Instruction manual

5–35
Replacement Procedures and
Illustrated Parts List
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 5–5.)
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 470 ohm
220 ohm
1K ohm
RP1 (Pull–UP) RP2 (Pull–Down)
Alternate 1
Alternate 2 1K ohm
330 ohm
none
Removal
CAUTION
To prevent electrostatic damage to electronic components, wear a
properly grounded static wrist strap when you handle circuit boards.
1. Remove the paper path (page 5–29).
2. Locate the terminating resistor packs. (See Figure 5–5.)
3. Using a chip puller, remove the packs.
Installation
CAUTION
To prevent electrostatic damage to electronic components, 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. (See Figure 5–5.)
2. Install the paper path (page 5–29).
3. Return the printer to normal operation (page 4–3).