Johnson Controls Frick QUANTUM Series Maintenance Manual page 28

090.560-M (APRIL 13)
Page 28
DESCRIPTION
The Quantum™ LX Operator Interface actually consists of
two components: A color 10-1/2" (diagonally measured)
graphic display and a membrane touch keypad. The dis-
play is used to view information coming from the Quan-
tum™ controller, while the keypad allows the user to en-
ter information into the controller.
DISPLAY ASSEMBLY
The Display assembly consists of a 640 x 480 resolution,
LCD or LED screen (which includes a fl uorescent or LED
backlight tube(s), an optional backlight inverter circuit
board, and a wiring harness). Refer to the Parts Lists ear-
lier in this manual for part numbers.
NOTE: Before replacing a display unit, ensure that the
symptom is not actually being caused by a bad fl uo-
rescent (or LED) tube, optional inverter or harness.
IDENTIFYING THE TYPE OF DISPLAY
Various display manufacturers have been utilized over the
years, and although the variations between the displays
of these manufacturers is subtle, it needs to be addressed
here. If a display related problem is ever encountered and
factory service is contacted, they may request the type
of display that is being diagnosed. This information can
be found on a sticker located on the back of the display
mounting plate, and should resemble the following ex-
ample (the example shown is for reference only):
SHARP DISPLAY ASSEMBLY
ORDER 639C0230G01
- INCLUDES DISPLAY, MOUNTING
PLATE & DUAL BULB INVERTER
This sticker will give the part number of the display that is
currently installed. Refer to the Spare Parts list at the end
of this manual for applicable part numbers.
NOTE: In the past, CCFL style displays had been used.
These displays can be identifi ed by an inverter circuit
board mounted next to the display. This board took the
low voltage signal from the Q4/Q5, and stepped the volt-
age up to drive a fl uorescent tube inside the display to
illuminate the display screen. Currently, LED style displays
are being used. These displays can be identifi ed by the
lack of the external inverter board as mentioned before.
The voltage from the Q4/Q5 board is used to directly drive
an internal LED light stick within the display to light the
screen. It is important to verify the jumper settings on
both the Q4 and Q5 to ensure that they are set appropri-
ately for the type of display being used. Refer to the charts
on the following page.
QUANTUM™ LX CONDENSER/VESSEL CONTROL PANEL
MAINTENANCE
OPERATOR INTERFACE
DISPLAY REPLACEMENT
NOTE: For a Q5 controller, when ordering a replacement
display, please check for CPU BIOS version 1.13 (view the
ABOUT screen). Contact Frick ECS for BIOS upgrade.
1. Shut off control power.
2. Carefully unplug all connectors that are attached to
the display. Ensure that you are familiar with the re-
location of each of these connectors.
3. Loosen the four hex nuts located on the display plate.
The location of these nuts is shown on the Q4 and Q5
Display Mounting Plate drawings.
4. While supporting the display plate assembly with one
hand, carefully remove the four hex nuts that were
loosened in the previous step.
5. Once the four nuts have been removed, carefully re-
move the display plate. There is a section of plexiglas
between the display and the clear viewing window of
the keypad assembly. Ensure that this plexiglas does
not come out. If it does come out, simply ensure
that it is reinstalled before placing the new display
in place. Also be sure not to get fi ngerprints on the
plexiglas.
6. Carefully lay the display plate down on a table or
bench, with the display side up.
7. If you haven't already done so, remove the connector
from the back of the display. There are two varia-
tions on the way the display connector is attached
depending on whether the unit is a Q4 or Q5. Please
refer to the notes provided later in this section as to
how to properly perform the cable removal.
8. Remove the four phillips head screws located near
the corners of the display.
9. Remove the defective display.
10. Install the new display.
11. Reinstall the four phillips head screws near the four
corners of the display. Do not overtighten.
12. Reconnect the display connector on the back of the
display. Once again, refer to the two sections shown
later as to the proper method to do this.
13. Reinstall the display plate back into position on the
panel door, and loosely reinstall the four hex nuts, do
not tighten yet.
14. Look at the front of the display from the front of the
panel door. Ensure that the display looks centered in
the display opening. Once centered, tighten the four
hex nuts. Re-centering the display may be necessary
after these steps have been completed. If this is the
case, simply loosen these four nuts, and re-center
the display, then retighten.
15. Reattach all of the connectors that were removed
during step 2.
16. For a Q4 board, verify the jumpers (link) settings per
the tables as shown later in this section. For a Q5
board, verify the Q5 board jumpers, as well as the
Interface board jumpers that are shown in Section 2
of this manual.