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Alternate Terminating Resistors
For parallel interface configurations, the printer is equipped with 1K ohm pullup terminating
resistors located at U1 and U3 of the I/O cable assembly PCBA. Generally, the 1K ohm termi
nating resistors are suitable for most applications. If, however, the standard terminating resis
tor pack is not compatible with the particular interface driver requirements of the host, 220
ohm pullup and 330 ohm pulldown alternate terminating resistors are provided. Printronix rec
ommends using the 330 ohm pulldown resistors in conjunction with the 220 ohm pullup resis
tors.
Floor Cabinet Model
To install the alternate terminating resistors in the floor cabinet model, perform the following
instructions.
1.
Turn off the printer and disconnect the ac power cord.
2.
Remove the six screws securing the I/O panel at the lower rear corner of the printer as
shown in Figure 7-1.
3.
Slide the entire I/O assembly straight out of the printer until the I/O PCBA is accessible.
4.
Remove the 1K ohm resistor packs from the sockets at locations U1 and U3 on the I/O
PCBA as shown in Figure 7-1.
5.
Plug the 220 ohm resistor pack into the socket at locations U1.
6.
Plug the 330 ohm resistor pack into the socket at U2.
7.
Slide the I/O assembly back into the printer.
8.
Replace the I/O panel and secure it with the six screws.
9.
Reconnect the ac power cord and turn the printer on.
7-8
Interfaces
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