ALLEN-BRADLEY
Bulletin 2755 Liquid Crystal Display
(Catalog No. 2755-NR1)
Installation Data
This document shows how to install the Catalog No. 2755-NR1 Liquid
Crystal Display (LCD) in the 2755-DSxx 1 and 2755-DDxx 1 Bar
Code Decoders.
WARNING:
!
!
Remove power from decoder before installing the Liquid
Crystal Display (LCD). Failure to do so could result in
personal injury and damage the LCD.
CAUTION:
ESD (Electrostatic Discharge) may cause damage to electronic
equipment. Take standard precautions to minimize the possibility
of an electrostatic discharge when installing the LCD Display.
Refer to Figure 1 during installation. To install the LCD Display:
1. Remove AC power from decoder.
2. Loosen the two cover screws and open decoder cover.
3. Remove the insert that covers the LCD Display window. Locate the four
#4-40 standoffs on the inside of the cover. The window insert is to the
left of these standoffs. Pull the insert out to the left until completely
removed and the window is exposed.
4. Locate the plastic cable clip supplied with the LCD Display. Peel the
backing off the clip to expose the adhesive. Adhere the clip to the inside
of the cover as shown in Figure 1.
5. Carefully remove the LCD Display from its package so as not to press on
the surface of the display or damage the cable. Remove protective clear
plastic from front of display.
6. Position the LCD Display face down aligning the four holes with the
standoffs in the cover. The wide cable and connector should face the
circuitry inside the decoder.
1
40062-231-01(A)
Catalog numbers are incomplete. The 2755-DS and -DD decoders are available in different configurations.
Installation Data
Bulletin 2755 Liquid Crystal Display
7. Attach the LCD Display to the inside of the decoder cover using the
#4-40 screws supplied. Tighten screws to a torque of 6 ±1 in-lbs.
8. Plug the wide strip connector into the connector marked CON8 LCD
DISPLAY on the decoder logic board. Press firmly to seat connector.
9. With the tab facing the outer wall of the enclosure, plug the 2 wire
connector into the connector marked CON14 LCD BACKLIGHT on the
logic board. Failure to do this will damage the backlight or cause it
not to operate.
10. Place the 2 wires in the plastic clip installed earlier. This will prevent the
wires from being cut or damaged when the cover is closed.
11. If you cannot read the display when the decoder is powered on, open the
decoder cover and adjust the contrast of the display by turning the
contrast adjust potentiometer located on the logic board.
Figure 1
LCD Display Contrast Adjust
CON14 LCD Backlight
Plastic Cable Clip
CON8 LCD Display
#4-40 Mtg. Screws (4)
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LCD Display
LED Board
1992 Allen-Bradley Company, Inc.
ALLEN–BRADLEY
A ROCKWELL INTERNATIONAL COMPANY
Milwaukee, Wisconsin 53204
PRINTED IN USA