Resistors, Terminating - Printronix SLPA7000 User Manual

Resistors, Terminating

For parallel interface configurations, the printer is equipped with 470 Ohm
pull-up terminating resistors and 1K Ohm pull-down terminating resistors on
the controller board. These are suitable for most applications. (See Figure 44
on page 254.)
If the standard terminating resistor pack is not compatible with the particular
interface driver requirements of the host computer, other values of pull-up and
pull-down resistors may be required. 220 Ohm pull-up and 330 Ohm pull-
down alternate terminating resistors are provided with the printer. 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 below.
Configuration
Factory Default
Alternate 1
Alternate 2
Removal
CAUTION
To prevent electrostatic damage to electronic components, always wear
a properly grounded static wrist strap when you handle circuit boards.
1. Prepare the printer for maintenance (page 223).
2. Locate the terminating resistor packs. (Figure 44, page 254.)
3. Using a chip puller, remove the packs.
Installation
CAUTION
To prevent electrostatic damage to electronic components, always wear
a properly grounded static wrist strap when you handle circuit boards.
1. Using a chip installation tool, install the resistor packs in the correct
socket. (Figure 44, page 254.)
2. Restore the printer to operation (page 224).

Resistors, Terminating

RP2 (Pull-Up)
470 Ohm
220 Ohm
1K Ohm
RP1 (Pull-Down)
1K Ohm
330 Ohm
None
253