QUANTUM
™
LX CONDENSER/VESSEL CONTROL PANEL
MAINTENANCE
090.560-M (MAY 2016)
Page 5
GENERAL INFORMATION
The components within the control panel can be inad-
vertently damaged by static electricity or mishandling.
Only qualied technicians should directly handle these
components.
1. DO NOT attempt to make corrections to the
power supply without shutting off the power to
the control panel. Accidental shorts can irrepa-
rably damage the processor boards or the dis-
play screen.
2. DO NOT HANDLE the panel boards when their
cables are disconnected without rst attaching a
properly grounded wrist ground strap to prevent
static electrical discharge from your body.
Most problems encountered with the microprocessor and
control circuits will be the result of a wiring fault, a blown
fuse, faulty I/O module or failure of a peripheral control
such as a solenoid coil or a pressure transducer. Faults in
the computer, while possible, are unlikely. If a fault devel-
ops in the computer, the probability is that all functions
will cease and the display screen will go blank. The control
system consists of an AC (high voltage) side, which can
be either 120 volts, or 230 volts, and a DC (low voltage)
side. The AC side actuates solenoids, relays, alarms, and
other electromechanical functions. The DC side operates
the computer and its various sensors.
When working within the panel, the AC high voltage
side, which can be either nominal 120 VAC or nominal
230 VAC, CAN CAUSE INJURY OR DEATH.
To troubleshoot the low-voltage side of the control cir-
cuits, it is necessary to have the following tools:
1. Accurate digital multimeter (capable of reading
to DC/AC, mA to the hundreds place)
2. Small wire stripper
3. Small screwdriver (with insulated shaft)
4. Small snip nose pliers
5. Wrist Grounding strap
6. Static free grounded work surface
Note: Proper panel voltage refers to the AC (high volt-
age) that has been supplied to the panel, which could be
either nominal 120 VAC or nominal 230 VAC.
WHAT TO DO BEFORE CALLING THE FACTORY
Many times when a suspected Quantum™ problem is
called in to the factory, not enough information is provid-
ed for the service personnel to assist in solving the prob-
lem. This is because the caller most likely is not aware of
the type of information that would be useful to factory
personnel in helping to identify and correct the problem.
An example of this is the statement that the Quantum™
is not booting (the main processor board is not starting).
Unfortunately, this description is usually vague and only
means that there is nothing on the display. A blank screen
could be the result of many different problems. The fol-
lowing is a list of possible reasons for no display:
• No power
• Loose or Faulty Display Cable or Inverter Cable
• Bad Display
• Bad Backlight Inverter (on CCFT style displays)
• Bad Backlight Fluorescent Tube (on CCFT style
displays)
• Wrong Combination of Display, Cable, Inverter
(on CCFT style displays) or Software
• Faulty CPU Board
Before calling the factory for assistance, review the in-
formation on the following pages and try to discover and
resolve your Quantum™ LX problem. The actual cause of
most problems is usually not with the Quantum™ board
itself, but with something external. However, on the rare
occasion that the problem has been identied as being the
Quantum™ board, use the following section as a guideline
for replacing it.
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