QUANTUM
™
LX EVAPORATOR CONTROL PANEL
MAINTENANCE
090.610-M (MAY 2016)
Page 25
7. Check the display. If the Q4 board is booting but
you have no display, check the following:
• Check the backlight tube. Look very closely
at the display to see if anything is visible in
the dark screen. Using a beam type source of
good lighting, such as a ashlight, look for any
ghost type image. If it appears that there is
something on the screen but very dark, the
problem may be with the backlight tube. On
the LG Philips, NEC and Sharp displays this
tube is eld replaceable. On the Samsung dis-
play it is not available and the display will have
to be replaced. There may be a sticker on the
display mounting plate. If there is, it will have
a part number that describes the type of dis-
play. If there is no sticker, you must take the
display apart to identify the display manufac-
turer.
• Verify that both the display cable and the in-
verter cable are rmly seated. These cables
both originate from the same connector on
the Q4. It may be necessary to remove the
video cable from the back of the display and
re-seat it to be sure it is connected properly.
Note: This is a small connector and caution
should be observed so that it is not damaged
due to excessive force.
• Refer to the Operator Interface section and
check that the display, display cable, and soft-
ware versions are matched correctly.
BATTERY FUNCTION AND REPLACEMENT
The Q4 board utilizes a battery to maintain correct
date and time for the purpose of stamping warnings
and shutdowns with the date and time that they oc-
curred. If the date and time are not being maintained
properly, it may indicate that the battery is not func-
tioning, and should be replaced. The battery may be
ordered through Baltimore Parts (P/N 333Q0001786) or
may be purchased at most electronic shops (manufac-
turers P/N CR-2032).
The battery is partially covered by the communications
daughter board, and is located directly beneath the
COM1 port (it may be necessary to unplug any con-
nector that is plugged into COM1 to fully access the
battery).
To replace the battery, ensure that the Control Power
switch has been turned OFF.
Locate the Battery Release Clip on the following draw-
ing:
Battery
Clip
Battery
Holder
Simply push the clip away from the battery, to release
the battery from the holder. Remove the battery, ob-
serving the orientation. Take a new battery and place
it into the holder in the same orientation as the old
battery (the side with the writing must be facing out).
Reinstall the COM1 plug (if removed), and return the
Control Power switch back to ON.
Once the Q4 has rebooted, the correct Date and Time
must be set.
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