain movements to maintain
top of form with heavy media.
NOTE: The heavy settings may slow throughput.
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