Alternate Terminating Resistors; Removal And Installation - Printronix P9212 Setup Manual

Alternate Terminating Resistors

The factory equips the printer with 470 ohm pull-up and 1K ohm pull-down
terminating resistors, located at coordinates 12C and 12D respectively on the
Common Controller Board (CCB). These resistors are used for parallel
interface configurations and are suitable for most applications.
If the values of these terminating resistors are not compatible with the
particular interface driver requirements of your host computer, other values
of pull-up and pull-down resistors might be required
Accordingly, the shipping kit for this printer also includes 220 ohm pull-up
and 330 ohm pull-down alternate terminating resistors. If you install the
220 ohm pull-up resistor, you must also install the 330 ohm pull-down
resistor. Possible terminating resistor combinations are shown in the table
below:
Pull-up at 12C
Pull-down at 12D

Removal and Installation

This is an involved maintenance procedure and should be performed
only by a trained technician.
The Common Controller Board (CCB) must be removed from the card cage
in order to remove or install terminating resistors.
The procedures for removing and installing the CCB and terminating
resistors are in the Maintenance Manual.
Printer Interfaces
470 ohm 220 ohm
1K ohm 330 ohm
IMPORTANT
1K ohm
none
4–9