Terminating Resistors - Printronix L5535 Maintenance Manual

Chapter 6
Controller Module

Terminating Resistors

For parallel interface configurations, the printer is equipped with 470 ohm
pullup terminating resistors and 1K ohm pulldown terminating resistors on the
controller board. These are suitable for most applications. (See the figure on
the following page.)
If the standard terminating resistor packs are not compatible with the
particular interface driver requirements of the host computer, other values of
pullup and pulldown resistors might be required. Possible terminating resistor
combinations are:
Configuration
Factory Default
Alternate
Removal
1. Remove the controller board (page I–350).
2. Disconnect the ribbon cable connector from connector J15 on the
controller board to gain access to the IC sockets on the board behind the
ribbon cable.
3. Locate the terminating resistor packs. (See the figure on the following
page.)
4. Carefully remove the resistor packs from their sockets on the controller
board.
Installation
1. Carefully install the resistor packs in their correct sockets on the controller
board. Be sure to orient each resistor pack correctly. (See the figure on
the following page.)
2. Reconnect the ribbon cable connector to connector J15 on the controller
board.
3. Install the controller board (page I–350).
I–354
RP1 (Pullup & Pulldown)
470 ohm / 1K ohm
220 ohm / 330 ohm
RP2 (Pullup & Pulldown)
470 ohm / 1K ohm
220 ohm / 330 ohm