Printronix L5020 ユーザーズマニュアル

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Termination Resistors
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Termination Resistors
For parallel interface configurations, the printer is equipped with 
470 ohm pullup and 1K pulldown terminating resistors located on 
the printer motherboard.
Generally, these terminating resistors are suitable for most 
applications. If, however, the standard terminating resistor pack is 
not compatible with the particular interface driver requirements of 
your host computer, other values or combinations of pullup/
pulldown resistors may be necessary. For example, the 
Dataproducts interface and some host computers require the use of 
220 ohm pullup and 330 ohm pulldown resistors.
If you are experiencing communication problems between the 
printer and host (double or missing characters), the cause may be 
the value of the termination resistors on the motherboard. Contact 
your authorized service representative for instructions on replacing 
the termination resistors.